1FFmpeg currently uses a custom build system, this text attempts to document 2some of its obscure features and options. 3 4Makefile variables: 5 6V 7 Disable the default terse mode, the full command issued by make and its 8 output will be shown on the screen. 9 10DBG 11 Preprocess x86 external assembler files to a .dbg.asm file in the object 12 directory, which then gets compiled. Helps in developing those assembler 13 files. 14 15DESTDIR 16 Destination directory for the install targets, useful to prepare packages 17 or install FFmpeg in cross-environments. 18 19GEN 20 Set to ‘1’ to generate the missing or mismatched references. 21 22Makefile targets: 23 24all 25 Default target, builds all the libraries and the executables. 26 27fate 28 Run the fate test suite, note that you must have installed it. 29 30fate-list 31 List all fate/regression test targets. 32 33install 34 Install headers, libraries and programs. 35 36examples 37 Build all examples located in doc/examples. 38 39checkheaders 40 Check headers dependencies. 41 42alltools 43 Build all tools in tools directory. 44 45config 46 Reconfigure the project with the current configuration. 47 48tools/target_dec_<decoder>_fuzzer 49 Build fuzzer to fuzz the specified decoder. 50 51tools/target_bsf_<filter>_fuzzer 52 Build fuzzer to fuzz the specified bitstream filter. 53 54Useful standard make commands: 55make -t <target> 56 Touch all files that otherwise would be built, this is useful to reduce 57 unneeded rebuilding when changing headers, but note that you must force rebuilds 58 of files that actually need it by hand then. 59 60make -j<num> 61 Rebuild with multiple jobs at the same time. Faster on multi processor systems. 62 63make -k 64 Continue build in case of errors, this is useful for the regression tests 65 sometimes but note that it will still not run all reg tests. 66 67