makefile中的“@<<”看起来很奇怪，查很多地方都没有结果。写了两个示例比较其结果：
如果makefile如下：
All:main.obj func.obj
link $**
.cpp.obj:
cl /c $<
clean:
erase *.obj
erase *.exe
输出为：
Microsoft (R) Program Maintenance Utility Version 6.00.9782.0 Copyright (C) Microsoft Corp 1988-1998. All rights reserved. cl /c main.cpp Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86 Copyright (C) Microsoft Corp 1984-1998. All rights reserved. main.cpp cl /c func.cpp Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86 Copyright (C) Microsoft Corp 1984-1998. All rights reserved. func.cpp link main.obj func.obj Microsoft (R) Incremental Linker Version 6.00.8447 Copyright (C) Microsoft Corp 1992-1998. All rights reserved.
在makefile中加入“@<<”，代码如下：
All:main.obj func.obj
link $**
.cpp.obj:
cl @<<
/c $<
<<
clean:
erase *.obj
erase *.exe
输入出：
Microsoft (R) Program Maintenance Utility Version 6.00.9782.0 Copyright (C) Microsoft Corp 1988-1998. All rights reserved. cl @C:\Users\ADMINI~1\AppData\Local\Temp\nma15980. Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86 Copyright (C) Microsoft Corp 1984-1998. All rights reserved. cl /c main.cpp main.cpp cl @C:\Users\ADMINI~1\AppData\Local\Temp\nmb15980. Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86 Copyright (C) Microsoft Corp 1984-1998. All rights reserved. cl /c func.cpp func.cpp link main.obj func.obj Microsoft (R) Incremental Linker Version 6.00.8447 Copyright (C) Microsoft Corp 1992-1998. All rights reserved.
原文：http://www.cnblogs.com/licb/p/nmake.html