C语言 简单 Makefile 的问题：对符号 'cos@@GLIBC_2.2.5' 的未定义引用
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Issue with simple Makefile: undefined reference to symbol 'cos@@GLIBC_2.2.5'
提问by jul
I'm trying to compìle some test C code using a Makefile.
The main.cfile includes two headers:
我正在尝试使用 Makefile 编译一些测试 C 代码。该main.c文件包括两个标题：
#include "circle_buffer.h"
#include "window.h"
and when I execute the following Makefile
当我执行以下 Makefile 时
# compiler
CC=gcc
# compiler flags:
# -g adds debugging information to the executable file
# -Wall turns on most, but not all, compiler warnings
CFLAGS=
# include path
INCLUDES =
# library path and names
LIBS=-L/usr/lib/x86_64-linux-gnu -lsndfile
MAIN = test
$(MAIN): main.o circle_buffer.o window.o
$(CC) main.o circle_buffer.o window.o -o $(MAIN) $(LIBS)
main.o: main.c circle_buffer.h window.h
$(CC) -c main.c $(INCLUDES)
circle_buffer.o: circle_buffer.c circle_buffer.h
$(CC) -c circle_buffer.c $(INCLUDES)
window.o: window.h
$(CC) -c window.c $(INCLUDES)
.PHONY: clean
clean:
rm -rf *o $(MAIN)
I get
我得到
xxx@xxx:~/source$ make
gcc -c main.c
gcc -c circle_buffer.c
gcc -c window.c
gcc main.o circle_buffer.o window.o -o test -L/usr/lib/x86_64-linux-gnu -lsndfile
/usr/bin/ld: window.o: undefined reference to symbol 'cos@@GLIBC_2.2.5'
//lib/x86_64-linux-gnu/libm.so.6: error adding symbols: DSO missing from command line
collect2: error: ld returned 1 exit status
make: *** [test] Error 1
If I remove #include "window.h"from main.c, and all the references to window.o/h/c in the Makefile, it works.
如果我#include "window.h"从main.c, 以及 Makefile 中对 window.o/h/c 的所有引用中删除，它就可以工作。
What am I missing? Where am I breaking the rule
我错过了什么？我在哪里违反规则
target: dependencies
[tab] system command
?
?
回答by nos
Sounds like the math library, libmneeds to be linked in. Add -lmto the linking stage.
听起来像数学库，libm需要链接进去。添加-lm到链接阶段。
LIBS=-L/usr/lib/x86_64-linux-gnu -lsndfile -lm
回答by Andrey Tzar
Also try to use c++ instead of gcc compiler. It includes this library by default.
也尝试使用 c++ 而不是 gcc 编译器。它默认包含这个库。
