From 69043d02936bb0579ac59b4ee1ed8dec38c38db7 Mon Sep 17 00:00:00 2001 From: Landon Fuller Date: Sat, 18 Sep 2010 15:32:08 -0700 Subject: [PATCH] Work-around libffi's FP ABI detection. On iOS, we must use the AAPCS floating point return value calling conventions. libffi's ARM implementation will only use these conventions if __SOFTFP__ is defined, which is not the case when GCC's -mfloat-abi defaults to 'softfp' instead of 'soft'. To work around this we manually define __SOFTFP__ for Apple platforms in the ARM-specific sysv.S. See also: http://developer.apple.com/library/ios/#documentation/Xcode/Conceptual/iPhoneOSABIReference/Introduction/Introduction.html http://infocenter.arm.com/help/topic/com.arm.doc.ihi0042d/IHI0042D_aapcs.pdf --- src/arm/sysv.S | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/src/arm/sysv.S b/src/arm/sysv.S index 9064318..dc5fe36 100644 --- a/src/arm/sysv.S +++ b/src/arm/sysv.S @@ -34,6 +34,12 @@ #define CONCAT1(a, b) CONCAT2(a, b) #define CONCAT2(a, b) a ## b +/* Use the SOFTFP return value ABI on Mac OS X, as per the iOS ABI + Function Call Guide */ +#ifdef __APPLE__ +#define __SOFTFP__ +#endif + /* Use the right prefix for global labels. */ #define CNAME(x) CONCAT1 (__USER_LABEL_PREFIX__, x) #else -- 2.7.4