C语言 添加编译器选项而不编辑 Makefile
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Add compiler option without editing Makefile
提问by Gnufabio
I should compile a program written in C through a Makefile. I should insert into the Makefile, some option, for instance: -O2, -march=i686. How can I insert this option in the Makefile without writing into it?
我应该通过 Makefile 编译一个用 C 编写的程序。我应该在 Makefile 中插入一些选项，例如：-O2, -march=i686. 如何在不写入的情况下在 Makefile 中插入此选项？
回答by dirkgently
You should use a macro like CFLAGS. Check out GNU GCC documentation.
您应该使用像CFLAGS这样的宏。查看 GNU GCC文档。
Something like this should work:
这样的事情应该工作：
CFLAGS := $(CFLAGS) -O2 -march=i686
Or, if you prefer not to modify the makefile use:
或者，如果您不想修改 makefile，请使用：
make CFLAGS='-O2 -march=i686'
The other options will be picked up automatically though. See overriding variables.
其他选项将自动选择。请参阅覆盖变量。
