acinclude.m4

   1 dnl
   2 dnl Taken from gnome-common/macros2/gnome-compiler-flags.m4
   3 dnl
   4 dnl We've added:
   5 dnl   -Wextra -Wshadow -Wcast-align -Wwrite-strings -Waggregate-return -Wstrict-prototypes -Winline -Wredundant-decls
   6 dnl We've removed
   7 dnl   CFLAGS="$realsave_CFLAGS"
   8 dnl   to avoid clobbering user-specified CFLAGS
   9 dnl
  10 AC_DEFUN([LIBVIRT_COMPILE_WARNINGS],[
  11     dnl ******************************
  12     dnl More compiler warnings
  13     dnl ******************************
  14
  15     AC_ARG_ENABLE(compile-warnings,
  16                   [AC_HELP_STRING([--enable-compile-warnings=@<:@no/minimum/yes/maximum/error@:>@],
  17                                  [Turn on compiler warnings])],,
  18                   [enable_compile_warnings="m4_default([$1],[maximum])"])
  19
  20     warnCFLAGS=
  21
  22     common_flags=
  23     common_flags="$common_flags -Wp,-D_FORTIFY_SOURCE=2"
  24     common_flags="$common_flags -fexceptions"
  25     common_flags="$common_flags -fasynchronous-unwind-tables"
  26     common_flags="$common_flags -fdiagnostics-show-option"
  27
  28     case "$enable_compile_warnings" in
  29     no)
  30         try_compiler_flags=""
  31         ;;
  32     minimum)
  33         try_compiler_flags="-Wall -Wformat -Wformat-security $common_flags"
  34         ;;
  35     yes)
  36         try_compiler_flags="-Wall -Wformat -Wformat-security -Wmissing-prototypes $common_flags"
  37         ;;
  38     maximum|error)
  39         try_compiler_flags="-Wall -Wformat -Wformat-security"
  40         try_compiler_flags="$try_compiler_flags -Wmissing-prototypes"
  41         try_compiler_flags="$try_compiler_flags -Wnested-externs "
  42         try_compiler_flags="$try_compiler_flags -Wpointer-arith"
  43         try_compiler_flags="$try_compiler_flags -Wextra -Wshadow"
  44         try_compiler_flags="$try_compiler_flags -Wcast-align"
  45         try_compiler_flags="$try_compiler_flags -Wwrite-strings"
  46         try_compiler_flags="$try_compiler_flags -Waggregate-return"
  47         try_compiler_flags="$try_compiler_flags -Wstrict-prototypes"
  48         try_compiler_flags="$try_compiler_flags -Winline"
  49         try_compiler_flags="$try_compiler_flags -Wredundant-decls"
  50         try_compiler_flags="$try_compiler_flags -Wno-sign-compare"
  51         try_compiler_flags="$try_compiler_flags -Wlogical-op"
  52         try_compiler_flags="$try_compiler_flags $common_flags"
  53         if test "$enable_compile_warnings" = "error" ; then
  54             try_compiler_flags="$try_compiler_flags -Werror"
  55         fi
  56         ;;
  57     *)
  58         AC_MSG_ERROR(Unknown argument '$enable_compile_warnings' to --enable-compile-warnings)
  59         ;;
  60     esac
  61
  62     COMPILER_FLAGS=
  63     for option in $try_compiler_flags; do
  64         gl_COMPILER_FLAGS($option)
  65     done
  66     unset option
  67     unset try_compiler_flags
  68
  69     AC_ARG_ENABLE(iso-c,
  70                   AC_HELP_STRING([--enable-iso-c],
  71                                  [Try to warn if code is not ISO C ]),,
  72                   [enable_iso_c=no])
  73
  74     AC_MSG_CHECKING(what language compliance flags to pass to the C compiler)
  75     complCFLAGS=
  76     if test "x$enable_iso_c" != "xno"; then
  77         if test "x$GCC" = "xyes"; then
  78         case " $CFLAGS " in
  79             *[\ \       ]-ansi[\ \      ]*) ;;
  80             *) complCFLAGS="$complCFLAGS -ansi" ;;
  81         esac
  82         case " $CFLAGS " in
  83             *[\ \       ]-pedantic[\ \  ]*) ;;
  84             *) complCFLAGS="$complCFLAGS -pedantic" ;;
  85         esac
  86         fi
  87     fi
  88     AC_MSG_RESULT($complCFLAGS)
  89
  90     WARN_CFLAGS="$COMPILER_FLAGS $complCFLAGS"
  91     WARN_LDFLAGS=$WARN_CFLAGS
  92     AC_SUBST([WARN_CFLAGS])
  93     AC_SUBST([WARN_LDFLAGS])
  94
  95     dnl Needed to keep compile quiet on python 2.4
  96     COMPILER_FLAGS=
  97     gl_COMPILER_FLAGS(-Wno-redundant-decls)
  98     WARN_PYTHON_CFLAGS=$COMPILER_FLAGS
  99     AC_SUBST(WARN_PYTHON_CFLAGS)
 100 ])
 101
 102
 103 dnl
 104 dnl To support the old pkg-config from RHEL4 vintage, we need
 105 dnl to define the PKG_PROG_PKG_CONFIG macro if its not already
 106 dnl present
 107 m4_ifndef([PKG_PROG_PKG_CONFIG],
 108   [AC_DEFUN([PKG_PROG_PKG_CONFIG],
 109 [m4_pattern_forbid([^_?PKG_[A-Z_]+$])
 110 m4_pattern_allow([^PKG_CONFIG(_PATH)?$])
 111 AC_ARG_VAR([PKG_CONFIG], [path to pkg-config utility])dnl
 112 if test "x$ac_cv_env_PKG_CONFIG_set" != "xset"; then
 113         AC_PATH_TOOL([PKG_CONFIG], [pkg-config])
 114 fi
 115 if test -n "$PKG_CONFIG"; then
 116         _pkg_min_version=m4_default([$1], [0.9.0])
 117         AC_MSG_CHECKING([pkg-config is at least version $_pkg_min_version])
 118         if $PKG_CONFIG --atleast-pkgconfig-version $_pkg_min_version; then
 119                 AC_MSG_RESULT([yes])
 120         else
 121                 AC_MSG_RESULT([no])
 122                 PKG_CONFIG=""
 123         fi
 124 fi[]dnl
 125 ])])