Simon Marchi 5ee80104ac gthread: ignore deprecated declarations in static inline functions
With a trivial file that just includes glib.h:

    #include <glib.h>

Compiled with:

    gcc -c test.c \
      -I /tmp/glib/include/glib-2.0/ \
      -I /tmp/glib/lib/x86_64-linux-gnu/glib-2.0/include \
      -DGLIB_VERSION_MAX_ALLOWED=GLIB_VERSION_2_28 \
      -DGLIB_VERSION_MIN_REQUIRED=GLIB_VERSION_2_28 \
      -fmax-errors=1 \
      -Werror

We get:

    In file included from /tmp/glib/include/glib-2.0/glib/gasyncqueue.h:32,
                     from /tmp/glib/include/glib-2.0/glib.h:32,
                     from test.c:1:
    /tmp/glib/include/glib-2.0/glib/gthread.h: In function ‘g_rec_mutex_locker_new’:
    /tmp/glib/include/glib-2.0/glib/gthread.h:396:3: error: ‘g_rec_mutex_lock’ is deprecated: Not available before 2.32 [-Werror=deprecated-declarations]
      396 |   g_rec_mutex_lock (rec_mutex);
          |   ^~~~~~~~~~~~~~~~
    /tmp/glib/include/glib-2.0/glib/gthread.h:196:17: note: declared here
      196 | void            g_rec_mutex_lock                (GRecMutex      *rec_mutex);
          |                 ^~~~~~~~~~~~~~~~
    compilation terminated due to -fmax-errors=1.

The problem is that the code in the static inline functions uses
g_rec_mutex_lock, introduced after 2.28.  This code is compiled
regardless of if it's actually used or not.

Suppress the warning by using G_GNUC_BEGIN_IGNORE_DEPRECATIONS /
G_GNUC_END_IGNORE_DEPRECATIONS.  There are precedents for doing that,
for example g_main_context_pusher_new in gmain.h.

Tested by building with all variations of GLIB_VERSION_MIN_REQUIRED /
GLIB_VERSION_MAX_ALLOWED:

    for i in $(seq 26 2 64); do
      gcc -c test.c \
        -I/tmp/glib/include/glib-2.0 \
        -I/tmp/glib/lib/x86_64-linux-gnu/glib-2.0/include \
        -DGLIB_VERSION_MAX_ALLOWED=GLIB_VERSION_2_$i \
        -DGLIB_VERSION_MIN_REQUIRED=GLIB_VERSION_2_$i \
        -fmax-errors=1 \
        -Werror
    done

Fixes: #2094
2020-05-07 11:10:21 +01:00
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