In AOSP9.0.0_r30's build log, there are clang commands like this:
prebuilts/clang/host/linux-x86/clang-4691093/bin/clang++ /OpenSource/Build/Android/9.0.0_r30/soong/.intermediates/bionic/libc/crtbegin_so/android_x86_64_core/crtbegin_so.o @/OpenSource/Build/Android/9.0.0_r30/soong/.intermediates/bionic/libm/libm/android_x86_64_core_shared/libm.so.rsp ...... FYI, it is a linking commmand.
In short, it is like:
clang++ path_to_file1 @path_to_file2 ...... What does the "@" mean here?