compile armv7 architechture fail

[NicolasKim]

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[*] check xcode version
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FF_ALL_ARCHS = arm64 x86_64
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[*] check host
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FF_ARCH=armv7
FF_BUILD_OPT=
build_root: /Users/dreamtracer/Documents/test/ijkplayer-ios/ios
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[*] check gas-preprocessor
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gasp: /Users/dreamtracer/Documents/test/ijkplayer-ios/ios/../extra/gas-preprocessor/gas-preprocessor.pl
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[*] config arch armv7
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build_name: ffmpeg-armv7
platform:   iPhoneOS
osversion:  -miphoneos-version-min=6.0
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[*] make ios toolchain ffmpeg-armv7
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build_source: /Users/dreamtracer/Documents/test/ijkplayer-ios/ios/ffmpeg-armv7
build_prefix: /Users/dreamtracer/Documents/test/ijkplayer-ios/ios/build/ffmpeg-armv7/output

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[*] configurate ffmpeg
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[*] check OpenSSL
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[*] configure
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reuse configure

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[*] compile ffmpeg
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AR	libavfilter/libavfilter.a
AR	libavformat/libavformat.a
AS	libavcodec/arm/aacpsdsp_neon.o
./libavutil/arm/asm.S:50:9: error: unknown directive
        .arch armv7-a
        ^
make: *** [libavcodec/arm/aacpsdsp_neon.o] Error 1
make: *** Waiting for unfinished jobs....