Fix: re-enable compatibility with autoconf < 2.64
authorMathieu Desnoyers <mathieu.desnoyers@efficios.com>
Thu, 14 Jun 2012 04:56:40 +0000 (00:56 -0400)
committerMathieu Desnoyers <mathieu.desnoyers@efficios.com>
Thu, 14 Jun 2012 04:56:40 +0000 (00:56 -0400)
commit450b97095e27646fcd1e4b83c99477d7253b987b
tree63666f79ef92a438a1fbdf6d33e85e23a028a9d0
parente51500edbd9919cee53bc85cbb4b22cd4786fc42
Fix: re-enable compatibility with autoconf < 2.64

> I tried to build the latest urcu (git master e51500) on a Centos 6.2 box, and got:
>
> jscott@dxi0-62:~/src/userspace-rcu$ make -j4
> CDPATH="${ZSH_VERSION+.}:" && cd . && /bin/sh /users/jscott/src/userspace-rcu/config/missing --run aclocal-1.11 -I
> +config
> CDPATH="${ZSH_VERSION+.}:" && cd . && /bin/sh /users/jscott/src/userspace-rcu/config/missing --run autoconf
>  cd . && /bin/sh /users/jscott/src/userspace-rcu/config/missing --run automake-1.11 --foreign
> configure:4010: error: possibly undefined macro: m4_ifnblank
>       If this token and others are legitimate, please use m4_pattern_allow.
>       See the Autoconf documentation.
> make: *** [configure] Error 1
> make: *** Waiting for unfinished jobs....
>
> Some digging showed that the macro m4_ifnblank requires autoconf 2.64. Centos 6.2 has autoconf 2.63. :(
>
> I just worked around it by reverting commit a767fd locally, then I can build fine.

Reported-by: John Steele Scott <toojays@toojays.net>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
config/ax_tls.m4
configure.ac
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