https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121551
Bug ID: 121551
Summary: #include <emmintrin.h> fails with -xc++ -ffreestanding
Product: gcc
Version: 15.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: blubban at gmail dot com
Target Milestone: ---
#include <emmintrin.h>
-xc++ -ffreestanding (does not reproduce with -xc)
Result:
/opt/compiler-explorer/gcc-15.2.0/lib/gcc/x86_64-linux-gnu/15.2.0/include/mm_malloc.h:34:41:
error: 'size_t' has not been declared
34 | extern "C" int posix_memalign (void **, size_t, size_t) throw ();
| ^~~~~~
/opt/compiler-explorer/gcc-15.2.0/lib/gcc/x86_64-linux-gnu/15.2.0/include/mm_malloc.h:28:1:
note: 'size_t' is defined in header '<cstddef>'; this is probably fixable by
adding '#include <cstddef>'
27 | #include <stdlib.h>
+++ |+#include <cstddef>
28 |
/opt/compiler-explorer/gcc-15.2.0/lib/gcc/x86_64-linux-gnu/15.2.0/include/mm_malloc.h:54:3:
error: 'free' was not declared in this scope
54 | free (__ptr);
| ^~~~
/opt/compiler-explorer/gcc-15.2.0/lib/gcc/x86_64-linux-gnu/15.2.0/include/mm_malloc.h:28:1:
note: 'free' is defined in header '<cstdlib>'; this is probably fixable by
adding '#include <cstdlib>'
27 | #include <stdlib.h>
+++ |+#include <cstdlib>
28 |
plus several more complaints about size_t, some of which suggest std::size_t
instead.
Expected: Gate the mm_malloc.h include on __STDC_HOSTED__, and leave actual
intrinsics like _mm_loadu_si128() available.
Works in GCC 12, fails (with slightly different errors) in 13, 14 and 15.
Likely related to bug 106953.
(The unhelpful suggestion to include stdlib.h again is bug 121549.)
https://godbolt.org/z/64haeKas3
