CC CXX LD AR CFLAGS LDFLAGS 等变量在./configure 前后定义的区别

本文介绍了在Makefile中定义变量的方法,包括系统环境变量与自定义变量的区别。详细解释了变量定义的位置不同所带来的作用范围的变化。

1)如果在前面定义,则这些变量成为系统的环境变量

2)如果在后面定义,则这些变量成为该目录下Makefile中的自定义变量




/opt/android-ndk-r18b/toolchains/llvm/prebuilt/linux-x86_64/bin/clang --sysroot=/opt/android-ndk-r18b/sysroot -I/include -fPIC -c -o /tmp/ffconf.3S9556Zm/test.o /tmp/ffconf.3S9556Zm/test.c /opt/android-ndk-r18b/toolchains/llvm/prebuilt/linux-x86_64/bin/clang -L/lib -L/opt/android-ndk-r18b/sysroot/usr/lib -lmpp -lunwind --sysroot=/opt/android-ndk-r18b/sysroot -o /tmp/ffconf.3S9556Zm/test /tmp/ffconf.3S9556Zm/test.o /..//bin/ld: cannot find crt1.o: No such file or directory /..//bin/ld: cannot find crti.o: No such file or directory /..//bin/ld: cannot find crtbegin.o: No such file or directory /..//bin/ld: cannot find -lmpp /..//bin/ld: cannot find -lunwind /..//bin/ld: cannot find -lgcc /..//bin/ld: cannot find -lgcc_s /..//bin/ld: cannot find -lc /..//bin/ld: cannot find -lgcc /..//bin/ld: cannot find -lgcc_s /..//bin/ld: cannot find crtend.o: No such file or directory /..//bin/ld: cannot find crtn.o: No such file or directory clang: error: linker command failed with exit code 1 (use -v to see invocation) C compiler test failed.还是出现了问题,这是命令:./configure --target-os=android --arch=aarch64 --enable-cross-compile --cross-prefix=$TOOLCHAIN/bin/$TARGET$API- --sysroot=/opt/android-ndk-r18b/sysroot --cc=$TOOLCHAIN/bin/clang --cxx=$TOOLCHAIN/bin/clang++ --enable-rkmpp --enable-libdrm --extra-cflags="-I$MPP_ROOT/include -fPIC" --enable-shared --enable-version3 --disable-static --disable-doc --extra-ldflags="-L$MPP_ROOT/lib -L/opt/android-ndk-r18b/sysroot/usr/lib -lmpp -lunwind"
03-14
/opt/android-ndk-r18b/toolchains/llvm/prebuilt/linux-x86_64/bin/clang --sysroot=/opt/android-ndk-r18b/platforms/android-21/arch-arm64 -I/include -fPIC -c -o /tmp/ffconf.dd04KREK/test.o /tmp/ffconf.dd04KREK/test.c /opt/android-ndk-r18b/toolchains/llvm/prebuilt/linux-x86_64/bin/clang -L/lib -lmpp --sysroot=/opt/android-ndk-r18b/platforms/android-21/arch-arm64 -o /tmp/ffconf.dd04KREK/test /tmp/ffconf.dd04KREK/test.o /..//bin/ld: cannot find crt1.o: No such file or directory /..//bin/ld: cannot find crti.o: No such file or directory /..//bin/ld: cannot find crtbegin.o: No such file or directory /..//bin/ld: cannot find -lmpp /..//bin/ld: cannot find -lgcc /..//bin/ld: cannot find -lgcc_s /..//bin/ld: skipping incompatible /opt/android-ndk-r18b/platforms/android-21/arch-arm64/usr/lib/libc.so when searching for -lc /..//bin/ld: skipping incompatible /opt/android-ndk-r18b/platforms/android-21/arch-arm64/usr/lib/libc.a when searching for -lc /..//bin/ld: skipping incompatible /opt/android-ndk-r18b/platforms/android-21/arch-arm64/usr/lib/libc.so when searching for -lc /..//bin/ld: skipping incompatible /opt/android-ndk-r18b/platforms/android-21/arch-arm64/usr/lib/libc.a when searching for -lc /..//bin/ld: cannot find -lc /..//bin/ld: cannot find -lgcc /..//bin/ld: cannot find -lgcc_s /..//bin/ld: cannot find crtend.o: No such file or directory /..//bin/ld: cannot find crtn.o: No such file or directory clang: error: linker command failed with exit code 1 (use -v to see invocation) C compiler test failed.问题,我的命令是./configure --target-os=android --arch=aarch64 --enable-cross-compile --cross-prefix=$TOOLCHAIN/bin/$TARGET$API- --sysroot=/opt/android-ndk-r18b/platforms/android-21/arch-arm64 --cc=$TOOLCHAIN/bin/clang --cxx=$TOOLCHAIN/bin/clang++ --enable-rkmpp --enable-libdrm --extra-cflags="-I$MPP_ROOT/include -fPIC" --extra-ldflags="-L$MPP_ROOT/lib -lmpp" --enable-shared --enable-version3 --disable-static --disable-doc
03-14
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