未定义的参考`pthread
我在函数中创建新的线程,并且包含了pthread.h。 但它不起作用,编译时我一直收到以下错误:
对`pthread_create'的未定义引用
我用来编译的标志如下:
CFLAGS = -std = gnu99 -pthread -g -Wall -Wextra -Werror -Wmissing-declarations -Wmissing-prototypes -Werror-implicit-function-declaration -Wreturn-type -Wparentheses -Wunused -Wold-style-definition -Wundef -Wshadow -Wswitch-default -Wunreachable-code。-Wswitch-default -Wunreachable-code
编译器是gcc
Makefile文件:
CC=gcc
CFLAGS=-std=gnu99 -pthread -g -Wall -Wextra -Werror -Wmissing-declarations -Wmissing-prototypes -Werror-implicit-function-declaration -Wreturn-type -Wparentheses -Wunused -Wold-style-definition -Wundef -Wshadow -Wstrict-prototypes -Wswitch-default -Wunreachable-code
all: finder
finder: stack.o list.o finder.o
$(CC) -o mfind stack.o list.o mfind.o
stack.o: stack.c stack.h
$(CC) -c stack.c $(CFLAGS)
list.o: list.c list.h
$(CC) -c list.c $(CFLAGS)
finder.o: finder.c finder.h
$(CC) -c finder.c $(CFLAGS)
clean:
rm -f *.o finder
在编译单个翻译单元时,不需要在连接阶段使用-pthread
。 典型的方法将如下所示:
CC=gcc
CFLAGS=-std=gnu99 -g -Wall -Wextra -Werror -Wmissing-declarations -Wmissing-prototypes -Werror-implicit-function-declaration -Wreturn-type -Wparentheses -Wunused -Wold-style-definition -Wundef -Wshadow -Wstrict-prototypes -Wswitch-default -Wunreachable-code
LIBS=-pthread
all: finder
finder: stack.o list.o finder.o
$(CC) -o mfind stack.o list.o mfind.o $(LIBS)
stack.o: stack.c stack.h
$(CC) -c stack.c $(CFLAGS)
list.o: list.c list.h
$(CC) -c list.c $(CFLAGS)
finder.o: finder.c finder.h
$(CC) -c finder.c $(CFLAGS)
clean:
rm -f *.o finder
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