一个GCC问题，-MMD的
一个project的Makefile中，有这么几行：9 .c.o:10 $(CC) $(CFLAGS) -MMD -o $@ -c $<
11 @cp $*.d $*.P; \
12 sed -e 's/#.*//' -e 's/^[^:]*: *//' -e 's/ *\\$//' \
13 -e '/^$/ d' -e 's/$/ :/' < $*.d >> $*.P; \
14 rm -f $*.d
15
当$@是 AMD/MSR-K6时， gcc有时在当前目录产生MSR-K6.d文件，有时产生AMD/MSR-K6.d文件。 RHEL5/Fedora8是第一种情况，而有人说Fedora12、13是第二种情况。
这就导致第11行的cp命令没法写。如果指定cp的源文件是$*.d，则在F8、RHEL上出错； 如果指定$(*F).d，则在F12、F13上出错。
有没有办法，强制gcc产生AMD/MSR-K6.d？也就是说，即使指定了-o选项，也要gcc采用 输入文件的pathname、只是把*.c换成*.d？
man gcc这么说的：
-MD -MD is equivalent to -M -MF file, except that -E is not implied.The driver determines file based on whether an -o
option is given.If it is, the driver uses its argument but with a suffix of .d, otherwise it take the basename of the
input file and applies a .d suffix.
If -MD is used in conjunction with -E, any -o switch is understood to specify the dependency output file (but
@pxref{dashMF,,-MF}), but if used without -E, each -o is understood to specify a target object file.
Since -E is not implied, -MD can be used to generate a dependency output file as a side-effect of the compilation pro-
cess.
-MMD
Like -MD except mention only user header files, not system header files. 或者可以考虑在cp之前，加一条判断语句
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