Subject: [PATCH 2/2] nedmalloc: avoid compiler warning about unused value

From: René Scharfe <[email-masked]>
Date: Wed, 7 Aug 2019 15:09:02 +0200

Cast the evaluated value of the macro INITIAL_LOCK to void to instruct
the compiler that we're not interested in said value nor the following
warning:

In file included from compat/nedmalloc/nedmalloc.c:63:
compat/nedmalloc/malloc.c.h: In function ‘init_user_mstate’:
compat/nedmalloc/malloc.c.h:1706:62: error: right-hand operand of comma expression has no effect [-Werror=unused-value]
 1706 | #define INITIAL_LOCK(sl)      (memset(sl, 0, sizeof(MLOCK_T)), 0)
      |                               ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~
compat/nedmalloc/malloc.c.h:5020:3: note: in expansion of macro ‘INITIAL_LOCK’
 5020 |   INITIAL_LOCK(&m->mutex);
      |   ^~~~~~~~~~~~

Signed-off-by: René Scharfe <[email-masked]>
---
 compat/nedmalloc/malloc.c.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/compat/nedmalloc/malloc.c.h b/compat/nedmalloc/malloc.c.h
index 88c131ca93..9134349590 100644
--- a/compat/nedmalloc/malloc.c.h
+++ b/compat/nedmalloc/malloc.c.h
@@ -3066,7 +3066,7 @@ static int init_mparams(void) {
 #if !ONLY_MSPACES
     /* Set up lock for main malloc area */
     gm->mflags = mparams.default_mflags;
-    INITIAL_LOCK(&gm->mutex);
+    (void)INITIAL_LOCK(&gm->mutex);
 #endif

 #if (FOOTERS && !INSECURE)
@@ -5017,7 +5017,7 @@ static mstate init_user_mstate(char* tbase, size_t tsize) {
   mchunkptr msp = align_as_chunk(tbase);
   mstate m = (mstate)(chunk2mem(msp));
   memset(m, 0, msize);
-  INITIAL_LOCK(&m->mutex);
+  (void)INITIAL_LOCK(&m->mutex);
   msp->head = (msize|PINUSE_BIT|CINUSE_BIT);
   m->seg.base = m->least_addr = tbase;
   m->seg.size = m->footprint = m->max_footprint = tsize;
--
2.22.0