Makefile multiple target patterns - makefile

Question

When trying to run my makefile (https://pastebin.com/CYqsYtj9), I run into an error:
C:/STM32_Projects/blink_project/test/cpputest/build/MakefileWorker.mk:485: *** multiple target patterns. Stop.
I'm going to link the MakefileWorker.mk as well (https://pastebin.com/5JSy3HsB), even tho I'm pretty sure it's written properly since it's from https://github.com/cpputest/
So, question: why am I getting this error?
EDIT:
When I'm trying to make the makefile from Cygwin CLI, the error I get is the following:
C://STM32_Projects/blink_project//test/cpputest/build/MakefileWorker.mk:485: *** target pattern contains no '%'. Stop.
EDIT 2(Minimal, verifiable example):
// test/main.cpp
#include "CppUTest/CommandLineTestRunner.h"
int main (int ac, char ** av){
return CommandLineTestRunner::RunAllTests(ac,av);
}
so this is a simple main.cpp that my makefile should compile, other than that, you need a full repo from https://github.com/cpputest/cpputest compiled as shown in README in that repo.

Answer 1

Well, as mentioned I'm no expert when it comes to Windows and I know even less about cygwin.
But, my suspicion is that the environment you're trying to use is not well-supported or well-tested on Windows. Here's what I see:
You set:
PROJECT_DIR=C:/STM32_Projects/blink_project
TEST_DIR=$(PROJECT_DIR)/test
TEST_SRC_DIRS=$(TEST_DIR)
which means TEST_SRC_DIRS is set to C:/STM32_Projects/blink_project/test.
Next in MakefileWorker.mk you get an error because TEST_DEPS is set to objs/C:/STM32_Projects/blink_project/test/main.o ... which, I hope we can all easily see, is a totally bogus path.
So how did we get this path? Let's look backwards and see:
At line 484 we see how TEST_DEPS is set:
TEST_DEPS = $(TEST_OBJS) $(MOCKS_OBJS) ...
So, it's likely the bogus path is in TEST_OBJS. That is set at line 380:
TEST_OBJS = $(call src_to_o,$(TEST_SRC))
First, what's TEST_SRC? It's set on line 379 as the result of the user-defined macro get_src_from_dir_list with TEST_SRC_DIRS (which you set above). That macro will locate all the source files, so files that match *.cpp, *.cc, and *.c in each directory in TEST_SRC_DIRS. So based on the info output we can infer that this returns:
C:/STM32_Projects/blink_project/test/main.cpp
which is to be expected. Then we pass that to src_to_o which is a user-defined macro on line 363, which uses another user-defined macro src_to defined on line 362:
src_to = $(addprefix $(CPPUTEST_OBJS_DIR)/,$(call __src_to,$1,$2))
Oho!! Well, CPPUTEST_OBJS_DIR is set to obj at line 226, so this is very likely the start of our problem.
In a POSIX filesystem where there is no such abomination as a "drive letter", paths are fully constructable: if you have a fully-qualified path you can create another path by adding a new path as a prefix. That can't work on Windows, where the drive letter must always come first.
But let's keep going. So we see where the obj/ prefix comes from, now where does the rest of the path come from? That's the expansion of a user-defined macro __src_to defined at line 361 that starts with our source path above. What does this do? It wants to replace the .cpp extension with .o. But note this bit here:
$(if $(CPPUTEST_USE_VPATH),$(notdir $2),$2)
If CPPUTEST_USE_VPATH is true then we return notdir of the path; this would strip out all the drive and directory info and return just main.cpp which would turn into main.o and then the result would be obj/main.o, which would work fine.
But if CPPUTEST_USE_VPATH is false (which it is by default), we don't strip off the path and obj is added to the full path with the drivespec and you get a syntax error.
So. Basically, the cpputest makefiles have issues on Windows. It looks like you have one of these choices:
Either set the CPPUTEST_USE_VPATH option to Y to enable it (and read about what that option means and how to use it in the cpputest docs),
Or, remove the drive specs from your paths in your makefile and just use:
PROJECT_DIR = /STM32_Projects/blink_project
which means you need to be careful that your current drive is C: before you invoke this else it won't be able to find things.
HTH!