m4/manywarnings.m4

   1 # manywarnings.m4 serial 1
   2 dnl Copyright (C) 2008-2011 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 (currently as per version 4.4) warning
  34 # parameters to variable VARIABLE.  Note that you need to test them
  35 # using gl_WARN_ADD if you want to 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="$gl_save_CFLAGS"])
  77      AC_MSG_RESULT([$gl_cv_cc_nomfi_needed])
  78    fi
  79  fi
  80
  81  gl_manywarn_set=
  82  for gl_manywarn_item in \
  83    -Wall \
  84    -W \
  85    -Wformat-y2k \
  86    -Wformat-nonliteral \
  87    -Wformat-security \
  88    -Winit-self \
  89    -Wmissing-include-dirs \
  90    -Wswitch-default \
  91    -Wswitch-enum \
  92    -Wunused \
  93    -Wunknown-pragmas \
  94    -Wstrict-aliasing \
  95    -Wstrict-overflow \
  96    -Wsystem-headers \
  97    -Wfloat-equal \
  98    -Wtraditional \
  99    -Wtraditional-conversion \
 100    -Wdeclaration-after-statement \
 101    -Wundef \
 102    -Wshadow \
 103    -Wunsafe-loop-optimizations \
 104    -Wpointer-arith \
 105    -Wbad-function-cast \
 106    -Wc++-compat \
 107    -Wcast-qual \
 108    -Wcast-align \
 109    -Wwrite-strings \
 110    -Wconversion \
 111    -Wsign-conversion \
 112    -Wlogical-op \
 113    -Waggregate-return \
 114    -Wstrict-prototypes \
 115    -Wold-style-definition \
 116    -Wmissing-prototypes \
 117    -Wmissing-declarations \
 118    -Wmissing-noreturn \
 119    -Wmissing-format-attribute \
 120    -Wpacked \
 121    -Wpadded \
 122    -Wredundant-decls \
 123    -Wnested-externs \
 124    -Wunreachable-code \
 125    -Winline \
 126    -Winvalid-pch \
 127    -Wlong-long \
 128    -Wvla \
 129    -Wvolatile-register-var \
 130    -Wdisabled-optimization \
 131    -Wstack-protector \
 132    -Woverlength-strings \
 133    -Wbuiltin-macro-redefined \
 134    -Wmudflap \
 135    -Wpacked-bitfield-compat \
 136    -Wsync-nand \
 137   ; do
 138     gl_manywarn_set="$gl_manywarn_set $gl_manywarn_item"
 139   done
 140  # The following are not documented in the manual but are included in
 141  # output from gcc --help=warnings.
 142  for gl_manywarn_item in \
 143    -Wattributes \
 144    -Wcoverage-mismatch \
 145    -Wmultichar \
 146    -Wunused-macros \
 147   ; do
 148     gl_manywarn_set="$gl_manywarn_set $gl_manywarn_item"
 149   done
 150
 151  # Disable the missing-field-initializers warning if needed
 152  if test "$gl_cv_cc_nomfi_needed" = yes; then
 153    gl_manywarn_set="$gl_manywarn_set -Wno-missing-field-initializers"
 154  fi
 155
 156  $1=$gl_manywarn_set
 157 ])