+sinclude(../config/acx.m4)
+sinclude(../config/no-executables.m4)
+sinclude(../config/override.m4)
+sinclude(../config/warnings.m4)
+
dnl See whether strncmp reads past the end of its string parameters.
dnl On some versions of SunOS4 at least, strncmp reads a word at a time
dnl but erroneously reads past the end of strings. This can cause
p = (char *) mmap (0, MAP_LEN, PROT_READ|PROT_WRITE,
MAP_ANON|MAP_PRIVATE, dev_zero, 0);
if (p == (char *)-1)
+ p = (char *) mmap (0, MAP_LEN, PROT_READ|PROT_WRITE,
+ MAP_ANON|MAP_PRIVATE, -1, 0);
+ if (p == (char *)-1)
exit (2);
else
{
ac_cv_func_strncmp_works=no)
rm -f core core.* *.core])
if test $ac_cv_func_strncmp_works = no ; then
- LIBOBJS="$LIBOBJS strncmp.o"
+ AC_LIBOBJ([strncmp])
fi
])
[Define if errno must be declared even when <errno.h> is included.])
fi
])
+
+dnl See whether we need a declaration for a function.
+AC_DEFUN(libiberty_NEED_DECLARATION,
+[AC_MSG_CHECKING([whether $1 must be declared])
+AC_CACHE_VAL(libiberty_cv_decl_needed_$1,
+[AC_TRY_COMPILE([
+#include "confdefs.h"
+#include <stdio.h>
+#ifdef HAVE_STRING_H
+#include <string.h>
+#else
+#ifdef HAVE_STRINGS_H
+#include <strings.h>
+#endif
+#endif
+#ifdef HAVE_STDLIB_H
+#include <stdlib.h>
+#endif
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif],
+[char *(*pfn) = (char *(*)) $1],
+libiberty_cv_decl_needed_$1=no, libiberty_cv_decl_needed_$1=yes)])
+AC_MSG_RESULT($libiberty_cv_decl_needed_$1)
+if test $libiberty_cv_decl_needed_$1 = yes; then
+ AC_DEFINE([NEED_DECLARATION_]translit($1, [a-z], [A-Z]), 1,
+ [Define if $1 is not declared in system header files.])
+fi
+])dnl
+
+# We always want a C version of alloca() compiled into libiberty,
+# because native-compiler support for the real alloca is so !@#$%
+# unreliable that GCC has decided to use it only when being compiled
+# by GCC. This is the part of AC_FUNC_ALLOCA that calculates the
+# information alloca.c needs.
+AC_DEFUN(libiberty_AC_FUNC_C_ALLOCA,
+[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,
+ [Define to one of _getb67, GETB67, getb67 for Cray-2 and Cray-YMP
+ systems. This function is required for alloca.c support on those
+ systems.]) break])
+ done
+fi
+
+AC_CACHE_CHECK(stack direction for C alloca, ac_cv_c_stack_direction,
+[AC_TRY_RUN([find_stack_direction ()
+{
+ static char *addr = 0;
+ auto char dummy;
+ if (addr == 0)
+ {
+ addr = &dummy;
+ return find_stack_direction ();
+ }
+ else
+ return (&dummy > addr) ? 1 : -1;
+}
+main ()
+{
+ exit (find_stack_direction() < 0);
+}],
+ ac_cv_c_stack_direction=1,
+ ac_cv_c_stack_direction=-1,
+ ac_cv_c_stack_direction=0)])
+AC_DEFINE_UNQUOTED(STACK_DIRECTION, $ac_cv_c_stack_direction,
+ [Define if you know the direction of stack growth for your system;
+ otherwise it will be automatically deduced at run-time.
+ STACK_DIRECTION > 0 => grows toward higher addresses
+ STACK_DIRECTION < 0 => grows toward lower addresses
+ STACK_DIRECTION = 0 => direction of growth unknown])
+])
+
+# AC_LANG_FUNC_LINK_TRY(C)(FUNCTION)
+# ----------------------------------
+# Don't include <ctype.h> because on OSF/1 3.0 it includes
+# <sys/types.h> which includes <sys/select.h> which contains a
+# prototype for select. Similarly for bzero.
+#
+# This test used to merely assign f=$1 in main(), but that was
+# optimized away by HP unbundled cc A.05.36 for ia64 under +O3,
+# presumably on the basis that there's no need to do that store if the
+# program is about to exit. Conversely, the AIX linker optimizes an
+# unused external declaration that initializes f=$1. So this test
+# program has both an external initialization of f, and a use of f in
+# main that affects the exit status.
+#
+m4_define([AC_LANG_FUNC_LINK_TRY(C)],
+[AC_LANG_PROGRAM(
+[/* System header to define __stub macros and hopefully few prototypes,
+ which can conflict with char $1 (); below.
+ Prefer <limits.h> to <assert.h> if __STDC__ is defined, since
+ <limits.h> exists even on freestanding compilers. Under hpux,
+ including <limits.h> includes <sys/time.h> and causes problems
+ checking for functions defined therein. */
+#if defined (__STDC__) && !defined (_HPUX_SOURCE)
+# include <limits.h>
+#else
+# include <assert.h>
+#endif
+/* Override any gcc2 internal prototype to avoid an error. */
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+/* We use char because int might match the return type of a gcc2
+ builtin and then its argument prototype would still apply. */
+char $1 ();
+/* The GNU C library defines this for functions which it implements
+ to always fail with ENOSYS. Some functions are actually named
+ something starting with __ and the normal name is an alias. */
+#if defined (__stub_$1) || defined (__stub___$1)
+choke me
+#else
+char (*f) () = $1;
+#endif
+#ifdef __cplusplus
+}
+#endif
+], [return f != $1;])])
+