1 sinclude(../config/accross.m4)
3 dnl See whether strncmp reads past the end of its string parameters.
4 dnl On some versions of SunOS4 at least, strncmp reads a word at a time
5 dnl but erroneously reads past the end of strings. This can cause
6 dnl a SEGV in some cases.
7 AC_DEFUN(libiberty_AC_FUNC_STRNCMP,
8 [AC_REQUIRE([AC_FUNC_MMAP])
9 AC_CACHE_CHECK([for working strncmp], ac_cv_func_strncmp_works,
11 /* Test by Jim Wilson and Kaveh Ghazi.
12 Check whether strncmp reads past the end of its string parameters. */
13 #include <sys/types.h>
19 #ifdef HAVE_SYS_MMAN_H
25 #define MAP_ANON MAP_ANONYMOUS
27 #define MAP_ANON MAP_FILE
38 #define MAP_LEN 0x10000
42 #if defined(HAVE_MMAP) || defined(HAVE_MMAP_ANYWHERE)
46 dev_zero = open ("/dev/zero", O_RDONLY);
50 p = (char *) mmap (0, MAP_LEN, PROT_READ|PROT_WRITE,
51 MAP_ANON|MAP_PRIVATE, dev_zero, 0);
53 p = (char *) mmap (0, MAP_LEN, PROT_READ|PROT_WRITE,
54 MAP_ANON|MAP_PRIVATE, -1, 0);
59 char *string = "__si_type_info";
60 char *q = (char *) p + MAP_LEN - strlen (string) - 2;
61 char *r = (char *) p + 0xe;
67 #endif /* HAVE_MMAP || HAVE_MMAP_ANYWHERE */
70 ], ac_cv_func_strncmp_works=yes, ac_cv_func_strncmp_works=no,
71 ac_cv_func_strncmp_works=no)
72 rm -f core core.* *.core])
73 if test $ac_cv_func_strncmp_works = no ; then
74 LIBOBJS="$LIBOBJS strncmp.o"
78 dnl See if errno must be declared even when <errno.h> is included.
79 AC_DEFUN(libiberty_AC_DECLARE_ERRNO,
80 [AC_CACHE_CHECK(whether errno must be declared, libiberty_cv_declare_errno,
84 libiberty_cv_declare_errno=no,
85 libiberty_cv_declare_errno=yes)])
86 if test $libiberty_cv_declare_errno = yes
87 then AC_DEFINE(NEED_DECLARATION_ERRNO, 1,
88 [Define if errno must be declared even when <errno.h> is included.])
92 dnl See whether we need a declaration for a function.
93 AC_DEFUN(libiberty_NEED_DECLARATION,
94 [AC_MSG_CHECKING([whether $1 must be declared])
95 AC_CACHE_VAL(libiberty_cv_decl_needed_$1,
102 #ifdef HAVE_STRINGS_H
112 [char *(*pfn) = (char *(*)) $1],
113 libiberty_cv_decl_needed_$1=no, libiberty_cv_decl_needed_$1=yes)])
114 AC_MSG_RESULT($libiberty_cv_decl_needed_$1)
115 if test $libiberty_cv_decl_needed_$1 = yes; then
116 AC_DEFINE([NEED_DECLARATION_]translit($1, [a-z], [A-Z]), 1,
117 [Define if $1 is not declared in system header files.])
121 # FIXME: We temporarily define our own version of AC_PROG_CC. This is
122 # copied from autoconf 2.12, but does not call AC_PROG_CC_WORKS. We
123 # are probably using a cross compiler, which will not be able to fully
124 # link an executable. This should really be fixed in autoconf
127 AC_DEFUN(LIB_AC_PROG_CC,
128 [AC_BEFORE([$0], [AC_PROG_CPP])dnl
129 AC_PROVIDE([AC_PROG_CC])
130 AC_CHECK_PROG(CC, gcc, gcc)
131 if test -z "$CC"; then
132 AC_CHECK_PROG(CC, cc, cc, , , /usr/ucb/cc)
133 test -z "$CC" && AC_MSG_ERROR([no acceptable cc found in \$PATH])
138 if test $ac_cv_prog_gcc = yes; then
140 ac_libiberty_warn_cflags='-W -Wall -Wtraditional -pedantic'
141 dnl Check whether -g works, even if CFLAGS is set, in case the package
142 dnl plays around with CFLAGS (such as to build both debugging and
143 dnl normal versions of a library), tasteless as that idea is.
144 ac_test_CFLAGS="${CFLAGS+set}"
145 ac_save_CFLAGS="$CFLAGS"
148 if test "$ac_test_CFLAGS" = set; then
149 CFLAGS="$ac_save_CFLAGS"
150 elif test $ac_cv_prog_cc_g = yes; then
157 ac_libiberty_warn_cflags=
158 test "${CFLAGS+set}" = set || CFLAGS="-g"
160 AC_SUBST(ac_libiberty_warn_cflags)
163 # Work around a bug in autoheader. This can go away when we switch to
164 # autoconf >2.50. The use of define instead of AC_DEFUN is
166 define(AC_DEFINE_NOAUTOHEADER,
167 [cat >> confdefs.h <<\EOF
168 [#define] $1 ifelse($#, 2, [$2], $#, 3, [$2], 1)
172 # We always want a C version of alloca() compiled into libiberty,
173 # because native-compiler support for the real alloca is so !@#$%
174 # unreliable that GCC has decided to use it only when being compiled
175 # by GCC. This is the part of AC_FUNC_ALLOCA that calculates the
176 # information alloca.c needs.
177 AC_DEFUN(libiberty_AC_FUNC_C_ALLOCA,
178 [AC_CACHE_CHECK(whether alloca needs Cray hooks, ac_cv_os_cray,
179 [AC_EGREP_CPP(webecray,
180 [#if defined(CRAY) && ! defined(CRAY2)
185 ], ac_cv_os_cray=yes, ac_cv_os_cray=no)])
186 if test $ac_cv_os_cray = yes; then
187 for ac_func in _getb67 GETB67 getb67; do
188 AC_CHECK_FUNC($ac_func,
189 [AC_DEFINE_UNQUOTED(CRAY_STACKSEG_END, $ac_func,
190 [Define to one of _getb67, GETB67, getb67 for Cray-2 and Cray-YMP
191 systems. This function is required for alloca.c support on those
196 AC_CACHE_CHECK(stack direction for C alloca, ac_cv_c_stack_direction,
197 [AC_TRY_RUN([find_stack_direction ()
199 static char *addr = 0;
204 return find_stack_direction ();
207 return (&dummy > addr) ? 1 : -1;
211 exit (find_stack_direction() < 0);
213 ac_cv_c_stack_direction=1,
214 ac_cv_c_stack_direction=-1,
215 ac_cv_c_stack_direction=0)])
216 AC_DEFINE_UNQUOTED(STACK_DIRECTION, $ac_cv_c_stack_direction,
217 [Define if you know the direction of stack growth for your system;
218 otherwise it will be automatically deduced at run-time.
219 STACK_DIRECTION > 0 => grows toward higher addresses
220 STACK_DIRECTION < 0 => grows toward lower addresses
221 STACK_DIRECTION = 0 => direction of growth unknown])