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dnl handle various error-related things
dnl Thomas Vander Stichele <thomas@apestaart.org>
dnl Tim-Philipp Müller <tim centricular net>
dnl Last modification: 2008-02-18
dnl AG_GST_SET_ERROR_CFLAGS([ADD-WERROR], [MORE_FLAGS])
dnl AG_GST_SET_ERROR_CXXFLAGS([ADD-WERROR], [MORE_FLAGS])
dnl AG_GST_SET_LEVEL_DEFAULT([IS-GIT-VERSION])
dnl Sets WARNING_CFLAGS and ERROR_CFLAGS to something the compiler
dnl will accept and AC_SUBST them so they are available in Makefile
dnl
dnl WARNING_CFLAGS will contain flags to make the compiler emit more
dnl warnings.
dnl ERROR_CFLAGS will contain flags to make those warnings fatal,
dnl unless ADD-WERROR is set to "no"
dnl
dnl If MORE_FLAGS is set, tries to add each of the given flags
dnl to WARNING_CFLAGS if the compiler supports them. Each flag is
dnl tested separately.
dnl
dnl These flags can be overridden at make time:
dnl make ERROR_CFLAGS=
AC_DEFUN([AG_GST_SET_ERROR_CFLAGS],
[
AC_REQUIRE([AC_PROG_CC])
AC_REQUIRE([AS_COMPILER_FLAG])
WARNING_CFLAGS=""
ERROR_CFLAGS=""
dnl if we support -Wall, set it unconditionally
AS_COMPILER_FLAG(-Wall,
WARNING_CFLAGS="$WARNING_CFLAGS -Wall")
dnl Warn if declarations after statements are used (C99 extension)
AS_COMPILER_FLAG(-Wdeclaration-after-statement,
WARNING_CFLAGS="$WARNING_CFLAGS -Wdeclaration-after-statement")
dnl Warn if variable length arrays are used (C99 extension)
AS_COMPILER_FLAG(-Wvla,
WARNING_CFLAGS="$WARNING_CFLAGS -Wvla")
dnl Warn for invalid pointer arithmetic
AS_COMPILER_FLAG(-Wpointer-arith,
WARNING_CFLAGS="$WARNING_CFLAGS -Wpointer-arith")
dnl if asked for, add -Werror if supported
if test "x$1" != "xno"
then
AS_COMPILER_FLAG(-Werror, ERROR_CFLAGS="$ERROR_CFLAGS -Werror")
dnl if -Werror isn't suported, try -errwarn=%all (Sun Forte case)
if test "x$ERROR_CFLAGS" = "x"
then
AS_COMPILER_FLAG([-errwarn=%all], [
ERROR_CFLAGS="-errwarn=%all"
dnl try -errwarn=%all,no%E_EMPTY_DECLARATION,
dnl no%E_STATEMENT_NOT_REACHED,no%E_ARGUEMENT_MISMATCH,
dnl no%E_MACRO_REDEFINED (Sun Forte case)
dnl For Forte we need disable "empty declaration" warning produced by un-needed semicolon
dnl "statement not reached" disabled because there is g_assert_not_reached () in some places
dnl "macro redefined" because of gst/gettext.h
dnl FIXME: is it really supposed to be 'ARGUEMENT' and not 'ARGUMENT'?
for f in 'no%E_EMPTY_DECLARATION' \
'no%E_STATEMENT_NOT_REACHED' \
'no%E_ARGUEMENT_MISMATCH' \
'no%E_MACRO_REDEFINED' \
'no%E_LOOP_NOT_ENTERED_AT_TOP'
do
AS_COMPILER_FLAG([-errwarn=%all,$f], [
ERROR_CFLAGS="$ERROR_CFLAGS,$f"
])
done
])
else
dnl Add -fno-strict-aliasing for GLib versions before 2.19.8
dnl as before G_LOCK and friends caused strict aliasing compiler
dnl warnings.
PKG_CHECK_EXISTS([glib-2.0 < 2.19.8], [
AS_COMPILER_FLAG(-fno-strict-aliasing,
ERROR_CFLAGS="$ERROR_CFLAGS -fno-strict-aliasing")
])
fi
fi
if test "x$2" != "x"
then
UNSUPPORTED=""
list="$2"
for each in $list
do
AS_COMPILER_FLAG($each,
WARNING_CFLAGS="$WARNING_CFLAGS $each",
UNSUPPORTED="$UNSUPPORTED $each")
done
if test "X$UNSUPPORTED" != X ; then
AC_MSG_NOTICE([unsupported compiler flags: $UNSUPPORTED])
fi
fi
AC_SUBST(WARNING_CFLAGS)
AC_SUBST(ERROR_CFLAGS)
AC_MSG_NOTICE([set WARNING_CFLAGS to $WARNING_CFLAGS])
AC_MSG_NOTICE([set ERROR_CFLAGS to $ERROR_CFLAGS])
])
dnl Sets WARNING_CXXFLAGS and ERROR_CXXFLAGS to something the compiler
dnl will accept and AC_SUBST them so they are available in Makefile
dnl
dnl WARNING_CXXFLAGS will contain flags to make the compiler emit more
dnl warnings.
dnl ERROR_CXXFLAGS will contain flags to make those warnings fatal,
dnl unless ADD-WERROR is set to "no"
dnl
dnl If MORE_FLAGS is set, tries to add each of the given flags
dnl to WARNING_CFLAGS if the compiler supports them. Each flag is
dnl tested separately.
dnl
dnl These flags can be overridden at make time:
dnl make ERROR_CXXFLAGS=
AC_DEFUN([AG_GST_SET_ERROR_CXXFLAGS],
[
AC_REQUIRE([AC_PROG_CXX])
AC_REQUIRE([AS_CXX_COMPILER_FLAG])
ERROR_CXXFLAGS=""
WARNING_CXXFLAGS=""
dnl if we support -Wall, set it unconditionally
AS_CXX_COMPILER_FLAG(-Wall, WARNING_CXXFLAGS="$WARNING_CXXFLAGS -Wall")
dnl if asked for, add -Werror if supported
if test "x$1" != "xno"
then
AS_CXX_COMPILER_FLAG(-Werror, ERROR_CXXFLAGS="$ERROR_CXXFLAGS -Werror")
if test "x$ERROR_CXXFLAGS" != "x"
then
dnl add exceptions
AS_CXX_COMPILER_FLAG([-Wno-non-virtual-dtor], ERROR_CXXFLAGS="$ERROR_CXXFLAGS -Wno-non-virtual-dtor")
dnl Add -fno-strict-aliasing for GLib versions before 2.19.8
dnl as before G_LOCK and friends caused strict aliasing compiler
dnl warnings.
PKG_CHECK_EXISTS([glib-2.0 < 2.19.8], [
AS_CXX_COMPILER_FLAG([-fno-strict-aliasing],
ERROR_CXXFLAGS="$ERROR_CXXFLAGS -fno-strict-aliasing")
])
else
dnl if -Werror isn't suported, try -errwarn=%all
AS_CXX_COMPILER_FLAG([-errwarn=%all], ERROR_CXXFLAGS="$ERROR_CXXFLAGS -errwarn=%all")
if test "x$ERROR_CXXFLAGS" != "x"; then
dnl try -errwarn=%all,no%E_EMPTY_DECLARATION,
dnl no%E_STATEMENT_NOT_REACHED,no%E_ARGUEMENT_MISMATCH,
dnl no%E_MACRO_REDEFINED (Sun Forte case)
dnl For Forte we need disable "empty declaration" warning produced by un-needed semicolon
dnl "statement not reached" disabled because there is g_assert_not_reached () in some places
dnl "macro redefined" because of gst/gettext.h
dnl FIXME: is it really supposed to be 'ARGUEMENT' and not 'ARGUMENT'?
dnl FIXME: do any of these work with the c++ compiler? if not, why
dnl do we check at all?
for f in 'no%E_EMPTY_DECLARATION' \
'no%E_STATEMENT_NOT_REACHED' \
'no%E_ARGUEMENT_MISMATCH' \
'no%E_MACRO_REDEFINED' \
'no%E_LOOP_NOT_ENTERED_AT_TOP'
do
AS_CXX_COMPILER_FLAG([-errwarn=%all,$f], ERROR_CXXFLAGS="$ERROR_CXXFLAGS,$f")
done
fi
fi
fi
if test "x$2" != "x"
then
UNSUPPORTED=""
list="$2"
for each in $list
do
AS_CXX_COMPILER_FLAG($each,
WARNING_CXXFLAGS="$WARNING_CXXFLAGS $each",
UNSUPPORTED="$UNSUPPORTED $each")
done
if test "X$UNSUPPORTED" != X ; then
AC_MSG_NOTICE([unsupported compiler flags: $UNSUPPORTED])
fi
fi
AC_SUBST(WARNING_CXXFLAGS)
AC_SUBST(ERROR_CXXFLAGS)
AC_MSG_NOTICE([set WARNING_CXXFLAGS to $WARNING_CXXFLAGS])
AC_MSG_NOTICE([set ERROR_CXXFLAGS to $ERROR_CXXFLAGS])
])
dnl Sets the default error level for debugging messages
AC_DEFUN([AG_GST_SET_LEVEL_DEFAULT],
[
dnl define correct errorlevel for debugging messages. We want to have
dnl GST_ERROR messages printed when running cvs builds
if test "x[$1]" = "xyes"; then
GST_LEVEL_DEFAULT=GST_LEVEL_ERROR
else
GST_LEVEL_DEFAULT=GST_LEVEL_NONE
fi
AC_DEFINE_UNQUOTED(GST_LEVEL_DEFAULT, $GST_LEVEL_DEFAULT,
[Default errorlevel to use])
dnl AC_SUBST so we can use it for win32/common/config.h
AC_SUBST(GST_LEVEL_DEFAULT)
])
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