如何在Makefile中移除文件扩展名？实际配置问题求助

Hey there! Let's break down what's going wrong with your current Makefile and get that test executable built correctly.

What's Causing the Problem? #

Looking at your code, there are two key issues preventing your test file from generating as expected:

1. Incorrect test file filtering: Your TESTFILE variable uses patsubst %_test.c,%,$(SRCFILES) which tries to apply the substitution to all source files. For files that don't end with _test.c, this substitution does nothing—so TESTFILE ends up containing a mix of your test target and every other source file name (without extensions), which makes the build rule confused.
2. Duplicate all targets: You've defined all twice. Make will only use the last definition, so your first all: $(TESTFILE) was being ignored entirely.

Corrected Makefile #

Here's the fixed version with explanations for the key changes:

CC=gcc
CFLAGS=-c
LDFLAGS=
# Get all .c source files
SRCFILES := $(shell find ../ -name '*.c')
# Convert all .c files to .o object files
OBJFILES := $(patsubst %.c,%.o,$(SRCFILES))
# FIRST: Filter only the test source files (ending with _test.c)
TEST_SRC := $(filter %_test.c,$(SRCFILES))
# THEN: Convert test .c files to executable names (remove .c extension)
TESTFILE := $(patsubst %.c,%,$(TEST_SRC))

# Default target: build the test executable
all: $(TESTFILE)

# Rule to build the test executable: depends on all object files
$(TESTFILE): $(OBJFILES)
	$(CC) $(LDFLAGS) $(OBJFILES) -o $@

# Rule to build object files from .c files
%.o: %.c
	$(CC) $(CFLAGS) $< -o $@

Key Fixes Explained #

• Filtering test sources: $(filter %_test.c,$(SRCFILES)) grabs only the files that match the *_test.c pattern, so TEST_SRC only contains your test code files.
• Generating test executable names: $(patsubst %.c,%,$(TEST_SRC)) takes those filtered .c files and removes the .c extension, giving you exactly the ABC_test target you want.
• Single all target: We now have one all target that explicitly depends on TESTFILE, so running make will prioritize building your test executable.
• Cleaned up syntax: Removed the stray --- characters that were cluttering your variable definitions.

Testing It Out #

Run make in your terminal—you should see your object files get built first, then the linker will combine them into your ABC_test executable (or whatever your _test.c file is named).

内容的提问来源于stack exchange，提问作者Krixen