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 $ac_cv_func_strncmp_works = no ; then LIBOBJS="$LIBOBJS strncmp.o" 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 ]) # FIXME: We temporarily define our own version of AC_PROG_CC. This is # copied from autoconf 2.12, but does not call AC_PROG_CC_WORKS. We # are probably using a cross compiler, which will not be able to fully # link an executable. This should really be fixed in autoconf # itself. AC_DEFUN(LIB_AC_PROG_CC, [AC_BEFORE([$0], [AC_PROG_CPP])dnl AC_PROVIDE([AC_PROG_CC]) AC_CHECK_PROG(CC, gcc, gcc) if test -z "$CC"; then AC_CHECK_PROG(CC, cc, cc, , , /usr/ucb/cc) test -z "$CC" && AC_MSG_ERROR([no acceptable cc found in \$PATH]) fi AC_PROG_CC_GNU if test $ac_cv_prog_gcc = yes; then GCC=yes ac_libiberty_warn_cflags='-W -Wall -Wtraditional -pedantic' dnl Check whether -g works, even if CFLAGS is set, in case the package dnl plays around with CFLAGS (such as to build both debugging and dnl normal versions of a library), tasteless as that idea is. ac_test_CFLAGS="${CFLAGS+set}" ac_save_CFLAGS="$CFLAGS" CFLAGS= AC_PROG_CC_G if test "$ac_test_CFLAGS" = set; then CFLAGS="$ac_save_CFLAGS" elif test $ac_cv_prog_cc_g = yes; then CFLAGS="-g -O2" else CFLAGS="-O2" fi else GCC= ac_libiberty_warn_cflags= test "${CFLAGS+set}" = set || CFLAGS="-g" fi AC_SUBST(ac_libiberty_warn_cflags) ]) # Work around a bug in autoheader. This can go away when we switch to # autoconf >2.50. The use of define instead of AC_DEFUN is # deliberate. define(AC_DEFINE_NOAUTOHEADER, [cat >> confdefs.h <<\EOF [#define] $1 ifelse($#, 2, [$2], $#, 3, [$2], 1) EOF ]) # We always want a C version of alloca() compiled into libiberty, # because native-compiler support for the real alloca is so !@#$% # 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]) ])