From 59cee42d7d22530e66a155305389e29679b11f78 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Martin=20Storsj=C3=B6?= <martin@martin.st>
Date: Wed, 3 May 2017 11:18:51 +0300
Subject: [PATCH] arm: Check for the .arch directive in configure
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When targeting windows, the .arch directive isn't available.

So far, when building for windows, we've always used gas-preprocessor,
both when using msvc's armasm and when using clang. Lately, clang/llvm
has implemented the last missing piece (altmacro support) for building
our assembly without gas-preprocessor. This means that we now build
for arm/windows with clang without any extra compatibility layer.

Signed-off-by: Martin Storsjö <martin@martin.st>
---
 configure           | 4 ++++
 libavutil/arm/asm.S | 2 ++
 2 files changed, 6 insertions(+)

diff --git a/configure b/configure
index 6f696c9ab5..d70e61593a 100755
--- a/configure
+++ b/configure
@@ -1661,6 +1661,7 @@ SYSTEM_FUNCS="
 "
 
 TOOLCHAIN_FEATURES="
+    as_arch_directive
     as_dn_directive
     as_fpu_directive
     as_func
@@ -4376,6 +4377,9 @@ EOF
 
     check_inline_asm asm_mod_q '"add r0, %Q0, %R0" :: "r"((long long)0)'
 
+    check_as <<EOF && enable as_arch_directive
+.arch armv7-a
+EOF
     check_as <<EOF && enable as_dn_directive
 ra .dn d0.i16
 .unreq ra
diff --git a/libavutil/arm/asm.S b/libavutil/arm/asm.S
index a791e80c57..08574852b5 100644
--- a/libavutil/arm/asm.S
+++ b/libavutil/arm/asm.S
@@ -46,6 +46,7 @@
 #   define FPU @
 #endif
 
+#if HAVE_AS_ARCH_DIRECTIVE
 #if   HAVE_NEON
         .arch           armv7-a
 #elif HAVE_ARMV6T2
@@ -55,6 +56,7 @@
 #elif HAVE_ARMV5TE
         .arch           armv5te
 #endif
+#endif
 #if   HAVE_AS_OBJECT_ARCH
 ELF     .object_arch    armv4
 #endif