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     -W \
  85     -Wabi \
  86     -Waddress \
  87     -Wall \
  88     -Warray-bounds \
  89     -Wattributes \
  90     -Wbad-function-cast \
  91     -Wbuiltin-macro-redefined \
  92     -Wcast-align \
  93     -Wchar-subscripts \
  94     -Wclobbered \
  95     -Wcomment \
  96     -Wcomments \
  97     -Wcoverage-mismatch \
  98     -Wcpp \
  99     -Wdeprecated \
 100     -Wdeprecated-declarations \
 101     -Wdisabled-optimization \
 102     -Wdiv-by-zero \
 103     -Wdouble-promotion \
 104     -Wempty-body \
 105     -Wendif-labels \
 106     -Wenum-compare \
 107     -Wextra \
 108     -Wformat-contains-nul \
 109     -Wformat-extra-args \
 110     -Wformat-nonliteral \
 111     -Wformat-security \
 112     -Wformat-y2k \
 113     -Wformat-zero-length \
 114     -Wformat=2 \
 115     -Wfree-nonheap-object \
 116     -Wignored-qualifiers \
 117     -Wimplicit \
 118     -Wimplicit-function-declaration \
 119     -Wimplicit-int \
 120     -Winit-self \
 121     -Winline \
 122     -Wint-to-pointer-cast \
 123     -Winvalid-memory-model \
 124     -Winvalid-pch \
 125     -Wjump-misses-init \
 126     -Wlogical-op \
 127     -Wmain \
 128     -Wmaybe-uninitialized \
 129     -Wmissing-braces \
 130     -Wmissing-declarations \
 131     -Wmissing-field-initializers \
 132     -Wmissing-format-attribute \
 133     -Wmissing-include-dirs \
 134     -Wmissing-noreturn \
 135     -Wmissing-parameter-type \
 136     -Wmissing-prototypes \
 137     -Wmudflap \
 138     -Wmultichar \
 139     -Wnarrowing \
 140     -Wnested-externs \
 141     -Wnonnull \
 142     -Wnormalized=nfc \
 143     -Wold-style-declaration \
 144     -Wold-style-definition \
 145     -Woverflow \
 146     -Woverlength-strings \
 147     -Woverride-init \
 148     -Wpacked \
 149     -Wpacked-bitfield-compat \
 150     -Wparentheses \
 151     -Wpointer-arith \
 152     -Wpointer-sign \
 153     -Wpointer-to-int-cast \
 154     -Wpragmas \
 155     -Wreturn-type \
 156     -Wsequence-point \
 157     -Wshadow \
 158     -Wsizeof-pointer-memaccess \
 159     -Wstack-protector \
 160     -Wstrict-aliasing \
 161     -Wstrict-overflow \
 162     -Wstrict-prototypes \
 163     -Wsuggest-attribute=const \
 164     -Wsuggest-attribute=format \
 165     -Wsuggest-attribute=noreturn \
 166     -Wsuggest-attribute=pure \
 167     -Wswitch \
 168     -Wswitch-default \
 169     -Wsync-nand \
 170     -Wsystem-headers \
 171     -Wtrampolines \
 172     -Wtrigraphs \
 173     -Wtype-limits \
 174     -Wuninitialized \
 175     -Wunknown-pragmas \
 176     -Wunreachable-code \
 177     -Wunsafe-loop-optimizations \
 178     -Wunused \
 179     -Wunused-but-set-parameter \
 180     -Wunused-but-set-variable \
 181     -Wunused-function \
 182     -Wunused-label \
 183     -Wunused-local-typedefs \
 184     -Wunused-macros \
 185     -Wunused-parameter \
 186     -Wunused-result \
 187     -Wunused-value \
 188     -Wunused-variable \
 189     -Wvarargs \
 190     -Wvariadic-macros \
 191     -Wvector-operation-performance \
 192     -Wvla \
 193     -Wvolatile-register-var \
 194     -Wwrite-strings \
 195     \
 196     ; do
 197     gl_manywarn_set="$gl_manywarn_set $gl_manywarn_item"
 198   done
 199
 200   # Disable the missing-field-initializers warning if needed
 201   if test "$gl_cv_cc_nomfi_needed" = yes; then
 202     gl_manywarn_set="$gl_manywarn_set -Wno-missing-field-initializers"
 203   fi
 204
 205   $1=$gl_manywarn_set
 206 ])