-# manywarnings.m4 serial 7
-dnl Copyright (C) 2008-2016 Free Software Foundation, Inc.
+# manywarnings.m4 serial 17
+dnl Copyright (C) 2008-2018 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.
# Add all documented GCC warning parameters to variable VARIABLE.
# Note that you need to test them using gl_WARN_ADD if you want to
# make sure your gcc understands it.
+#
+# The effects of this macro depend on the current language (_AC_LANG).
AC_DEFUN([gl_MANYWARN_ALL_GCC],
+[_AC_LANG_DISPATCH([$0], _AC_LANG, $@)])
+
+# Specialization for _AC_LANG = C.
+# Use of m4_defun rather than AC_DEFUN works around a bug in autoconf < 2.63b.
+m4_defun([gl_MANYWARN_ALL_GCC(C)],
[
+ AC_LANG_PUSH([C])
+
dnl First, check for some issues that only occur when combining multiple
dnl gcc warning categories.
AC_REQUIRE([AC_PROG_CC])
dnl Check if -W -Werror -Wno-missing-field-initializers is supported
dnl with the current $CC $CFLAGS $CPPFLAGS.
- AC_MSG_CHECKING([whether -Wno-missing-field-initializers is supported])
- AC_CACHE_VAL([gl_cv_cc_nomfi_supported], [
- gl_save_CFLAGS="$CFLAGS"
- CFLAGS="$CFLAGS -W -Werror -Wno-missing-field-initializers"
- AC_COMPILE_IFELSE(
- [AC_LANG_PROGRAM([[]], [[]])],
- [gl_cv_cc_nomfi_supported=yes],
- [gl_cv_cc_nomfi_supported=no])
- CFLAGS="$gl_save_CFLAGS"])
- AC_MSG_RESULT([$gl_cv_cc_nomfi_supported])
+ AC_CACHE_CHECK([whether -Wno-missing-field-initializers is supported],
+ [gl_cv_cc_nomfi_supported],
+ [gl_save_CFLAGS="$CFLAGS"
+ CFLAGS="$CFLAGS -W -Werror -Wno-missing-field-initializers"
+ AC_COMPILE_IFELSE(
+ [AC_LANG_PROGRAM([[]], [[]])],
+ [gl_cv_cc_nomfi_supported=yes],
+ [gl_cv_cc_nomfi_supported=no])
+ CFLAGS="$gl_save_CFLAGS"
+ ])
if test "$gl_cv_cc_nomfi_supported" = yes; then
dnl Now check whether -Wno-missing-field-initializers is needed
dnl for the { 0, } construct.
- AC_MSG_CHECKING([whether -Wno-missing-field-initializers is needed])
- AC_CACHE_VAL([gl_cv_cc_nomfi_needed], [
- gl_save_CFLAGS="$CFLAGS"
- CFLAGS="$CFLAGS -W -Werror"
- AC_COMPILE_IFELSE(
- [AC_LANG_PROGRAM(
- [[void f (void)
- {
- typedef struct { int a; int b; } s_t;
- s_t s1 = { 0, };
- }
- ]],
- [[]])],
- [gl_cv_cc_nomfi_needed=no],
- [gl_cv_cc_nomfi_needed=yes])
- CFLAGS="$gl_save_CFLAGS"
- ])
- AC_MSG_RESULT([$gl_cv_cc_nomfi_needed])
+ AC_CACHE_CHECK([whether -Wno-missing-field-initializers is needed],
+ [gl_cv_cc_nomfi_needed],
+ [gl_save_CFLAGS="$CFLAGS"
+ CFLAGS="$CFLAGS -W -Werror"
+ AC_COMPILE_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[int f (void)
+ {
+ typedef struct { int a; int b; } s_t;
+ s_t s1 = { 0, };
+ return s1.b;
+ }
+ ]],
+ [[]])],
+ [gl_cv_cc_nomfi_needed=no],
+ [gl_cv_cc_nomfi_needed=yes])
+ CFLAGS="$gl_save_CFLAGS"
+ ])
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([$gl_cv_cc_uninitialized_supported])
+ AC_CACHE_CHECK([whether -Wuninitialized is supported],
+ [gl_cv_cc_uninitialized_supported],
+ [gl_save_CFLAGS="$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"
+ ])
fi
# 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))
+ # <((sed -n 's/^ *\(-[^ 0-9][^ ]*\) .*/\1/p' manywarnings.m4; \
+ # awk '/^[^#]/ {print $1}' ../build-aux/gcc-warning.spec) | sort) \
+ # <(LC_ALL=C gcc --help=warnings | sed -n 's/^ \(-[^ ]*\) .*/\1/p' | sort)
gl_manywarn_set=
- for gl_manywarn_item in \
+ for gl_manywarn_item in -fno-common \
-W \
- -Wabi \
-Waddress \
-Waggressive-loop-optimizations \
-Wall \
+ -Wattribute-alias \
-Wattributes \
-Wbad-function-cast \
-Wbool-compare \
+ -Wbool-operation \
+ -Wbuiltin-declaration-mismatch \
-Wbuiltin-macro-redefined \
-Wcast-align \
+ -Wcast-align=strict \
+ -Wcast-function-type \
-Wchar-subscripts \
- -Wchkp \
-Wclobbered \
-Wcomment \
-Wcomments \
-Wcoverage-mismatch \
-Wcpp \
+ -Wdangling-else \
-Wdate-time \
-Wdeprecated \
-Wdeprecated-declarations \
-Wdiscarded-qualifiers \
-Wdiv-by-zero \
-Wdouble-promotion \
+ -Wduplicated-branches \
+ -Wduplicated-cond \
+ -Wduplicate-decl-specifier \
-Wempty-body \
-Wendif-labels \
-Wenum-compare \
+ -Wexpansion-to-defined \
-Wextra \
-Wformat-contains-nul \
-Wformat-extra-args \
-Wformat-signedness \
-Wformat-y2k \
-Wformat-zero-length \
+ -Wframe-address \
-Wfree-nonheap-object \
+ -Whsa \
+ -Wif-not-aligned \
+ -Wignored-attributes \
-Wignored-qualifiers \
-Wimplicit \
-Wimplicit-function-declaration \
-Winit-self \
-Winline \
-Wint-conversion \
+ -Wint-in-bool-context \
-Wint-to-pointer-cast \
-Winvalid-memory-model \
-Winvalid-pch \
- -Wjump-misses-init \
-Wlogical-not-parentheses \
-Wlogical-op \
-Wmain \
-Wmaybe-uninitialized \
+ -Wmemset-elt-size \
-Wmemset-transposed-args \
+ -Wmisleading-indentation \
+ -Wmissing-attributes \
-Wmissing-braces \
-Wmissing-declarations \
-Wmissing-field-initializers \
-Wmissing-parameter-type \
-Wmissing-prototypes \
-Wmultichar \
+ -Wmultistatement-macros \
-Wnarrowing \
-Wnested-externs \
-Wnonnull \
+ -Wnonnull-compare \
+ -Wnull-dereference \
-Wodr \
-Wold-style-declaration \
-Wold-style-definition \
-Woverride-init \
-Wpacked \
-Wpacked-bitfield-compat \
+ -Wpacked-not-aligned \
-Wparentheses \
-Wpointer-arith \
+ -Wpointer-compare \
-Wpointer-sign \
-Wpointer-to-int-cast \
-Wpragmas \
+ -Wpsabi \
+ -Wrestrict \
-Wreturn-local-addr \
-Wreturn-type \
+ -Wscalar-storage-order \
-Wsequence-point \
-Wshadow \
-Wshift-count-negative \
-Wshift-count-overflow \
+ -Wshift-negative-value \
-Wsizeof-array-argument \
+ -Wsizeof-pointer-div \
-Wsizeof-pointer-memaccess \
-Wstack-protector \
-Wstrict-aliasing \
-Wstrict-overflow \
-Wstrict-prototypes \
+ -Wstringop-truncation \
+ -Wsuggest-attribute=cold \
-Wsuggest-attribute=const \
-Wsuggest-attribute=format \
+ -Wsuggest-attribute=malloc \
-Wsuggest-attribute=noreturn \
-Wsuggest-attribute=pure \
-Wsuggest-final-methods \
-Wsuggest-final-types \
-Wswitch \
-Wswitch-bool \
- -Wswitch-default \
+ -Wswitch-unreachable \
-Wsync-nand \
-Wsystem-headers \
+ -Wtautological-compare \
-Wtrampolines \
-Wtrigraphs \
-Wtype-limits \
# gcc --help=warnings outputs an unusual form for these options; list
# them here so that the above 'comm' command doesn't report a false match.
+ # Would prefer "min (PTRDIFF_MAX, SIZE_MAX)", but it must be a literal.
+ # Also, AC_COMPUTE_INT requires it to fit in a long; it is 2**63 on
+ # the only platforms where it does not fit in a long, so make that
+ # a special case.
+ AC_MSG_CHECKING([max safe object size])
+ AC_COMPUTE_INT([gl_alloc_max],
+ [LONG_MAX < (PTRDIFF_MAX < (size_t) -1 ? PTRDIFF_MAX : (size_t) -1)
+ ? -1
+ : PTRDIFF_MAX < (size_t) -1 ? (long) PTRDIFF_MAX : (long) (size_t) -1],
+ [[#include <limits.h>
+ #include <stddef.h>
+ #include <stdint.h>
+ ]],
+ [gl_alloc_max=2147483647])
+ case $gl_alloc_max in
+ -1) gl_alloc_max=9223372036854775807;;
+ esac
+ AC_MSG_RESULT([$gl_alloc_max])
+ gl_manywarn_set="$gl_manywarn_set -Walloc-size-larger-than=$gl_alloc_max"
gl_manywarn_set="$gl_manywarn_set -Warray-bounds=2"
+ gl_manywarn_set="$gl_manywarn_set -Wformat-overflow=2"
+ gl_manywarn_set="$gl_manywarn_set -Wformat-truncation=2"
+ gl_manywarn_set="$gl_manywarn_set -Wimplicit-fallthrough=5"
gl_manywarn_set="$gl_manywarn_set -Wnormalized=nfc"
+ gl_manywarn_set="$gl_manywarn_set -Wshift-overflow=2"
+ gl_manywarn_set="$gl_manywarn_set -Wstringop-overflow=2"
+ gl_manywarn_set="$gl_manywarn_set -Wunused-const-variable=2"
+ gl_manywarn_set="$gl_manywarn_set -Wvla-larger-than=4031"
# These are needed for older GCC versions.
if test -n "$GCC"; then
fi
$1=$gl_manywarn_set
+
+ AC_LANG_POP([C])
+])
+
+# Specialization for _AC_LANG = C++.
+# Use of m4_defun rather than AC_DEFUN works around a bug in autoconf < 2.63b.
+m4_defun([gl_MANYWARN_ALL_GCC(C++)],
+[
+ gl_MANYWARN_ALL_GCC_CXX_IMPL([$1])
])
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