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...wj, For the first question, even if I did not specify "-o fft.bc", it still generated fft.o which is also a llvm bitcode file. For the second question, I intended to generate a native executable "FFT". However, it only generate a llvm bitcode file fft.bc and a native POSIX shell excuatable named fft. Howerver, the contents of the shell executable fft is a wrapper to call "lli fft". I also asked some other people. They told me that pthread came along with the native system and was not distributed by llvm. Libpthread.so and libpthread_nonshared.so were located in /usr/li...

> According to the link, I found that during the compiling process, the option "-emit-llvm" must be added to generate immediate object *.o. > [hanfeng at os-wstation02 fft]llvm-gcc -c fft.c -emit-llvm "-emit-llvm" emits object file which contains LLVM bitcode (IR). Default file name suffix is .o, but you might want to use "-o fft.bc" to make the suffix