a configure's options such as "--extra-cflags" --- I am confused
configure, ios, iphone, macos
Solution
You can always run the `configure` script as `configure --help`; it will print a usage statement and information about many of the accepted parameters -- and usually, hopefully, the package-specific ones of interest.
That said, `--extra-cflags` would provide extra command-line switches for the C compiler, `--as` would give the path to the assembler, `--sysroot` would give an alternate installation directory, and `--extra-ldflags` would provide extra flags for the linker. Those are all fairly advanced, and you're unlikely to need to use them.
Problem
``` # configure for i386 build ./configure \ --cc=/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/gcc \ --as='gas-preprocessor.pl /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/gcc' \ --sysroot=/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator4.3.sdk \ --extra-ldflags=-L/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator4.3.sdk/usr/lib/system \ --target-os=darwin \ --arch=i386 \ --cpu=i386 \ --extra-cflags='-arch i386' \ --extra-ldflags='-arch i386' \ --prefix=compiled/i386 \ --enable-cross-compile \ --disable-armv5te \ --disable-ffmpeg \ --disable-ffplay \ --disable-ffserver \ --disable-ffprobe \ --disable-doc ``` the below will build ffmpeg static libraries for i386. but i don't know about the option's means such as "--extra-cflags"、"--extra-ldflags"、"--sysroot="、"--as=". who can tell me about those options mean ? where i can find the details explanation？ thanks . I am waitting for your help.