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configure: remove workaround for gcc's -Wno-maybe-uninitialized

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Since r174770 gcc version check is not needed because CXX_FLAG_CHECK
implements the workaround itself.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@175080 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dmitri Gribenko 2013-02-13 21:19:39 +00:00
parent ccb51f923f
commit 7c62701c22
2 changed files with 16 additions and 44 deletions
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28
autoconf/configure.ac
View File

@ -1272,39 +1272,21 @@ CXX_FLAG_CHECK(NO_VARIADIC_MACROS, [-Wno-variadic-macros])
CXX_FLAG_CHECK(NO_MISSING_FIELD_INITIALIZERS, [-Wno-missing-field-initializers])
CXX_FLAG_CHECK(NO_NESTED_ANON_TYPES, [-Wno-nested-anon-types])
CXX_FLAG_CHECK(COVERED_SWITCH_DEFAULT, [-Wcovered-switch-default])
dnl GCC's potential uninitialized use analysis is weak and presents lots of
dnl false positives, so disable it.
NO_UNINITIALIZED=
NO_MAYBE_UNINITIALIZED=
if test "$GXX" = "yes"
then
CXX_FLAG_CHECK(NO_MAYBE_UNINITIALIZED, [-Wno-maybe-uninitialized])
dnl gcc 4.7 introduced -Wmaybe-uninitialized to distinguish cases which are
dnl known to be uninitialized from cases which might be uninitialized. We
dnl known to be uninitialized from cases which might be uninitialized. We
dnl still want to catch the first kind of errors.
if test "$NO_MAYBE_UNINITIALIZED" != "-Wno-maybe-uninitialized"
if test -z "$NO_MAYBE_UNINITIALIZED"
then
CXX_FLAG_CHECK(NO_UNINITIALIZED, [-Wno-uninitialized])
else
dnl Some versions of gcc accept unsupported -W flags if there is
dnl no warning but stop with an error when a warning is
dnl encountered. If this gcc is earlier than 4.7, just use
dnl -Wno-uninitialized.
gxx_version=`$CXX -dumpversion`
gxx_version_major=`echo $gxx_version | cut -d'.' -f1`
gxx_version_minor=`echo $gxx_version | cut -d'.' -f2`
gxx_version_patch=`echo $gxx_version | cut -d'.' -f3`
if test "$gxx_version_major" -ge "4" \
&& test "$gxx_version_minor" -ge "7"; then
dnl AC_SUBST doesn't work with empty strings.
NO_UNINITIALIZED=
else
NO_MAYBE_UNINITIALIZED=
CXX_FLAG_CHECK(NO_UNINITIALIZED, [-Wno-uninitialized])
fi
fi
else
NO_UNINITIALIZED=
NO_MAYBE_UNINITIALIZED=
fi
AC_MSG_RESULT([$NO_VARIADIC_MACROS $NO_MISSING_FIELD_INITIALIZERS $NO_NESTED_ANON_TYPES $COVERED_SWITCH_DEFAULT $NO_UNINITIALIZED $NO_MAYBE_UNINITIALIZED])

32
configure vendored
View File

@ -8719,7 +8719,9 @@ if test "${enable_ltdl_install+set}" = set; then
fi
if test x"${enable_ltdl_install-no}" != xno; then
if test x"${enable_ltdl_install-no}" != xno; then
INSTALL_LTDL_TRUE=
INSTALL_LTDL_FALSE='#'
else
@ -8727,7 +8729,9 @@ else
INSTALL_LTDL_FALSE=
fi
if test x"${enable_ltdl_convenience-no}" != xno; then
if test x"${enable_ltdl_convenience-no}" != xno; then
CONVENIENCE_LTDL_TRUE=
CONVENIENCE_LTDL_FALSE='#'
else
@ -10494,7 +10498,7 @@ else
lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
lt_status=$lt_dlunknown
cat > conftest.$ac_ext <<EOF
#line 10497 "configure"
#line 10501 "configure"
#include "confdefs.h"
#if HAVE_DLFCN_H
@ -12265,32 +12269,18 @@ NO_NESTED_ANON_TYPES=`$CXX -Werror -Wnested-anon-types -fsyntax-only -xc /dev/nu
COVERED_SWITCH_DEFAULT=`$CXX -Werror -Wcovered-switch-default -fsyntax-only -xc /dev/null 2>/dev/null && echo -Wcovered-switch-default`
NO_UNINITIALIZED=
NO_MAYBE_UNINITIALIZED=
if test "$GXX" = "yes"
then
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 -z "$NO_MAYBE_UNINITIALIZED"
then
NO_UNINITIALIZED=`$CXX -Werror -Wuninitialized -fsyntax-only -xc /dev/null 2>/dev/null && echo -Wno-uninitialized`
else
gxx_version=`$CXX -dumpversion`
gxx_version_major=`echo $gxx_version | cut -d'.' -f1`
gxx_version_minor=`echo $gxx_version | cut -d'.' -f2`
gxx_version_patch=`echo $gxx_version | cut -d'.' -f3`
if test "$gxx_version_major" -ge "4" \
&& test "$gxx_version_minor" -ge "7"; then
NO_UNINITIALIZED=
else
NO_MAYBE_UNINITIALIZED=
NO_UNINITIALIZED=`$CXX -Werror -Wuninitialized -fsyntax-only -xc /dev/null 2>/dev/null && echo -Wno-uninitialized`
fi
fi
else
NO_UNINITIALIZED=
NO_MAYBE_UNINITIALIZED=
fi
{ echo "$as_me:$LINENO: result: $NO_VARIADIC_MACROS $NO_MISSING_FIELD_INITIALIZERS $NO_NESTED_ANON_TYPES $COVERED_SWITCH_DEFAULT $NO_UNINITIALIZED $NO_MAYBE_UNINITIALIZED" >&5
echo "${ECHO_T}$NO_VARIADIC_MACROS $NO_MISSING_FIELD_INITIALIZERS $NO_NESTED_ANON_TYPES $COVERED_SWITCH_DEFAULT $NO_UNINITIALIZED $NO_MAYBE_UNINITIALIZED" >&6; }