/usr/share/aclocal/gnome-compiler-flags.m4 is in gnome-common 3.14.0-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 | # gnome-compiler-flags.m4
#
# serial 2
#
dnl GNOME_COMPILE_WARNINGS
dnl Turn on many useful compiler warnings and substitute the result into
dnl WARN_CFLAGS
dnl For now, only works on GCC
dnl Pass the default value of the --enable-compile-warnings configure option as
dnl the first argument to the macro, defaulting to 'yes'.
dnl Additional warning/error flags can be passed as an optional second argument.
dnl
dnl For example: GNOME_COMPILE_WARNINGS([maximum],[-Werror=some-flag -Wfoobar])
AC_DEFUN([GNOME_COMPILE_WARNINGS],[
dnl ******************************
dnl More compiler warnings
dnl ******************************
AC_ARG_ENABLE(compile-warnings,
AS_HELP_STRING([--enable-compile-warnings=@<:@no/minimum/yes/maximum/error@:>@],
[Turn on compiler warnings]),,
[enable_compile_warnings="m4_default([$1],[yes])"])
if test "x$GCC" != xyes; then
enable_compile_warnings=no
fi
warning_flags=
realsave_CFLAGS="$CFLAGS"
dnl These are warning flags that aren't marked as fatal. Can be
dnl overridden on a per-project basis with -Wno-foo.
base_warn_flags=" \
-Wall \
-Wstrict-prototypes \
-Wnested-externs \
"
dnl These compiler flags typically indicate very broken or suspicious
dnl code. Some of them such as implicit-function-declaration are
dnl just not default because gcc compiles a lot of legacy code.
dnl We choose to make this set into explicit errors.
base_error_flags=" \
-Werror=missing-prototypes \
-Werror=implicit-function-declaration \
-Werror=pointer-arith \
-Werror=init-self \
-Werror=format-security \
-Werror=format=2 \
-Werror=missing-include-dirs \
"
dnl Additional warning or error flags provided by the module author to
dnl allow stricter standards to be imposed on a per-module basis.
dnl The author can pass -W or -Werror flags here as they see fit.
additional_flags="m4_default([$2],[])"
case "$enable_compile_warnings" in
no)
warning_flags="-w"
;;
minimum)
warning_flags="-Wall"
;;
yes|maximum|error)
warning_flags="$base_warn_flags $base_error_flags $additional_flags"
;;
*)
AC_MSG_ERROR(Unknown argument '$enable_compile_warnings' to --enable-compile-warnings)
;;
esac
if test "$enable_compile_warnings" = "error" ; then
warning_flags="$warning_flags -Werror"
fi
dnl Check whether GCC supports the warning options
for option in $warning_flags; do
save_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS $option"
AC_MSG_CHECKING([whether gcc understands $option])
AC_TRY_COMPILE([], [],
has_option=yes,
has_option=no,)
CFLAGS="$save_CFLAGS"
AC_MSG_RESULT([$has_option])
if test $has_option = yes; then
tested_warning_flags="$tested_warning_flags $option"
fi
unset has_option
unset save_CFLAGS
done
unset option
CFLAGS="$realsave_CFLAGS"
AC_MSG_CHECKING(what warning flags to pass to the C compiler)
AC_MSG_RESULT($tested_warning_flags)
AC_ARG_ENABLE(iso-c,
AS_HELP_STRING([--enable-iso-c],
[Try to warn if code is not ISO C ]),,
[enable_iso_c=no])
AC_MSG_CHECKING(what language compliance flags to pass to the C compiler)
complCFLAGS=
if test "x$enable_iso_c" != "xno"; then
if test "x$GCC" = "xyes"; then
case " $CFLAGS " in
*[\ \ ]-ansi[\ \ ]*) ;;
*) complCFLAGS="$complCFLAGS -ansi" ;;
esac
case " $CFLAGS " in
*[\ \ ]-pedantic[\ \ ]*) ;;
*) complCFLAGS="$complCFLAGS -pedantic" ;;
esac
fi
fi
AC_MSG_RESULT($complCFLAGS)
WARN_CFLAGS="$tested_warning_flags $complCFLAGS"
AC_SUBST(WARN_CFLAGS)
])
dnl For C++, do basically the same thing.
AC_DEFUN([GNOME_CXX_WARNINGS],[
AC_ARG_ENABLE(cxx-warnings,
AS_HELP_STRING([--enable-cxx-warnings=@<:@no/minimum/yes@:>@]
[Turn on compiler warnings.]),,
[enable_cxx_warnings="m4_default([$1],[minimum])"])
AC_MSG_CHECKING(what warning flags to pass to the C++ compiler)
warnCXXFLAGS=
if test "x$GXX" != xyes; then
enable_cxx_warnings=no
fi
if test "x$enable_cxx_warnings" != "xno"; then
if test "x$GXX" = "xyes"; then
case " $CXXFLAGS " in
*[\ \ ]-Wall[\ \ ]*) ;;
*) warnCXXFLAGS="-Wall -Wno-unused" ;;
esac
## -W is not all that useful. And it cannot be controlled
## with individual -Wno-xxx flags, unlike -Wall
if test "x$enable_cxx_warnings" = "xyes"; then
warnCXXFLAGS="$warnCXXFLAGS -Wshadow -Woverloaded-virtual"
fi
fi
fi
AC_MSG_RESULT($warnCXXFLAGS)
AC_ARG_ENABLE(iso-cxx,
AS_HELP_STRING([--enable-iso-cxx],
[Try to warn if code is not ISO C++ ]),,
[enable_iso_cxx=no])
AC_MSG_CHECKING(what language compliance flags to pass to the C++ compiler)
complCXXFLAGS=
if test "x$enable_iso_cxx" != "xno"; then
if test "x$GXX" = "xyes"; then
case " $CXXFLAGS " in
*[\ \ ]-ansi[\ \ ]*) ;;
*) complCXXFLAGS="$complCXXFLAGS -ansi" ;;
esac
case " $CXXFLAGS " in
*[\ \ ]-pedantic[\ \ ]*) ;;
*) complCXXFLAGS="$complCXXFLAGS -pedantic" ;;
esac
fi
fi
AC_MSG_RESULT($complCXXFLAGS)
WARN_CXXFLAGS="$CXXFLAGS $warnCXXFLAGS $complCXXFLAGS"
AC_SUBST(WARN_CXXFLAGS)
])
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