arm: Suppress tags about used cpu arch and extensions

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>

1 files changed, 6 insertions, 0 deletions

diff --git a/configure b/configure
index 0e182b484f..59438b833e 100755
--- a/configure
+++ b/configure
@@ -1494,6 +1494,7 @@ SYSTEM_FUNCS="
 TOOLCHAIN_FEATURES="
     as_dn_directive
     as_func
+    as_object_arch
     asm_mod_q
     attribute_may_alias
     attribute_packed
@@ -3869,6 +3870,11 @@ if enabled_any arm aarch64 || enabled_all ppc altivec && enabled asm; then
 .func test
 .endfunc
 EOF
+
+    # llvm's integrated assembler supports .object_arch from llvm 3.5
+    enabled arm && test "$objformat" = elf && check_as <<EOF && enable as_object_arch
+.object_arch armv4
+EOF
 fi
 
 check_inline_asm inline_asm_labels '"1:\n"'