meson

The Meson Build System http://mesonbuild.com/

Ting-Wei Lan 04e08f5a1f PkgConfigDependency: Sort -L flags according to PKG_CONFIG_PATH When there is more than one path in PKG_CONFIG_PATH. It is almost always preferred to find things in the order specified by PKG_CONFIG_PATH instead of assuming pkg-config returns flags in a meaningful order. For example: /usr/local/lib/libgtk-3.so.0 /usr/local/lib/pkgconfig/gtk+-3.0.pc /usr/local/lib/libcanberra-gtk3.so /usr/local/lib/pkgconfig/libcanberra-gtk3.pc /home/mesonuser/.local/lib/libgtk-3.so.0 /home/mesonuser/.local/lib/pkgconfig/gtk+-3.0.pc PKG_CONFIG_PATH="/home/mesonuser/.local/lib/pkgconfig:/usr/local/lib/pkgconfig" libcanberra-gtk3 is a library which depends on gtk+-3.0. The dependency is mentioned in the .pc file with 'Requires', so flags from gtk+-3.0 are used in both dynamic and static linking. Assume the user wants to compile an application which needs both libcanberra-gtk3 and gtk+-3.0. The application depends on features added in the latest version of gtk+-3.0, which can be found in the home directory of the user but not in /usr/local. When meson asks pkg-config for linker flags of libcanberra-gtk3, pkg-config picks /usr/local/lib/pkgconfig/libcanberra-gtk3.pc and /home/mesonuser/.local/lib/pkgconfig/gtk+-3.0.pc. Since these two libraries come from different prefixes, there will be two -L arguments in the output of pkg-config. If -L/usr/local/lib is put before -L/home/mesonuser/.local/lib, meson will find both libraries in /usr/local/lib instead of picking libgtk-3.so.0 from the home directory. This can result in linking failure such as undefined references error when meson decides to put linker arguments of libcanberra-gtk3 before linker arguments of gtk+-3.0. When both /usr/local/lib/libgtk-3.so.0 and /home/mesonuser/.local/lib/libgtk-3.so.0 are present on the command line, the linker chooses the first one and ignores the second one. If the application needs new symbols that are only available in the second one, the linker will throw an error because of missing symbols. To resolve the issue, we should reorder -L flags according to PKG_CONFIG_PATH ourselves before using it to find the full path of library files. This makes sure that we always follow the preferences of users, without depending on the unreliable part of pkg-config output. Fixes https://github.com/mesonbuild/meson/issues/4271.		5 years ago
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data	cmake: add project language to cmakelists.txt	5 years ago
__init__.py	deps: add scalapack	5 years ago
base.py	PkgConfigDependency: Sort -L flags according to PKG_CONFIG_PATH	5 years ago
boost.py	Adapting Boost Python library detection to Boost >= 1.67. Closes #4288 .	5 years ago
coarrays.py	deps: add pkg-config to coarray with CMake fallback	5 years ago
cuda.py	lgtm: fix Multiple calls to __init__	5 years ago
dev.py	lgtm: fix Multiple calls to __init__	5 years ago
hdf5.py	Fail gracefully detecting hdf5 if pkg-config is not available.	5 years ago
misc.py	cmake: add project language to cmakelists.txt	5 years ago
mpi.py	dep: MPI make work for intel-cl and improve robustness	5 years ago
platform.py	Non-required appleframework deps should not be an error. Closes #5295 .	6 years ago
scalapack.py	scalapack: allow specifying find method	5 years ago
ui.py	lgtm: Fix redundant code	5 years ago