diff options
Diffstat (limited to 'm4/largefile.m4')
| -rw-r--r-- | m4/largefile.m4 | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/m4/largefile.m4 b/m4/largefile.m4 new file mode 100644 index 0000000..d83fea1 --- /dev/null +++ b/m4/largefile.m4 @@ -0,0 +1,104 @@ +# Enable large files on systems where this is not the default. + +# Copyright 1992-1996, 1998-2011 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. + +# The following implementation works around a problem in autoconf <= 2.68; +# AC_SYS_LARGEFILE does not configure for large inodes on Mac OS X 10.5. +m4_version_prereq([2.69], [] ,[ + +# _AC_SYS_LARGEFILE_TEST_INCLUDES +# ------------------------------- +m4_define([_AC_SYS_LARGEFILE_TEST_INCLUDES], +[@%:@include <sys/types.h> + /* Check that off_t can represent 2**63 - 1 correctly. + We can't simply define LARGE_OFF_T to be 9223372036854775807, + since some C++ compilers masquerading as C compilers + incorrectly reject 9223372036854775807. */ +@%:@define LARGE_OFF_T (((off_t) 1 << 62) - 1 + ((off_t) 1 << 62)) + int off_t_is_large[[(LARGE_OFF_T % 2147483629 == 721 + && LARGE_OFF_T % 2147483647 == 1) + ? 1 : -1]];[]dnl +]) + + +# _AC_SYS_LARGEFILE_MACRO_VALUE(C-MACRO, VALUE, +# CACHE-VAR, +# DESCRIPTION, +# PROLOGUE, [FUNCTION-BODY]) +# -------------------------------------------------------- +m4_define([_AC_SYS_LARGEFILE_MACRO_VALUE], +[AC_CACHE_CHECK([for $1 value needed for large files], [$3], +[while :; do + m4_ifval([$6], [AC_LINK_IFELSE], [AC_COMPILE_IFELSE])( + [AC_LANG_PROGRAM([$5], [$6])], + [$3=no; break]) + m4_ifval([$6], [AC_LINK_IFELSE], [AC_COMPILE_IFELSE])( + [AC_LANG_PROGRAM([@%:@define $1 $2 +$5], [$6])], + [$3=$2; break]) + $3=unknown + break +done]) +case $$3 in #( + no | unknown) ;; + *) AC_DEFINE_UNQUOTED([$1], [$$3], [$4]);; +esac +rm -rf conftest*[]dnl +])# _AC_SYS_LARGEFILE_MACRO_VALUE + + +# AC_SYS_LARGEFILE +# ---------------- +# By default, many hosts won't let programs access large files; +# one must use special compiler options to get large-file access to work. +# For more details about this brain damage please see: +# http://www.unix-systems.org/version2/whatsnew/lfs20mar.html +AC_DEFUN([AC_SYS_LARGEFILE], +[AC_ARG_ENABLE(largefile, + [ --disable-largefile omit support for large files]) +if test "$enable_largefile" != no; then + + AC_CACHE_CHECK([for special C compiler options needed for large files], + ac_cv_sys_largefile_CC, + [ac_cv_sys_largefile_CC=no + if test "$GCC" != yes; then + ac_save_CC=$CC + while :; do + # IRIX 6.2 and later do not support large files by default, + # so use the C compiler's -n32 option if that helps. + AC_LANG_CONFTEST([AC_LANG_PROGRAM([_AC_SYS_LARGEFILE_TEST_INCLUDES])]) + AC_COMPILE_IFELSE([], [break]) + CC="$CC -n32" + AC_COMPILE_IFELSE([], [ac_cv_sys_largefile_CC=' -n32'; break]) + break + done + CC=$ac_save_CC + rm -f conftest.$ac_ext + fi]) + if test "$ac_cv_sys_largefile_CC" != no; then + CC=$CC$ac_cv_sys_largefile_CC + fi + + _AC_SYS_LARGEFILE_MACRO_VALUE(_FILE_OFFSET_BITS, 64, + ac_cv_sys_file_offset_bits, + [Number of bits in a file offset, on hosts where this is settable.], + [_AC_SYS_LARGEFILE_TEST_INCLUDES]) + if test $ac_cv_sys_file_offset_bits = unknown; then + _AC_SYS_LARGEFILE_MACRO_VALUE(_LARGE_FILES, 1, + ac_cv_sys_large_files, + [Define for large files, on AIX-style hosts.], + [_AC_SYS_LARGEFILE_TEST_INCLUDES]) + fi + + AH_VERBATIM([_DARWIN_USE_64_BIT_INODE], +[/* Enable large inode numbers on Mac OS X. */ +#ifndef _DARWIN_USE_64_BIT_INODE +# define _DARWIN_USE_64_BIT_INODE 1 +#endif]) +fi +])# AC_SYS_LARGEFILE + +])# m4_version_prereq 2.69 |