pgettext compiler error with -O0

[Ben Pfaff]

Hello!

Consider adding the following modules/gettext-tests:
----------------------------------------------------------------------
Files:
tests/test-gettext.c

Depends-on:

configure.ac:

Makefile.am:
TESTS += test-gettext
check_PROGRAMS += test-gettext
----------------------------------------------------------------------

and the following tests/test-gettext.c:
----------------------------------------------------------------------
#include <config.h>

#include <gettext.h>

int
main (void)
{
  pgettext ("", "");
}
----------------------------------------------------------------------

Then, if I run:
./gnulib-tool --create-testdir --with-tests --dir=gettext gettext
cd gettext
./configure CFLAGS=-O0
make

I get the following compiler errors:

gcc -DHAVE_CONFIG_H -I.  -DGNULIB_STRICT_CHECKING=1 -I. -I. -I..
-I./.. -I../gllib -I./../gllib   -W
no-error -O0 -MT test-gettext.o -MD -MP -MF .deps/test-gettext.Tpo -c
-o test-gettext.o test-gettext
.c
In file included from test-gettext.c:3:
test-gettext.c: In function ‘main’:
../gllib/gettext.h:123:67: error: ‘LC_MESSAGES’ undeclared (first use
in this function)
 123 |    pgettext_aux (NULL, Msgctxt GETTEXT_CONTEXT_GLUE Msgid,
Msgid, LC_MESSAGES)
     |
  ^~~~~~~~~~~
test-gettext.c:8:3: note: in expansion of macro ‘pgettext’
   8 |   pgettext ("", "");
     |   ^~~~~~~~
../gllib/gettext.h:123:67: note: each undeclared identifier is
reported only once for each function
it appears in
 123 |    pgettext_aux (NULL, Msgctxt GETTEXT_CONTEXT_GLUE Msgid,
Msgid, LC_MESSAGES)
     |
  ^~~~~~~~~~~
test-gettext.c:8:3: note: in expansion of macro ‘pgettext’
   8 |   pgettext ("", "");
     |   ^~~~~~~~
make[4]: *** [Makefile:717: test-gettext.o] Error 1

I don't get these errors if I omit 'CFLAGS=-O0'.

This was reported against PSPP, in a less stripped-down form, by
Friedrich Beckmann (CCed), here:
https://lists.gnu.org/archive/html/pspp-dev/2024-11/msg00000.html

Thanks,

Ben.