64 lines
2.1 KiB
Plaintext
64 lines
2.1 KiB
Plaintext
dnl ---------------------------------------------------------------------------
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dnl AC_SYS_LARGEFILE from wxWidgets code which is partly based on the code from
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dnl autoconf 2.5x)
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dnl ---------------------------------------------------------------------------
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dnl WX_SYS_LARGEFILE_TEST
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dnl
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dnl NB: original autoconf test was checking if compiler supported 6 bit off_t
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dnl arithmetic properly but this failed miserably with gcc under Linux
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dnl whereas the system still supports 64 bit files, so now simply check
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dnl that off_t is big enough
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define(WX_SYS_LARGEFILE_TEST,
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[typedef struct {
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unsigned int field: sizeof(off_t) == 8;
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} wxlf;
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])
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dnl WX_SYS_LARGEFILE_MACRO_VALUE(C-MACRO, VALUE, CACHE-VAR)
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define(WX_SYS_LARGEFILE_MACRO_VALUE,
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[
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AC_CACHE_CHECK([for $1 value needed for large files], [$3],
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[
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AC_TRY_COMPILE([#define $1 $2
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#include <sys/types.h>],
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WX_SYS_LARGEFILE_TEST,
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[$3=$2],
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[$3=no])
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]
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)
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if test "$$3" != no; then
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ac_cv_sys_largefiles=yes
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AC_DEFINE_UNQUOTED([$1], [$$3])
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fi
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])
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dnl AC_SYS_LARGEFILE
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dnl ----------------
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dnl By default, many hosts won't let programs access large files;
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dnl one must use special compiler options to get large-file access to work.
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dnl For more details about this brain damage please see:
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dnl http://www.sas.com/standards/large.file/x_open.20Mar96.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 "$enable_largefile" != no; then
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dnl _FILE_OFFSET_BITS==64 is needed for Linux, Solaris, ...
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dnl _LARGE_FILES -- for AIX
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ac_cv_sys_largefiles=no
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WX_SYS_LARGEFILE_MACRO_VALUE(_FILE_OFFSET_BITS, 64, ac_cv_sys_file_offset_bits)
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if test "x$ac_cv_sys_largefiles" != "xyes"; then
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WX_SYS_LARGEFILE_MACRO_VALUE(_LARGE_FILES, 1, ac_cv_sys_large_files)
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fi
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AC_MSG_CHECKING(if large file support is available)
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if test "x$ac_cv_sys_largefiles" = "xyes"; then
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AC_DEFINE(HAVE_LARGEFILE_SUPPORT)
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fi
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AC_MSG_RESULT($ac_cv_sys_largefiles)
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fi
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])
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