From 327c4cdf7578debcc140f04f03d02479771c9e11 Mon Sep 17 00:00:00 2001 From: Doug VanLeuven Date: Fri, 14 Dec 2012 14:58:30 +0200 Subject: testzebra: pragma weak: detect systems with weak alias and provide alternative LLVM clang does not support #pragma weak (bug 3679) on OS X. There are other systems where the #pragma weak has varying syntax. Added m4 file from the autoconf archives: http://www.gnu.org/software/autoconf-archive/ax_sys_weak_alias.html Fix up zebra/*_null.c files to use #pragma weak alias or stub functions if not available. It's incomplete in that the different format #pragma enable easier fixes on need. Tested on 64bit OS X 10.7, FreeBSD 9.0 amd64 & i386 (32bit) using gcc & clang. Tested on linux 64bit. Signed-off-by: David Lamparter --- configure.ac | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) (limited to 'configure.ac') diff --git a/configure.ac b/configure.ac index 405693c9..c51a0d3e 100755 --- a/configure.ac +++ b/configure.ac @@ -1540,6 +1540,22 @@ if test "${enable_capabilities}" != "no"; then fi AC_SUBST(LIBCAP) +dnl --------------------------------------------------------------------------- +dnl http://www.gnu.org/software/autoconf-archive/ax_sys_weak_alias.html +dnl Check for and set one of the following = 1 +dnl HAVE_SYS_WEAK_ALIAS_ATTRIBUTE +dnl HAVE_SYS_WEAK_ALIAS_PRAGMA +dnl HAVE_SYS_WEAK_ALIAS_HPSECONDARY +dnl HAVE_SYS_WEAK_ALIAS_CRIDUPLICATE +dnl If any scheme is found, set +dnl HAVE_SYS_WEAK_ALIAS=1 +dnl The following variable is set to text value +dnl WEAK_ALIAS = "attribute" || "pragma" || "hpsecondary" || "criduplicate" || "no" +dnl If weak alias can cross object file boundaries +dnl WEAK_ALIAS_CROSSFILE = "yes" || "no" +dnl --------------------------------------------------------------------------- +AX_SYS_WEAK_ALIAS + dnl --------------------------- dnl check for glibc 'backtrace' dnl --------------------------- -- cgit v1.2.1