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146 lines
5.2 KiB
146 lines
5.2 KiB
# Enable large files on systems where this is not the default. |
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# Copyright 1992-1996, 1998-2017 Free Software Foundation, Inc. |
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# This file is free software; the Free Software Foundation |
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# gives unlimited permission to copy and/or distribute it, |
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# with or without modifications, as long as this notice is preserved. |
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# The following implementation works around a problem in autoconf <= 2.69; |
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# AC_SYS_LARGEFILE does not configure for large inodes on Mac OS X 10.5, |
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# or configures them incorrectly in some cases. |
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m4_version_prereq([2.70], [] ,[ |
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# _AC_SYS_LARGEFILE_TEST_INCLUDES |
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# ------------------------------- |
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m4_define([_AC_SYS_LARGEFILE_TEST_INCLUDES], |
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[@%:@include <sys/types.h> |
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/* Check that off_t can represent 2**63 - 1 correctly. |
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We can't simply define LARGE_OFF_T to be 9223372036854775807, |
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since some C++ compilers masquerading as C compilers |
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incorrectly reject 9223372036854775807. */ |
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@%:@define LARGE_OFF_T (((off_t) 1 << 62) - 1 + ((off_t) 1 << 62)) |
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int off_t_is_large[[(LARGE_OFF_T % 2147483629 == 721 |
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&& LARGE_OFF_T % 2147483647 == 1) |
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? 1 : -1]];[]dnl |
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]) |
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# _AC_SYS_LARGEFILE_MACRO_VALUE(C-MACRO, VALUE, |
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# CACHE-VAR, |
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# DESCRIPTION, |
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# PROLOGUE, [FUNCTION-BODY]) |
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# -------------------------------------------------------- |
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m4_define([_AC_SYS_LARGEFILE_MACRO_VALUE], |
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[AC_CACHE_CHECK([for $1 value needed for large files], [$3], |
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[while :; do |
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m4_ifval([$6], [AC_LINK_IFELSE], [AC_COMPILE_IFELSE])( |
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[AC_LANG_PROGRAM([$5], [$6])], |
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[$3=no; break]) |
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m4_ifval([$6], [AC_LINK_IFELSE], [AC_COMPILE_IFELSE])( |
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[AC_LANG_PROGRAM([@%:@define $1 $2 |
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$5], [$6])], |
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[$3=$2; break]) |
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$3=unknown |
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break |
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done]) |
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case $$3 in #( |
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no | unknown) ;; |
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*) AC_DEFINE_UNQUOTED([$1], [$$3], [$4]);; |
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esac |
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rm -rf conftest*[]dnl |
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])# _AC_SYS_LARGEFILE_MACRO_VALUE |
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# AC_SYS_LARGEFILE |
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# ---------------- |
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# By default, many hosts won't let programs access large files; |
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# one must use special compiler options to get large-file access to work. |
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# For more details about this brain damage please see: |
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# http://www.unix-systems.org/version2/whatsnew/lfs20mar.html |
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AC_DEFUN([AC_SYS_LARGEFILE], |
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[AC_ARG_ENABLE(largefile, |
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[ --disable-largefile omit support for large files]) |
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if test "$enable_largefile" != no; then |
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AC_CACHE_CHECK([for special C compiler options needed for large files], |
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ac_cv_sys_largefile_CC, |
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[ac_cv_sys_largefile_CC=no |
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if test "$GCC" != yes; then |
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ac_save_CC=$CC |
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while :; do |
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# IRIX 6.2 and later do not support large files by default, |
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# so use the C compiler's -n32 option if that helps. |
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AC_LANG_CONFTEST([AC_LANG_PROGRAM([_AC_SYS_LARGEFILE_TEST_INCLUDES])]) |
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AC_COMPILE_IFELSE([], [break]) |
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CC="$CC -n32" |
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AC_COMPILE_IFELSE([], [ac_cv_sys_largefile_CC=' -n32'; break]) |
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break |
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done |
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CC=$ac_save_CC |
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rm -f conftest.$ac_ext |
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fi]) |
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if test "$ac_cv_sys_largefile_CC" != no; then |
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CC=$CC$ac_cv_sys_largefile_CC |
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fi |
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_AC_SYS_LARGEFILE_MACRO_VALUE(_FILE_OFFSET_BITS, 64, |
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ac_cv_sys_file_offset_bits, |
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[Number of bits in a file offset, on hosts where this is settable.], |
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[_AC_SYS_LARGEFILE_TEST_INCLUDES]) |
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if test $ac_cv_sys_file_offset_bits = unknown; then |
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_AC_SYS_LARGEFILE_MACRO_VALUE(_LARGE_FILES, 1, |
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ac_cv_sys_large_files, |
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[Define for large files, on AIX-style hosts.], |
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[_AC_SYS_LARGEFILE_TEST_INCLUDES]) |
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fi |
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AC_DEFINE([_DARWIN_USE_64_BIT_INODE], [1], |
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[Enable large inode numbers on Mac OS X 10.5.]) |
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fi |
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])# AC_SYS_LARGEFILE |
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])# m4_version_prereq 2.70 |
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# Enable large files on systems where this is implemented by Gnulib, not by the |
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# system headers. |
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# Set the variables WINDOWS_64_BIT_OFF_T, WINDOWS_64_BIT_ST_SIZE if Gnulib |
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# overrides ensure that off_t or 'struct size.st_size' are 64-bit, respectively. |
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AC_DEFUN([gl_LARGEFILE], |
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[ |
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AC_REQUIRE([AC_CANONICAL_HOST]) |
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case "$host_os" in |
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mingw*) |
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dnl Native Windows. |
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dnl mingw64 defines off_t to a 64-bit type already, if |
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dnl _FILE_OFFSET_BITS=64, which is ensured by AC_SYS_LARGEFILE. |
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AC_CACHE_CHECK([for 64-bit off_t], [gl_cv_type_off_t_64], |
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[AC_COMPILE_IFELSE( |
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[AC_LANG_PROGRAM( |
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[[#include <sys/types.h> |
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int verify_off_t_size[sizeof (off_t) >= 8 ? 1 : -1]; |
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]], |
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[[]])], |
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[gl_cv_type_off_t_64=yes], [gl_cv_type_off_t_64=no]) |
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]) |
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if test $gl_cv_type_off_t_64 = no; then |
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WINDOWS_64_BIT_OFF_T=1 |
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else |
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WINDOWS_64_BIT_OFF_T=0 |
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fi |
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dnl But all native Windows platforms (including mingw64) have a 32-bit |
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dnl st_size member in 'struct stat'. |
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WINDOWS_64_BIT_ST_SIZE=1 |
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;; |
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*) |
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dnl Nothing to do on gnulib's side. |
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dnl A 64-bit off_t is |
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dnl - already the default on Mac OS X, FreeBSD, NetBSD, OpenBSD, IRIX, |
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dnl OSF/1, Cygwin, |
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dnl - enabled by _FILE_OFFSET_BITS=64 (ensured by AC_SYS_LARGEFILE) on |
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dnl glibc, HP-UX, Solaris, |
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dnl - enabled by _LARGE_FILES=1 (ensured by AC_SYS_LARGEFILE) on AIX, |
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dnl - impossible to achieve on Minix 3.1.8. |
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WINDOWS_64_BIT_OFF_T=0 |
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WINDOWS_64_BIT_ST_SIZE=0 |
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;; |
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esac |
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])
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