Re: build failure without system extension macros

[Chet Ramey]

On 5/16/24 12:21 AM, Grisha Levit wrote:
> Since 9c430f6b changed some files to no longer include config.h,
> building with glibc and an -std= in CFLAGS fails because getopt,
> used in support/bashversion.c and mksyntax.c, is guarded by
> _POSIX_C_SOURCE >= 2 || _XOPEN_SOURCE

Yes. This was inspired by

https://lists.gnu.org/archive/html/bug-bash/2024-04/msg00158.html

There's increasing variation between C library versions, even down to
standards support (musl is particularly egregious here). This smacks
you in the face when cross-compiling: config.h is for the target system
compilation, but the build-time tools run on the host.

So we have this buildconf.h file for the subset of functionality the
build tools need. I didn't figure getopt() was part of that, since it's
been part of POSIX since 1992, but I guess we have to accommodate it.

Chet

--
``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU    chet@case.edu    http://tiswww.cwru.edu/~chet/

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