1 sinclude(../config/acx.m4)
2 sinclude(../config/cet.m4)
3 sinclude(../config/enable.m4)
4 sinclude(../config/gcc-plugin.m4)
5 sinclude(../config/no-executables.m4)
6 sinclude(../config/override.m4)
7 sinclude(../config/picflag.m4)
8 sinclude(../config/warnings.m4)
10 dnl See whether strncmp reads past the end of its string parameters.
11 dnl On some versions of SunOS4 at least, strncmp reads a word at a time
12 dnl but erroneously reads past the end of strings. This can cause
13 dnl a SEGV in some cases.
14 AC_DEFUN(libiberty_AC_FUNC_STRNCMP,
15 [AC_REQUIRE([AC_FUNC_MMAP])
16 AC_CACHE_CHECK([for working strncmp], ac_cv_func_strncmp_works,
18 /* Test by Jim Wilson and Kaveh Ghazi.
19 Check whether strncmp reads past the end of its string parameters. */
20 #include <sys/types.h>
26 #ifdef HAVE_SYS_MMAN_H
32 #define MAP_ANON MAP_ANONYMOUS
34 #define MAP_ANON MAP_FILE
45 #define MAP_LEN 0x10000
49 #if defined(HAVE_MMAP) || defined(HAVE_MMAP_ANYWHERE)
53 dev_zero = open ("/dev/zero", O_RDONLY);
57 p = (char *) mmap (0, MAP_LEN, PROT_READ|PROT_WRITE,
58 MAP_ANON|MAP_PRIVATE, dev_zero, 0);
60 p = (char *) mmap (0, MAP_LEN, PROT_READ|PROT_WRITE,
61 MAP_ANON|MAP_PRIVATE, -1, 0);
66 char *string = "__si_type_info";
67 char *q = (char *) p + MAP_LEN - strlen (string) - 2;
68 char *r = (char *) p + 0xe;
74 #endif /* HAVE_MMAP || HAVE_MMAP_ANYWHERE */
77 ], ac_cv_func_strncmp_works=yes, ac_cv_func_strncmp_works=no,
78 ac_cv_func_strncmp_works=yes)
79 rm -f core core.* *.core])
80 if test $ac_cv_func_strncmp_works = no ; then
85 dnl See if errno must be declared even when <errno.h> is included.
86 AC_DEFUN(libiberty_AC_DECLARE_ERRNO,
87 [AC_CACHE_CHECK(whether errno must be declared, libiberty_cv_declare_errno,
91 libiberty_cv_declare_errno=no,
92 libiberty_cv_declare_errno=yes)])
93 if test $libiberty_cv_declare_errno = yes
94 then AC_DEFINE(NEED_DECLARATION_ERRNO, 1,
95 [Define if errno must be declared even when <errno.h> is included.])
99 dnl See whether we need a declaration for a function.
100 AC_DEFUN(libiberty_NEED_DECLARATION,
101 [AC_MSG_CHECKING([whether $1 must be declared])
102 AC_CACHE_VAL(libiberty_cv_decl_needed_$1,
104 #include "confdefs.h"
109 #ifdef HAVE_STRINGS_H
119 [char *(*pfn) = (char *(*)) $1],
120 libiberty_cv_decl_needed_$1=no, libiberty_cv_decl_needed_$1=yes)])
121 AC_MSG_RESULT($libiberty_cv_decl_needed_$1)
122 if test $libiberty_cv_decl_needed_$1 = yes; then
123 AC_DEFINE([NEED_DECLARATION_]translit($1, [a-z], [A-Z]), 1,
124 [Define if $1 is not declared in system header files.])
128 # We always want a C version of alloca() compiled into libiberty,
129 # because native-compiler support for the real alloca is so !@#$%
130 # unreliable that GCC has decided to use it only when being compiled
131 # by GCC. This is the part of AC_FUNC_ALLOCA that calculates the
132 # information alloca.c needs.
133 AC_DEFUN(libiberty_AC_FUNC_C_ALLOCA,
134 [AC_CACHE_CHECK(whether alloca needs Cray hooks, ac_cv_os_cray,
135 [AC_EGREP_CPP(webecray,
136 [#if defined(CRAY) && ! defined(CRAY2)
141 ], ac_cv_os_cray=yes, ac_cv_os_cray=no)])
142 if test $ac_cv_os_cray = yes; then
143 for ac_func in _getb67 GETB67 getb67; do
144 AC_CHECK_FUNC($ac_func,
145 [AC_DEFINE_UNQUOTED(CRAY_STACKSEG_END, $ac_func,
146 [Define to one of _getb67, GETB67, getb67 for Cray-2 and Cray-YMP
147 systems. This function is required for alloca.c support on those
152 AC_CACHE_CHECK(stack direction for C alloca, ac_cv_c_stack_direction,
153 [AC_TRY_RUN([find_stack_direction ()
155 static char *addr = 0;
160 return find_stack_direction ();
163 return (&dummy > addr) ? 1 : -1;
167 exit (find_stack_direction() < 0);
169 ac_cv_c_stack_direction=1,
170 ac_cv_c_stack_direction=-1,
171 ac_cv_c_stack_direction=0)])
172 AC_DEFINE_UNQUOTED(STACK_DIRECTION, $ac_cv_c_stack_direction,
173 [Define if you know the direction of stack growth for your system;
174 otherwise it will be automatically deduced at run-time.
175 STACK_DIRECTION > 0 => grows toward higher addresses
176 STACK_DIRECTION < 0 => grows toward lower addresses
177 STACK_DIRECTION = 0 => direction of growth unknown])