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.
---
Updated to use a plain ifdef guard around the block instead of introducing
a line prefix as for e.g. ELF (since this is the only place where .arch
is used), as suggested by Janne on irc.
---
configure | 4 ++++
libavutil/arm/asm.S | 2 ++
2 files changed, 6 insertions(+)
diff --git a/configure b/configure
index c7d0363..029ae9e 100755
--- a/configure
+++ b/configure
@@ -1661,6 +1661,7 @@ SYSTEM_FUNCS="
"
TOOLCHAIN_FEATURES="
+ as_arch_directive
as_dn_directive
as_fpu_directive
as_func
@@ -4372,6 +4373,9 @@ 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 a791e80..0857485 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
--
2.7.4
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