当我尝试编译我的单元测试文件时，我得到“未定义的对‘dlsym’的引用”错误。我在 Unix 系统（我在 Ubuntu 12.04 上）上读到了，将 -ldl 添加到编译器工作中，但我尝试使用 Zed 的 Shaw Makefile，但仍然没有任何反应。这是代码：
CFLAGS=-g -O2 -Wall -Wextra -Isrc -rdynamic -DNDEBUG $(OPTFLAGS)
LIBS=-ldl $(OPTLIBS)
PREFIX?=/usr/local
SOURCES=$(wildcard src/**/*.c src/*.c)
OBJECTS=$(patsubst %.c,%.o,$(SOURCES))
TEST_SRC=$(wildcard tests/*_tests.c)
TESTS=$(patsubst %.c,%,$(TEST_SRC))
TARGET=build/libex29.a
SO_TARGET=$(patsubst %.a,%.so,$(TARGET))
# The Target Build
all: $(TARGET) $(SO_TARGET) tests
dev: CFLAGS=-g -Wall -Isrc -Wall -Wextra $(OPTFLAGS)
dev: all
$(TARGET): CFLAGS += -fPIC
$(TARGET): build $(OBJECTS)
ar rcs $@ $(OBJECTS)
ranlib $@
$(SO_TARGET): $(TARGET) $(OBJECTS)
$(CC) -shared -o $@ $(OBJECTS)
build:
@mkdir -p build
@mkdir -p bin
# The Unit Tests
.PHONY: tests
tests: CFLAGS += $(TARGET)
tests: $(TESTS)
sh ./tests/runtests.sh
valgrind:
VALGRIND="valgrind --log-file=/tmp/valgrind-%p.log" $(MAKE)
# The Cleaner
clean:
rm -rf build $(OBJECTS) $(TESTS)
rm -f tests/tests.log
find . -name "*.gc*" -exec rm {} \;
rm -rf `find . -name "*.dSYM" -print`
# The Install
install: all
install -d $(DESTDIR)/$(PREFIX)/lib/
install $(TARGET) $(DESTDIR)/$(PREFIX)/lib/
记录错误：
michal@ubuntu:~/Documents/projectsc/c-skeleton$ make
ar rcs build/libex29.a src/libex29.o
ranlib build/libex29.a
cc -shared -o build/libex29.so src/libex29.o
cc -g -O2 -Wall -Wextra -Isrc -rdynamic -DNDEBUG -LIBS build/libex29.a tests/libex29_tests.c -o tests/libex29_tests
tests/libex29_tests.c: In function ‘main’:
tests/libex29_tests.c:66:1: warning: parameter ‘argc’ set but not used [-Wunused-but-set-parameter]
/tmp/ccRX6ddf.o: In function `check_function':
/home/michal/Documents/projectsc/c-skeleton/tests/libex29_tests.c:10: undefined reference to `dlsym'
/home/michal/Documents/projectsc/c-skeleton/tests/libex29_tests.c:11: undefined reference to `dlerror'
/tmp/ccRX6ddf.o: In function `test_dlopen':
/home/michal/Documents/projectsc/c-skeleton/tests/libex29_tests.c:24: undefined reference to `dlopen'
/tmp/ccRX6ddf.o: In function `test_dlclose':
/home/michal/Documents/projectsc/c-skeleton/tests/libex29_tests.c:49: undefined reference to `dlclose'
collect2: ld returned 1 exit status
make: *** [tests/libex29_tests] Error 1
正如我所说，我尝试将 '-ldl- 添加到 CFLAGS、SO_TARGET 变量，几乎所有内容，根据我的分析，这可能会有所帮助，但这并没有改变任何东西。