From 44caaa560b8527acba99bc493040600add0fdb74 Mon Sep 17 00:00:00 2001
From: Mans Rullgard <mans@mansr.com>
Date: Sun, 16 Jan 2011 18:42:36 +0000
Subject: [PATCH] ARM: improve VFP ABI check
Recent gcc versions define __ARM_PCS or __ARM_PCS_VFP to indicate the
VFP ABI in use, and ARM RVCT defines __SOFTFP__ when using this ABI.
If none of these are defined, check $cross_prefix and $cc for the
substring "hardfloat", and finally fall back to a linker test. This
gives the correct result in most configurations.
---
configure | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/configure b/configure
index 9a68b7359f3..123de515b56 100755
--- a/configure
+++ b/configure
@@ -2526,10 +2526,18 @@ elif enabled arm; then
check_cflags -marm
nogas=die
- check_ld <<EOF && enable vfp_args
+ if check_cpp_condition stddef.h "defined __ARM_PCS_VFP"; then
+ enable vfp_args
+ elif ! check_cpp_condition stddef.h "defined __ARM_PCS || defined __SOFTFP__"; then
+ case "${cross_prefix:-$cc}" in
+ *hardfloat*) enable vfp_args; fpabi=vfp ;;
+ *) check_ld <<EOF && enable vfp_args && fpabi=vfp || fpabi=soft ;;
__asm__ (".eabi_attribute 28, 1");
int main(void) { return 0; }
EOF
+ esac
+ warn "Compiler does not indicate floating-point ABI, guessing $fpabi."
+ fi
# We have to check if pld is a nop and disable it.
check_asm pld '"pld [r0]"'
--
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