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| 1 # memmem.m4 serial 14 | |
| 2 dnl Copyright (C) 2002, 2003, 2004, 2007, 2008, 2009, 2010 Free Software | |
| 3 dnl Foundation, Inc. | |
| 4 dnl This file is free software; the Free Software Foundation | |
| 5 dnl gives unlimited permission to copy and/or distribute it, | |
| 6 dnl with or without modifications, as long as this notice is preserved. | |
| 7 | |
| 8 dnl Check that memmem is present. | |
| 9 AC_DEFUN([gl_FUNC_MEMMEM_SIMPLE], | |
| 10 [ | |
| 11 dnl Persuade glibc <string.h> to declare memmem(). | |
| 12 AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS]) | |
| 13 | |
| 14 AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS]) | |
| 15 AC_REPLACE_FUNCS([memmem]) | |
| 16 AC_CHECK_DECLS_ONCE([memmem]) | |
| 17 if test $ac_cv_have_decl_memmem = no; then | |
| 18 HAVE_DECL_MEMMEM=0 | |
| 19 fi | |
| 20 gl_PREREQ_MEMMEM | |
| 21 ]) # gl_FUNC_MEMMEM_SIMPLE | |
| 22 | |
| 23 dnl Additionally, check that memmem is efficient and handles empty needles. | |
| 24 AC_DEFUN([gl_FUNC_MEMMEM], | |
| 25 [ | |
| 26 AC_REQUIRE([gl_FUNC_MEMMEM_SIMPLE]) | |
| 27 if test $ac_cv_have_decl_memmem = yes; then | |
| 28 AC_CACHE_CHECK([whether memmem works in linear time], | |
| 29 [gl_cv_func_memmem_works], | |
| 30 [AC_RUN_IFELSE([AC_LANG_PROGRAM([[ | |
| 31 #include <signal.h> /* for signal */ | |
| 32 #include <string.h> /* for memmem */ | |
| 33 #include <stdlib.h> /* for malloc */ | |
| 34 #include <unistd.h> /* for alarm */ | |
| 35 ]], [[size_t m = 1000000; | |
| 36 char *haystack = (char *) malloc (2 * m + 1); | |
| 37 char *needle = (char *) malloc (m + 1); | |
| 38 void *result = 0; | |
| 39 /* Failure to compile this test due to missing alarm is okay, | |
| 40 since all such platforms (mingw) also lack memmem. */ | |
| 41 signal (SIGALRM, SIG_DFL); | |
| 42 alarm (5); | |
| 43 /* Check for quadratic performance. */ | |
| 44 if (haystack && needle) | |
| 45 { | |
| 46 memset (haystack, 'A', 2 * m); | |
| 47 haystack[2 * m] = 'B'; | |
| 48 memset (needle, 'A', m); | |
| 49 needle[m] = 'B'; | |
| 50 result = memmem (haystack, 2 * m + 1, needle, m + 1); | |
| 51 } | |
| 52 /* Check for empty needle behavior. */ | |
| 53 return !result || !memmem ("a", 1, 0, 0);]])], | |
| 54 [gl_cv_func_memmem_works=yes], [gl_cv_func_memmem_works=no], | |
| 55 [dnl Only glibc >= 2.9 and cygwin >= 1.7.0 are known to have a | |
| 56 dnl memmem that works in linear time. | |
| 57 AC_EGREP_CPP([Lucky user], | |
| 58 [ | |
| 59 #include <features.h> | |
| 60 #ifdef __GNU_LIBRARY__ | |
| 61 #if (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 9) || (__GLIBC__ > 2) | |
| 62 Lucky user | |
| 63 #endif | |
| 64 #endif | |
| 65 #ifdef __CYGWIN__ | |
| 66 #include <cygwin/version.h> | |
| 67 #if CYGWIN_VERSION_DLL_MAJOR >= 1007 | |
| 68 Lucky user | |
| 69 #endif | |
| 70 #endif | |
| 71 ], | |
| 72 [gl_cv_func_memmem_works=yes], | |
| 73 [gl_cv_func_memmem_works="guessing no"]) | |
| 74 ]) | |
| 75 ]) | |
| 76 if test "$gl_cv_func_memmem_works" != yes; then | |
| 77 REPLACE_MEMMEM=1 | |
| 78 AC_LIBOBJ([memmem]) | |
| 79 fi | |
| 80 fi | |
| 81 ]) # gl_FUNC_MEMMEM | |
| 82 | |
| 83 # Prerequisites of lib/memmem.c. | |
| 84 AC_DEFUN([gl_PREREQ_MEMMEM], [:]) | |
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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