From 809277f8ce3065577b99603f221d63216fb2de33 Mon Sep 17 00:00:00 2001 From: Pedro Alves Date: Thu, 19 Apr 2012 15:27:52 +0000 Subject: 2012-04-19 Pedro Alves gdb/ * gnulib/: Move whole directory ... * gnulib/import/: ... here, and re-rerun gnulib-tool to adjust. * Makefile.in (LIBGNU, INCGNU, GNULIB_H, CLEANDIRS) (REQUIRED_SUBDIRS, all-lib, gnulib/Makefile, ACLOCAL_AMFLAGS) (aclocal_m4_deps): Adjust. * aclocal.m4: Regenerate. * configure: Regenerate. * configure.ac: Adjust AC_OUTPUT output. gdbserver/ * Makefile.in (LIBGNU, INCGNU): Adjust. (GNULIB_FLAGS_TO_PASS, GNULIB_H): Adjust. (all, install-only, uninstall, clean-info, all-lib, clean) (maintainer-clean, Makefile, gnulib/Makefile): Adjust. * configure.ac: Adjust AC_OUTPUT output. * aclocal.m4: Regenerate. * configure: Regenerate. --- gdb/gnulib/import/m4/memchr.m4 | 88 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 88 insertions(+) create mode 100644 gdb/gnulib/import/m4/memchr.m4 (limited to 'gdb/gnulib/import/m4/memchr.m4') diff --git a/gdb/gnulib/import/m4/memchr.m4 b/gdb/gnulib/import/m4/memchr.m4 new file mode 100644 index 0000000..0040294 --- /dev/null +++ b/gdb/gnulib/import/m4/memchr.m4 @@ -0,0 +1,88 @@ +# memchr.m4 serial 12 +dnl Copyright (C) 2002-2004, 2009-2012 Free Software Foundation, Inc. +dnl This file is free software; the Free Software Foundation +dnl gives unlimited permission to copy and/or distribute it, +dnl with or without modifications, as long as this notice is preserved. + +AC_DEFUN_ONCE([gl_FUNC_MEMCHR], +[ + dnl Check for prerequisites for memory fence checks. + gl_FUNC_MMAP_ANON + AC_CHECK_HEADERS_ONCE([sys/mman.h]) + AC_CHECK_FUNCS_ONCE([mprotect]) + + AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS]) + m4_ifdef([gl_FUNC_MEMCHR_OBSOLETE], [ + dnl These days, we assume memchr is present. But if support for old + dnl platforms is desired: + AC_CHECK_FUNCS_ONCE([memchr]) + if test $ac_cv_func_memchr = no; then + HAVE_MEMCHR=0 + fi + ]) + if test $HAVE_MEMCHR = 1; then + # Detect platform-specific bugs in some versions of glibc: + # memchr should not dereference anything with length 0 + # http://bugzilla.redhat.com/499689 + # memchr should not dereference overestimated length after a match + # http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=521737 + # http://sourceware.org/bugzilla/show_bug.cgi?id=10162 + # Assume that memchr works on platforms that lack mprotect. + AC_CACHE_CHECK([whether memchr works], [gl_cv_func_memchr_works], + [AC_RUN_IFELSE([AC_LANG_PROGRAM([[ +#include +#if HAVE_SYS_MMAN_H +# include +# include +# include +# include +# ifndef MAP_FILE +# define MAP_FILE 0 +# endif +#endif +]], [[ + int result = 0; + char *fence = NULL; +#if HAVE_SYS_MMAN_H && HAVE_MPROTECT +# if HAVE_MAP_ANONYMOUS + const int flags = MAP_ANONYMOUS | MAP_PRIVATE; + const int fd = -1; +# else /* !HAVE_MAP_ANONYMOUS */ + const int flags = MAP_FILE | MAP_PRIVATE; + int fd = open ("/dev/zero", O_RDONLY, 0666); + if (fd >= 0) +# endif + { + int pagesize = getpagesize (); + char *two_pages = + (char *) mmap (NULL, 2 * pagesize, PROT_READ | PROT_WRITE, + flags, fd, 0); + if (two_pages != (char *)(-1) + && mprotect (two_pages + pagesize, pagesize, PROT_NONE) == 0) + fence = two_pages + pagesize; + } +#endif + if (fence) + { + if (memchr (fence, 0, 0)) + result |= 1; + strcpy (fence - 9, "12345678"); + if (memchr (fence - 9, 0, 79) != fence - 1) + result |= 2; + if (memchr (fence - 1, 0, 3) != fence - 1) + result |= 4; + } + return result; +]])], [gl_cv_func_memchr_works=yes], [gl_cv_func_memchr_works=no], + [dnl Be pessimistic for now. + gl_cv_func_memchr_works="guessing no"])]) + if test "$gl_cv_func_memchr_works" != yes; then + REPLACE_MEMCHR=1 + fi + fi +]) + +# Prerequisites of lib/memchr.c. +AC_DEFUN([gl_PREREQ_MEMCHR], [ + AC_CHECK_HEADERS([bp-sym.h]) +]) -- cgit v1.1