在ARM下是否有gcc编译器？

Question

我知道，如果我想为ARM设备编译程序，则需要一个特殊版本的gcc，该版本在x86下运行并针对ARM进行编译（交叉编译），是否可以在ARM下针对ARM进行编译？

Answer 1

If you are happy to compile from source, any recent version of GCC can be built natively on an ARM device, targeting that ARM device. The dependencies to compile GCC and the size of the code base might give you some difficulties, but I regularly build the up-to-date GCC development branch on my Raspberry Pi 2.

Follow the instructions at: https://gcc.gnu.org/install/ to get the prerequisites you need, and when configuring the compiler use something like:

  --with-cpu=cortex-a15 --with-float=hard --with-fpu=neon --with-mode=thumb

Modifying the --with-cpu and --with-fpu options as required for your system.

If you are looking for prebuilt binaries, most distributions (and certainly Debian and Ubuntu) which run on ARM will provide you with a package you can install, just like your x86 systems.

Answer 2

Consider downloading the source code for the compiler of your choice. Here is a location that contains the source you could attempt to use.

I could see one using, on an x86 box to start, an x86 cross compiler to compile the ARM version of the compiler for your local ARM based system. Then you can use the native version going forward on your system.

Answer 3

yes there are cross compilers and yes there are native compilers. You can for example buy a raspberry pi and install one of the canned distros and that gives you a native compiler, or you can for example use qemu and run an arm distro built for one of the many systems supported by qemu simulations (and run a native compiler on that)...or just cross compile.

Answer 4

Recent Debian for Raspberry Pi 2 came with gcc 4.6. For more advanced features, such as for NEON, you can install gcc 4.8, or later. Example compile commands for different FPU options are:

 gcc 4.6
 gcc  linpack.c cpuidc.c -lm -lrt -O3 -march=armv6 -mfloat-abi=hard -mfpu=vfp -o linpackPiA6
 gcc 4.8
  gcc  linpack.c cpuidc.c -lm -lrt -O3 -mcpu=cortex-a7 -mfloat-abi=hard -mfpu=neon-vfpv4 -o linpackPiA7