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meson/docs/markdown/snippets/static_link.md

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Improved support for static libraries

Static libraries had numerous shortcomings in the past, especially when using uninstalled static libraries. This release brings many internal changes in the way they are handled, including:

  • link_whole: of static libraries. In the example below, lib2 used to miss symbols from lib1 and was unusable.
lib1 = static_library(sources)
lib2 = static_library(other_sources, link_whole : lib1, install : true)
  • link_with: of a static library with an uninstalled static library. In the example below, lib2 now implicitly promote link_with: to link_whole: because the installed lib2 would oterhwise be unusable.
lib1 = static_library(sources, install : false)
lib2 = static_library(sources, link_with : lib1, install : true)
  • pkg-config generator do not include uninstalled static libraries. In the example below, the generated .pc file used to be unusable because it contained Libs.private: -llib1 and lib1.a is not installed. lib1 is now ommitted from the .pc file because the link_with: has been promoted to link_whole: (see above) and thus lib1 is not needed to use lib2.
lib1 = static_library(sources, install : false)
lib2 = both_libraries(sources, link_with : lib1, install : true)
pkg.generate(lib2)

Many projects have been using extract_all_objects() to work around those issues, and hopefully those hacks could now be removed. Since this is a pretty large change, please double check if your static libraries behave correctly, and report any regression.