[llvm-bugs] [Bug 33847] New: Clang fails to properly find the gcc installation when cross-compiling

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=33847

            Bug ID: 33847
           Summary: Clang fails to properly find the gcc installation when
                    cross-compiling
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Driver
          Assignee: unassignedclangbugs at nondot.org
          Reporter: jacekswierk at gmail.com
                CC: llvm-bugs at lists.llvm.org

Files like crtbegin.o and libgcc.a cannot be found by clang 5.0 while it worked
just fine for clang 4.0 and older releases. Using the following command fails
with clang from trunk with the message indicating missing crtbegin and libgcc:

clang -mthumb -mfloat-abi=hard -mfpu=neon-vfpv4 -mcpu=cortex-a15
--target=arm-poky-linux-gnueabi --gcc-toolchain=<target_sysroot>/usr
--sysroot=<target_sysroot> -B<native_sysroot>/usr/bin/arm-poky-linux-gnueabi
test.c -v

I can see that there is some issue with finding gcc toolchain as the verbose
output is missing few lines:

```
Found candidate GCC installation:
<target_sysroot>/usr/lib/gcc/arm-poky-linux-gnueabi/5.4.0
```

The same command works with older clangs and give verbose output:

```
Found candidate GCC installation:
<target_sysroot>/usr/lib/arm-poky-linux-gnueabi/5.4.0
Found candidate GCC installation:
<target_sysroot>/usr/lib/gcc/arm-poky-linux-gnueabi/5.4.0
Selected GCC installation:
<target_sysroot>/usr/lib/arm-poky-linux-gnueabi/5.4.0
Candidate multilib: .;@m32
Selected multilib: .;@m32
```

Adding -print-search-dirs gives similar results - clang 5.0:
```
programs: =
<llvm-5.0>/bin:
/..//bin

libraries: =
<llvm-5.0>/lib/clang/5.0.0:
<target_sysroot>/lib/../lib:
<target_sysroot>/usr/lib/arm-poky-linux-gnueabi:
<target_sysroot>/usr/lib/../lib:
<target_sysroot>/lib:
<target_sysroot>/usr/lib
```

and clang 4.0:
```
programs: =
<llvm-4.0>/bin:
<target_sysroot>/usr/lib/arm-poky-linux-gnueabi/5.4.0/../../../arm-poky-linux-gnueabi/bin

libraries: =
<llvm-4.0>/bin/../lib/clang/4.0.1:
<target_sysroot>/usr/lib/arm-poky-linux-gnueabi/5.4.0:
<target_sysroot>/usr/lib/arm-poky-linux-gnueabi/5.4.0/../../arm-poky-linux-gnueabi:
<target_sysroot>/usr/lib/arm-poky-linux-gnueabi/5.4.0/../../../lib:
<target_sysroot>/lib/../lib:
<target_sysroot>/usr/lib/arm-poky-linux-gnueabi:
<target_sysroot>/usr/lib/../lib:
<target_sysroot>/usr/lib/arm-poky-linux-gnueabi/../../lib:
<target_sysroot>/usr/lib/arm-poky-linux-gnueabi/5.4.0/../..:
<target_sysroot>/lib:
<target_sysroot>/usr/lib
```

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