2.9.10. Attributes
A project (and its packages) may have attributes that define the project’s properties. Some attributes have values that are strings; others have values that are string lists.
attribute_declaration ::=
simple_attribute_declaration | indexed_attribute_declaration
simple_attribute_declaration ::= 'for' attribute_designator 'use' expression ;
indexed_attribute_declaration ::=
'for' *<indexed_attribute_>*simple_name ( string_literal) 'use' expression ;
attribute_designator ::=
<simple_attribute_>simple_name
| <indexed_attribute_>simple_name ( string_literal )
There are two categories of attributes: simple attributes and indexed attributes. Each simple attribute has a default value: the empty string (for string attributes) and the empty list (for string list attributes). An attribute declaration defines a new value for an attribute, and overrides the previous value. The syntax of a simple attribute declaration is similar to that of an attribute definition clause in Ada.
Some attributes are indexed. These attributes are mappings whose domain is a set of strings. They are declared one association at a time, by specifying a point in the domain and the corresponding image of the attribute. Like untyped variables and simple attributes, indexed attributes may be declared several times. Each declaration supplies a new value for the attribute, and replaces the previous setting.
Here are some examples of attribute declarations:
-- simple attributes for Object_Dir use "objects"; for Source_Dirs use ("units", "test/drivers"); -- indexed attributes for Body ("main") use "Main.ada"; for Switches ("main.ada") use ("-v", "-gnatv"); for Switches ("main.ada") use Builder'Switches ("main.ada") & "-g"; -- indexed attributes copy (from package Builder in project Default) -- The package name must always be specified, even if it is the current -- package. for Default_Switches use Default.Builder'Default_Switches;
When an attribute is defined in the configuration project but not in the user project, it is inherited in the user project.
When a single string attribute is defined in both the configuration project and the user project, its value in the user project is as declared; the value in the configuration project does not matter.
For string list attributes, there are two cases. Some of these attributes are configuration concatenable. For these attributes, when they are declared in both the configuration project and the user project, the final value is the concatenation of the value in the configuration project with the value in the user project. The configuration concatenable attributes are indicated in the list below.
Attributes references may appear anywhere in expressions, and are used to retrieve the value previously assigned to the attribute. If an attribute has not been set in a given package or project, its value defaults to the empty string or the empty list, with some exceptions.
attribute_reference ::=
attribute_prefix ' <simple_attribute>_simple_name [ (string_literal) ]
attribute_prefix ::= 'project'
| <project_>simple_name
| package_identifier
| <project_>simple_name . package_identifier
Here are some examples:
project'Object_Dir Naming'Dot_Replacement Imported_Project'Source_Dirs Imported_Project.Naming'Casing Builder'Default_Switches ("Ada")
The exceptions to the empty defaults are:
Object_Dir: default is"."Exec_Dir: default is'Object_Dir, that is, the value of attributeObject_Dirin the same project, declared or defaultedSource_Dirs: default is(".")
The prefix of an attribute may be:
projectfor an attribute of the current projectThe name of an existing package of the current project
The name of an imported project
The name of a parent project that is extended by the current project
An expanded name whose prefix is imported/base/parent project name, and whose selector is a package name
In the following sections, all predefined attributes are succinctly described, first the project level attributes (that is, those attributes that are not in a package), then the attributes in the different packages.
It is possible for different tools to dynamically create new packages with attributes, or new attributes in predefined packages. These attributes are not documented here.
The attributes under Configuration headings are usually found only in configuration project files.
The characteristics of each attribute are indicated as follows:
Type of value
The value of an attribute may be a single string, indicated by the word “single value”, a string list, indicated by the word “list value” or a string set (list where the elements are unique), indicated by the word “set value”. In the case of a set, it is also indicated if the elements are considered case sensitive or not.
Read-only
When the attribute is read-only – that is when a declaration for the attribute is forbidden – this is indicated by the “read-only”.
Optional index
If an optional index is allowed in the value of the attribute (both single and list), this is indicated by the words “others index allowed”. Such definition is used when no other index match.
Indexed attribute
An indexed attribute is indicated by the word “indexed by …” followed by the kind of index:
language: the index is a language, case insensitive
file name: the index is a simple file name (so without any directory or subdirectory indication).
source glob: the index is the simple file name of a source file, or a glob pattern that matches simple file name of several source files. The case sensitivity depends on the host.
source glob or language: the index is either a source glob or a language (see above the two kind of index).
unit: the index is an Ada unit, case insensitive
string: the index is a generic case sensitive string
external reference: the index is an external reference
Configuration concatenable
For a string list attribute, the final value if the attribute is declared in both the configuration project and the user project is the concatenation of the two value, configuration then user.
Inheritance
By default, top-level attribute values are inherited from extended projects if any. If not, it is indicated:
not inherited from extended when the value is not inherited
concatenated from extended when the final value is the concatenation of the list inherited from the extended project and the project’s own definition.
2.9.10.1. Project Level Attributes
Configuration - Archives
Archive_Builder: list value, not inherited from extended project
Warning
Empty value is not supported yet in non GNATcoll.Project-based tools
Value is the name of the application to be used to create a static library (archive), followed by the options to be used. If an empty value is provided, object files used as a recipe for the archive are copied to the library directory instead.
Archive_Builder_Append_Option: list value, not inherited from extended project
Value is the list of options to be used when invoking the archive builder to add project files into an archive.
Archive_Indexer: list value, not inherited from extended project
Value is the name of the archive indexer, followed by the required options.
Archive_Prefix: single value, not inherited from extended project
Value is the prefix of archives. When not declared, the prefix is ‘lib’.
Archive_Suffix: single value, not inherited from extended project
Value is the extension of archives. When not declared, the extension is ‘.a’.
Library_Partial_Linker: list value, not inherited from extended project
Value is the name of the partial linker executable, followed by the required options. If set to an empty list, partial linking is not performed.
Directories
Create_Missing_Dirs: single value
Indicates if the missing object, library and executable directories should be created automatically by the project-aware tool. Taken into account only in the main project. Only authorized case-insensitive values are ‘true’ and ‘false’.
Exec_Dir: single value, not inherited from extended project
Indicates the exec directory for the project, that is the directory where the executables are.
Ignore_Source_Sub_Dirs: list value, not inherited from extended project
Value is a list of simple names or patterns for subdirectories that are removed from the list of source directories, including their subdirectories.
Inherit_Source_Path: list value, indexed by a language
Index is a language name. Value is a list of language names. Indicates that in the source search path of the index language the source directories of the languages in the list should be included.
Object_Dir: single value, not inherited from extended project
Indicates the object directory for the project.
Source_Dirs: list value, not inherited from extended project
The list of source directories of the project.
Configuration - General
Config_Prj_File: single value
The main configuration project file.
Default_Language: single value, not inherited from extended project
Value is the case-insensitive name of the language of a project when attribute Languages is not specified.
Object_Generated: single value, indexed by a language
Index is a language name. Indicates if invoking the compiler for a language produces an object file. Only authorized case-insensitive values are ‘false’ and ‘true’ (the default).
Objects_Linked: single value, indexed by a language
Index is a language name. Indicates if the object files created by the compiler for a language need to be linked in the executable. Only authorized case-insensitive values are ‘false’ and ‘true’ (the default).
Required_Toolchain_Version: single value, indexed by a language
Index is a language name. Specify the value expected for the Toolchain_Version attribute for this language, typically provided by an auto-generated configuration project. If Required_Toolchain_Version and Toolchain_Version do not match, the project processing aborts with an error.
Run_Path_Option: list value, not inherited from extended project
Value is the list of switches to be used when specifying the run path option in an executable.
Run_Path_Origin: single value, not inherited from extended project
Value is the string that may replace the path name of the executable directory in the run path options.
Runtime: single value, indexed by a language
Index is a language name. Indicates the runtime directory that is to be used when using the compiler of the language. Taken into account only in the main project, or its extended projects if any. Note that when the runtime is specified for a language on the command line (usually with a switch
--RTS), the value of attribute reference ‘Runtime for this language is the one specified on the command line.
Runtime_Dir: single value, indexed by a language
Index is a language name. Value is the path name of the runtime directory for the language.
Runtime_Library_Dir: single value, indexed by a language, not inherited from extended project
Index is a language name. Value is the path name of the directory where the runtime libraries are located. This attribute is obsolete.
Runtime_Source_Dir: single value, indexed by a language
Index is a language name. Value is the path name of the directory where the sources of runtime libraries are located. This attribute is obsolete.
Runtime_Source_Dirs: list value, indexed by a language
Index is a language name. Value is the path names of the directories where the sources of runtime libraries are located. This attribute is not normally declared.
Separate_Run_Path_Options: single value, not inherited from extended project
Indicates if there may be several run path options specified when linking an executable. Only authorized case-insensitive values are ‘true’ or ‘false’ (the default).
Target: single value
Value is the name of the target platform. Taken into account only in the main project. Note that when the target is specified on the command line (usually with a switch
--target=), the value of attribute reference ‘Target is the one specified on the command line.
Toolchain_Version: single value, indexed by a language
Index is a language name. Specify the version of a toolchain for a language.
Toolchain_Name: single value, indexed by a language
Index is a language name. Indicates the toolchain name that is to be used when using the compiler of the language. Taken into account only in the main project, or its extended projects if any.
Toolchain_Description: single value, indexed by a language
Obsolescent. No longer used.
Source Files
Excluded_Source_Files: list value, not inherited from extended project
Value is a list of simple file names that are not sources of the project. Allows to remove sources that are inherited or found in the source directories and that match the naming scheme.
Excluded_Source_List_File: single value, not inherited from extended project
Value is a text file name that contains a list of file simple names that are not sources of the project.
Interfaces: set value, case-sensitive
Value is a list of file names that constitutes the interfaces of the project.
Locally_Removed_Files: list value, not inherited from extended project
Obsolescent. Equivalent to Excluded_Source_Files.
Source_Files: list value, not inherited from extended project
Value is a list of source file simple names.
Source_List_File: single value, not inherited from extended project
Value is a text file name that contains a list of source file simple names, one on each line.
Aggregate Projects
External: single value, indexed by an external reference
Index is the name of an external reference. Value is the value of the external reference to be used when parsing the aggregated projects.
Project_Files: list value, not inherited from extended project
Value is the list of aggregated projects.
Project_Path: list value, not inherited from extended project
Value is a list of directories that are added to the project search path when looking for the aggregated projects.
General
Externally_Built: single value, not inherited from extended project
Indicates if the project is externally built. Only case-insensitive values allowed are ‘true’ and ‘false’, the default.
Languages: set value, case-insensitive
The list of languages of the sources of the project.
Main: list value
The list of main sources for the executables.
Name: single value, read-only, not inherited from extended project
The name of the project.
Project_Dir: single value, read-only, not inherited from extended project
The path name of the project directory.
Roots: list value, indexed by a source glob or language
The index is the file name of an executable source. Indicates the list of units from the main project that need to be bound and linked with their closures with the executable. The index is either a file name, a language name or ‘*’. The roots for an executable source are those in Roots with an index that is the executable source file name, if declared. Otherwise, they are those in Roots with an index that is the language name of the executable source, if present. Otherwise, they are those in Roots (‘*’), if declared. If none of these three possibilities are declared, then there are no roots for the executable source.
Warning_Message: single value
Causes gprbuild to emit a user-defined warning message.
Libraries
Leading_Library_Options: list value, configuration concatenable, not inherited from extended project
Value is a list of options that are to be used at the beginning of the command line when linking a shared library.
Library_Auto_Init: single value, not inherited from extended project
Indicates if a Stand-Alone Library is auto-initialized. Only authorized case-insensitive values are ‘true’ and ‘false’. Default to Library_Auto_Init_Supported value. Can not be set to true if Library_Auto_Init_Supported is false.
Library_Dir: single value
Value is the name of the library directory. This attribute needs to be declared for each library project.
Library_Encapsulated_Options: list value, configuration concatenable, not inherited from extended project
Value is a list of options that need to be used when linking an encapsulated Stand-Alone Library.
Library_Encapsulated_Supported: single value, not inherited from extended project
Indicates if encapsulated Stand-Alone Libraries are supported. Only authorized case-insensitive values are ‘true’ and ‘false’ (the default).
Library_Interface: set value, case-insensitive
Value is the list of unit names that constitutes the interfaces of a Stand-Alone Library project.
Library_Kind: single value, not inherited from extended project
Specifies the kind of library: static library (archive) or shared library. Case-insensitive values must be one of ‘static’ for archives (the default), ‘static-pic’ for archives of Position Independent Code, or ‘dynamic’ or ‘relocatable’ for shared libraries.
Library_Name: single value
Value is the name of the library. This attribute needs to be declared or inherited for each library project.
Library_Options: list value, configuration concatenable, not inherited from extended project
Value is a list of options that are to be used when linking a shared library.
Library_Reference_Symbol_File: single value, not inherited from extended project
Value is the name of the reference symbol file.
Library_Rpath_Options: list value, indexed by a language, configuration concatenable
Index is a language name. Value is a list of options for an invocation of the compiler of the language. This invocation is done for a shared library project with sources of the language. The output of the invocation is the path name of a shared library file. The directory name is to be put in the run path option switch when linking the shared library for the project.
Library_Src_Dir: single value, not inherited from extended project
Value is the name of the directory where copies of the sources of the interfaces of a Stand-Alone Library are to be copied.
Library_Standalone: single value, not inherited from extended project
Specifies if a Stand-Alone Library (SAL) is encapsulated or not. Only authorized case-insensitive values are ‘standard’ for non encapsulated SALs, ‘encapsulated’ for encapsulated SALs or ‘no’ for non SAL library project.
Library_Symbol_File: single value, not inherited from extended project
Value is the name of the library symbol file.
Library_Symbol_Policy: single value, not inherited from extended project
Indicates the symbol policy kind. Only authorized case-insensitive values are ‘restricted’, ‘unrestricted’.
Library_Version: single value, not inherited from extended project
Value is the name of the library file.
For more details see the attribute semantics.
Configuration - Shared Libraries
Library_Auto_Init_Supported: single value, not inherited from extended project
Indicates if auto-initialization of Stand-Alone Libraries is supported. Only authorized case-insensitive values are ‘true’ and ‘false’ (the default).
Library_Install_Name_Option: single value, not inherited from extended project
Value is the name of the option that needs to be used, concatenated with the path name of the library file, when linking a shared library.
Library_Major_Minor_Id_Supported: single value, not inherited from extended project
Indicates if major and minor ids for shared library names are supported on the platform. Only authorized case-insensitive values are ‘true’ and ‘false’ (the default).
Library_Version_Switches: list value, configuration concatenable, not inherited from extended project
Value is the list of switches to specify a internal name for a shared library.
Shared_Library_Minimum_Switches: list value, not inherited from extended project
Value is the list of required switches when linking a shared library.
Shared_Library_Prefix: single value, not inherited from extended project
Value is the prefix in the name of shared library files. When not declared, the prefix is ‘lib’.
Shared_Library_Suffix: single value, not inherited from extended project
Value is the extension of the name of shared library files. When not declared, the extension is ‘.so’.
Symbolic_Link_Supported: single value, not inherited from extended project
Indicates if symbolic links are supported on the platform. Only authorized case-insensitive values are ‘true’ and ‘false’ (the default).
Configuration - Libraries
Library_Builder: single value, not inherited from extended project
Value is the path name of the application that is to be used to build libraries. Usually the path name of ‘gprlib’.
Library_Support: single value, not inherited from extended project
Indicates the level of support of libraries. Only authorized case-insensitive values are ‘static_only’, ‘full’ or ‘none’ (the default).
Linker_Lib_Dir_Option: single value, not inherited from extended project
Option used to add a library directory to the linker search path.
2.9.10.2. Package Binder Attributes
General
Default_Switches: list value, indexed by a source glob or language, “others” index allowed, configuration concatenable
Index is a language name. Value is the list of switches to be used when binding code of the language, if there is no applicable attribute Switches.
Switches: list value, indexed by a source glob or language, “others” index allowed, configuration concatenable
Index is either a language name or a source file name. Value is the list of switches to be used when binding code. Index is either the source file name of the executable to be bound or the language name of the code to be bound.
Configuration - Binding
Driver: single value, indexed by a language
Index is a language name. Value is the name of the application to be used when binding code of the language.
Objects_Path: single value, indexed by a language
Index is a language name. Value is the name of the environment variable that contains the path for the object directories.
Prefix: single value, indexed by a language
Index is a language name. Value is a prefix to be used for the binder exchange file name for the language. Used to have different binder exchange file names when binding different languages.
Required_Switches: list value, indexed by a language, configuration concatenable
Index is a language name. Value is the list of the required switches to be used when binding code of the language.
2.9.10.3. Package Builder Attributes
Default_Switches: list value, indexed by a source glob or language, “others” index allowed, configuration concatenable
Index is a language name. Value is the list of builder switches to be used when building an executable of the language, if there is no applicable attribute Switches.
Switches: list value, indexed by a source glob or language, “others” index allowed, configuration concatenable
Index is either a language name or a source file name. Value is the list of builder switches to be used when building an executable. Index is either the source file name of the executable to be built or its language name.
Executable: single value, indexed by a file name
Index is an executable source file name. Value is the simple file name of the executable to be built.
Executable_Suffix: single value
Value is the extension of the file name of executables. The actual default value for the extension depends on the host:
.exeon windows, else an empty string.
Global_Compilation_Switches: list value, indexed by a language, “others” index allowed, configuration concatenable
Index is a language name. Value is the list of compilation switches to be used when building an executable. Index is either the source file name of the executable to be built or its language name.
Global_Config_File: single value, indexed by a language
Index is a language name. Value is the file name of a configuration file that is specified to the compiler when compiling any source of the language in the project tree.
Global_Configuration_Pragmas: single value
Value is the file name of a configuration pragmas file that is specified to the Ada compiler when compiling any Ada source in the project tree.
2.9.10.4. Package Clean Attributes
Switches: list value, configuration concatenable
Taken into account only in the main project. Value is a list of switches to be used by the cleaning application.
Artifacts_In_Exec_Dir: list value
Value is list of file names expressed as regular expressions that are to be deleted by gprclean in the exec directory of the main project.
Artifacts_In_Object_Dir: list value
Value is a list of file names expressed as regular expressions that are to be deleted by gprclean in the object directory of the project.
Object_Artifact_Extensions: list value, indexed by a language
Index is a language names. Value is the list of extensions for file names derived from source file names that need to be cleaned in the object directory of the project.
Source_Artifact_Extensions: list value, indexed by a language
Index is a language names. Value is the list of extensions for file names derived from object file names that need to be cleaned in the object directory of the project.
2.9.10.5. Package Compiler Attributes
General
Default_Switches: list value, indexed by a source glob or language, “others” index allowed, configuration concatenable
Index is a language name. Value is a list of switches to be used when invoking the compiler for the language for a source of the project, if there is no applicable attribute Switches.
Switches: list value, indexed by a source glob or language, “others” index allowed, configuration concatenable
Index is a source file name or a language name. Value is the list of switches to be used when invoking the compiler for the source or for its language.
Local_Config_File: single value, indexed by a language
Index is a language name. Value is the file name of a configuration file that is specified to the compiler when compiling any source of the language in the project.
Local_Configuration_Pragmas: single value
Value is the file name of a configuration pragmas file that is specified to the Ada compiler when compiling any Ada source in the project.
Configuration - Compiling
Driver: single value, indexed by a language
Index is a language name. Value is the name of the executable for the compiler of the language.
Required_Switches: list value, indexed by a language, configuration concatenable
Equivalent to attribute Leading_Required_Switches.
Dependency_Kind: single value, indexed by a language
Index is a language name. Indicates how the dependencies are handled for the language. Only authorized case-insensitive values are ‘makefile’, ‘ali_file’, ‘ali_closure’ or ‘none’ (the default).
Language_Kind: single value, indexed by a language
Index is a language name. Indicates the kind of the language, either file based or unit based. Only authorized case-insensitive values are ‘unit_based’ and ‘file_based’ (the default).
Leading_Required_Switches: list value, indexed by a language, configuration concatenable
Index is a language name. Value is the list of the minimum switches to be used at the beginning of the command line when invoking the compiler for the language.
Multi_Unit_Object_Separator: single value, indexed by a language
Index is a language name. Value is the string to be used in the object file name before the index of the unit, when compiling a unit in a multi unit source of the language.
Multi_Unit_Switches: list value, indexed by a language
Index is a language name. Value is the list of switches to be used to compile a unit in a multi unit source of the language. The index of the unit in the source is concatenated with the last switches in the list.
Object_File_Suffix: single value, indexed by a language
Index is a language name. Value is the extension of the object files created by the compiler of the language. When not specified, the extension is the default one for the platform.
Object_File_Switches: list value, indexed by a language, configuration concatenable
Index is a language name. Value is the list of switches to be used by the compiler of the language to specify the path name of the object file. When not specified, the switch used is ‘-o’.
Source_File_Switches: list value, indexed by a language, configuration concatenable
Index is a language name. Value is a list of switches to be used just before the path name of the source to compile when invoking the compiler for a source of the language.
Trailing_Required_Switches: list value, indexed by a language, configuration concatenable
Index is a language name. Value is the list of the minimum switches to be used at the end of the command line when invoking the compiler for the language.
Configuration - Config Files
Config_Body_File_Name: single value, indexed by a language
Index is a language name. Value is the template to be used to indicate a configuration specific to a body of the language in a configuration file.
Config_Body_File_Name_Index: single value, indexed by a language
Index is a language name. Value is the template to be used to indicate a configuration specific to the body a unit in a multi unit source of the language in a configuration file.
Config_Body_File_Name_Pattern: single value, indexed by a language
Index is a language name. Value is the template to be used to indicate a configuration for all bodies of the languages in a configuration file.
Config_File_Switches: list value, indexed by a language, configuration concatenable
Index is a language name. Value is the list of switches to specify to the compiler of the language a configuration file.
Config_File_Unique: single value, indexed by a language
Index is a language name. Indicates if there should be only one configuration file specified to the compiler of the language. Only authorized case-insensitive values are ‘true’ and ‘false’ (the default).
Config_Spec_File_Name: single value, indexed by a language
Index is a language name. Value is the template to be used to indicate a configuration specific to a spec of the language in a configuration file.
Config_Spec_File_Name_Index: single value, indexed by a language
Index is a language name. Value is the template to be used to indicate a configuration specific to the spec a unit in a multi unit source of the language in a configuration file.
Config_Spec_File_Name_Pattern: single value, indexed by a language
Index is a language name. Value is the template to be used to indicate a configuration for all specs of the languages in a configuration file.
Configuration - Dependencies
Dependency_Driver: list value, indexed by a language
Index is a language name. Value is the name of the executable to be used to create the dependency file for a source of the language, followed by the required switches.
Dependency_Switches: list value, indexed by a language, configuration concatenable
Index is a language name. Value is the list of switches to be used to specify to the compiler the dependency file when the dependency kind of the language is file based, and when Dependency_Driver is not specified for the language.
Configuration - Search Paths
Include_Path: single value, indexed by a language
Index is a language name. Value is the name of an environment variable that contains the path of all the directories that the compiler of the language may search for sources.
Include_Path_File: single value, indexed by a language
Index is a language name. Value is the name of an environment variable the value of which is the path name of a text file that contains the directories that the compiler of the language may search for sources.
Include_Switches: list value, indexed by a language, configuration concatenable
Index is a language name. Value is the list of switches to specify to the compiler of the language to indicate a directory to look for sources.
Object_Path_Switches: list value, indexed by a language, configuration concatenable
Index is a language name. Value is the list of switches to specify to the compiler of the language the name of a text file that contains the list of object directories. When this attribute is not declared, the text file is not created.
Configuration - Mapping Files
Mapping_Body_Suffix: single value, indexed by a language
Index is a language name. Value is the suffix to be used in a mapping file to indicate that the source is a body.
Mapping_File_Switches: list value, indexed by a language, configuration concatenable
Index is a language name. Value is the list of switches to be used to specify a mapping file when invoking the compiler for a source of the language.
Mapping_Spec_Suffix: single value, indexed by a language
Index is a language name. Value is the suffix to be used in a mapping file to indicate that the source is a spec.
Configuration - Response Files
Max_Command_Line_Length: single value
Value is the maximum number of character in the command line when invoking a compiler that supports response files.
Response_File_Format: single value, indexed by a language
Indicates the kind of response file to create when the length of the compiling command line is too large. The index is the name of the language for the compiler. Only authorized case-insensitive values are ‘none’, ‘gnu’, ‘object_list’, ‘gcc_gnu’, ‘gcc_option_list’ and ‘gcc_object_list’.
Response_File_Switches: list value, indexed by a language, configuration concatenable
Value is the list of switches to specify a response file for a compiler. The index is the name of the language for the compiler.
2.9.10.6. Package Gnatls Attributes
Switches: list value
Taken into account only in the main project. Value is a list of switches to be used when invoking gnatls.
2.9.10.7. Package Install Attributes
Prefix: single value
Value is the install destination directory. If the value is a relative path, it is taken as relative to the global prefix directory. That is, either the value passed to –prefix option or the default installation prefix.
Active: single value
Indicates that the project is to be installed or not. Case-insensitive value ‘false’ means that the project is not to be installed, all other values mean that the project is to be installed.
Artifacts: list value, indexed by a file name
An indexed attribute to declare a set of files not part of the sources to be installed. The array index is the directory where the file is to be installed. If a relative directory then Prefix (see below) is prepended. Note also that if the same file name occurs multiple time in the attribute list, the last one will be the one installed. If an artifact is not found a warning is displayed.
Exec_Subdir: single value
Value is the executables directory or subdirectory of Prefix.
Install_Name: single value
Specify the name to use for recording the installation. The default is the project name without the extension.
Install_Project: single value
Indicates that a project is to be generated and installed. The value is either ‘true’ to ‘false’. Default is ‘true’.
Lib_Subdir: single value
Value is library directory or subdirectory of Prefix.
Mode: single value
Value is the installation mode, it is either ‘dev’ (default) or ‘usage’.
Project_Subdir: single value
Value is the project directory or subdirectory of Prefix.
Required_Artifacts: list value, indexed by a file name
As above, but artifacts must be present or an error is reported.
Side_Debug: single value
Indicates that the project’s executable and shared libraries are to be stripped of the debug symbols. Those debug symbols are written into a side file named after the original file with the ‘.debug’ extension added. Case-insensitive value ‘false’ (default) disables this feature. Set it to ‘true’ to activate.
Sources_Subdir: single value
Value is the sources directory or subdirectory of Prefix.
2.9.10.8. Package Linker Attributes
General
Default_Switches: list value, indexed by a source glob or language, “others” index allowed, configuration concatenable
Warning
Index “others” is not supported yet in gprbuild or GNATcoll.Projects-based tools
Index is a language name. Value is a list of switches for the linker when linking an executable for a main source of the language, when there is no applicable Switches.
Required_Switches: list value, configuration concatenable
Value is a list of switches that are required when invoking the linker to link an executable.
Switches: list value, indexed by a source glob or language, “others” index allowed, configuration concatenable
Index is a source file name or a language name. Value is the list of switches to be used when invoking the linker to build an executable for the source or for its language.
Group_End_Switch: single value
Value is the switch to use to end a link group, a group of libraries to be linked with recursively
Group_Start_Switch: single value
Value is the switch to use to start a link group, a group of libraries to be linked with recursively
Leading_Switches: list value, indexed by a source glob or language, “others” index allowed, configuration concatenable
Index is a source file name or a language name. Value is the list of switches to be used at the beginning of the command line when invoking the linker to build an executable for the source or for its language.
Linker_Options: list value, configuration concatenable
This attribute specifies a list of additional switches to be given to the linker when linking an executable. It is ignored when defined in the main project and taken into account in all other projects that are imported directly or indirectly. These switches complement the Linker’Switches defined in the main project. This is useful when a particular subsystem depends on an external library: adding this dependency as a Linker_Options in the project of the subsystem is more convenient than adding it to all the Linker’Switches of the main projects that depend upon this subsystem.
Trailing_Switches: list value, indexed by a source glob or language, “others” index allowed, configuration concatenable
Index is a source file name or a language name. Value is the list of switches to be used at the end of the command line when invoking the linker to build an executable for the source or for its language. These switches may override the Required_Switches.
Unconditional_Linking: single value, indexed by a language
When set for a language, this instructs the link phase to always explicitly link with the produced objects
Configuration - Linking
Driver: single value
Value is the name of the linker executable.
Configuration - Response Files
Max_Command_Line_Length: single value
Value is the maximum number of character in the command line when invoking the linker to link an executable.
Response_File_Format: single value
Indicates the kind of response file to create when the length of the linking command line is too large. Only authorized case-insensitive values are ‘none’, ‘gnu’, ‘object_list’, ‘gcc_gnu’, ‘gcc_option_list’ and ‘gcc_object_list’.
Response_File_Switches: list value, configuration concatenable
Value is the list of switches to specify a response file to the linker.
2.9.10.9. Package Naming Attributes
Body: single value, indexed by a unit
Index is a unit name. Value is the file name of the body of the unit.
Body_Suffix: single value, indexed by a language
Warning
Also has case-insensitive values in gprbuild and GNATcoll.Project-based tools
Index is a language name. Value is the extension of file names for bodies of the language.
Casing: single value
Indicates the casing of sources of the Ada language. Only authorized case-insensitive values are ‘lowercase’, ‘uppercase’ and ‘mixedcase’.
Dot_Replacement: single value
Value is the string that replace the dot of unit names in the source file names of the Ada language.
Implementation: single value, indexed by a unit
Equivalent to attribute Body.
Implementation_Exceptions: list value, indexed by a language
Index is a language name. Value is a list of bodies for the language that do not necessarily follow the naming scheme for the language and that may or may not be found in the source directories of the project.
Implementation_Suffix: single value, indexed by a language
Warning
Also has case-insensitive values in gprbuild and GNATcoll.Project-based tools
Equivalent to attribute Body_Suffix.
Separate_Suffix: single value
Value is the extension of file names for subunits of Ada.
Spec: single value, indexed by a unit
Index is a unit name. Value is the file name of the spec of the unit.
Spec_Suffix: single value, indexed by a language
Warning
Also has case-insensitive values in gprbuild and GNATcoll.Project-based tools
Index is a language name. Value is the extension of file names for specs of the language.
Specification: single value, indexed by a unit
Equivalent to attribute Spec.
Specification_Exceptions: list value, indexed by a language
Index is a language name. Value is a list of specs for the language that do not necessarily follow the naming scheme for the language and that may or may not be found in the source directories of the project.
Specification_Suffix: single value, indexed by a language
Warning
Also has case-insensitive values in gprbuild and GNATcoll.Project-based tools
Equivalent to attribute Spec_Suffix.