https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98747
Bug ID: 98747
Summary: aarch64: __ARM_FEATURE_MEMORY_TAGGING is defined on
ilp32
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: nsz at gcc dot gnu.org
Target Milestone: ---
memory tagging intrinsics should be available when arm_acle.h
is included and __ARM_FEATURE_MEMORY_TAGGING is defined.
memory tagging is not supported with ILP32 so the feature test
macro should not be defined either, but gcc seems to define it
$ gcc -march=armv8.5-a+memtag -mabi=lp64 -E -dM - </dev/null |grep MEMORY
#define __ARM_FEATURE_MEMORY_TAGGING 1
$ gcc -march=armv8.5-a+memtag -mabi=ilp32 -E -dM - </dev/null |grep MEMORY
#define __ARM_FEATURE_MEMORY_TAGGING 1
i expect the following code to work with any abi and arch combination:
#include <arm_acle.h>
int *foo(int *p, unsigned long m)
{
#ifdef __ARM_FEATURE_MEMORY_TAGGING
return __arm_mte_create_random_tag(p, m);
#else
return p;
#endif
}
but with -march=armv8.5-a+memtag -mabi=ilp32 it fails
In file included from <source>:1:
<source>: In function 'foo':
<source>:6:12: error: Memory Tagging Extension does not support '-mabi=ilp32'
6 | return __arm_mte_create_random_tag(p, m);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~
Compiler returned: 1
