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AC_DEFUN([MYSQL_FUNC_ALLOCA],
[
# Since we have heard that alloca fails on IRIX never define it on a
# SGI machine
if test ! "$host_vendor" = "sgi"
then
AC_REQUIRE_CPP()dnl Set CPP; we run AC_EGREP_CPP conditionally.
# The Ultrix 4.2 mips builtin alloca declared by alloca.h only works
# for constant arguments. Useless!
AC_CACHE_CHECK([for working alloca.h], ac_cv_header_alloca_h,
[AC_TRY_LINK([#include <alloca.h>], [char *p = alloca(2 * sizeof(int));],
ac_cv_header_alloca_h=yes, ac_cv_header_alloca_h=no)])
if test "$ac_cv_header_alloca_h" = "yes"
then
AC_DEFINE(HAVE_ALLOCA, 1)
fi
AC_CACHE_CHECK([for alloca], ac_cv_func_alloca_works,
[AC_TRY_LINK([
#ifdef __GNUC__
# define alloca __builtin_alloca
#else
# if HAVE_ALLOCA_H
# include <alloca.h>
# else
# ifdef _AIX
#pragma alloca
# else
# ifndef alloca /* predefined by HP cc +Olibcalls */
char *alloca ();
# endif
# endif
# endif
#endif
], [char *p = (char *) alloca(1);],
ac_cv_func_alloca_works=yes, ac_cv_func_alloca_works=no)])
if test "$ac_cv_func_alloca_works" = "yes"; then
AC_DEFINE([HAVE_ALLOCA], [1], [If we have a working alloca() implementation])
fi
if test "$ac_cv_func_alloca_works" = "no"; then
# The SVR3 libPW and SVR4 libucb both contain incompatible functions
# that cause trouble. Some versions do not even contain alloca or
# contain a buggy version. If you still want to use their alloca,
# use ar to extract alloca.o from them instead of compiling alloca.c.
ALLOCA=alloca.o
AC_DEFINE(C_ALLOCA, 1)
AC_CACHE_CHECK(whether alloca needs Cray hooks, ac_cv_os_cray,
[AC_EGREP_CPP(webecray,
[#if defined(CRAY) && ! defined(CRAY2)
webecray
#else
wenotbecray
#endif
], ac_cv_os_cray=yes, ac_cv_os_cray=no)])
if test "$ac_cv_os_cray" = "yes"; then
for ac_func in _getb67 GETB67 getb67; do
AC_CHECK_FUNC($ac_func, [AC_DEFINE_UNQUOTED(CRAY_STACKSEG_END, $ac_func)
break])
done
fi
fi
AC_SUBST(ALLOCA)dnl
else
AC_MSG_RESULT("Skipped alloca tests")
fi
])
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