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| author | Ian Lance Taylor <ian@gcc.gnu.org> | 2014-09-29 23:37:27 +0000 |
|---|---|---|
| committer | Ian Lance Taylor <ian@gcc.gnu.org> | 2014-09-29 23:37:27 +0000 |
| commit | a819231d57698c60fca33e720078c4dba5ee0d88 (patch) | |
| tree | bd6acdbba63b2782809e2af042e9315061e37c60 /libgo/configure.ac | |
| parent | 150dfa34a384bbc247a42989704bf96a9cdae8ad (diff) | |
| download | gcc-a819231d57698c60fca33e720078c4dba5ee0d88.zip gcc-a819231d57698c60fca33e720078c4dba5ee0d88.tar.gz gcc-a819231d57698c60fca33e720078c4dba5ee0d88.tar.bz2 | |
libgo/configure: Use -Qunused-arguments for asm tests if supported.
This supports clang, which by default issues warnings about
unused command line arguments, a habit that interacts poorly
with configure scripts.
From-SVN: r215699
Diffstat (limited to 'libgo/configure.ac')
| -rw-r--r-- | libgo/configure.ac | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/libgo/configure.ac b/libgo/configure.ac index 5e1e4d9..11bba70 100644 --- a/libgo/configure.ac +++ b/libgo/configure.ac @@ -785,14 +785,28 @@ else [Define to the flags needed for the .section .eh_frame directive.]) fi +AC_CACHE_CHECK([if compiler supports -Qunused-arguments], +[libgo_cv_c_unused_arguments], +[CFLAGS_hold=$CFLAGS +CFLAGS="$CFLAGS -Qunused-arguments" +AC_COMPILE_IFELSE([[int i;]], +[libgo_cv_c_unused_arguments=yes], +[libgo_cv_c_unused_arguments=no]) +CFLAGS=$CFLAGS_hold]) + AC_CACHE_CHECK([if assembler supports GNU comdat group syntax], libgo_cv_as_comdat_gnu, [ echo '.section .text,"axG",@progbits,.foo,comdat' > conftest.s +CFLAGS_hold=$CFLAGS +if test "$libgo_cv_c_unused_arguments" = yes; then + CFLAGS="$CFLAGS -Qunused-arguments" +fi if $CC $CFLAGS -c conftest.s > /dev/null 2>&1; then libgo_cv_as_comdat_gnu=yes else libgo_cv_as_comdat_gnu=no fi +CFLAGS=$CFLAGS_hold ]) if test "x$libgo_cv_as_comdat_gnu" = xyes; then AC_DEFINE(HAVE_AS_COMDAT_GAS, 1, @@ -803,9 +817,14 @@ AC_CACHE_CHECK([assembler supports pc related relocs], libgo_cv_as_x86_pcrel, [ libgo_cv_as_x86_pcrel=yes echo '.text; foo: nop; .data; .long foo-.; .text' > conftest.s +CFLAGS_hold=$CFLAGS +if test "$libgo_cv_c_unused_arguments" = yes; then + CFLAGS="$CFLAGS -Qunused-arguments" +fi if $CC $CFLAGS -c conftest.s 2>&1 | $EGREP -i 'illegal|warning' > /dev/null; then libgo_cv_as_x86_pcrel=no fi +CFLAGS=$CFLAGS_hold ]) if test "x$libgo_cv_as_x86_pcrel" = xyes; then AC_DEFINE(HAVE_AS_X86_PCREL, 1, @@ -816,9 +835,14 @@ AC_CACHE_CHECK([assembler supports unwind section type], libgo_cv_as_x86_64_unwind_section_type, [ libgo_cv_as_x86_64_unwind_section_type=yes echo '.section .eh_frame,"a",@unwind' > conftest.s +CFLAGS_hold=$CFLAGS +if test "$libgo_cv_c_unused_arguments" = yes; then + CFLAGS="$CFLAGS -Qunused-arguments" +fi if $CC $CFLAGS -c conftest.s 2>&1 | grep -i warning > /dev/null; then libgo_cv_as_x86_64_unwind_section_type=no fi +CFLAGS=$CFLAGS_hold ]) if test "x$libgo_cv_as_x86_64_unwind_section_type" = xyes; then AC_DEFINE(HAVE_AS_X86_64_UNWIND_SECTION_TYPE, 1, |