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localedef: Fix bootstrapping on Ubuntu 16.04

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Glibc's stdlib.h defines various prototypes for GNU extensions that take
a locale_t. Newer versions use locale_t directly and include an internal
bits/types/locale_t.h in order to get its definition, but older versions
include xlocale.h for that, for which our bootstrap version is empty.
Moreover it expects to use the glibc-specific __locale_t type. Thus,
provide dummy definitions of both types in order to ensure the
prototypes don't give any errors, and guard against the header being
inadvertently included between the bootstrapping namespace.h and
un-namespace.h, where locale_t is #define'd.

This header is not used when bootstrapping on FreeBSD and exists solely
to stub out glibc's, so this should have no impact on FreeBSD hosts.

Reviewed by:	arichardson, emaste (comment only)
Differential Revision:	https://reviews.freebsd.org/D28317
This commit is contained in:
Jessica Clarke 2021-02-10 16:41:35 +00:00
parent 5c18744ea9
commit 01d07b03ef
1 changed files with 16 additions and 3 deletions
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19
usr.bin/localedef/bootstrap/xlocale.h
View file

@ -35,8 +35,21 @@
*
* $FreeBSD$
*/
#pragma once
/*
* This header only exists to avoid pulling in the host xlocale.h from
* the libc-internal headers. This is required since newer Linux GLibc no
* longer includes xlocale.h and older versions include an incompatible header.
* This header only exists to avoid pulling in the host xlocale.h from the
* libc-internal headers. New versions of glibc include bits/types/locale.h
* from stdlib.h and so get their own locale_t (and don't provide xlocale.h),
* but older versions include xlocale.h and expect to have a __locale_t. Thus
* we provide dummy definitions of both so the (unused) prototypes don't give
* errors.
*/
#ifdef locale_t
#error "Dummy xlocale.h included inside bootstrapping namespace context"
#endif
typedef struct __dummy_host_locale *__locale_t;
typedef __locale_t locale_t;