Question

我正在编写一个小编译器，但现在我遇到了cmake，它不会生成所有依赖对象文件。

仅编译main.cpp：

#include <iostream>
#include "lexer.h"
#include "parser.h"

int main() {
    Lexer lexer(&std::cin);
    Parser parser(&lexer);

    parser.binaryOpPrecedence['<'] = 10;
    parser.binaryOpPrecedence['+'] = 20;
    parser.binaryOpPrecedence['-'] = 20;
    parser.binaryOpPrecedence['*'] = 40;

    std::cerr << "ready> ";
    parser.getNextToken();

    parser.parse();

    return 0;
}

我的CMakeLists.txt是以下（子目录）：

set(SOURCE_FILES
    ${PROJECT_SOURCE_DIR}/src/ast/binary.h
    ${PROJECT_SOURCE_DIR}/src/ast/call.h
    ${PROJECT_SOURCE_DIR}/src/ast/expression.h
    ${PROJECT_SOURCE_DIR}/src/ast/function.h
    ${PROJECT_SOURCE_DIR}/src/ast/number.h
    ${PROJECT_SOURCE_DIR}/src/ast/prototype.h
    ${PROJECT_SOURCE_DIR}/src/ast/variable.h
    ${PROJECT_SOURCE_DIR}/src/lexer.cpp
    ${PROJECT_SOURCE_DIR}/src/parser.cpp
    PARENT_SCOPE
)

add_executable(kaleidoscope main.cpp ${SOURCE_FILES})

如上所述，只有main.cpp被编译为main.cpp.o而不是lexer.cpp和parser.cpp，因此链接器会因未解析的符号而崩溃。不知道，我做错了什么。

/usr/bin/cmake --build /home/patkar/.clion10/system/cmake/generated/d6bd25de/d6bd25de/Debug --target kaleidoscope -- -j 4
Scanning dependencies of target kaleidoscope
[100%] Building CXX object src/CMakeFiles/kaleidoscope.dir/main.cpp.o
Linking CXX executable kaleidoscope
CMakeFiles/kaleidoscope.dir/main.cpp.o: In function `Lexer':
/home/patkar/workspace/compiler-fun/kaleidoscope/src/lexer.h:49: undefined reference to `vtable for Lexer'
CMakeFiles/kaleidoscope.dir/main.cpp.o: In function `main':
/home/patkar/workspace/compiler-fun/kaleidoscope/src/main.cpp:36: undefined reference to `Parser::parse()'
CMakeFiles/kaleidoscope.dir/main.cpp.o: In function `~Lexer':
/home/patkar/workspace/compiler-fun/kaleidoscope/src/lexer.h:38: undefined reference to `vtable for Lexer'
/home/patkar/workspace/compiler-fun/kaleidoscope/src/lexer.h:38: undefined reference to `vtable for Lexer'
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make[3]: *** [src/kaleidoscope] Error 1
make[2]: *** [src/CMakeFiles/kaleidoscope.dir/all] Error 2
make[1]: *** [src/CMakeFiles/kaleidoscope.dir/rule] Error 2
make: *** [kaleidoscope] Error 2

Answer 1

好的，PARENT_SCOPE使我的SOURCE_FILES变量在当前范围内无法访问/为空：O

我需要为我的测试目标访问所有源文件。我现在创建了一个新变量PARENT_SCOPE作为解决方法。

set(SOURCE_FILES
    ${PROJECT_SOURCE_DIR}/src/ast/binary.h
    ${PROJECT_SOURCE_DIR}/src/ast/call.h
    ${PROJECT_SOURCE_DIR}/src/ast/expression.h
    ${PROJECT_SOURCE_DIR}/src/ast/function.h
    ${PROJECT_SOURCE_DIR}/src/ast/number.h
    ${PROJECT_SOURCE_DIR}/src/ast/prototype.h
    ${PROJECT_SOURCE_DIR}/src/ast/variable.h
    ${PROJECT_SOURCE_DIR}/src/lexer.cpp
    ${PROJECT_SOURCE_DIR}/src/parser.cpp
)

set(SOURCE_TEST_FILES ${SOURCE_FILES} PARENT_SCOPE)

add_executable(kaleidoscope main.cpp ${SOURCE_FILES})

CMake不生成依赖对象文件

1 个答案: