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