Build libgo with -Wa,-nH if possible (PR go/78978) [non-libgo parts]
libstdc++-v3:
PR go/78978
* acinclude.m4 (GLIBCXX_CHECK_ASSEMBLER_HWCAP): Remove.
* configure.ac: Call GCC_CHECK_ASSEMBLER_HWCAP instead of
GLIBCXX_CHECK_ASSEMBLER_HWCAP.
* fragment.am (CONFIG_CXXFLAGS): Use HWCAP_CFLAGS instead of
HWCAP_FLAGS.
* aclocal.m4: Regenerate.
* configure: Regenerate.
* Makefile.in, doc/Makefile.in, include/Makefile.in,
libsupc++/Makefile.in, po/Makefile.in, python/Makefile.in,
src/Makefile.in, src/c++11/Makefile.in, src/c++98/Makefile.in,
src/filesystem/Makefile.in, testsuite/Makefile.in: Regenerate.
config:
PR go/78978
* hwcaps.m4 (GCC_CHECK_ASSEMBLER_HWCAP): New macro.
From-SVN: r244162
2017-01-06 22:33:47 +08:00
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dnl
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dnl Check if the assembler used supports disabling generation of hardware
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dnl capabilities. This is only supported by Solaris as at the moment.
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dnl
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dnl Defines:
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dnl HWCAP_CFLAGS='-Wa,-nH' if possible.
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dnl
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AC_DEFUN([GCC_CHECK_ASSEMBLER_HWCAP], [
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test -z "$HWCAP_CFLAGS" && HWCAP_CFLAGS=''
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# Restrict the test to Solaris, other assemblers (e.g. AIX as) have -nH
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# with a different meaning.
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case ${target_os} in
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solaris2*)
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ac_save_CFLAGS="$CFLAGS"
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CFLAGS="$CFLAGS -Wa,-nH"
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AC_MSG_CHECKING([for as that supports -Wa,-nH])
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AC_TRY_COMPILE([], [return 0;], [ac_hwcap_flags=yes],[ac_hwcap_flags=no])
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if test "$ac_hwcap_flags" = "yes"; then
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HWCAP_CFLAGS="-Wa,-nH $HWCAP_CFLAGS"
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fi
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AC_MSG_RESULT($ac_hwcap_flags)
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CFLAGS="$ac_save_CFLAGS"
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;;
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esac
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AC_SUBST(HWCAP_CFLAGS)
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])
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2016-12-12 21:40:21 +08:00
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dnl
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dnl Check if the linker used supports linker maps to clear hardware
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dnl capabilities. This is only supported on Solaris at the moment.
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dnl
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dnl Defines:
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dnl HWCAP_LDFLAGS=-mclear-hwcap if possible
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dnl LD (as a side effect of testing)
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dnl
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AC_DEFUN([GCC_CHECK_LINKER_HWCAP], [
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test -z "$HWCAP_LDFLAGS" && HWCAP_LDFLAGS=''
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AC_REQUIRE([AC_PROG_LD])
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ac_save_LDFLAGS="$LDFLAGS"
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LDFLAGS="$LFLAGS -mclear-hwcap"
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AC_MSG_CHECKING([for -mclear-hwcap])
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AC_TRY_LINK([], [return 0;], [ac_hwcap_ldflags=yes],[ac_hwcap_ldflags=no])
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if test "$ac_hwcap_ldflags" = "yes"; then
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HWCAP_LDFLAGS="-mclear-hwcap $HWCAP_LDFLAGS"
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fi
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AC_MSG_RESULT($ac_hwcap_ldflags)
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LDFLAGS="$ac_save_LDFLAGS"
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AC_SUBST(HWCAP_LDFLAGS)
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AM_CONDITIONAL(HAVE_HWCAP, test $ac_hwcap_ldflags != no)
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])
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