[check] Replace compiled symbol visibility checker with shell script.

Behdad Esfahbod objected to the execution of a compiled program to check
symbol visibility as it makes cross-compilation more difficult.

Instead of executing the program, this method conditionally exports
a variable if cairo uses symbol hiding and scans the executable for
that symbol in a similar manner to check-def.sh. This has the slight
advantage of using the Makefile for performing the compilation, rather
than attempting to invoke $(CPP) from a shell script within the test
environment.

1 files changed, 12 insertions, 0 deletions

diff --git a/src/check-has-hidden-symbols.c b/src/check-has-hidden-symbols.c
new file mode 100644
index 000000000..2fb120d87
--- /dev/null
+++ b/src/check-has-hidden-symbols.c
@@ -0,0 +1,12 @@
+#include "cairoint.h"
+
+#if CAIRO_HAS_HIDDEN_SYMBOLS
+extern cairo_public int cairo_has_hidden_symbols;
+int cairo_has_hidden_symbols;
+#endif
+
+int
+main (void)
+{
+    return 0;
+}