From 1a7746603bca1022b63c406c9459525312a2b2b6 Mon Sep 17 00:00:00 2001 From: Michael Brown Date: Fri, 28 Jul 2017 13:50:35 +0100 Subject: [PATCH] [build] Fix use of inline assembly on GCC 4.8 ARM64 builds The inline assembly used in include/errno.h to generate the einfo blocks requires the ability to generate an immediate constant with no immediate-value prefix (such as the dollar sign for x86 assembly). We currently achieve this via the undocumented "%c0" form of operand. This causes an "invalid operand prefix" error on GCC 4.8 for ARM64 builds. Fix by switching to the equally undocumented "%a0" form of operand, which appears to work correctly on all tested versions of GCC. Reported-by: Benjamin S. Allen Signed-off-by: Michael Brown --- src/include/errno.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/src/include/errno.h b/src/include/errno.h index 342384fa..e80bf9ca 100644 --- a/src/include/errno.h +++ b/src/include/errno.h @@ -262,10 +262,10 @@ static inline void eplatform_discard ( int dummy __unused, ... ) {} ".align 8\n\t" \ "\n1:\n\t" \ ".long ( 4f - 1b )\n\t" \ - ".long %c0\n\t" \ + ".long %a0\n\t" \ ".long ( 2f - 1b )\n\t" \ ".long ( 3f - 1b )\n\t" \ - ".long %c1\n\t" \ + ".long %a1\n\t" \ "\n2:\t.asciz \"" __einfo_desc ( einfo ) "\"\n\t" \ "\n3:\t.asciz \"" __FILE__ "\"\n\t" \ ".align 8\n\t" \