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dnl SU: the following is copied from gnome/compiler-flags.m4: turn on warnings for gcc
dnl
dnl COMPILER_WARNINGS
dnl Turn on many useful compiler warnings
dnl For now, only works on GCC
AC_DEFUN([COMPILER_WARNINGS],[
AC_ARG_ENABLE(compiler-warnings,
[ --enable-compiler-warnings=[no/minimum/yes/maximum]
Turn on compiler warnings],,enable_compiler_warnings=minimum)
AC_MSG_CHECKING(what warning flags to pass to the C compiler)
warnCFLAGS=
if test "x$GCC" != xyes; then
enable_compiler_warnings=no
fi
if test "x$enable_compiler_warnings" != "xno"; then
if test "x$GCC" = "xyes"; then
case " $CFLAGS " in
*[\ \ ]-Wall[\ \ ]*) ;;
*) warnCFLAGS="-W -Wall -Wunused" ;;
esac
## -W is not all that useful. And it cannot be controlled
## with individual -Wno-xxx flags, unlike -Wall
if test "x$enable_compiler_warnings" = "xyes"; then
warnCFLAGS="$warnCFLAGS -pedantic -Wmissing-prototypes -Wmissing-declarations"
elif test "x$enable_compiler_warnings" = "xmaximum"; then
## just turn on about everything:
warnCFLAGS="-Wall -Wunused -Wmissing-prototypes -Wmissing-declarations -Wimplicit -Wparentheses -Wreturn-type -Wswitch -Wtrigraphs -Wunused -Wshadow -Wpointer-arith -Wcast-qual -Wcast-align -Wwrite-strings"
fi
fi
fi
AC_MSG_RESULT($warnCFLAGS)
### FIXME: if we restrict setting the flags to this case only, they will get overridden
### somehwere else further up in the configure process.
if test "x$cflags_set" != "xyes"; then
XTRA_WARN_CFLAGS=$warnCFLAGS
AC_SUBST(XTRA_WARN_CFLAGS)
# CFLAGS="$CFLAGS $warnCFLAGS"
cflags_set=yes
AC_SUBST(cflags_set)
fi
])
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