Hi,
I have a c file foo.c:
int main(void)
{
#ifdef FOO
printf("FOO!\n");
#endif
#ifdef BAR
printf("BAR!\n");
#endif
return 0;
}
and a Makefile may be like this:
CPPFLAGS=-DFOO
a.out:foo.o
gcc -o $@ $^
%.o:%.c
gcc -c $< ${CPPFLAGS}
if I make it and run a.out (I am on a GNU Make 3.81), the output is
FOO!. If I want to print out BAR! or FOO!BAR!, I could always append -
DBAR onto CPPFLAGS.
So, my question is: what if I want to append -DBAR on the command
line?
I tried: make CPPFLAGS+=-DBAR
But it will completely replace the defined CPPFLAGS in the Makefile.
Obviously, the one defined on the command line has the precedence.
Is this doable through command line arguments to make?
Many thanks!
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