我在我的项目中使用pow()的{{1}}函数。 我向math.h添加了-lm标记，但我仍然在尝试运行Makefile时出现以下错误：
make如何解决此问题？
这里是完整的rudp_comm.c:(.text+0x3c1): undefined reference to `pow'
rudp_comm.c:(.text+0x458): undefined reference to `pow'
：
Makefile当然CC := gcc
CFLAGS := -Wall -Wextra -Wpedantic -O3 -lm
SRC := client/client.c client/client_func.c client/client_func.h server/server.c server/server_func.c server/server_func.h common/conf.c common/conf.h common/file_list.c common/file_list.h common/rudp_comm.c common/rudp_comm.h
OBJ := $(SRC:.c=.o)
.PHONY: all
all: client/client server/server
client/client: client/client.o client/client_func.o common/conf.o common/file_list.o common/rudp_comm.o
client/client.o: client/client.c client/client_func.h common/rudp_comm.h
client/client_func.o: client/client_func.c client/client_func.h common/conf.h common/file_list.h
server/server: server/server.o server/server_func.o common/conf.o common/file_list.o common/rudp_comm.o
server/server.o: server/server.c server/server_func.h common/rudp_comm.h
server/server_func.o: server/server_func.c server/server_func.h common/conf.h common/file_list.h
common/conf.o: common/conf.c common/conf.h
common/file_list.o: common/file_list.c common/file_list.h
common/rudp_comm.o: common/rudp_comm.c common/rudp_comm.h
clean:
rm -f client/*.o server/*.o common/*.o core
cleanall:
rm -f client/*.o server/*.o common/*.o core client/client server/server
我包含了库（rudp_comm.c），所以我真的无法猜出问题所在！
答案 0 :(得分：2)
-lm应该进入LDLIBS，而不是Makefile中的CFLAGS。
LDLIBS = -lm
请参阅https://www.gnu.org/software/make/manual/html_node/Implicit-Variables.html
虽然CFLAGS也传递给了编译器，但``-lm needs to be at the *end* of the commandline. That's why specifying it in CFLAGS doesn't work because it needs to be passed at the *linking* stage (specifying - lm`在末尾提供了相同的功能。）