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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
This commit is contained in:
Ian Lance Taylor 2014-09-29 23:37:27 +00:00
parent 150dfa34a3
commit a819231d57
2 changed files with 61 additions and 0 deletions
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37
libgo/configure vendored
View File

@ -15241,6 +15241,28 @@ $as_echo "#define EH_FRAME_FLAGS \"aw\"" >>confdefs.h
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking if compiler supports -Qunused-arguments" >&5
$as_echo_n "checking if compiler supports -Qunused-arguments... " >&6; }
if test "${libgo_cv_c_unused_arguments+set}" = set; then :
$as_echo_n "(cached) " >&6
else
CFLAGS_hold=$CFLAGS
CFLAGS="$CFLAGS -Qunused-arguments"
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
int i;
_ACEOF
if ac_fn_c_try_compile "$LINENO"; then :
libgo_cv_c_unused_arguments=yes
else
libgo_cv_c_unused_arguments=no
fi
rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
CFLAGS=$CFLAGS_hold
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libgo_cv_c_unused_arguments" >&5
$as_echo "$libgo_cv_c_unused_arguments" >&6; }
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking if assembler supports GNU comdat group syntax" >&5
$as_echo_n "checking if assembler supports GNU comdat group syntax... " >&6; }
if test "${libgo_cv_as_comdat_gnu+set}" = set; then :
@ -15248,11 +15270,16 @@ if test "${libgo_cv_as_comdat_gnu+set}" = set; then :
else
echo '.section .text,"axG",@progbits,.foo,comdat' > conftest.s
CFLAGS_hold=$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
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libgo_cv_as_comdat_gnu" >&5
@ -15271,9 +15298,14 @@ else
libgo_cv_as_x86_pcrel=yes
echo '.text; foo: nop; .data; .long foo-.; .text' > conftest.s
CFLAGS_hold=$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
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libgo_cv_as_x86_pcrel" >&5
@ -15292,9 +15324,14 @@ else
libgo_cv_as_x86_64_unwind_section_type=yes
echo '.section .eh_frame,"a",@unwind' > conftest.s
CFLAGS_hold=$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
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libgo_cv_as_x86_64_unwind_section_type" >&5

24
libgo/configure.ac
View File

@ -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,