Makefile ifeq logical AND

问题:

I would like to check multiple conditions in an if loop of GNU make file. Here's an example:

ifeq ($(TEST_FLAG),TRUE && ($(DEBUG_FLAG),FALSE))
true statement 
else 
false statement
endif

What's the right way to do it?

回答1:

You can use ifeq with a concatenation of your values, eg.

ifeq ($(TEST_FLAG)$(DEBUG_FLAG),TRUEFALSE)
   do something
endif

It's also possible to use the Conditional functions, which are more likely to be useful in a loop (as ifeq will probably not do what you expect in a loop, it will be tested exactly once).

回答2:

Although Hasturkun's solution will work, I think the idiomatic way to write this is:

ifeq ($(TEST_FLAG),TRUE)
ifeq ($(DEBUG_FLAG),FALSE)
# Stuff
endif
endif