[check] Skip def/plt tests if the compiler doesn't support symbol hiding.

Compile a trivial program such that it reports whether cairo is hiding
its internal symbols and skip the tests that depend upon it.

This prevents false errors, such as bug 12726, where the user is
presented with a scary make check failure.

5 files changed, 24 insertions, 0 deletions

diff --git a/src/Makefile.am b/src/Makefile.am
index 5986334b..f3657c84 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -320,6 +320,11 @@ TESTS_ENVIRONMENT = srcdir="$(srcdir)" MAKE="$(MAKE)"
 TESTS = check-def.sh check-plt.sh check-headers.sh check-cairoint.sh
 EXTRA_DIST += $(TESTS)
 
+check-def.sh check-plt.sh: compiler-supports-visibility$(EXEEXT)
+EXTRA_PROGRAMS = compiler-supports-visibility
+CLEANFILES += $(EXTRA_PROGRAMS)
+compiler_supports_visibility_CFLAGS = -I$(srcdir) $(CAIRO_CFLAGS)
+
 SPARSE = sparse
 sparse:
 	@status=true; for f in $(libcairo_la_base_sources); do \
diff --git a/src/cairo-compiler-private.h b/src/cairo-compiler-private.h
index da80b89e..14aef47d 100644
--- a/src/cairo-compiler-private.h
+++ b/src/cairo-compiler-private.h
@@ -72,10 +72,13 @@ CAIRO_BEGIN_DECLS
 /* slim_internal.h */
 #if (__GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 3)) && defined(__ELF__) && !defined(__sun)
 #define cairo_private_no_warn	__attribute__((__visibility__("hidden")))
+#define CAIRO_HAS_HIDDEN_SYMBOLS 1
 #elif defined(__SUNPRO_C) && (__SUNPRO_C >= 0x550)
 #define cairo_private_no_warn	__hidden
+#define CAIRO_HAS_HIDDEN_SYMBOLS 1
 #else /* not gcc >= 3.3 and not Sun Studio >= 8 */
 #define cairo_private_no_warn
+#define CAIRO_HAS_HIDDEN_SYMBOLS 0
 #endif
 
 #ifndef WARN_UNUSED_RESULT
diff --git a/src/check-def.sh b/src/check-def.sh
index 58408efa..a2e736a3 100755
--- a/src/check-def.sh
+++ b/src/check-def.sh
@@ -2,6 +2,11 @@
 
 LANG=C
 
+if ! ./compiler-supports-visibility; then
+	echo "Compiler doesn't support symbol visibility; skipping test"
+	exit 0
+fi
+
 if ! which nm 2>/dev/null >/dev/null; then
 	echo "'nm' not found; skipping test"
 	exit 0
diff --git a/src/check-plt.sh b/src/check-plt.sh
index 887370c6..05cde35f 100755
--- a/src/check-plt.sh
+++ b/src/check-plt.sh
@@ -4,6 +4,11 @@ LANG=C
 
 status=0
 
+if ! ./compiler-supports-visibility; then
+	echo "Compiler doesn't support symbol visibility; skipping test"
+	exit 0
+fi
+
 if ! which readelf 2>/dev/null >/dev/null; then
 	echo "'readelf' not found; skipping test"
 	exit 0
diff --git a/src/compiler-supports-visibility.c b/src/compiler-supports-visibility.c
new file mode 100644
index 00000000..488c97c2
--- /dev/null
+++ b/src/compiler-supports-visibility.c
@@ -0,0 +1,6 @@
+#include "cairoint.h"
+
+int main (void)
+{
+    return ! CAIRO_HAS_HIDDEN_SYMBOLS;
+}