I foolishly assumed that the autoconf macro AC_CHECK_DECLS worked like
most autoconf macros, and did not define HAVE_DECL_xx when the
declaration is not available. However, it turns out that it actually
#defines it to 0. This patch fixes the test of HAVE_DECL_STRNLEN to
match that behaviour. Bootstrapped and ran libbacktrace testsuite on
x86_64-unknown-linux-gnu. Committed to mainline.
Ian
2012-09-18 Ian Lance Taylor <i...@google.com>
* dwarf.c: Correct test of HAVE_DECL_STRNLEN.
Index: dwarf.c
===================================================================
--- dwarf.c (revision 191433)
+++ dwarf.c (working copy)
@@ -44,7 +44,7 @@ POSSIBILITY OF SUCH DAMAGE. */
#include "backtrace.h"
#include "internal.h"
-#ifndef HAVE_DECL_STRNLEN
+#if !defined(HAVE_DECL_STRNLEN) || !HAVE_DECL_STRNLEN
/* The function is defined in libiberty if needed. */
extern size_t strnlen (const char *, size_t);
#endif
