acmacro/gnome-warnings.m4

   1
   2
   3 dnl GNOME_COMPILE_WARNINGS
   4 dnl Turn on many useful compiler warnings
   5 dnl For now, only works on GCC
   6 AC_DEFUN([GNOME_COMPILE_WARNINGS],[
   7   AC_ARG_ENABLE(compile-warnings,
   8     [  --enable-compile-warnings=[no/minimum/yes]       Turn on compiler warnings.],,enable_compile_warnings=yes)
   9
  10   AC_MSG_CHECKING(the warning flags for this compiler)
  11   warnCFLAGS=
  12   if test "x$GCC" = "xyes"; then
  13     case " $CFLAGS " in
  14     *-Wall*) ;;
  15     *) warnCFLAGS="-g -Wall -Wunused" ;;
  16     esac
  17
  18     ## -W is not all that useful.  And it cannot be controlled
  19     ## with individual -Wno-xxx flags, unlike -Wall
  20     if test "x$enable_compile_warnings" = "xyes"; then
  21       warnCFLAGS="$warnCFLAGS  -Wmissing-prototypes -Wmissing-declarations \
  22  -finline-functions  -Wshadow -Wpointer-arith -Wchar-subscripts \
  23  -Wformat=2 -Wno-unused-variable -Wno-unused-function -Wwrite-strings -Werror"
  24     fi
  25   fi
  26
  27   AC_MSG_RESULT($warnCFLAGS)
  28
  29   AC_ARG_ENABLE(iso-c,
  30     [  --enable-iso-c          Try to warn if code is not ISO C ],,
  31     enable_iso_c=no)
  32
  33   AC_MSG_CHECKING(the language compliance flags for this compiler)
  34   complCFLAGS=
  35   if test "x$GCC" = "xyes"; then
  36     case " $CFLAGS " in
  37     *-ansi*) ;;
  38     *) complCFLAGS="$complCFLAGS -ansi" ;;
  39     esac
  40
  41     case " $CFLAGS " in
  42     *-pedantic*) ;;
  43     *) complCFLAGS="$complCFLAGS -pedantic" ;;
  44     esac
  45   fi
  46   AC_MSG_RESULT($complCFLAGS)
  47
  48
  49   AC_MSG_CHECKING(the optimization flags for this compiler)
  50   optCFLAGS=
  51   if test "x$GCC" = "xyes" ; then
  52       optCFLAGS="-ffast-math -funroll-loops -fno-strict-aliasing"
  53       case " $CFLAGS " in
  54       *-O*) ;;
  55       *) optCFLAGS="-03" ;;
  56       esac
  57   fi
  58   AC_MSG_RESULT($complCFLAGS)
  59
  60   # Take the right flags
  61   if test "x$cflags_set" != "xyes" ; then
  62     if test "x$enable_iso_c" != "xno"; then
  63       CFLAGS="$CFLAGS $complCFLAGS"
  64     fi
  65     if test "x$enable_compile_warnings" != "xno" ; then
  66       CFLAGS="$CFLAGS $warnCFLAGS"
  67     fi
  68
  69     cflags_set=yes
  70     AC_SUBST(cflags_set)
  71   fi
  72 ])