Upload Tizen2.0 source

[framework/graphics/cairo.git] / build / configure.ac.warnings

diff --git a/build/configure.ac.warnings b/build/configure.ac.warnings
index 3eb0104..9b9c742 100644 (file)
--- a/build/configure.ac.warnings
+++ b/build/configure.ac.warnings
@@ -21,6 +21,9 @@ MAYBE_WARN="-Wall -Wextra \
 -Wno-missing-field-initializers -Wno-unused-parameter \
 -Wno-attributes -Wno-long-long -Winline"
 
+# -Wunused-but-set-variable is too noisy at present
+NO_WARN="-Wno-unused-but-set-variable"
+
 dnl Sun Studio 12 likes to rag at us for abusing enums like
 dnl having cairo_status_t variables hold cairo_int_status_t
 dnl values.  It's bad, we know.  Now please be quiet.
@@ -29,11 +32,24 @@ MAYBE_WARN="$MAYBE_WARN -erroff=E_ENUM_TYPE_MISMATCH_ARG \
 
 dnl We also abuse the warning-flag facility to enable other compiler
 dnl options.  Namely, the following:
-MAYBE_WARN="$MAYBE_WARN -fno-strict-aliasing -fno-common -flto"
+
+dnl -flto working really needs a test link, not just a compile
+
+safe_MAYBE_WARN="$MAYBE_WARN"
+MAYBE_WARN="$MAYBE_WARN -flto"
+AC_TRY_LINK([],[
+       int main(int argc, char **argv) { return 0; }
+],[],[
+       MAYBE_WARN="$safe_MAYBE_WARN"
+])
+
+MAYBE_WARN="$MAYBE_WARN -fno-strict-aliasing -fno-common"
 
 dnl Also to turn various gcc/glibc-specific preprocessor checks
 MAYBE_WARN="$MAYBE_WARN -Wp,-D_FORTIFY_SOURCE=2"
 
+MAYBE_WARN="$MAYBE_WARN $NO_WARN"
+
 # invalidate cached value if MAYBE_WARN has changed
 if test "x$cairo_cv_warn_maybe" != "x$MAYBE_WARN"; then
        unset cairo_cv_warn_cflags
@@ -84,7 +100,7 @@ AC_DEFINE_UNQUOTED([WARN_UNUSED_RESULT], [$cairo_cv_warn_unused_result],
 
 dnl check linker flags
 AC_CACHE_CHECK([how to allow undefined symbols in shared libraries used by test suite], cairo_cv_test_undefined_ldflags,
-              [CAIRO_CC_TRY_FLAG([-Wl,--allow-shlib-undefined], [],
+              [CAIRO_CC_TRY_FLAG_SILENT([-Wl,--allow-shlib-undefined], [],
                                  [cairo_cv_test_undefined_ldflags="-Wl,--allow-shlib-undefined]")])
 CAIRO_TEST_UNDEFINED_LDFLAGS="$cairo_cv_test_undefined_ldflags"
 AC_SUBST(CAIRO_TEST_UNDEFINED_LDFLAGS)