X-Git-Url: https://git.gag.com/?a=blobdiff_plain;f=m4%2Fgetcwd.m4;fp=m4%2Fgetcwd.m4;h=50b96c666c3429a514e2b15de36b75886cfa66d9;hb=dc84183747ce1703eb99685b5dbde1f65a143c06;hp=df9c96869fd3646b7b0e27bf0af0a41915088feb;hpb=a2016c1de6e4884f6c8ed5cc498f3bf821c25ca4;p=debian%2Fgzip diff --git a/m4/getcwd.m4 b/m4/getcwd.m4 index df9c968..50b96c6 100644 --- a/m4/getcwd.m4 +++ b/m4/getcwd.m4 @@ -1,77 +1,152 @@ # getcwd.m4 - check for working getcwd that is compatible with glibc -# Copyright (C) 2001, 2003, 2004, 2005, 2006, 2007, 2009, 2010 Free Software -# Foundation, Inc. +# Copyright (C) 2001, 2003-2007, 2009-2012 Free Software Foundation, Inc. # This file is free software; the Free Software Foundation # gives unlimited permission to copy and/or distribute it, # with or without modifications, as long as this notice is preserved. # Written by Paul Eggert. -# serial 2 +# serial 12 AC_DEFUN([gl_FUNC_GETCWD_NULL], [ + AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles + AC_CHECK_HEADERS_ONCE([unistd.h]) AC_CACHE_CHECK([whether getcwd (NULL, 0) allocates memory for result], [gl_cv_func_getcwd_null], [AC_RUN_IFELSE([AC_LANG_PROGRAM([[ -# include +# if HAVE_UNISTD_H +# include +# else /* on Windows with MSVC */ +# include +# endif # ifndef getcwd char *getcwd (); # endif ]], [[ #if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__ -/* mingw cwd does not start with '/', but getcwd does allocate. */ +/* mingw cwd does not start with '/', but getcwd does allocate. + However, mingw fails to honor non-zero size. */ #else if (chdir ("/") != 0) return 1; else { char *f = getcwd (NULL, 0); - return ! (f && f[0] == '/' && !f[1]); + if (! f) + return 2; + if (f[0] != '/') + return 3; + if (f[1] != '\0') + return 4; + return 0; } #endif ]])], [gl_cv_func_getcwd_null=yes], [gl_cv_func_getcwd_null=no], - [[ - case "$host_os" in - # Guess yes on glibc systems. - *-gnu*) gl_cv_func_getcwd_null="guessing yes";; - # Guess yes on Cygwin. - cygwin*) gl_cv_func_getcwd_null="guessing yes";; - # Guess yes on mingw. - mingw*) gl_cv_func_getcwd_null="guessing yes";; - # If we don't know, assume the worst. - *) gl_cv_func_getcwd_null="guessing no";; - esac + [[case "$host_os" in + # Guess yes on glibc systems. + *-gnu*) gl_cv_func_getcwd_null="guessing yes";; + # Guess yes on Cygwin. + cygwin*) gl_cv_func_getcwd_null="guessing yes";; + # If we don't know, assume the worst. + *) gl_cv_func_getcwd_null="guessing no";; + esac ]])]) ]) +AC_DEFUN([gl_FUNC_GETCWD_SIGNATURE], +[ + AC_CACHE_CHECK([for getcwd with POSIX signature], + [gl_cv_func_getcwd_posix_signature], + [AC_COMPILE_IFELSE( + [AC_LANG_PROGRAM( + [[#include ]], + [[extern + #ifdef __cplusplus + "C" + #endif + char *getcwd (char *, size_t); + ]]) + ], + [gl_cv_func_getcwd_posix_signature=yes], + [gl_cv_func_getcwd_posix_signature=no]) + ]) +]) + +dnl Guarantee that getcwd will malloc with a NULL first argument. Assumes +dnl that either the system getcwd is robust, or that calling code is okay +dnl with spurious failures when run from a directory with an absolute name +dnl larger than 4k bytes. +dnl +dnl Assumes that getcwd exists; if you are worried about obsolete +dnl platforms that lacked getcwd(), then you need to use the GPL module. +AC_DEFUN([gl_FUNC_GETCWD_LGPL], +[ + AC_REQUIRE([gl_UNISTD_H_DEFAULTS]) + AC_REQUIRE([gl_FUNC_GETCWD_NULL]) + AC_REQUIRE([gl_FUNC_GETCWD_SIGNATURE]) + + case $gl_cv_func_getcwd_null,$gl_cv_func_getcwd_posix_signature in + *yes,yes) ;; + *) + dnl Minimal replacement lib/getcwd-lgpl.c. + REPLACE_GETCWD=1 + ;; + esac +]) + +dnl Check for all known getcwd bugs; useful for a program likely to be +dnl executed from an arbitrary location. AC_DEFUN([gl_FUNC_GETCWD], [ AC_REQUIRE([gl_UNISTD_H_DEFAULTS]) AC_REQUIRE([gl_FUNC_GETCWD_NULL]) + AC_REQUIRE([gl_FUNC_GETCWD_SIGNATURE]) AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles gl_abort_bug=no - case $gl_cv_func_getcwd_null,$host_os in - *,mingw*) - gl_cv_func_getcwd_path_max=yes;; - yes,*) - gl_FUNC_GETCWD_PATH_MAX - gl_FUNC_GETCWD_ABORT_BUG([gl_abort_bug=yes]);; + case "$host_os" in + mingw*) + gl_cv_func_getcwd_path_max=yes + ;; + *) + gl_FUNC_GETCWD_PATH_MAX + case "$gl_cv_func_getcwd_null" in + *yes) + gl_FUNC_GETCWD_ABORT_BUG([gl_abort_bug=yes]) + ;; + esac + ;; + esac + dnl Define HAVE_MINIMALLY_WORKING_GETCWD and HAVE_PARTLY_WORKING_GETCWD + dnl if appropriate. + case "$gl_cv_func_getcwd_path_max" in + "no, it has the AIX bug") ;; + *) + AC_DEFINE([HAVE_MINIMALLY_WORKING_GETCWD], [1], + [Define to 1 if getcwd minimally works, that is, its result can be + trusted when it succeeds.]) + ;; + esac + case "$gl_cv_func_getcwd_path_max" in + "no, but it is partly working") + AC_DEFINE([HAVE_PARTLY_WORKING_GETCWD], [1], + [Define to 1 if getcwd works, except it sometimes fails when it + shouldn't, setting errno to ERANGE, ENAMETOOLONG, or ENOENT.]) + ;; esac - case $gl_cv_func_getcwd_null,$gl_cv_func_getcwd_path_max,$gl_abort_bug in - *yes,yes,no) ;; - *) + if { case "$gl_cv_func_getcwd_null" in *yes) false;; *) true;; esac; } \ + || test $gl_cv_func_getcwd_posix_signature != yes \ + || test "$gl_cv_func_getcwd_path_max" != yes \ + || test $gl_abort_bug = yes; then REPLACE_GETCWD=1 - AC_LIBOBJ([getcwd]) - gl_PREREQ_GETCWD;; - esac + fi ]) -# Prerequisites of lib/getcwd.c. +# Prerequisites of lib/getcwd.c, when full replacement is in effect. AC_DEFUN([gl_PREREQ_GETCWD], [ AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])