From 7fd11fbeeb41990427b475dc0d8800d2cf15a8c4 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Martin=20Storsj=C3=B6?= <martin@martin.st>
Date: Thu, 5 Mar 2015 23:38:00 +0200
Subject: [PATCH] arm: Suppress tags about used cpu arch and extensions
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When all the codepaths using manually set .arch/.fpu code is
behind runtime detection, the elf attributes should be suppressed.

This allows tools to know that the final built binary doesn't
strictly require these extensions.

Signed-off-by: Martin Storsjö <martin@martin.st>
(cherry picked from commit dcae2e32f7d8a1ca5fb8c1e4aa81313be854dd73
and b77e335e441040a40fc6156b8e4a134745d10233)
Signed-off-by: Martin Storsjö <martin@martin.st>
---
 configure           | 6 ++++++
 libavutil/arm/asm.S | 6 ++++++
 2 files changed, 12 insertions(+)

diff --git a/configure b/configure
index 05acff576b..58e7f8b49b 100755
--- a/configure
+++ b/configure
@@ -1321,6 +1321,7 @@ HAVE_LIST="
     alsa_asoundlib_h
     altivec_h
     arpa_inet_h
+    as_object_arch
     asm_mod_q
     asm_mod_y
     atomic_cas_ptr
@@ -3650,6 +3651,11 @@ EOF
     check_inline_asm asm_mod_q '"add r0, %Q0, %R0" :: "r"((long long)0)'
     check_inline_asm asm_mod_y '"vmul.i32 d0, d0, %y0" :: "x"(0)'
 
+    # llvm's integrated assembler supports .object_arch from llvm 3.5
+    [ "$objformat" = elf ] && check_as <<EOF && enable as_object_arch
+.object_arch armv4
+EOF
+
     [ $target_os != win32 ] && enabled_all armv6t2 shared !pic && enable_weak_pic
 
 elif enabled mips; then
diff --git a/libavutil/arm/asm.S b/libavutil/arm/asm.S
index 5884e172f3..a2c1c1dd21 100644
--- a/libavutil/arm/asm.S
+++ b/libavutil/arm/asm.S
@@ -43,11 +43,17 @@
 #elif HAVE_ARMV5TE
         .arch           armv5te
 #endif
+#if   HAVE_AS_OBJECT_ARCH
+ELF     .object_arch    armv4
+#endif
 
 #if   HAVE_NEON
         .fpu            neon
+ELF     .eabi_attribute 10, 0           @ suppress Tag_FP_arch
+ELF     .eabi_attribute 12, 0           @ suppress Tag_Advanced_SIMD_arch
 #elif HAVE_VFP
         .fpu            vfp
+ELF     .eabi_attribute 10, 0           @ suppress Tag_FP_arch
 #endif
 
         .syntax unified