致命错误:gnu/stubs-soft.h:没有这样的文件或目录

Question

在64位Ubuntu 16.04上交叉编译helloworld程序时,我遇到了以下错误,32位Cortex A9平台.

$ make
/usr/local/comp/poky/1.7/sysroots/x86_64-pokysdk-linux/usr/bin/arm-poky-linux-gnueabi/arm-poky-linux-gnueabi-gcc -march=armv7-a -mthumb-interwork -mtune=cortex-a9 --sysroot=/usr/local/comp/poky/1.7/sysroots/cortexa9hf-vfp-neon-poky-linux-gnueabi -Iinclude -Wall -O3 -c -o main.o main.c
In file included from /usr/local/comp/poky/1.7/sysroots/cortexa9hf-vfp-neon-poky-linux-gnueabi/usr/include/features.h:389:0,
             from /usr/local/comp/poky/1.7/sysroots/cortexa9hf-vfp-neon-poky-linux-gnueabi/usr/include/stdio.h:27,
             from main.c:5:
/usr/local/comp/poky/1.7/sysroots/cortexa9hf-vfp-neon-poky-linux-gnueabi/usr/include/gnu/stubs.h:7:29: fatal error: gnu/stubs-soft.h: No such file or directory
# include <gnu/stubs-soft.h>
                         ^
compilation terminated.
makefile:45: recipe for target 'main.o' failed
make: *** [main.o] Error 1

然后我检查stubs.h文件的内容:

$ cat /usr/local/comp/poky/1.7/sysroots/cortexa9hf-vfp-neon-poky-linux-gnueabi/usr/include/gnu/stubs.h 
/* This file is automatically generated.
   This file selects the right generated file of `__stub_FUNCTION' macros
   based on the architecture being compiled for.  */


#if !defined __ARM_PCS_VFP
# include <gnu/stubs-soft.h>
#endif
#if defined __ARM_PCS_VFP
# include <gnu/stubs-hard.h>
#endif

我要_ARM_PCS_VFP在makefile中定义吗？

Answer 1

从交叉编译器的名称"cortexa9hf-vfp-neon-poky-linux-gnueabi"开始,它针对的是采用VFP架构并启用了霓虹灯的Cortex-A9.添加-mfloat-abi=hard开关应该可以解决问题.

从GCC手册:

-mfloat-ABI =名:

指定要使用的浮点ABI.允许的值为:'soft','softfp'和'hard'.

指定'soft'会导致GCC生成包含用于浮点运算的库调用的输出.'softfp'允许使用硬件浮点指令生成代码,但仍使用soft-float调用约定.'hard'允许生成浮点指令并使用FPU特定的调用约定.

默认值取决于特定的目标配置.请注意,硬浮点和软浮点ABI不是链接兼容的; 您必须使用相同的ABI编译整个程序,并链接到一组兼容的库.