[PowerPC] Specify the dynamic loader prefix in ppc-float-abi-warning

[tuliom]

Summary

Ensure the tests do not fail during cross compilation by specifying
the dynamic loader prefix for a GNU installation that is expected to
support IEEE 128-bit long double.

[qiucf]

LGTM, thanks for catching this.

[tuliom]

@qiucf Thanks! I still don't have commit access yet. Could you land this patch for me, please?
Please use “Tulio Magno Quites Machado Filho [e-mail]” to commit the change.

clang/test/Driver/ppc-float-abi-warning.cpp

 // RUN:  FileCheck %s --check-prefix=NOWARN
 // RUN: %clang -### --driver-mode=g++ -target powerpc64le-linux-gnu %s\
 // RUN:  -mabi=ibmlongdouble -stdlib=libc++ -Wno-unsupported-abi 2>&1 | \
 // RUN:  FileCheck %s --check-prefix=NOWARN
 // RUN: %clang -### --driver-mode=g++ -target powerpc64le-linux-gnu %s\
 // RUN:  -mabi=ieeelongdouble -stdlib=libc++ -Wno-unsupported-abi 2>&1 | \
 // RUN:  FileCheck %s --check-prefix=NOWARN
 // RUN: %clang -### --driver-mode=g++ -target powerpc64le-linux-gnu %s\
+// RUN:  --dyld-prefix=%S/Inputs/powerpc64le-linux-gnu-tree/gcc-12 \
 // RUN:  -mabi=%if ppc_linux_default_ieeelongdouble %{ieeelongdouble%} \
 // RUN:  %else %{ibmlongdouble%} -stdlib=libc++ 2>&1 | \
 // RUN:  FileCheck %s --check-prefix=NOWARN
 // RUN: %clang -### --driver-mode=g++ -target powerpc64le-linux-gnu %s\
+// RUN:  --dyld-prefix=%S/Inputs/powerpc64le-linux-gnu-tree/gcc-12 \
 // RUN:  -mabi=%if ppc_linux_default_ieeelongdouble %{ibmlongdouble%} \
 // RUN:  %else %{ieeelongdouble%} -stdlib=libc++ 2>&1 | FileCheck %s
 
 // CHECK: warning: float ABI '{{.*}}' is not supported by current library
 // NOWARN-NOT: warning: float ABI '{{.*}}' is not supported by current library
 long double foo(long double x) { return x; }