Mercurial > hg > CbC > CbC_gcc
diff libiberty/aclocal.m4 @ 0:a06113de4d67
first commit
author | kent <kent@cr.ie.u-ryukyu.ac.jp> |
---|---|
date | Fri, 17 Jul 2009 14:47:48 +0900 |
parents | |
children | f6334be47118 |
line wrap: on
line diff
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/libiberty/aclocal.m4 Fri Jul 17 14:47:48 2009 +0900 @@ -0,0 +1,223 @@ +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 +dnl a SEGV in some cases. +AC_DEFUN(libiberty_AC_FUNC_STRNCMP, +[AC_REQUIRE([AC_FUNC_MMAP]) +AC_CACHE_CHECK([for working strncmp], ac_cv_func_strncmp_works, +[AC_TRY_RUN([ +/* Test by Jim Wilson and Kaveh Ghazi. + Check whether strncmp reads past the end of its string parameters. */ +#include <sys/types.h> + +#ifdef HAVE_FCNTL_H +#include <fcntl.h> +#endif + +#ifdef HAVE_SYS_MMAN_H +#include <sys/mman.h> +#endif + +#ifndef MAP_ANON +#ifdef MAP_ANONYMOUS +#define MAP_ANON MAP_ANONYMOUS +#else +#define MAP_ANON MAP_FILE +#endif +#endif + +#ifndef MAP_FILE +#define MAP_FILE 0 +#endif +#ifndef O_RDONLY +#define O_RDONLY 0 +#endif + +#define MAP_LEN 0x10000 + +main () +{ +#if defined(HAVE_MMAP) || defined(HAVE_MMAP_ANYWHERE) + char *p; + int dev_zero; + + dev_zero = open ("/dev/zero", O_RDONLY); + if (dev_zero < 0) + exit (1); + + 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 + { + char *string = "__si_type_info"; + char *q = (char *) p + MAP_LEN - strlen (string) - 2; + char *r = (char *) p + 0xe; + + strcpy (q, string); + strcpy (r, string); + strncmp (r, q, 14); + } +#endif /* HAVE_MMAP || HAVE_MMAP_ANYWHERE */ + exit (0); +} +], ac_cv_func_strncmp_works=yes, ac_cv_func_strncmp_works=no, + ac_cv_func_strncmp_works=no) +rm -f core core.* *.core]) +if test $ac_cv_func_strncmp_works = no ; then + AC_LIBOBJ([strncmp]) +fi +]) + +dnl See if errno must be declared even when <errno.h> is included. +AC_DEFUN(libiberty_AC_DECLARE_ERRNO, +[AC_CACHE_CHECK(whether errno must be declared, libiberty_cv_declare_errno, +[AC_TRY_COMPILE( +[#include <errno.h>], +[int x = errno;], +libiberty_cv_declare_errno=no, +libiberty_cv_declare_errno=yes)]) +if test $libiberty_cv_declare_errno = yes +then AC_DEFINE(NEED_DECLARATION_ERRNO, 1, + [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;])]) +