Use hybrid malloc for FreeBSD (Bug#28308)

FreeBSD aarch64 does not provide sbrk, so gmalloc cannot be used; when
using system malloc dumping does not work correctly (allocated data is
invalid after dumping).
* configure.ac: Set hybrid_malloc for freebsd.
* src/gmalloc.c (gdefault_morecore) [!HAVE_SBRK]: Don't call sbrk.

1 files changed, 6 insertions, 5 deletions

diff --git a/src/gmalloc.c b/src/gmalloc.c
index 2bda95ebd3d..a17d39c1eeb 100644
--- a/src/gmalloc.c
+++ b/src/gmalloc.c
@@ -1502,17 +1502,18 @@ extern void *__sbrk (ptrdiff_t increment);
 static void *
 gdefault_morecore (ptrdiff_t increment)
 {
-  void *result;
 #ifdef HYBRID_MALLOC
   if (!DUMPED)
     {
       return bss_sbrk (increment);
     }
 #endif
-  result = (void *) __sbrk (increment);
-  if (result == (void *) -1)
-    return NULL;
-  return result;
+#ifdef HAVE_SBRK
+  void *result = (void *) __sbrk (increment);
+  if (result != (void *) -1)
+    return result;
+#endif
+  return NULL;
 }
 
 void *(*__morecore) (ptrdiff_t) = gdefault_morecore;