Hello list,
recent GCC versions default to C99 or even C11. I was expecting that
adding AC_PROG_CC_C89 to configure.ac, would force C89, probably by using
-std=gnu89. But this was not the case. Any ideas why?
Context is compiling a C program using a recent gcc on Solaris 10,
resulted to this error:
/opt/csw/lib/gcc/i386-pc-solaris2.10/5.2.0/include-fixed/sys/feature_tests.h:346:2:
error: #error "Compiler or options invalid for pre-UNIX 03 X/Open
applications and pre-2001 POSIX applications"
From the header file:
#if defined(_STDC_C99) && (defined(__XOPEN_OR_POSIX) && !defined(_XPG6))
#error "Compiler or options invalid for pre-UNIX 03 X/Open applications \
and pre-2001 POSIX applications"
#elif !defined(_STDC_C99) && \
(defined(__XOPEN_OR_POSIX) && defined(_XPG6))
#error "Compiler or options invalid; UNIX 03 and POSIX.1-2001 applications
\
require the use of c99"
#endif
Thank you in advance,
Dimitris
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