meson install removes needed RPATH entries specified by pkg-config

[alanc]

Describe the bug When building mesa for Solaris with meson-0.63.3 a number of libraries which linked to /usr/lib/xorg/libdrm.so.1 had the /usr/lib/xorg path removed from RPATH by "meson install", leaving the libraries unable to be used by programs:

$ /usr/bin/gtk-demo
ld.so.1: gtk-demo: fatal: libdrm.so.2: open failed: No such file or directory

This happens despite pkg-config listing the needed path correctly:

% pkg-config --libs libdrm
-L/usr/lib/xorg -R/usr/lib/xorg -ldrm

To Reproduce Build a project with dependencies on a library in a non-default path for which pkg-config correctly provides -R flags to link with.

Expected behavior "meson install" to leave the required RPATH/RUNPATH in the installed binary that was created correctly during the build stage.

system parameters

• Solaris 11.4
• meson 0.63.3
• Python 3.7.14

One of our engineers found that reverting commit 06b1132f82eaaf805021b4b088701d9754e2af38 fixed this, which is odd, since the description of that commit makes it sound like it should fix this.

In the build directory elfdump -d src/egl/libEGL.so.1.0.0 shows the RPATH was set correctly when the library was built, but then meson install strips it and there is no RPATH in $DESTDIR/usr/lib/libEGL.so.1.0.0.

Digging further, it looks like get_rpath_dirs_from_link_args checks for which RPATHs to keep by looking for -Wl,-R flags, but our pkg-config files all report -R flags: https://github.com/mesonbuild/meson/blob/master/mesonbuild/backend/backends.py#L699

Adding a match for -R flags there seems to fix the problem, and leaves /usr/lib/xorg in the RPATH in $DESTDIR/usr/lib/libEGL.so.1.0.0.

[alanc]

https://github.com/oracle/solaris-userland/commit/b6cb6e29df305814649bc5153372111d1d17fd41 is the patch we're applying in the Solaris build of meson-0.63.3 for this for now.

[jeremyhu]

We're also seeing something similar on darwin, where we use -Wl,-rpath and not -Wl,-R. In my case, I'm specifying -Wl,-rpath,/opt/X11/lib/asan in LDFLAGS at configure time.

$ otool -l ./build.arm64/cvt/cvt | grep -B1 -A2 LC_RPATH
Load command 16
          cmd LC_RPATH
      cmdsize 32
         path /opt/X11/lib/asan (offset 12)
Load command 17
          cmd LC_RPATH
      cmdsize 32
         path @loader_path/../lib (offset 12)
Load command 18
          cmd LC_RPATH
      cmdsize 32
         path @executable_path (offset 12)
Load command 19
          cmd LC_RPATH
      cmdsize 128
         path /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/14.0.0/lib/darwin (offset 12)

[1037] ~/src/freedesktop/github/XQuartz/src/xorg/lib/libxcvt (master) $ otool -l /opt/X11/bin/cvt | grep -B1 -A2 LC_RPATH
# nada

[jeremyhu]

Hmm... it looks like the darwin case is different. It looks like you are matching -Wl,-rpath,..., and it looks like you intend to honor LDFLAGS that were specificed:

                # Don't remove rpaths specified in LDFLAGS.
                if libdir in self.get_external_rpath_dirs(target):
                    continue

but it's still getting stripped. I've filed another ticket for this: #11109