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Hi,
I just begin to use ALSA lib. From a forum post, I get the usage: an@tata-HP-Elite-7100-Microtower-PC:~/alsa-lib-1.0.26/test$ arm-linux-gnueabihf-gcc latency.c -o latency.o -lasound I know '-l' means linking a library, but I don't see a library named asound (or sound) in the folder alsa-lib-1.0.29 (in my download, not 1.0.26). Furthermore, a following post says adding -lm to the above command line: an@tata-HP-Elite-7100-Microtower-PC:~/alsa-lib-1.0.26/test$ arm-linux-gnueabihf-gcc latency.c -o latency.o -lasound -lm Even more strange thing to me is there is no -l or -lm in the arm-linux-gnueabihf-gcc help message, see below please. Could you explain my above questions? Thanks in advance, .............................. $ arm-linux-gnueabihf-gcc --help Usage: arm-linux-gnueabihf-gcc [options] file... Options: -pass-exit-codes Exit with highest error code from a phase --help Display this information --target-help Display target specific command line options --help={common|optimizers|params|target|warnings|[^]{joined|separate|undocumented}}[,...] Display specific types of command line options (Use '-v --help' to display command line options of sub-processes) --version Display compiler version information -dumpspecs Display all of the built in spec strings -dumpversion Display the version of the compiler -dumpmachine Display the compiler's target processor -print-search-dirs Display the directories in the compiler's search path -print-libgcc-file-name Display the name of the compiler's companion library -print-file-name=<lib> Display the full path to library <lib> -print-prog-name=<prog> Display the full path to compiler component <prog> -print-multiarch Display the target's normalized GNU triplet, used as a component in the library path -print-multi-directory Display the root directory for versions of libgcc -print-multi-lib Display the mapping between command line options and multiple library search directories -print-multi-os-directory Display the relative path to OS libraries -print-sysroot Display the target libraries directory -print-sysroot-headers-suffix Display the sysroot suffix used to find headers -Wa,<options> Pass comma-separated <options> on to the assembler -Wp,<options> Pass comma-separated <options> on to the preprocessor -Wl,<options> Pass comma-separated <options> on to the linker -Xassembler <arg> Pass <arg> on to the assembler -Xpreprocessor <arg> Pass <arg> on to the preprocessor -Xlinker <arg> Pass <arg> on to the linker -save-temps Do not delete intermediate files -save-temps=<arg> Do not delete intermediate files -no-canonical-prefixes Do not canonicalize paths when building relative prefixes to other gcc components -pipe Use pipes rather than intermediate files -time Time the execution of each subprocess -specs=<file> Override built-in specs with the contents of <file> -std=<standard> Assume that the input sources are for <standard> --sysroot=<directory> Use <directory> as the root directory for headers and libraries -B <directory> Add <directory> to the compiler's search paths -v Display the programs invoked by the compiler -### Like -v but options quoted and commands not executed -E Preprocess only; do not compile, assemble or link -S Compile only; do not assemble or link -c Compile and assemble, but do not link -o <file> Place the output into <file> -pie Create a position independent executable -shared Create a shared library -x <language> Specify the language of the following input files Permissible languages include: c c++ assembler none 'none' means revert to the default behavior of guessing the language based on the file's extension Options starting with -g, -f, -m, -O, -W, or --param are automatically passed on to the various sub-processes invoked by arm-linux-gnueabihf-gcc. In order to pass other options on to these processes the -W<letter> options must be used. For bug reporting instructions, please see: <https://bugs.launchpad.net/gcc-linaro>. |
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