From Fedora Project Wiki

Revision as of 22:55, 12 February 2012 by Rombobeorn (talk | contribs) (→‎GNAT_arches: more discussion)


This is a draft proposal to make some changes to the Ada packaging guidelines. The changes are not yet ready for review by the Packaging Committee.

Source code in -devel packages

There is currently a rule that a -devel package must not contain all the source files of the library, only those that are necessary for compilation of code that uses the library. I think that this rule costs more than it's worth. It's very difficult for a reviewer to know which files are needed and which ones aren't. The GNAT tools know of course, and will install only the needed files, but not all Ada projects use the GNAT tools to do the installation. Manually keeping track of which body files are needed for recompilation can be error-prone even for upstream developers, so Make-based build systems are likely to just install the complete sources, and it would be a lot of work for a packager to rework makefiles to make them follow the rule.

The code is free so we have no reason to hide it, and disk space won't be an issue on developers' workstations or on build servers. Thus I think the rule should be removed. We could keep it as a "should not", but then I expect that the guideline would be followed only when the upstream buildsystem follows it. Such a guideline wouldn't make any difference, so it's better to remove it.

Macros with compiler and linker flags

When RPMbuild was packaged it turned out that passing the same command line parameters to RPMbuild as to Gnatmake wasn't optimal, so we replaced GNAT_optflags with two different macros: Gnatmake_optflags and GPRbuild_optflags. It might also happen that some package's build system invokes the underlying GNAT tools directly for some reason, without using Gnatmake or GPRbuild, in which case the packager may need to add some parameters for those tools.

The sentences "The RPM macro %{GNAT_optflags} MUST be used in the compilation. It contains the standard Fedora optimization flags adapted to GNAT." should be replaced with the following paragraph:

The RPM macros Gnatmake_optflags and GPRbuild_optflags expand to Fedora's standard compiler and linker flags adapted for Gnatmake and GPRbuild respectively. These macros MUST be used in packages that are built with Gnatmake or GPRbuild. In case the package's build system invokes the underlying GNAT tools without using Gnatmake or GPRbuild, then the appropriate macro for each tool MUST be used. If for example Gnatlink is invoked directly, then the expansion of Gnatlink_flags shall be passed to it.


Maintainers of some secondary architectures want to prevent build attempts that would always fail because they haven't bootstrapped GNAT on their architectures. A macro has been defined to help with this. I propose to add the following paragraph to the Compilation section:

The macro GNAT_arches expands to a list of architectures where GNAT packages are available in Fedora. When there is a need to prevent attempts to build an Ada package on secondary architectures where GNAT has not been bootstrapped, this MUST be done with "ExclusiveArch: %{GNAT_arches}".


Although the current Ada guidelines were approved on the 23rd of February 2011, the page is still in the Packaging guidelines drafts category. If I understand the process right it should be moved to the Packaging guidelines category.