[英]can't find .so library -l in makefile
I am new to makefiles, I want to make an.so library and use it in main.o file, I want to use the library from the current directory.我是makefile的新手,我想制作一个.so库并在main.o文件中使用它,我想使用当前目录中的库。 how can I make this works?
我怎样才能使它起作用?
CFLAGS = -Wall -g
CC = g++
all: main.o mylib.so
$(CC) main.o mylib.so -o runProg
mylib.so : b1.o a1.o head1.h header2.h header3.h
$(CC) $(CFLAGS) -shared -fPIC -o mylib.so b1.o a1.o
b1.o: b1.cc b1.h
$(CC) $(CFLAGS) -fPIC b1.cc
a1.o: a1.cc
$(CC) $(CFLAGS) -fPIC a1.cc
main.o: main.cc
$(CC) $(CFLAGS) main.cc -L. -lmylib
error i am getting:我得到的错误:
c:/mingw/bin/../lib/gcc/mingw32/6.3.0/../../../../mingw32/bin/ld.exe: cannot find -lmylib
collect2.exe: error: ld returned 1 exit status
makefile:28: recipe for target 'main.o' failed
mingw32-make: *** [main.o] Error 1
any help and correction to make this work is really appreciated!非常感谢任何帮助和纠正这项工作!
So a few things wrong.所以有几件事不对。 When you are using
$(CC)
for compilation only, you must specify -c
.当您仅使用
$(CC)
进行编译时,您必须指定-c
。 So所以
b1.o: b1.cc b1.h
$(CC) -c $(CFLAGS) -fPIC b1.cc
a1.o: a1.cc
$(CC) -c $(CFLAGS) -fPIC a1.cc
Going from main.cc to main.o is a compilation step, so doesn't need the shared library (but does need the -c
option).从 main.cc 到 main.o 是一个编译步骤,因此不需要共享库(但确实需要
-c
选项)。 So所以
main.o: main.cc
$(CC) -c $(CFLAGS) main.cc
The program linking step does need the library options and should mention the file being produced (rather than all
).程序链接步骤确实需要库选项,并且应该提及正在生成的文件(而不是
all
)。 So所以
runProg: main.o mylib.so
$(CC) main.o -o runProg -L. -lmylib
Haven't checked anything, but hopefully that helps.没有检查任何东西,但希望这会有所帮助。 No doubt if anything is wrong it will be corrected.
毫无疑问,如果有任何错误,它将被纠正。
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