arm cross compile Q&A

博客记录了几个常见编程问题及对应解决办法。如makefile设置动态段大小失败,需删除-lc;配置xvid有两种configure命令;crt1.o报错要将-lm作为最后参数;获取磁盘空闲大小可用statfs,注意计算时避免溢出。

Q: failed to set dynamic section sizes
A: delete -lc from makefile.
Q: how to configure xvid configure
A: ./configure --host arm-linux --build i686-linux --disable-profile --enable-add-ons --enable-shared  --enable-omitfp
./configure --host arm-linux --build i686-linux --disable-profile --enable-add-ons --disable-shared  --enable-omitfp --enable-static-nss
Q: crt1.o error
A: -lm add as last argumnet.

Q:how to get the free size of disk?

A: use statfs but notes. k=free*size/1024 ; maybe free*size overout the long so first size/1024 then *free.

Cross-compiling Parsec benchmark for ARM architecture involves setting up a build environment on your host machine (likely x86 or x64) that can generate code for ARM targets. Here's a general outline of the steps: 1. **Install required tools**: Ensure you have installed a compiler and toolchain that supports ARM, like `gcc-arm-none-eabi` or `clang-arm`. 2. **Set up target environment**: You'll need to configure the toolchain with the correct paths and settings for the ARM target. This may involve creating a separate configuration file or specifying flags when invoking the compiler. ```sh export CC=arm-none-eabi-gcc export CXX=arm-none-eabi-g++ ``` 3. **Download Parsec**: Download the latest version of Parsec, which is a benchmarking suite, and extract it to a suitable location. 4. **Configure Makefile**: If Parsec has a Makefile, modify it to specify the target architecture. Look for lines similar to `CC`, `CFLAGS`, or `LDFLAGS`. Add or update them as needed, using the ARM-specific versions. 5. **Build for ARM**: Run `make clean && make` in the Parsec directory, replacing `make` with the appropriate command for your build system (e.g., `ninja` if you're using Ninja). ```sh make TARGET=arm-linux-gnueabihf ``` 6. **Test on ARM device or emulator**: Copy the generated `.elf` (executable) file to an ARM device or use an emulator to run it. **Related questions:** 1. What specific version of the ARM toolchain do I need? 2. How can I deal with dependencies if they don't have ARM builds available? 3. Are there any libraries or patches I need to include for compatibility with Parsec on ARM?
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