ToolChains/Gnu.cpp: ARMLibDirs search also in lib32

* in some strange multilib configs we build lib32-image where
  32bit libs are in /usr/lib32 and 64bit in /usr/lib64 but in such
  setup the clang search for GCC candidate installation doesn't
  check lib32 directory in sysroot and fails to find the installation

  X86LibDirs was already searching in lib32 for very long time:
  llvm@621fed5
  but ARMLibDirs didn't include it for some reason.

* if we don't add lib32 for arm in getOSLibDir(), then it will
  find -lgcc, crtbeginS.o, crtendS.o, but still fail to find
  -lgcc_s, -lc, Scrt1.o, crti.o, crtn.o

* fixes lib32-compiler-rt build failure:

-- Configuring incomplete, errors occurred!
CMake Error at TOPDIR/BUILD/work/raspberrypi4_64-oemllib32-linux-gnueabi/lib32-compiler-rt/16.0.6/recipe-sysroot-native/usr/share/cmake-3.26/Modules/CMakeTestCCompiler.cmake:67 (message):
  The C compiler

    "TOPDIR/BUILD/work/raspberrypi4_64-oemllib32-linux-gnueabi/lib32-compiler-rt/16.0.6/recipe-sysroot-native/usr/bin/arm-oemllib32-linux-gnueabi/arm-oemllib32-linux-gnueabi-clang"

  is not able to compile a simple test program.

  It fails with the following output:

    Change Dir: TOPDIR/BUILD/work/raspberrypi4_64-oemllib32-linux-gnueabi/lib32-compiler-rt/16.0.6/build/CMakeFiles/CMakeScratch/TryCompile-rWXyQZ

    Run Build Command(s):ninja -v cmTC_84d18 && [1/2] TOPDIR/BUILD/work/raspberrypi4_64-oemllib32-linux-gnueabi/lib32-compiler-rt/16.0.6/recipe-sysroot-native/usr/bin/arm-oemllib32-linux-gnueabi/arm-oemllib32-linux-gnueabi-clang --target=arm-oemllib32-linux-gnueabi --sysroot=TOPDIR/BUILD/work/raspberrypi4_64-oemllib32-linux-gnueabi/lib32-compiler-rt/16.0.6/lib32-recipe-sysroot   -target arm-oemllib32-linux-gnueabi  -march=armv7ve -mthumb -mfpu=neon-vfpv4 -mfloat-abi=softfp -mlittle-endian --dyld-prefix=/usr -Qunused-arguments -funwind-tables -fstack-protector-strong  -O2 -D_FORTIFY_SOURCE=2 -Wformat -Wformat-security -Werror=format-security -Werror=return-type -D_TIME_BITS=64 -D_FILE_OFFSET_BITS=64  --sysroot=TOPDIR/BUILD/work/raspberrypi4_64-oemllib32-linux-gnueabi/lib32-compiler-rt/16.0.6/lib32-recipe-sysroot  -O2 -pipe -g -feliminate-unused-debug-types   -fmacro-prefix-map=TOPDIR/BUILD/work-shared/llvm-project-source-16.0.6-r0/git=/usr/src/debug/lib32-compiler-rt/16.0.6-r0  -fdebug-prefix-map=TOPDIR/BUILD/work-shared/llvm-project-source-16.0.6-r0/git=/usr/src/debug/lib32-compiler-rt/16.0.6-r0  -fmacro-prefix-map=TOPDIR/BUILD/work/raspberrypi4_64-oemllib32-linux-gnueabi/lib32-compiler-rt/16.0.6/build=/usr/src/debug/lib32-compiler-rt/16.0.6-r0  -fdebug-prefix-map=TOPDIR/BUILD/work/raspberrypi4_64-oemllib32-linux-gnueabi/lib32-compiler-rt/16.0.6/build=/usr/src/debug/lib32-compiler-rt/16.0.6-r0  -fdebug-prefix-map=TOPDIR/BUILD/work/raspberrypi4_64-oemllib32-linux-gnueabi/lib32-compiler-rt/16.0.6/lib32-recipe-sysroot=  -fmacro-prefix-map=TOPDIR/BUILD/work/raspberrypi4_64-oemllib32-linux-gnueabi/lib32-compiler-rt/16.0.6/lib32-recipe-sysroot=  -fdebug-prefix-map=TOPDIR/BUILD/work/raspberrypi4_64-oemllib32-linux-gnueabi/lib32-compiler-rt/16.0.6/recipe-sysroot-native=    -fPIE -MD -MT CMakeFiles/cmTC_84d18.dir/testCCompiler.c.o -MF CMakeFiles/cmTC_84d18.dir/testCCompiler.c.o.d -o CMakeFiles/cmTC_84d18.dir/testCCompiler.c.o -c TOPDIR/BUILD/work/raspberrypi4_64-oemllib32-linux-gnueabi/lib32-compiler-rt/16.0.6/build/CMakeFiles/CMakeScratch/TryCompile-rWXyQZ/testCCompiler.c
    [2/2] : && TOPDIR/BUILD/work/raspberrypi4_64-oemllib32-linux-gnueabi/lib32-compiler-rt/16.0.6/recipe-sysroot-native/usr/bin/arm-oemllib32-linux-gnueabi/arm-oemllib32-linux-gnueabi-clang --target=arm-oemllib32-linux-gnueabi --sysroot=TOPDIR/BUILD/work/raspberrypi4_64-oemllib32-linux-gnueabi/lib32-compiler-rt/16.0.6/lib32-recipe-sysroot -target arm-oemllib32-linux-gnueabi  -march=armv7ve -mthumb -mfpu=neon-vfpv4 -mfloat-abi=softfp -mlittle-endian --dyld-prefix=/usr -Qunused-arguments -funwind-tables -fstack-protector-strong  -O2 -D_FORTIFY_SOURCE=2 -Wformat -Wformat-security -Werror=format-security -Werror=return-type -D_TIME_BITS=64 -D_FILE_OFFSET_BITS=64  --sysroot=TOPDIR/BUILD/work/raspberrypi4_64-oemllib32-linux-gnueabi/lib32-compiler-rt/16.0.6/lib32-recipe-sysroot  -O2 -pipe -g -feliminate-unused-debug-types   -fmacro-prefix-map=TOPDIR/BUILD/work-shared/llvm-project-source-16.0.6-r0/git=/usr/src/debug/lib32-compiler-rt/16.0.6-r0  -fdebug-prefix-map=TOPDIR/BUILD/work-shared/llvm-project-source-16.0.6-r0/git=/usr/src/debug/lib32-compiler-rt/16.0.6-r0  -fmacro-prefix-map=TOPDIR/BUILD/work/raspberrypi4_64-oemllib32-linux-gnueabi/lib32-compiler-rt/16.0.6/build=/usr/src/debug/lib32-compiler-rt/16.0.6-r0  -fdebug-prefix-map=TOPDIR/BUILD/work/raspberrypi4_64-oemllib32-linux-gnueabi/lib32-compiler-rt/16.0.6/build=/usr/src/debug/lib32-compiler-rt/16.0.6-r0  -fdebug-prefix-map=TOPDIR/BUILD/work/raspberrypi4_64-oemllib32-linux-gnueabi/lib32-compiler-rt/16.0.6/lib32-recipe-sysroot=  -fmacro-prefix-map=TOPDIR/BUILD/work/raspberrypi4_64-oemllib32-linux-gnueabi/lib32-compiler-rt/16.0.6/lib32-recipe-sysroot=  -fdebug-prefix-map=TOPDIR/BUILD/work/raspberrypi4_64-oemllib32-linux-gnueabi/lib32-compiler-rt/16.0.6/recipe-sysroot-native= -target arm-oemllib32-linux-gnueabi  -march=armv7ve -mthumb -mfpu=neon-vfpv4 -mfloat-abi=softfp -mlittle-endian --dyld-prefix=/usr -Qunused-arguments -funwind-tables -fstack-protector-strong  -O2 -D_FORTIFY_SOURCE=2 -Wformat -Wformat-security -Werror=format-security -Werror=return-type -D_TIME_BITS=64 -D_FILE_OFFSET_BITS=64  --sysroot=TOPDIR/BUILD/work/raspberrypi4_64-oemllib32-linux-gnueabi/lib32-compiler-rt/16.0.6/lib32-recipe-sysroot  -Wl,-O1 -Wl,--hash-style=gnu -Wl,--as-needed   -fmacro-prefix-map=TOPDIR/BUILD/work-shared/llvm-project-source-16.0.6-r0/git=/usr/src/debug/lib32-compiler-rt/16.0.6-r0  -fdebug-prefix-map=TOPDIR/BUILD/work-shared/llvm-project-source-16.0.6-r0/git=/usr/src/debug/lib32-compiler-rt/16.0.6-r0  -fmacro-prefix-map=TOPDIR/BUILD/work/raspberrypi4_64-oemllib32-linux-gnueabi/lib32-compiler-rt/16.0.6/build=/usr/src/debug/lib32-compiler-rt/16.0.6-r0  -fdebug-prefix-map=TOPDIR/BUILD/work/raspberrypi4_64-oemllib32-linux-gnueabi/lib32-compiler-rt/16.0.6/build=/usr/src/debug/lib32-compiler-rt/16.0.6-r0  -fdebug-prefix-map=TOPDIR/BUILD/work/raspberrypi4_64-oemllib32-linux-gnueabi/lib32-compiler-rt/16.0.6/lib32-recipe-sysroot=  -fmacro-prefix-map=TOPDIR/BUILD/work/raspberrypi4_64-oemllib32-linux-gnueabi/lib32-compiler-rt/16.0.6/lib32-recipe-sysroot=  -fdebug-prefix-map=TOPDIR/BUILD/work/raspberrypi4_64-oemllib32-linux-gnueabi/lib32-compiler-rt/16.0.6/recipe-sysroot-native=  -Wl,-z,relro,-z,now -unwindlib=libgcc -rtlib=libgcc -stdlib=libstdc++   -fuse-ld=lld -Wl,-O1 -Wl,--hash-style=gnu -Wl,--as-needed   -fmacro-prefix-map=TOPDIR/BUILD/work-shared/llvm-project-source-16.0.6-r0/git=/usr/src/debug/lib32-compiler-rt/16.0.6-r0  -fdebug-prefix-map=TOPDIR/BUILD/work-shared/llvm-project-source-16.0.6-r0/git=/usr/src/debug/lib32-compiler-rt/16.0.6-r0  -fmacro-prefix-map=TOPDIR/BUILD/work/raspberrypi4_64-oemllib32-linux-gnueabi/lib32-compiler-rt/16.0.6/build=/usr/src/debug/lib32-compiler-rt/16.0.6-r0  -fdebug-prefix-map=TOPDIR/BUILD/work/raspberrypi4_64-oemllib32-linux-gnueabi/lib32-compiler-rt/16.0.6/build=/usr/src/debug/lib32-compiler-rt/16.0.6-r0  -fdebug-prefix-map=TOPDIR/BUILD/work/raspberrypi4_64-oemllib32-linux-gnueabi/lib32-compiler-rt/16.0.6/lib32-recipe-sysroot=  -fmacro-prefix-map=TOPDIR/BUILD/work/raspberrypi4_64-oemllib32-linux-gnueabi/lib32-compiler-rt/16.0.6/lib32-recipe-sysroot=  -fdebug-prefix-map=TOPDIR/BUILD/work/raspberrypi4_64-oemllib32-linux-gnueabi/lib32-compiler-rt/16.0.6/recipe-sysroot-native=  -Wl,-z,relro,-z,now -unwindlib=libgcc -rtlib=libgcc -stdlib=libstdc++   -fuse-ld=lld CMakeFiles/cmTC_84d18.dir/testCCompiler.c.o -o cmTC_84d18   && :
    FAILED: cmTC_84d18
    : && TOPDIR/BUILD/work/raspberrypi4_64-oemllib32-linux-gnueabi/lib32-compiler-rt/16.0.6/recipe-sysroot-native/usr/bin/arm-oemllib32-linux-gnueabi/arm-oemllib32-linux-gnueabi-clang --target=arm-oemllib32-linux-gnueabi --sysroot=TOPDIR/BUILD/work/raspberrypi4_64-oemllib32-linux-gnueabi/lib32-compiler-rt/16.0.6/lib32-recipe-sysroot -target arm-oemllib32-linux-gnueabi  -march=armv7ve -mthumb -mfpu=neon-vfpv4 -mfloat-abi=softfp -mlittle-endian --dyld-prefix=/usr -Qunused-arguments -funwind-tables -fstack-protector-strong  -O2 -D_FORTIFY_SOURCE=2 -Wformat -Wformat-security -Werror=format-security -Werror=return-type -D_TIME_BITS=64 -D_FILE_OFFSET_BITS=64  --sysroot=TOPDIR/BUILD/work/raspberrypi4_64-oemllib32-linux-gnueabi/lib32-compiler-rt/16.0.6/lib32-recipe-sysroot  -O2 -pipe -g -feliminate-unused-debug-types   -fmacro-prefix-map=TOPDIR/BUILD/work-shared/llvm-project-source-16.0.6-r0/git=/usr/src/debug/lib32-compiler-rt/16.0.6-r0  -fdebug-prefix-map=TOPDIR/BUILD/work-shared/llvm-project-source-16.0.6-r0/git=/usr/src/debug/lib32-compiler-rt/16.0.6-r0  -fmacro-prefix-map=TOPDIR/BUILD/work/raspberrypi4_64-oemllib32-linux-gnueabi/lib32-compiler-rt/16.0.6/build=/usr/src/debug/lib32-compiler-rt/16.0.6-r0  -fdebug-prefix-map=TOPDIR/BUILD/work/raspberrypi4_64-oemllib32-linux-gnueabi/lib32-compiler-rt/16.0.6/build=/usr/src/debug/lib32-compiler-rt/16.0.6-r0  -fdebug-prefix-map=TOPDIR/BUILD/work/raspberrypi4_64-oemllib32-linux-gnueabi/lib32-compiler-rt/16.0.6/lib32-recipe-sysroot=  -fmacro-prefix-map=TOPDIR/BUILD/work/raspberrypi4_64-oemllib32-linux-gnueabi/lib32-compiler-rt/16.0.6/lib32-recipe-sysroot=  -fdebug-prefix-map=TOPDIR/BUILD/work/raspberrypi4_64-oemllib32-linux-gnueabi/lib32-compiler-rt/16.0.6/recipe-sysroot-native= -target arm-oemllib32-linux-gnueabi  -march=armv7ve -mthumb -mfpu=neon-vfpv4 -mfloat-abi=softfp -mlittle-endian --dyld-prefix=/usr -Qunused-arguments -funwind-tables -fstack-protector-strong  -O2 -D_FORTIFY_SOURCE=2 -Wformat -Wformat-security -Werror=format-security -Werror=return-type -D_TIME_BITS=64 -D_FILE_OFFSET_BITS=64  --sysroot=TOPDIR/BUILD/work/raspberrypi4_64-oemllib32-linux-gnueabi/lib32-compiler-rt/16.0.6/lib32-recipe-sysroot  -Wl,-O1 -Wl,--hash-style=gnu -Wl,--as-needed   -fmacro-prefix-map=TOPDIR/BUILD/work-shared/llvm-project-source-16.0.6-r0/git=/usr/src/debug/lib32-compiler-rt/16.0.6-r0  -fdebug-prefix-map=TOPDIR/BUILD/work-shared/llvm-project-source-16.0.6-r0/git=/usr/src/debug/lib32-compiler-rt/16.0.6-r0  -fmacro-prefix-map=TOPDIR/BUILD/work/raspberrypi4_64-oemllib32-linux-gnueabi/lib32-compiler-rt/16.0.6/build=/usr/src/debug/lib32-compiler-rt/16.0.6-r0  -fdebug-prefix-map=TOPDIR/BUILD/work/raspberrypi4_64-oemllib32-linux-gnueabi/lib32-compiler-rt/16.0.6/build=/usr/src/debug/lib32-compiler-rt/16.0.6-r0  -fdebug-prefix-map=TOPDIR/BUILD/work/raspberrypi4_64-oemllib32-linux-gnueabi/lib32-compiler-rt/16.0.6/lib32-recipe-sysroot=  -fmacro-prefix-map=TOPDIR/BUILD/work/raspberrypi4_64-oemllib32-linux-gnueabi/lib32-compiler-rt/16.0.6/lib32-recipe-sysroot=  -fdebug-prefix-map=TOPDIR/BUILD/work/raspberrypi4_64-oemllib32-linux-gnueabi/lib32-compiler-rt/16.0.6/recipe-sysroot-native=  -Wl,-z,relro,-z,now -unwindlib=libgcc -rtlib=libgcc -stdlib=libstdc++   -fuse-ld=lld -Wl,-O1 -Wl,--hash-style=gnu -Wl,--as-needed   -fmacro-prefix-map=TOPDIR/BUILD/work-shared/llvm-project-source-16.0.6-r0/git=/usr/src/debug/lib32-compiler-rt/16.0.6-r0  -fdebug-prefix-map=TOPDIR/BUILD/work-shared/llvm-project-source-16.0.6-r0/git=/usr/src/debug/lib32-compiler-rt/16.0.6-r0  -fmacro-prefix-map=TOPDIR/BUILD/work/raspberrypi4_64-oemllib32-linux-gnueabi/lib32-compiler-rt/16.0.6/build=/usr/src/debug/lib32-compiler-rt/16.0.6-r0  -fdebug-prefix-map=TOPDIR/BUILD/work/raspberrypi4_64-oemllib32-linux-gnueabi/lib32-compiler-rt/16.0.6/build=/usr/src/debug/lib32-compiler-rt/16.0.6-r0  -fdebug-prefix-map=TOPDIR/BUILD/work/raspberrypi4_64-oemllib32-linux-gnueabi/lib32-compiler-rt/16.0.6/lib32-recipe-sysroot=  -fmacro-prefix-map=TOPDIR/BUILD/work/raspberrypi4_64-oemllib32-linux-gnueabi/lib32-compiler-rt/16.0.6/lib32-recipe-sysroot=  -fdebug-prefix-map=TOPDIR/BUILD/work/raspberrypi4_64-oemllib32-linux-gnueabi/lib32-compiler-rt/16.0.6/recipe-sysroot-native=  -Wl,-z,relro,-z,now -unwindlib=libgcc -rtlib=libgcc -stdlib=libstdc++   -fuse-ld=lld CMakeFiles/cmTC_84d18.dir/testCCompiler.c.o -o cmTC_84d18   && :
    arm-oemllib32-linux-gnueabi-ld.lld: error: cannot open Scrt1.o: No such file or directory
    arm-oemllib32-linux-gnueabi-ld.lld: error: cannot open crti.o: No such file or directory
    arm-oemllib32-linux-gnueabi-ld.lld: error: cannot open crtbeginS.o: No such file or directory
    arm-oemllib32-linux-gnueabi-ld.lld: error: unable to find library -lgcc
    arm-oemllib32-linux-gnueabi-ld.lld: error: unable to find library -lgcc_s
    arm-oemllib32-linux-gnueabi-ld.lld: error: unable to find library -lc
    arm-oemllib32-linux-gnueabi-ld.lld: error: unable to find library -lgcc
    arm-oemllib32-linux-gnueabi-ld.lld: error: unable to find library -lgcc_s
    arm-oemllib32-linux-gnueabi-ld.lld: error: cannot open crtendS.o: No such file or directory
    arm-oemllib32-linux-gnueabi-ld.lld: error: cannot open crtn.o: No such file or directory
    clang-16: error: linker command failed with exit code 1 (use -v to see invocation)
    ninja: build stopped: subcommand failed.

Upstream-Status: Pending
Signed-off-by: Martin Jansa <[email protected]>

Author: shr-project

clang/lib/Driver/ToolChains/Gnu.cpp

@@ -2418,7 +2418,7 @@ void Generic_GCC::GCCInstallationDetector::AddDefaultGCCPrefixes(
   static const char *const AArch64beLibDirs[] = {"/lib"};
   static const char *const AArch64beTriples[] = {"aarch64_be-none-linux-gnu"};
 
-  static const char *const ARMLibDirs[] = {"/lib"};
+  static const char *const ARMLibDirs[] = {"/lib", "/lib32"};
   static const char *const ARMTriples[] = {"arm-linux-gnueabi"};
   static const char *const ARMHFTriples[] = {"arm-linux-gnueabihf",
                                              "armv7hl-redhat-linux-gnueabi",

clang/lib/Driver/ToolChains/Linux.cpp

@@ -198,6 +198,7 @@ static StringRef getOSLibDir(const llvm::Triple &Triple, const ArgList &Args) {
   // reasoning about oslibdir spellings with the lib dir spellings in the
   // GCCInstallationDetector, but that is a more significant refactoring.
   if (Triple.getArch() == llvm::Triple::x86 || Triple.isPPC32() ||
+      Triple.getArch() == llvm::Triple::arm || Triple.getArch() == llvm::Triple::thumb ||
       Triple.getArch() == llvm::Triple::sparc)
     return "lib32";