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configure: when performing a compiler feature test for a -Wno-foo flag, attempt 

to use -Wfoo instead of -Wno-foo. This works around a bug in some versions of
gcc, where it will silently accept an unknown -Wno-foo option, but will
generate an error for a compile which uses -Wno-foo if that compile also
triggers any warnings.

llvm-svn: 174770
This commit is contained in:
Richard Smith 2013-02-08 22:55:10 +00:00
parent 388d767ab1
commit f89ffcd705
2 changed files with 10 additions and 14 deletions
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2
llvm/autoconf/m4/cxx_flag_check.m4
View File

@ -1,2 +1,2 @@
AC_DEFUN([CXX_FLAG_CHECK], AC_DEFUN([CXX_FLAG_CHECK],
[AC_SUBST($1, `$CXX -Werror $2 -fsyntax-only -xc /dev/null 2>/dev/null && echo $2`)]) [AC_SUBST($1, `$CXX -Werror patsubst($2, [^-Wno-], [-W]) -fsyntax-only -xc /dev/null 2>/dev/null && echo $2`)])

18
llvm/configure vendored
View File

@ -8719,8 +8719,6 @@ if test "${enable_ltdl_install+set}" = set; then
fi fi
if test x"${enable_ltdl_install-no}" != xno; then if test x"${enable_ltdl_install-no}" != xno; then
INSTALL_LTDL_TRUE= INSTALL_LTDL_TRUE=
INSTALL_LTDL_FALSE='#' INSTALL_LTDL_FALSE='#'
@ -8729,8 +8727,6 @@ else
INSTALL_LTDL_FALSE= INSTALL_LTDL_FALSE=
fi fi
if test x"${enable_ltdl_convenience-no}" != xno; then if test x"${enable_ltdl_convenience-no}" != xno; then
CONVENIENCE_LTDL_TRUE= CONVENIENCE_LTDL_TRUE=
CONVENIENCE_LTDL_FALSE='#' CONVENIENCE_LTDL_FALSE='#'
@ -10498,7 +10494,7 @@ else
lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2 lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
lt_status=$lt_dlunknown lt_status=$lt_dlunknown
cat > conftest.$ac_ext <<EOF cat > conftest.$ac_ext <<EOF
#line 10501 "configure" #line 10497 "configure"
#include "confdefs.h" #include "confdefs.h"
#if HAVE_DLFCN_H #if HAVE_DLFCN_H
@ -12261,21 +12257,21 @@ echo "${ECHO_T}ok" >&6; }
{ echo "$as_me:$LINENO: checking optional compiler flags" >&5 { echo "$as_me:$LINENO: checking optional compiler flags" >&5
echo $ECHO_N "checking optional compiler flags... $ECHO_C" >&6; } echo $ECHO_N "checking optional compiler flags... $ECHO_C" >&6; }
NO_VARIADIC_MACROS=`$CXX -Werror -Wno-variadic-macros -fsyntax-only -xc /dev/null 2>/dev/null && echo -Wno-variadic-macros` NO_VARIADIC_MACROS=`$CXX -Werror -Wvariadic-macros -fsyntax-only -xc /dev/null 2>/dev/null && echo -Wno-variadic-macros`
NO_MISSING_FIELD_INITIALIZERS=`$CXX -Werror -Wno-missing-field-initializers -fsyntax-only -xc /dev/null 2>/dev/null && echo -Wno-missing-field-initializers` NO_MISSING_FIELD_INITIALIZERS=`$CXX -Werror -Wmissing-field-initializers -fsyntax-only -xc /dev/null 2>/dev/null && echo -Wno-missing-field-initializers`
NO_NESTED_ANON_TYPES=`$CXX -Werror -Wno-nested-anon-types -fsyntax-only -xc /dev/null 2>/dev/null && echo -Wno-nested-anon-types` NO_NESTED_ANON_TYPES=`$CXX -Werror -Wnested-anon-types -fsyntax-only -xc /dev/null 2>/dev/null && echo -Wno-nested-anon-types`
COVERED_SWITCH_DEFAULT=`$CXX -Werror -Wcovered-switch-default -fsyntax-only -xc /dev/null 2>/dev/null && echo -Wcovered-switch-default` COVERED_SWITCH_DEFAULT=`$CXX -Werror -Wcovered-switch-default -fsyntax-only -xc /dev/null 2>/dev/null && echo -Wcovered-switch-default`
if test "$GXX" = "yes" if test "$GXX" = "yes"
then then
NO_MAYBE_UNINITIALIZED=`$CXX -Werror -Wno-maybe-uninitialized -fsyntax-only -xc /dev/null 2>/dev/null && echo -Wno-maybe-uninitialized` NO_MAYBE_UNINITIALIZED=`$CXX -Werror -Wmaybe-uninitialized -fsyntax-only -xc /dev/null 2>/dev/null && echo -Wno-maybe-uninitialized`
if test "$NO_MAYBE_UNINITIALIZED" != "-Wno-maybe-uninitialized" if test "$NO_MAYBE_UNINITIALIZED" != "-Wno-maybe-uninitialized"
then then
NO_UNINITIALIZED=`$CXX -Werror -Wno-uninitialized -fsyntax-only -xc /dev/null 2>/dev/null && echo -Wno-uninitialized` NO_UNINITIALIZED=`$CXX -Werror -Wuninitialized -fsyntax-only -xc /dev/null 2>/dev/null && echo -Wno-uninitialized`
else else
gxx_version=`$CXX -dumpversion` gxx_version=`$CXX -dumpversion`
@ -12288,7 +12284,7 @@ then
NO_UNINITIALIZED= NO_UNINITIALIZED=
else else
NO_MAYBE_UNINITIALIZED= NO_MAYBE_UNINITIALIZED=
NO_UNINITIALIZED=`$CXX -Werror -Wno-uninitialized -fsyntax-only -xc /dev/null 2>/dev/null && echo -Wno-uninitialized` NO_UNINITIALIZED=`$CXX -Werror -Wuninitialized -fsyntax-only -xc /dev/null 2>/dev/null && echo -Wno-uninitialized`
fi fi
fi fi