Turn mempool_enabled() into a weak symbol

Before we had the following scheme:
mempool_enabled() would check mempool_use_allowed, and
libsystemd-shared would be linked with a .c file that provides mempool_use_allowed=true,
while other things would linked with a different .c file with mempool_use_allowed=false.

In the new scheme, mempool_enabled() itself is a weak symbol. If it's
not found, we assume false. So it only needs to be provided for libsystemd-shared,
where it can return false or true.

test-set-disable-mempool is libshared, so it gets the symbol. But then we
actually disable the mempool via envvar. mempool_enable() is called to check
its return value directly.

1 files changed, 1 insertions, 2 deletions

diff --git a/src/basic/mempool.h b/src/basic/mempool.h
index 0fe2f2789c..539ccbdf06 100644
--- a/src/basic/mempool.h
+++ b/src/basic/mempool.h
@@ -23,8 +23,7 @@ static struct mempool pool_name = { \
         .at_least = alloc_at_least, \
 }
 
-extern const bool mempool_use_allowed;
-bool mempool_enabled(void);
+__attribute__((weak)) bool mempool_enabled(void);
 
 #if VALGRIND
 void mempool_drop(struct mempool *mp);