Another case of assignment from a value-initialized temporary, which
in this case ought to be placement new.
Tested x86_64-pc-linux-gnu, applying to trunk.
commit ccd4031ebdabf02fe0d54bb43a68c0fa72ec2708
Author: Jason Merrill <ja...@redhat.com>
Date: Thu May 17 17:16:28 2018 -0400
* line-map.c (linemap_init): Use placement new.
* system.h: #include <new>.
diff --git a/libcpp/line-map.c b/libcpp/line-map.c
index a84084c99f0..b2ebfeb16d4 100644
--- a/libcpp/line-map.c
+++ b/libcpp/line-map.c
@@ -348,7 +348,7 @@ linemap_init (struct line_maps *set,
/* PR33916, needed to fix PR82939. */
memset (set, 0, sizeof (struct line_maps));
#else
- *set = line_maps ();
+ new (set) line_maps();
#endif
set->highest_location = RESERVED_LOCATION_COUNT - 1;
set->highest_line = RESERVED_LOCATION_COUNT - 1;
diff --git a/libcpp/system.h b/libcpp/system.h
index 719435df949..76420e16cfb 100644
--- a/libcpp/system.h
+++ b/libcpp/system.h
@@ -438,6 +438,10 @@ extern void fancy_abort (const char *, int, const char *) ATTRIBUTE_NORETURN;
/* Some compilers do not allow the use of unsigned char in bitfields. */
#define BOOL_BITFIELD unsigned int
+#ifdef __cplusplus
+#include <new>
+#endif
+
/* Poison identifiers we do not want to use. */
#if (GCC_VERSION >= 3000)
#undef calloc
