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| 1 # mmap-anon.m4 serial 8 | |
| 2 dnl Copyright (C) 2005, 2007, 2009-2011 Free Software Foundation, Inc. | |
| 3 dnl This file is free software; the Free Software Foundation | |
| 4 dnl gives unlimited permission to copy and/or distribute it, | |
| 5 dnl with or without modifications, as long as this notice is preserved. | |
| 6 | |
| 7 # Detect how mmap can be used to create anonymous (not file-backed) memory | |
| 8 # mappings. | |
| 9 # - On Linux, AIX, OSF/1, Solaris, Cygwin, Interix, Haiku, both MAP_ANONYMOUS | |
| 10 # and MAP_ANON exist and have the same value. | |
| 11 # - On HP-UX, only MAP_ANONYMOUS exists. | |
| 12 # - On MacOS X, FreeBSD, NetBSD, OpenBSD, only MAP_ANON exists. | |
| 13 # - On IRIX, neither exists, and a file descriptor opened to /dev/zero must be | |
| 14 # used. | |
| 15 | |
| 16 AC_DEFUN([gl_FUNC_MMAP_ANON], | |
| 17 [ | |
| 18 dnl Work around a bug of AC_EGREP_CPP in autoconf-2.57. | |
| 19 AC_REQUIRE([AC_PROG_CPP]) | |
| 20 AC_REQUIRE([AC_PROG_EGREP]) | |
| 21 | |
| 22 dnl Persuade glibc <sys/mman.h> to define MAP_ANONYMOUS. | |
| 23 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS]) | |
| 24 | |
| 25 # Check for mmap(). Don't use AC_FUNC_MMAP, because it checks too much: it | |
| 26 # fails on HP-UX 11, because MAP_FIXED mappings do not work. But this is | |
| 27 # irrelevant for anonymous mappings. | |
| 28 AC_CHECK_FUNC([mmap], [gl_have_mmap=yes], [gl_have_mmap=no]) | |
| 29 | |
| 30 # Try to allow MAP_ANONYMOUS. | |
| 31 gl_have_mmap_anonymous=no | |
| 32 if test $gl_have_mmap = yes; then | |
| 33 AC_MSG_CHECKING([for MAP_ANONYMOUS]) | |
| 34 AC_EGREP_CPP([I cant identify this map.], [ | |
| 35 #include <sys/mman.h> | |
| 36 #ifdef MAP_ANONYMOUS | |
| 37 I cant identify this map. | |
| 38 #endif | |
| 39 ], | |
| 40 [gl_have_mmap_anonymous=yes]) | |
| 41 if test $gl_have_mmap_anonymous != yes; then | |
| 42 AC_EGREP_CPP([I cant identify this map.], [ | |
| 43 #include <sys/mman.h> | |
| 44 #ifdef MAP_ANON | |
| 45 I cant identify this map. | |
| 46 #endif | |
| 47 ], | |
| 48 [AC_DEFINE([MAP_ANONYMOUS], [MAP_ANON], | |
| 49 [Define to a substitute value for mmap()'s MAP_ANONYMOUS flag.]) | |
| 50 gl_have_mmap_anonymous=yes]) | |
| 51 fi | |
| 52 AC_MSG_RESULT([$gl_have_mmap_anonymous]) | |
| 53 if test $gl_have_mmap_anonymous = yes; then | |
| 54 AC_DEFINE([HAVE_MAP_ANONYMOUS], [1], | |
| 55 [Define to 1 if mmap()'s MAP_ANONYMOUS flag is available after including | |
| 56 config.h and <sys/mman.h>.]) | |
| 57 fi | |
| 58 fi | |
| 59 ]) | |
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Chromium Code Reviews
Issue 11969036:
Merge GDB 7.5.1 (Closed)
Base URL: http://git.chromium.org/native_client/nacl-gdb.git@master