[FFmpeg-devel] [PATCH 17/17] ARM: improve VFP ABI check
Mans Rullgard
mans
Tue Jan 18 20:32:21 CET 2011
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 $cc for the
substring "hardfloat", and finally fall back to a linker test. This
gives the correct result in most configurations.
---
configure | 10 +++++++++-
1 files changed, 9 insertions(+), 1 deletions(-)
diff --git a/configure b/configure
index 3f7eed8..895b855 100755
--- a/configure
+++ b/configure
@@ -2526,10 +2526,18 @@ elif enabled arm; then
check_cflags -marm
nogas=die
- check_ld <<EOF && enable vfp_args
+ if check_cpp_condition stddef.h "defined __ARM_PCS_VFP"; then
+ enable vfp_args
+ elif ! check_cpp_condition stddef.h "defined __ARM_PCS || defined __SOFTFP__"; then
+ case "${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]"'
--
1.7.3.5
More information about the ffmpeg-devel
mailing list