configure expands
AC_DEFINE(_POSIX_C_SOURCE, 200112L, Define to activate features from
IEEE Stds 1003.1-2001)

to

#define _POSIX_C_SOURCE 200112L

that causes problems because _POSIX_C_SOURCE is defined by system
headers and I get hideous
warnings during compilation.

I tried to fix it by adding AC_UNDEFINE(_POSIX_C_SOURCE);
before AC_DEFINE but autoconf 2.59 won't take it:

configure.in:273: error: possibly undefined macro: AC_UNDEFINE
If this token and others are legitimate, please use
m4_pattern_allow.
See the Autoconf documentation.

Ideas?

sndive@gmail.com wrote:

configure expands
AC_DEFINE(_POSIX_C_SOURCE, 200112L, Define to activate features from
IEEE Stds 1003.1-2001)
>
to
>
#define _POSIX_C_SOURCE 200112L
>
that causes problems because _POSIX_C_SOURCE is defined by system
headers and I get hideous
warnings during compilation.
>
I tried to fix it by adding AC_UNDEFINE(_POSIX_C_SOURCE);
before AC_DEFINE but autoconf 2.59 won't take it:
>
configure.in:273: error: possibly undefined macro: AC_UNDEFINE
If this token and others are legitimate, please use
m4_pattern_allow.
See the Autoconf documentation.
>
Ideas?

It looks like AC_DEFINE is #define'd but AC_UNDEFINE isn't.

Try:

#undef _POSIX_C_SOURCE

instead.

sndive@gmail.com schrieb:

configure.in:273: error: possibly undefined macro: AC_UNDEFINE
If this token and others are legitimate, please use
m4_pattern_allow.
See the Autoconf documentation.
>
Ideas?

RTFM (autoconf documentation, in this case). There is no AC_UNDEFINE.

Regards,
Martin