Another make horror example. Guess what this does. (Don't use Make, unless you really know how it works, by which time you probably decide against it.)

Makefile

# Let's assume COMPILER was for some accidental reason not set.
# COMPILER=gcc
CFLAGS = -O2 -Wall

all:
	$(COMPILER) $(CFLAGS) --version

Solution.txt

# Despite utter failure, this make invocation exits with code 0 (success)!

$ make
O2 -Wall --version
make: O2: Command not found
Makefile:5: recipe for target 'all' failed
make: [all] Error 127 (ignored)

$ echo $?
0

# This makes sense if you have read the Make manual, and justifies Make as the Top 1
# of languages where code looks correct when it is utterly wrong.