This fixes gcc warning about -Wmudflap on fedora 21
---
m4/manywarnings.m4 | 213 ++++++++++++++++++++++++++++++++++-------------------
1 file changed, 137 insertions(+), 76 deletions(-)
diff --git a/m4/manywarnings.m4 b/m4/manywarnings.m4
index fd0e372..3e6dd21 100644
--- a/m4/manywarnings.m4
+++ b/m4/manywarnings.m4
@@ -1,5 +1,5 @@
-# manywarnings.m4 serial 3
-dnl Copyright (C) 2008-2012 Free Software Foundation, Inc.
+# manywarnings.m4 serial 7
+dnl Copyright (C) 2008-2014 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
@@ -35,14 +35,12 @@ AC_DEFUN([gl_MANYWARN_COMPLEMENT],
# make sure your gcc understands it.
AC_DEFUN([gl_MANYWARN_ALL_GCC],
[
- dnl First, check if -Wno-missing-field-initializers is needed.
- dnl -Wmissing-field-initializers is implied by -W, but that issues
- dnl warnings with GCC version before 4.7, for the common idiom
- dnl of initializing types on the stack to zero, using { 0, }
+ dnl First, check for some issues that only occur when combining multiple
+ dnl gcc warning categories.
AC_REQUIRE([AC_PROG_CC])
if test -n "$GCC"; then
- dnl First, check -W -Werror -Wno-missing-field-initializers is supported
+ dnl Check if -W -Werror -Wno-missing-field-initializers is supported
dnl with the current $CC $CFLAGS $CPPFLAGS.
AC_MSG_CHECKING([whether -Wno-missing-field-initializers is supported])
AC_CACHE_VAL([gl_cv_cc_nomfi_supported], [
@@ -77,108 +75,171 @@ AC_DEFUN([gl_MANYWARN_ALL_GCC],
])
AC_MSG_RESULT([$gl_cv_cc_nomfi_needed])
fi
+
+ dnl Next, check if -Werror -Wuninitialized is useful with the
+ dnl user's choice of $CFLAGS; some versions of gcc warn that it
+ dnl has no effect if -O is not also used
+ AC_MSG_CHECKING([whether -Wuninitialized is supported])
+ AC_CACHE_VAL([gl_cv_cc_uninitialized_supported], [
+ gl_save_CFLAGS="$CFLAGS"
+ CFLAGS="$CFLAGS -Werror -Wuninitialized"
+ AC_COMPILE_IFELSE(
+ [AC_LANG_PROGRAM([[]], [[]])],
+ [gl_cv_cc_uninitialized_supported=yes],
+ [gl_cv_cc_uninitialized_supported=no])
+ CFLAGS="$gl_save_CFLAGS"])
+ AC_MSG_RESULT([$gl_cv_cc_uninitialized_supported])
+
fi
+ # List all gcc warning categories.
+ # To compare this list to your installed GCC's, run this Bash command:
+ #
+ # comm -3 \
+ # <(sed -n 's/^ *\(-[^ ]*\) .*/\1/p' manywarnings.m4 | sort) \
+ # <(gcc --help=warnings | sed -n 's/^ \(-[^ ]*\) .*/\1/p' | sort |
+ # grep -v -x -f <(
+ # awk '/^[^#]/ {print $1}' ../build-aux/gcc-warning.spec))
+
gl_manywarn_set=
for gl_manywarn_item in \
- -Wall \
-W \
- -Wformat-y2k \
- -Wformat-nonliteral \
- -Wformat-security \
- -Winit-self \
- -Wmissing-include-dirs \
- -Wswitch-default \
- -Wswitch-enum \
- -Wunused \
- -Wunknown-pragmas \
- -Wstrict-aliasing \
- -Wstrict-overflow \
- -Wsystem-headers \
- -Wfloat-equal \
- -Wtraditional \
- -Wtraditional-conversion \
- -Wdeclaration-after-statement \
- -Wundef \
- -Wshadow \
- -Wunsafe-loop-optimizations \
- -Wpointer-arith \
+ -Wabi \
+ -Waddress \
+ -Waggressive-loop-optimizations \
+ -Wall \
+ -Warray-bounds \
+ -Wattributes \
-Wbad-function-cast \
- -Wc++-compat \
- -Wcast-qual \
- -Wcast-align \
- -Wwrite-strings \
- -Wconversion \
- -Wsign-conversion \
- -Wlogical-op \
- -Waggregate-return \
- -Wstrict-prototypes \
- -Wold-style-definition \
- -Wmissing-prototypes \
- -Wmissing-declarations \
- -Wmissing-noreturn \
- -Wmissing-format-attribute \
- -Wpacked \
- -Wpadded \
- -Wredundant-decls \
- -Wnested-externs \
- -Wunreachable-code \
- -Winline \
- -Winvalid-pch \
- -Wlong-long \
- -Wvla \
- -Wvolatile-register-var \
- -Wdisabled-optimization \
- -Wstack-protector \
- -Woverlength-strings \
-Wbuiltin-macro-redefined \
- -Wmudflap \
- -Wpacked-bitfield-compat \
- -Wsync-nand \
- ; do
- gl_manywarn_set="$gl_manywarn_set $gl_manywarn_item"
- done
- # The following are not documented in the manual but are included in
- # output from gcc --help=warnings.
- for gl_manywarn_item in \
- -Wattributes \
+ -Wcast-align \
+ -Wchar-subscripts \
+ -Wclobbered \
+ -Wcomment \
+ -Wcomments \
-Wcoverage-mismatch \
- -Wmultichar \
- -Wunused-macros \
- ; do
- gl_manywarn_set="$gl_manywarn_set $gl_manywarn_item"
- done
- # More warnings from gcc 4.6.2 --help=warnings.
- for gl_manywarn_item in \
- -Wabi \
-Wcpp \
+ -Wdate-time \
-Wdeprecated \
-Wdeprecated-declarations \
+ -Wdisabled-optimization \
-Wdiv-by-zero \
-Wdouble-promotion \
+ -Wempty-body \
-Wendif-labels \
+ -Wenum-compare \
-Wextra \
-Wformat-contains-nul \
-Wformat-extra-args \
+ -Wformat-nonliteral \
+ -Wformat-security \
+ -Wformat-y2k \
-Wformat-zero-length \
- -Wformat=2 \
+ -Wfree-nonheap-object \
+ -Wignored-qualifiers \
+ -Wimplicit \
+ -Wimplicit-function-declaration \
+ -Wimplicit-int \
+ -Winit-self \
+ -Winline \
+ -Wint-to-pointer-cast \
+ -Winvalid-memory-model \
+ -Winvalid-pch \
+ -Wjump-misses-init \
+ -Wlogical-op \
+ -Wmain \
+ -Wmaybe-uninitialized \
+ -Wmissing-braces \
+ -Wmissing-declarations \
+ -Wmissing-field-initializers \
+ -Wmissing-include-dirs \
+ -Wmissing-parameter-type \
+ -Wmissing-prototypes \
-Wmultichar \
- -Wnormalized=nfc \
+ -Wnarrowing \
+ -Wnested-externs \
+ -Wnonnull \
+ -Wold-style-declaration \
+ -Wold-style-definition \
+ -Wopenmp-simd \
-Woverflow \
+ -Woverlength-strings \
+ -Woverride-init \
+ -Wpacked \
+ -Wpacked-bitfield-compat \
+ -Wparentheses \
+ -Wpointer-arith \
+ -Wpointer-sign \
-Wpointer-to-int-cast \
-Wpragmas \
+ -Wreturn-local-addr \
+ -Wreturn-type \
+ -Wsequence-point \
+ -Wshadow \
+ -Wsizeof-pointer-memaccess \
+ -Wstack-protector \
+ -Wstrict-aliasing \
+ -Wstrict-overflow \
+ -Wstrict-prototypes \
-Wsuggest-attribute=const \
+ -Wsuggest-attribute=format \
-Wsuggest-attribute=noreturn \
-Wsuggest-attribute=pure \
+ -Wswitch \
+ -Wswitch-default \
+ -Wsync-nand \
+ -Wsystem-headers \
-Wtrampolines \
+ -Wtrigraphs \
+ -Wtype-limits \
+ -Wuninitialized \
+ -Wunknown-pragmas \
+ -Wunsafe-loop-optimizations \
+ -Wunused \
+ -Wunused-but-set-parameter \
+ -Wunused-but-set-variable \
+ -Wunused-function \
+ -Wunused-label \
+ -Wunused-local-typedefs \
+ -Wunused-macros \
+ -Wunused-parameter \
+ -Wunused-result \
+ -Wunused-value \
+ -Wunused-variable \
+ -Wvarargs \
+ -Wvariadic-macros \
+ -Wvector-operation-performance \
+ -Wvla \
+ -Wvolatile-register-var \
+ -Wwrite-strings \
+ \
; do
gl_manywarn_set="$gl_manywarn_set $gl_manywarn_item"
done
- # Disable the missing-field-initializers warning if needed
+ # gcc --help=warnings outputs an unusual form for this option; list
+ # it here so that the above 'comm' command doesn't report a false match.
+ gl_manywarn_set="$gl_manywarn_set -Wnormalized=nfc"
+
+ # These are needed for older GCC versions.
+ if test -n "$GCC"; then
+ case `($CC --version) 2>/dev/null` in
+ 'gcc (GCC) '[[0-3]].* | \
+ 'gcc (GCC) '4.[[0-7]].*)
+ gl_manywarn_set="$gl_manywarn_set -fdiagnostics-show-option"
+ gl_manywarn_set="$gl_manywarn_set -funit-at-a-time"
+ ;;
+ esac
+ fi
+
+ # Disable specific options as needed.
if test "$gl_cv_cc_nomfi_needed" = yes; then
gl_manywarn_set="$gl_manywarn_set -Wno-missing-field-initializers"
fi
+ if test "$gl_cv_cc_uninitialized_supported" = no; then
+ gl_manywarn_set="$gl_manywarn_set -Wno-uninitialized"
+ fi
+
$1=$gl_manywarn_set
])
--
2.1.0
--
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