diff options
Diffstat (limited to 'gnulib-m4/memchr.m4')
| -rw-r--r-- | gnulib-m4/memchr.m4 | 33 |
1 files changed, 22 insertions, 11 deletions
diff --git a/gnulib-m4/memchr.m4 b/gnulib-m4/memchr.m4 index 25d32f0..0cca69d 100644 --- a/gnulib-m4/memchr.m4 +++ b/gnulib-m4/memchr.m4 @@ -1,11 +1,13 @@ -# memchr.m4 serial 12 -dnl Copyright (C) 2002-2004, 2009-2016 Free Software Foundation, Inc. +# memchr.m4 serial 13 +dnl Copyright (C) 2002-2004, 2009-2017 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], [ + AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles + dnl Check for prerequisites for memory fence checks. gl_FUNC_MMAP_ANON AC_CHECK_HEADERS_ONCE([sys/mman.h]) @@ -23,10 +25,10 @@ AC_DEFUN_ONCE([gl_FUNC_MEMCHR], if test $HAVE_MEMCHR = 1; then # Detect platform-specific bugs in some versions of glibc: # memchr should not dereference anything with length 0 - # http://bugzilla.redhat.com/499689 + # https://bugzilla.redhat.com/show_bug.cgi?id=499689 # memchr should not dereference overestimated length after a match - # http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=521737 - # http://sourceware.org/bugzilla/show_bug.cgi?id=10162 + # https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=521737 + # https://sourceware.org/bugzilla/show_bug.cgi?id=10162 # Assume that memchr works on platforms that lack mprotect. AC_CACHE_CHECK([whether memchr works], [gl_cv_func_memchr_works], [AC_RUN_IFELSE([AC_LANG_PROGRAM([[ @@ -73,12 +75,21 @@ AC_DEFUN_ONCE([gl_FUNC_MEMCHR], result |= 4; } return result; -]])], [gl_cv_func_memchr_works=yes], [gl_cv_func_memchr_works=no], - [dnl Be pessimistic for now. - gl_cv_func_memchr_works="guessing no"])]) - if test "$gl_cv_func_memchr_works" != yes; then - REPLACE_MEMCHR=1 - fi +]])], + [gl_cv_func_memchr_works=yes], + [gl_cv_func_memchr_works=no], + [case "$host_os" in + # Guess yes on native Windows. + mingw*) gl_cv_func_memchr_works="guessing yes" ;; + # Be pessimistic for now. + *) gl_cv_func_memchr_works="guessing no" ;; + esac + ]) + ]) + case "$gl_cv_func_memchr_works" in + *yes) ;; + *) REPLACE_MEMCHR=1 ;; + esac fi ]) |