如何在树莓派2上编译gcc: raspbian jessie上gcc是armv6的?armv7的浮点什么的不就浪费?

树莓派编译gcc的一些经验和问题。

突然想在树莓派上编译gcc了gcc -v 一看 到目前修改swap分区在1g大小。gcc正在编译中。。 make失败的一次是make 没敢加-jx  用了将近24小时！！！可还是不成功

1. Using built-in specs.
   
2. COLLECT_GCC=gcc
   
3. COLLECT_LTO_WRAPPER=/usr/lib/gcc/arm-linux-gnueabihf/4.9/lto-wrapper
   
4. Target: arm-linux-gnueabihf
   
5. Configured with: ../src/configure -v --with-pkgversion='Raspbian 4.9.2-10' --with-bugurl=file:///usr/share/doc/gcc-4.9/README.Bugs --enable-languages=c,c++,java,go,d,fortran,objc,obj-c++ --prefix=/usr --program-suffix=-4.9 --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.9 --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --enable-gnu-unique-object --disable-libitm --disable-libquadmath --enable-plugin --with-system-zlib --disable-browser-plugin --enable-java-awt=gtk --enable-gtk-cairo --with-java-home=/usr/lib/jvm/java-1.5.0-gcj-4.9-armhf/jre --enable-java-home --with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-4.9-armhf --with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-4.9-armhf --with-arch-directory=arm --with-ecj-jar=/usr/share/java/eclipse-ecj.jar --enable-objc-gc --enable-multiarch --disable-sjlj-exceptions --with-arch=armv6 --with-fpu=vfp --with-float=hard --enable-checking=release --build=arm-linux-gnueabihf --host=arm-linux-gnueabihf --target=arm-linux-gnueabihf
   
6. Thread model: posix
   
7. gcc version 4.9.2 (Raspbian 4.9.2-10)

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with-arch=armv6with-fpu=vfp
树莓派2已经有vfp4了，不用可浪费了
遂改为neon-vfp4


安装上编译gcc需要的那三个东西后
我改后的configure为：（未验证勿用）

1. ../gcc-5.3.0/configure -v --with-pkgversion='Raspbian 5.3.0' --enable-languages=c,c++,objc,obj-c++ --prefix=/usr --program-suffix=-5.3 --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --with-gxx-include-dir=/usr/include/c++/5.3 --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --enable-gnu-unique-object --disable-libitm --disable-libquadmath --enable-plugin --with-system-zlib --disable-browser-plugin --with-arch-directory=arm  --enable-objc-gc --enable-multiarch --disable-sjlj-exceptions --with-arch=armv7-a --with-fpu=neon-vfpv4 --with-float=hard --enable-checking=release --build=arm-linux-gnueabihf --host=arm-linux-gnueabihf --target=arm-linux-gnueabihf --with-gmp-include=/usr/local/include --with-gmp-lib=/usr/local/lib --with-mpfr-include=/usr/local/include --with-mpfr-lib=/usr/local/lib --with-mpc-include=/usr/local/include --with-mpc-lib=/usr/local/lib

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本来想保存草稿，，没想到竟然发表了。。


目前有两个疑惑：
编译gcc的gcc是armv6  编译出来的是不是就是兼容armv6的而不是纯armv7？？

交叉编译能不能对 gcc用？？（交叉编译好像很麻烦的样子。。）

gcc里 java、Fortran什么的我用不到就删了。。

现在编译失败了。。

1. 
   
2. ^CMakefile:1065: recipe for target 'insn-recog.o' failed
   
3. make[3]: *** [insn-recog.o] Interrupt
   
4. Makefile:1065: recipe for target 'df-core.o' failed
   
5. make[3]: *** [df-core.o] Interrupt
   
6. Makefile:1065: recipe for target 'df-problems.o' failed
   
7. make[3]: *** [df-problems.o] Interrupt
   
8. Makefile:1065: recipe for target 'df-scan.o' failed
   
9. make[3]: *** [df-scan.o] Interrupt
   
10. make[3]: *** Deleting intermediate file 'gcc.pod'
    
11. Makefile:4407: recipe for target 'all-stage2-gcc' failed
    
12. make[2]: *** [all-stage2-gcc] Interrupt
    
13. Makefile:19125: recipe for target 'stage2-bubble' failed
    
14. make[1]: *** [stage2-bubble] Interrupt
    
15. Makefile:899: recipe for target 'all' failed
    
16. make: *** [all] Interrupt

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再顶～～～