diff options
| author | Doug VanLeuven <roamdad@sonic.net> | 2012-12-14 14:58:30 +0200 |
|---|---|---|
| committer | David Lamparter <equinox@opensourcerouting.org> | 2013-01-11 21:50:06 +0100 |
| commit | 327c4cdf7578debcc140f04f03d02479771c9e11 (patch) | |
| tree | a0e02a0614f12601d8a58eeeebf9e54b27198c9f /configure.ac | |
| parent | b2e5bdbe10c4145f508fcf1486ffe29d5ce516f7 (diff) | |
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 <equinox@opensourcerouting.org>
Diffstat (limited to 'configure.ac')
| -rwxr-xr-x | configure.ac | 16 |
1 files changed, 16 insertions, 0 deletions
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 --------------------------- |