c - 在我的 makefile 中设置我的 LD_LIBRARY_PATH 有问题

Question

我试图在我的 makefile 中设置我的 LD_LIBRARY_PATH，这样我就不必在执行“make all”后运行命令来设置它。但是，尽管命令已执行，但当我尝试使用 ./driver 时，我得到了

./driver: error while loading shared libraries: libparser.so: cannot open shared object file: No such file or directory.

当我在收到该错误(在 makefile 之外)后执行命令时，它已修复。您对我做错了什么有任何想法吗？这是我当前的 Makefile:

# OPTIONAL: Set these variables as required.
CFLAGS := -g -Wall -std=c99
LDFLAGS :=
LDLIBS :=

all: static-driver driver setenvp

# OPTIONAL: COMPLETE THIS TARGET
# This target produces an object file for making libraries.
parser.o: parser.c
    cc -c -fPIC $(CFLAGS) parser.c

# COMPLETE THIS TARGET
# This target produces the dynamic library.
lib/libparser.so: parser.o
    gcc -shared -o libparser.so parser.o

# COMPLETE THIS TARGET
# This target produces the executable using the dynamic library
driver: driver.c lib/libparser.so
    gcc driver.c -I$(PWD) -L$(PWD)/lib -o driver -lparser

# This target produces the executable using static library
static-driver: driver.c lib/test.a
    $(CC) $(CFLAGS) driver.c -I$(PWD) lib/test.a -o static-driver

setenvp:
    export LD_LIBRARY_PATH=$(PWD)/lib

.PHONY: clean
clean:
    rm -fv static-driver driver
    rm -fv lib/libparser.so
    rm -fv *.o *.txt *.bin
    rm -fv *~ \#*\# *.swp

Answer 1

由于每一行都是在一个新的shell环境中执行的，所以你必须在命令之前为要继承的任何内容添加前缀。那是你可能想要定义

MY_CC := export LD_LIBRARY_PATH=$(PWD)/lib; gcc

然后让您的目标由

target.o: target.c
    $(MY_CC) ...