libvpx库的yasm编译如何生成-fPIC位置无关代码？

金斗网络-网站技术2 2015-09-12 05:01:12

我在编译时需要连接libvpx静态库，提示我需要使用-fPIC参数重新编译位置无关的libvpx库

/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/4.9/../../../../lib/libvpx.a(subpixel_mmx.asm.o): relocation R_X86_64_PC32 against symbol `vp8_bilinear_filters_x86_8' can not be used when making a shared object; recompile with -fPIC

/usr/bin/ld: final link failed: Bad value

collect2: error: ld returned 1 exit status

Makefile:518: recipe for target 'libgd.la' failed

make[2]: *** [libgd.la] Error 1

make[2]: Leaving directory '/root/libgd/libgd-2.1.1/src'

Makefile:436: recipe for target 'all' failed

make[1]: *** [all] Error 2

make[1]: Leaving directory '/root/libgd/libgd-2.1.1/src'

Makefile:331: recipe for target 'all-recursive' failed

make: *** [all-recursive] Error 1

libvpx的./configure --help里面有个--enable-pic选项，开启了无效，configure后查看Makefile中的CFLAGS和CXXFLAGS并没有加入-fPIC参数。
于是我手动在CFLAGS和CXXFLAGS还有ASFLAGS里面添加了-fPIC参数

CFLAGS+=-I$(BUILD_PFX)$(BUILD_ROOT) -I$(SRC_PATH) -fPIC

CXXFLAGS+=-I$(BUILD_PFX)$(BUILD_ROOT) -I$(SRC_PATH) -fPIC

ASFLAGS+=-I$(BUILD_PFX)$(BUILD_ROOT)/ -I$(SRC_PATH)/ -fPIC/

然后make，结果yasm报错：

    [AS] vpx_ports/emms.asm.o

yasm: FATAL: unrecognized object format `PIC/'

Makefile:179: recipe for target 'vpx_ports/emms.asm.o' failed

make[1]: *** [vpx_ports/emms.asm.o] Error 1

Makefile:17: recipe for target '.DEFAULT' failed

make: *** [.DEFAULT] Error 2

如果去掉ASFLAGS中的-fPIC-fPIC参数，前面链接的时候就会提示
/libvpx.a(subpixel_mmx.asm.o): relocation R_X86_64_PC32 against symbol `vp8_bilinear_filters_x86_8' can not be used when making a shared object; recompile with -fPIC

我改如何做才能编译位置无关的libvpx静态库？

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