m4/manywarnings.m4

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