137 lines
3.5 KiB
Plaintext
137 lines
3.5 KiB
Plaintext
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dnl See whether strncmp reads past the end of its string parameters.
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dnl On some versions of SunOS4 at least, strncmp reads a word at a time
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dnl but erroneously reads past the end of strings. This can cause
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dnl a SEGV in some cases.
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AC_DEFUN(libiberty_AC_FUNC_STRNCMP,
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[AC_REQUIRE([AC_FUNC_MMAP])
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AC_CACHE_CHECK([for working strncmp], ac_cv_func_strncmp_works,
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[AC_TRY_RUN([
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/* Test by Jim Wilson and Kaveh Ghazi.
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Check whether strncmp reads past the end of its string parameters. */
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#include <sys/types.h>
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#ifdef HAVE_FCNTL_H
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#include <fcntl.h>
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#endif
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#ifdef HAVE_SYS_MMAN_H
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#include <sys/mman.h>
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#endif
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#ifndef MAP_ANON
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#ifdef MAP_ANONYMOUS
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#define MAP_ANON MAP_ANONYMOUS
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#else
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#define MAP_ANON MAP_FILE
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#endif
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#endif
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#ifndef MAP_FILE
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#define MAP_FILE 0
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#endif
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#ifndef O_RDONLY
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#define O_RDONLY 0
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#endif
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#define MAP_LEN 0x10000
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main ()
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{
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#if defined(HAVE_MMAP) || defined(HAVE_MMAP_ANYWHERE)
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char *p;
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int dev_zero;
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dev_zero = open ("/dev/zero", O_RDONLY);
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if (dev_zero < 0)
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exit (1);
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p = (char *) mmap (0, MAP_LEN, PROT_READ|PROT_WRITE,
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MAP_ANON|MAP_PRIVATE, dev_zero, 0);
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if (p == (char *)-1)
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exit (2);
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else
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{
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char *string = "__si_type_info";
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char *q = (char *) p + MAP_LEN - strlen (string) - 2;
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char *r = (char *) p + 0xe;
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strcpy (q, string);
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strcpy (r, string);
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strncmp (r, q, 14);
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}
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#endif /* HAVE_MMAP || HAVE_MMAP_ANYWHERE */
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exit (0);
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}
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], ac_cv_func_strncmp_works=yes, ac_cv_func_strncmp_works=no,
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ac_cv_func_strncmp_works=no)
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rm -f core core.* *.core])
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if test $ac_cv_func_strncmp_works = no ; then
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LIBOBJS="$LIBOBJS strncmp.o"
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fi
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])
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dnl See if errno must be declared even when <errno.h> is included.
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AC_DEFUN(libiberty_AC_DECLARE_ERRNO,
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[AC_CACHE_CHECK(whether errno must be declared, libiberty_cv_declare_errno,
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[AC_TRY_COMPILE(
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[#include <errno.h>],
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[int x = errno;],
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libiberty_cv_declare_errno=no,
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libiberty_cv_declare_errno=yes)])
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if test $libiberty_cv_declare_errno = yes
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then AC_DEFINE(NEED_DECLARATION_ERRNO, 1,
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[Define if errno must be declared even when <errno.h> is included.])
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fi
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])
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# FIXME: We temporarily define our own version of AC_PROG_CC. This is
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# copied from autoconf 2.12, but does not call AC_PROG_CC_WORKS. We
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# are probably using a cross compiler, which will not be able to fully
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# link an executable. This should really be fixed in autoconf
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# itself.
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AC_DEFUN(LIB_AC_PROG_CC,
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[AC_BEFORE([$0], [AC_PROG_CPP])dnl
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AC_PROVIDE([AC_PROG_CC])
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AC_CHECK_PROG(CC, gcc, gcc)
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if test -z "$CC"; then
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AC_CHECK_PROG(CC, cc, cc, , , /usr/ucb/cc)
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test -z "$CC" && AC_MSG_ERROR([no acceptable cc found in \$PATH])
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fi
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AC_PROG_CC_GNU
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if test $ac_cv_prog_gcc = yes; then
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GCC=yes
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ac_libiberty_warn_cflags='-W -Wall -Wtraditional -pedantic'
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dnl Check whether -g works, even if CFLAGS is set, in case the package
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dnl plays around with CFLAGS (such as to build both debugging and
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dnl normal versions of a library), tasteless as that idea is.
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ac_test_CFLAGS="${CFLAGS+set}"
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ac_save_CFLAGS="$CFLAGS"
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CFLAGS=
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AC_PROG_CC_G
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if test "$ac_test_CFLAGS" = set; then
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CFLAGS="$ac_save_CFLAGS"
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elif test $ac_cv_prog_cc_g = yes; then
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CFLAGS="-g -O2"
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else
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CFLAGS="-O2"
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fi
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else
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GCC=
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ac_libiberty_warn_cflags=
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test "${CFLAGS+set}" = set || CFLAGS="-g"
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fi
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AC_SUBST(ac_libiberty_warn_cflags)
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])
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# Work around a bug in autoheader. This can go away when we switch to
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# autoconf >2.50. The use of define instead of AC_DEFUN is
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# deliberate.
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define(AC_DEFINE_NOAUTOHEADER,
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[cat >> confdefs.h <<\EOF
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[#define] $1 ifelse($#, 2, [$2], $#, 3, [$2], 1)
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EOF
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])
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