libgomp: Consider '--with-build-sysroot=[...]' for target libraries' build-tree testing (instead of build-time 'CC' etc.) [PR91884, PR109951]
This is commit c8e759b421 (Subversion r279708)
"libgomp/test: Fix compilation for build sysroot" and follow-up
commit 749bd22ddc
"libgomp/test: Remove a build sysroot fix regression" done differently,
avoiding build-tree testing use of any random gunk that may appear in
build-time 'CC', 'CXX', 'FC'.
PR testsuite/91884
PR testsuite/109951
libgomp/
* configure.ac: Revert earlier changes, instead
'AC_SUBST(SYSROOT_CFLAGS_FOR_TARGET)'.
* Makefile.in: Regenerate.
* configure: Likewise.
* testsuite/Makefile.in: Likewise.
* testsuite/lib/libgomp.exp (libgomp_init): Remove
"Fix up '-funconfigured-libstdc++-v3' in 'GXX_UNDER_TEST'" code.
If '--with-build-sysroot=[...]' was specified, use it for
build-tree testing.
* testsuite/libgomp-site-extra.exp.in (GCC_UNDER_TEST)
(GXX_UNDER_TEST, GFORTRAN_UNDER_TEST): Don't set.
(SYSROOT_CFLAGS_FOR_TARGET): Set.
* testsuite/libgomp.c++/c++.exp (lang_source_re)
(lang_include_flags): Set for build-tree testing.
* testsuite/libgomp.oacc-c++/c++.exp (lang_source_re)
(lang_include_flags): Likewise.
Co-authored-by: Chung-Lin Tang <cltang@codesourcery.com>
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