在C ++程序中使用C共享库

Question

我很难在使用g ++编译的程序中链接使用gcc编译的共享库。 我有一个使用以下命令通过gcc编译的共享库：

build-library: activate-library-mode activate-debug-mode build-headers build-c-files build-exe-files
@echo -e $(cyan)generating shared library...$(plain)
@for exefile in $(exefiles); do\
    echo "$(CC) $(DEBUG) $(EXELIBFLAG) -o $(BINDIR)lib`basename $$exefile .c`.so $(wildcard $(OBJDIR)*.o)";\
    $(CC) $(DEBUG) $(EXELIBFLAG) -o $(BINDIR)lib`basename $$exefile .c`.so $(wildcard $(OBJDIR)*.o);\
done

哪里：

• CC = gcc
• 调试= -g
• EXELIBFLAG =共享
• BINDIR = bin /
• exefiles = src / main.c
• * .o文件使用-fPIC，-g，-Wall一些-I和-c选项进行编译

因此，结果调用为：

gcc -g -shared -o bin/libmain.so obj/ClassElement.o obj/ClassHashTable.o obj/ClassHTCell.o obj/IdentifierList.o obj/LabelClassType.o obj/LabelHashTable.o obj/LabelHTCell.o obj/Label.o obj/lexer.o obj/lex-tools.o obj/LexVal.o obj/LocalResourceElement.o obj/LocalResourceHashTable.o obj/LocalResourceHTCell.o obj/main.o obj/main-tools.o obj/memory-tools.o obj/NodeType.o obj/parser.o obj/parser-tools.o obj/PassMode.o obj/ResourceClassType.o obj/ResourceElement.o obj/ResourceHashTable.o obj/ResourceHTCell.o obj/schemaClassType.o obj/schema.o obj/semantic.o obj/SyntaxNode.o

我在LD_LIBRARY_PATH中添加了共享库的路径，仅用于测试目的：

LD_LIBRARY_PATH=/home/koldar/Documents/git/Kaboom/custom-object-language/CustomProgrammingLanguage/bin:
export LD_LIBRARY_PATH

然后，以下程序将使用该库：

#include "Label.h"

int main(){
    Plabel l=initLabel("hello",LABEL_PACKAGE); //use library function
    printf("OK.\n");
    return 0;
}

该程序通过以下命令用g ++编译：

g++ -I /home/koldar/Documents/git/Kaboom/custom-object-language/CustomProgrammingLanguage/include/ -I /home/koldar/Documents/git/Kaboom/custom-object-language/KaboomTest/cute/ -L /media/Dati/Users/Koldar/Documents/git/Kaboom/custom-object-language/CustomProgrammingLanguage/bin -l main test.c -o "KaboomTest"

问题是g ++打印出错误：

test.c: In function ‘int main()’:
test.c:4: warning: deprecated conversion from string constant to ‘char*’
/tmp/ccF7XCBs.o: In function `main':
test.c:(.text+0x19): undefined reference to `initLabel(char*, LabelClassType)'
collect2: ld returned 1 exit status

真正的问题是，如果我使用gcc编译了test.c，那么程序可以正常运行：

gcc -I /home/koldar/Documents/git/Kaboom/custom-object-language/CustomProgrammingLanguage/include/ -I /home/koldar/Documents/git/Kaboom/custom-object-language/KaboomTest/cute/ -L /media/Dati/Users/Koldar/Documents/git/Kaboom/custom-object-language/CustomProgrammingLanguage/bin -l main test.c -o "KaboomTest"
koldar@Octav:~/Documents/git/Kaboom/custom-object-language/KaboomTest$ ./KaboomTest
OK.
koldar@Octav:~/Documents/git/Kaboom/custom-object-language/KaboomTest$ 

现在，我很确定可以在g ++编译程序中链接gcc编译的共享库，但是我该怎么做呢？ 感谢您的回答，对不起我的英语不好

Answer 1

extern "C"
{
#include "Label.h"
}

像这样。