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Improve ARM compatibility

Browse source 
STANDALONE-TOOLCHAIN.html in Android NDK says:

It is recommended to use the -mthumb compiler flag to force the generation
of 16-bit Thumb-1 instructions (the default being 32-bit ARM ones).

If you want to target the 'armeabi-v7a' ABI, you will need ensure that the
following two flags are being used:

  CFLAGS='-march=armv7-a -mfloat-abi=softfp'

Note: The first flag enables Thumb-2 instructions, and the second one
      enables H/W FPU instructions while ensuring that floating-point
      parameters are passed in core registers, which is critical for
      ABI compatibility. Do *not* use these flags separately!

Thanks to Peter Osterlund for pointout this doc and for showing me
an example Makefile to follow.

No functional change.
This commit is contained in:
Marco Costalba 2013-09-01 09:16:55 -07:00
parent 0915f85895
commit aee404f532
1 changed files with 1 additions and 1 deletions
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2
src/Makefile
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@ -296,7 +296,7 @@ ifeq ($(optimize),yes)
endif
ifeq ($(arch),armv7)
CXXFLAGS += -fno-gcse
CXXFLAGS += -fno-gcse -mthumb -march=armv7-a -mfloat-abi=softfp
endif
endif