Re: AC_SYS_LARGEFILE
Evgeny Grin <[email protected]>
| Newsgroups | gmane.comp.sysutils.autoconf.general |
|---|---|
| Message-ID | <[email protected]> |
On 20.09.2023 0:04, Paul Eggert wrote: > On 2023-09-19 01:52, Sébastien Hinderer wrote: >> Are you saying that there should normally not be any >> undef in the config headers for macros whose name starts with a _ sign? > > No, it's normal when Autoconf is used as intended. What's not normal is > that your package is including <config.h> after including standard headers. > > Since macro names starting with "_" can affect how standard headers > behave, these macro definitions need to be done before including any > standard headers, and this is partly why <config.h> should be included > first. > > Although _FILE_OFFSET_BITS is one example of such a macro (so you'll > need to set it using "gcc -D" or equivalent), there are likely many > other examples and they all need to be treated similarly. > I'd also recommend to avoid using any types from standard headers if their interpretation depends on predefined macros, like 'off_t'. You cannot grantee that macros will be defined in the same way when your header is included by third-party apps. Use only "stable" types, like 'uint64_t'. If you need have a function with "file offset" argument then use either 'uint64_t' (if the offset if always from the start of the file) or 'int64_t' (if the offset is relative to current position). Them handle in you code situations when system 'off_t' is 32-bit wide and application requested more than UINT32_MAX offset. Your "config.h" must not be used in your public header as it will create various problems. If you cannot include "config.h" before the system headers in your application/library, then another workaround is excluding of AC_CONFIG_HEADERS from "configure.ac". In such case all definitions will be in @DEFS@ that could be used in CPPFLAGS (or used directly by libtool as $(DEFS)), therefore all macros will be defined always, before including system headers. -- Evgeny
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