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Similar to commitfb5d27be27"libgomp: Consider '--with-build-sysroot=[...]' for target libraries' build-tree testing (instead of build-time 'CC' etc.) [PR91884, PR109951]", this is commit5ff06d762a"libatomic/test: Fix compilation for build sysroot" done differently, avoiding build-tree testing use of any random gunk that may appear in build-time 'CC'. PR testsuite/109951 libatomic/ * configure.ac: 'AC_SUBST(SYSROOT_CFLAGS_FOR_TARGET)'. * Makefile.in: Regenerate. * configure: Likewise. * testsuite/Makefile.in: Likewise. * testsuite/lib/libatomic.exp (libatomic_init): If '--with-build-sysroot=[...]' was specified, use it for build-tree testing. * testsuite/libatomic-site-extra.exp.in (GCC_UNDER_TEST): Don't set. (SYSROOT_CFLAGS_FOR_TARGET): Set.
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