如何解开并行make -j编译器消息？

Question

[当我使用make -j并行化编译命令时，并发命令中的任何编译器消息（警告/错误）都将被交错（毫不奇怪）。我想知道是否有办法unangle这些消息。

例如，使用make -j，我可能会看到类似的内容：

Scanning dependencies of target test
[ 33%] Building CXX object CMakeFiles/test.dir/C.cpp.o
[ 33%] Building CXX object CMakeFiles/test.dir/B.cpp.o
[ 50%] Building CXX object CMakeFiles/test.dir/A.cpp.o
[ 66%] Building CXX object CMakeFiles/test.dir/main.cpp.o
[ 83%] Building CXX object CMakeFiles/test.dir/D.cpp.o
/tmp/B.cpp:3:1: warning: control reaches end of non-void function [-Wreturn-type]
}
^
/tmp/C.cpp:3:1: warning: control reaches end of non-void function [-Wreturn-type]
}
^
1 warning generated.
1 warning generated.
/tmp/A.cpp:3:1: warning: control reaches end of non-void function [-Wreturn-type]
}
^
1 warning generated.
/tmp/D.cpp:3:1: warning: control reaches end of non-void function [-Wreturn-type]
}
^
1 warning generated.
[100%] Linking CXX executable test
[100%] Built target test

每个.cpp都会触发警告，但它们以任意顺序交错。相反，如果我发出make，则会得到所需的顺序输出：

make 
[ 16%] Building CXX object CMakeFiles/test.dir/A.cpp.o
/tmp/A.cpp:3:1: warning: control reaches end of non-void function [-Wreturn-type]
}
^
1 warning generated.
[ 33%] Building CXX object CMakeFiles/test.dir/B.cpp.o
/tmp/B.cpp:3:1: warning: control reaches end of non-void function [-Wreturn-type]
}
^
1 warning generated.
[ 50%] Building CXX object CMakeFiles/test.dir/C.cpp.o
/tmp/C.cpp:3:1: warning: control reaches end of non-void function [-Wreturn-type]
}
^
1 warning generated.
[ 66%] Building CXX object CMakeFiles/test.dir/D.cpp.o
/tmp/D.cpp:3:1: warning: control reaches end of non-void function [-Wreturn-type]
}
^
1 warning generated.
[ 83%] Building CXX object CMakeFiles/test.dir/main.cpp.o
[100%] Linking CXX executable test
[100%] Built target test

但是很明显，我没有利用并行构建的优势。

在并行构建期间，有没有办法从每个命令收集警告/错误？

（（我并没有超级附加到make。如果ninja或其他受cmake支持的命令行（非GUI IDE）构建系统可以执行此操作，那么我会接受它们。

Answer 1

您应使用output sync option。