| 1 | # manywarnings.m4 serial 3
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| 2 | dnl Copyright (C) 2008-2012 Free Software Foundation, Inc.
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| 3 | dnl This file is free software; the Free Software Foundation
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| 4 | dnl gives unlimited permission to copy and/or distribute it,
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| 5 | dnl with or without modifications, as long as this notice is preserved.
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| 6 |
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| 7 | dnl From Simon Josefsson
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| 8 |
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| 9 | # gl_MANYWARN_COMPLEMENT(OUTVAR, LISTVAR, REMOVEVAR)
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| 10 | # --------------------------------------------------
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| 11 | # Copy LISTVAR to OUTVAR except for the entries in REMOVEVAR.
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| 12 | # Elements separated by whitespace. In set logic terms, the function
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| 13 | # does OUTVAR = LISTVAR \ REMOVEVAR.
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| 14 | AC_DEFUN([gl_MANYWARN_COMPLEMENT],
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| 15 | [
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| 16 | gl_warn_set=
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| 17 | set x $2; shift
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| 18 | for gl_warn_item
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| 19 | do
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| 20 | case " $3 " in
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| 21 | *" $gl_warn_item "*)
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| 22 | ;;
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| 23 | *)
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| 24 | gl_warn_set="$gl_warn_set $gl_warn_item"
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| 25 | ;;
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| 26 | esac
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| 27 | done
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| 28 | $1=$gl_warn_set
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| 29 | ])
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| 30 |
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| 31 | # gl_MANYWARN_ALL_GCC(VARIABLE)
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| 32 | # -----------------------------
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| 33 | # Add all documented GCC warning parameters to variable VARIABLE.
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| 34 | # Note that you need to test them using gl_WARN_ADD if you want to
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| 35 | # make sure your gcc understands it.
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| 36 | AC_DEFUN([gl_MANYWARN_ALL_GCC],
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| 37 | [
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| 38 | dnl First, check if -Wno-missing-field-initializers is needed.
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| 39 | dnl -Wmissing-field-initializers is implied by -W, but that issues
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| 40 | dnl warnings with GCC version before 4.7, for the common idiom
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| 41 | dnl of initializing types on the stack to zero, using { 0, }
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| 42 | AC_REQUIRE([AC_PROG_CC])
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| 43 | if test -n "$GCC"; then
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| 44 |
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| 45 | dnl First, check -W -Werror -Wno-missing-field-initializers is supported
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| 46 | dnl with the current $CC $CFLAGS $CPPFLAGS.
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| 47 | AC_MSG_CHECKING([whether -Wno-missing-field-initializers is supported])
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| 48 | AC_CACHE_VAL([gl_cv_cc_nomfi_supported], [
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| 49 | gl_save_CFLAGS="$CFLAGS"
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| 50 | CFLAGS="$CFLAGS -W -Werror -Wno-missing-field-initializers"
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| 51 | AC_COMPILE_IFELSE(
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| 52 | [AC_LANG_PROGRAM([[]], [[]])],
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| 53 | [gl_cv_cc_nomfi_supported=yes],
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| 54 | [gl_cv_cc_nomfi_supported=no])
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| 55 | CFLAGS="$gl_save_CFLAGS"])
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| 56 | AC_MSG_RESULT([$gl_cv_cc_nomfi_supported])
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| 57 |
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| 58 | if test "$gl_cv_cc_nomfi_supported" = yes; then
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| 59 | dnl Now check whether -Wno-missing-field-initializers is needed
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| 60 | dnl for the { 0, } construct.
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| 61 | AC_MSG_CHECKING([whether -Wno-missing-field-initializers is needed])
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| 62 | AC_CACHE_VAL([gl_cv_cc_nomfi_needed], [
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| 63 | gl_save_CFLAGS="$CFLAGS"
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| 64 | CFLAGS="$CFLAGS -W -Werror"
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| 65 | AC_COMPILE_IFELSE(
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| 66 | [AC_LANG_PROGRAM(
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| 67 | [[void f (void)
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| 68 | {
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| 69 | typedef struct { int a; int b; } s_t;
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| 70 | s_t s1 = { 0, };
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| 71 | }
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| 72 | ]],
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| 73 | [[]])],
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| 74 | [gl_cv_cc_nomfi_needed=no],
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| 75 | [gl_cv_cc_nomfi_needed=yes])
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| 76 | CFLAGS="$gl_save_CFLAGS"
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| 77 | ])
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| 78 | AC_MSG_RESULT([$gl_cv_cc_nomfi_needed])
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| 79 | fi
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| 80 | fi
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| 81 |
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| 82 | gl_manywarn_set=
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| 83 | for gl_manywarn_item in \
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| 84 | -Wall \
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| 85 | -W \
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| 86 | -Wformat-y2k \
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| 87 | -Wformat-nonliteral \
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| 88 | -Wformat-security \
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| 89 | -Winit-self \
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| 90 | -Wmissing-include-dirs \
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| 91 | -Wswitch-default \
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| 92 | -Wswitch-enum \
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| 93 | -Wunused \
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| 94 | -Wunknown-pragmas \
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| 95 | -Wstrict-aliasing \
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| 96 | -Wstrict-overflow \
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| 97 | -Wsystem-headers \
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| 98 | -Wfloat-equal \
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| 99 | -Wtraditional \
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| 100 | -Wtraditional-conversion \
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| 101 | -Wdeclaration-after-statement \
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| 102 | -Wundef \
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| 103 | -Wshadow \
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| 104 | -Wunsafe-loop-optimizations \
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| 105 | -Wpointer-arith \
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| 106 | -Wbad-function-cast \
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| 107 | -Wc++-compat \
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| 108 | -Wcast-qual \
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| 109 | -Wcast-align \
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| 110 | -Wwrite-strings \
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| 111 | -Wconversion \
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| 112 | -Wsign-conversion \
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| 113 | -Wlogical-op \
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| 114 | -Waggregate-return \
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| 115 | -Wstrict-prototypes \
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| 116 | -Wold-style-definition \
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| 117 | -Wmissing-prototypes \
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| 118 | -Wmissing-declarations \
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| 119 | -Wmissing-noreturn \
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| 120 | -Wmissing-format-attribute \
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| 121 | -Wpacked \
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| 122 | -Wpadded \
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| 123 | -Wredundant-decls \
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| 124 | -Wnested-externs \
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| 125 | -Wunreachable-code \
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| 126 | -Winline \
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| 127 | -Winvalid-pch \
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| 128 | -Wlong-long \
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| 129 | -Wvla \
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| 130 | -Wvolatile-register-var \
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| 131 | -Wdisabled-optimization \
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| 132 | -Wstack-protector \
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| 133 | -Woverlength-strings \
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| 134 | -Wbuiltin-macro-redefined \
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| 135 | -Wmudflap \
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| 136 | -Wpacked-bitfield-compat \
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| 137 | -Wsync-nand \
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| 138 | ; do
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| 139 | gl_manywarn_set="$gl_manywarn_set $gl_manywarn_item"
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| 140 | done
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| 141 | # The following are not documented in the manual but are included in
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| 142 | # output from gcc --help=warnings.
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| 143 | for gl_manywarn_item in \
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| 144 | -Wattributes \
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| 145 | -Wcoverage-mismatch \
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| 146 | -Wmultichar \
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| 147 | -Wunused-macros \
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| 148 | ; do
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| 149 | gl_manywarn_set="$gl_manywarn_set $gl_manywarn_item"
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| 150 | done
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| 151 | # More warnings from gcc 4.6.2 --help=warnings.
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| 152 | for gl_manywarn_item in \
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| 153 | -Wabi \
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| 154 | -Wcpp \
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| 155 | -Wdeprecated \
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| 156 | -Wdeprecated-declarations \
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| 157 | -Wdiv-by-zero \
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| 158 | -Wdouble-promotion \
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| 159 | -Wendif-labels \
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| 160 | -Wextra \
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| 161 | -Wformat-contains-nul \
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| 162 | -Wformat-extra-args \
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| 163 | -Wformat-zero-length \
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| 164 | -Wformat=2 \
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| 165 | -Wmultichar \
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| 166 | -Wnormalized=nfc \
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| 167 | -Woverflow \
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| 168 | -Wpointer-to-int-cast \
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| 169 | -Wpragmas \
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| 170 | -Wsuggest-attribute=const \
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| 171 | -Wsuggest-attribute=noreturn \
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| 172 | -Wsuggest-attribute=pure \
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| 173 | -Wtrampolines \
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| 174 | ; do
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| 175 | gl_manywarn_set="$gl_manywarn_set $gl_manywarn_item"
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| 176 | done
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| 177 |
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| 178 | # Disable the missing-field-initializers warning if needed
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| 179 | if test "$gl_cv_cc_nomfi_needed" = yes; then
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| 180 | gl_manywarn_set="$gl_manywarn_set -Wno-missing-field-initializers"
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| 181 | fi
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| 182 |
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| 183 | $1=$gl_manywarn_set
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| 184 | ])
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