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Diffstat (limited to 'Build/source/libs/zziplib/zziplib-0.13.62/m4/ac_sys_largefile_sensitive.m4')
-rw-r--r-- | Build/source/libs/zziplib/zziplib-0.13.62/m4/ac_sys_largefile_sensitive.m4 | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/Build/source/libs/zziplib/zziplib-0.13.62/m4/ac_sys_largefile_sensitive.m4 b/Build/source/libs/zziplib/zziplib-0.13.62/m4/ac_sys_largefile_sensitive.m4 new file mode 100644 index 00000000000..235c7f9acaa --- /dev/null +++ b/Build/source/libs/zziplib/zziplib-0.13.62/m4/ac_sys_largefile_sensitive.m4 @@ -0,0 +1,46 @@ +dnl @synopsis AC_SYS_LARGEFILE_SENSITIVE +dnl +dnl checker whether the current system is sensitive to -Ddefines making +dnl off_t having different types/sizes. Automatically define a config.h +dnl symbol LARGEFILE_SENSITIVE if that is the case, otherwise leave +dnl everything as is. +dnl +dnl This macro builds on top of AC_SYS_LARGEFILE to detect whether +dnl special options are neede to make the code use 64bit off_t - in +dnl many setups this will also make the code use 64bit off_t +dnl immediatly. +dnl +dnl The common use of a LARGEFILE_SENSITIVE config.h-define is to +dnl rename exported functions, usually adding a 64 to the original +dnl function name. Such renamings are only needed on systems being both +dnl (a) 32bit off_t by default and (b) implementing large.file +dnl extensions (as for unix98). +dnl +dnl a renaming section could look like this: +dnl +dnl #if defined LARGEFILE_SENSITIVE && _FILE_OFFSET_BITS+0 == 64 +dnl #define zzip_open zzip_open64 +dnl #define zzip_seek zzip_seek64 +dnl #endif +dnl +dnl for libraries, it is best to take advantage of the prefix-config.h +dnl macro, otherwise you want to export a renamed LARGEFILE_SENSITIVE +dnl in an installed header file. -> see AX_PREFIX_CONFIG_H +dnl +dnl @category Misc +dnl @author Guido U. Draheim <guidod@gmx.de> +dnl @version 2009-07-27 +dnl @license GPLWithACException + +AC_DEFUN([AC_SYS_LARGEFILE_SENSITIVE],[dnl +AC_REQUIRE([AC_SYS_LARGEFILE])dnl +# we know about some internals of ac_sys_largefile here... +AC_MSG_CHECKING(whether system differentiates 64bit off_t by defines) +ac_cv_sys_largefile_sensitive="no" +if test ".${ac_cv_sys_file_offset_bits-no}${ac_cv_sys_large_files-no}" != ".nono" +then ac_cv_sys_largefile_sensitive="yes" + AC_DEFINE(LARGEFILE_SENSITIVE, 1, + [whether the system defaults to 32bit off_t but can do 64bit when requested]) +fi +AC_MSG_RESULT([$ac_cv_sys_largefile_sensitive]) +]) |