如何解决CMake函数“未在此范围内声明”错误
我是CMake的新手,并且一直在阅读博客以使它生效。当所有文件都在同一个目录中时,我有一个cmake文件正在工作,但似乎无法正常工作-包含目录给我带来了麻烦。在这最后一次尝试中,我引用了this堆栈溢出线程。这是我最近一次使它起作用。请帮忙。
文件树
$ tree
.
├── CMakeLists.txt
├── include
│ ├── CMakeLists.txt
│ └── math.h
├── src
│ ├── CMakeLists.txt
│ └── math.c
└── testy
├── CMakeLists.txt
└── math.cpp
3 directories,7 files
CMake文件
$ more CMakeLists.txt
cmake_minimum_required(VERSION 3.1)
project(iamtesting)
enable_testing()
add_subdirectory(include)
add_subdirectory(src)
add_subdirectory(testy)
$ more include/CMakeLists.txt
add_library(include INTERFACE)
target_include_directories(include INTERFACE ./)
$ more src/CMakeLists.txt
add_library(src STATIC math.c)
target_include_directories(src PUBLIC ./)
$ more testy/CMakeLists.txt
set(TEST_EXE_NAME math)
add_executable(${TEST_EXE_NAME} math.cpp)
target_include_directories(${TEST_EXE_NAME} PUBLIC ./)
target_link_libraries(${TEST_EXE_NAME} src)
add_test(NAME "testDatabase" COMMAND ${TEST_EXE_NAME})
CMake
$ cmake CMakeLists.txt
-- The C compiler identification is GNU 7.5.0
-- The CXX compiler identification is GNU 7.5.0
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Configuring done
-- Generating done
-- Build files have been written to: /home/jason/gtest
制作
$ make
Scanning dependencies of target src
[ 25%] Building C object src/CMakeFiles/src.dir/math.c.o
/home/jason/gtest/src/math.c: In function ‘main’:
/home/jason/gtest/src/math.c:5:24: warning: implicit declaration of function ‘sum’ [-Wimplicit-function-declaration]
printf("10+20=%d\n",sum(10,20));
^~~
[ 50%] Linking C static library libsrc.a
[ 50%] Built target src
Scanning dependencies of target math
[ 75%] Building CXX object testy/CMakeFiles/math.dir/math.cpp.o
In file included from /usr/include/gtest/gtest.h:1874:0,from /home/jason/gtest/testy/math.cpp:1:
/home/jason/gtest/testy/math.cpp: In member function ‘virtual void widget_ok_Test::TestBody()’:
/home/jason/gtest/testy/math.cpp:5:13: error: ‘sum’ was not declared in this scope
ASSERT_EQ(sum(1,1),2);
^
/home/jason/gtest/testy/math.cpp:5:3: error: template argument 1 is invalid
ASSERT_EQ(sum(1,2);
^
testy/CMakeFiles/math.dir/build.make:62: recipe for target 'testy/CMakeFiles/math.dir/math.cpp.o' failed
make[2]: *** [testy/CMakeFiles/math.dir/math.cpp.o] Error 1
CMakeFiles/Makefile2:158: recipe for target 'testy/CMakeFiles/math.dir/all' failed
make[1]: *** [testy/CMakeFiles/math.dir/all] Error 2
Makefile:94: recipe for target 'all' failed
make: *** [all] Error 2
Src文件
$ more src/math.c
#include <stdio.h>
#include "math.h"
int main() {
printf("10+20=%d\n",20));
return 0;
}
int sum(int x,int y) {
return x + y;
}
$ more include/math.h
#define _MATH_H_
int sum(int,int);
$ more src/math.c
#include <stdio.h>
#include "math.h"
int main() {
printf("10+20=%d\n",int y) {
return x + y;
}
$ more testy/math.cpp
#include "gtest/gtest.h"
#include "math.h"
TEST(widget,ok) {
ASSERT_EQ(sum(1,2);
}
int main(int argc,char **argv) {
testing::InitGoogleTest(&argc,argv);
return RUN_ALL_TESTS();
}
解决方法
您的设置存在很多问题:
-
不需要
-
libInclude
(在include/CMakeLists.txt
中定义)。您需要创建一个库libSrc
,该库具有通过include
添加的target_include_directories
目录。 -
src
文件夹不应通过target_include_directories
添加,因为它仅存储实现您功能的源文件,并且在任何地方都绝不能用作#include
。 - 每个程序中只能有一个
main
函数,因此很可能应该从main
中删除src/math.c
。您的可执行文件应该有一个main.cpp
,它会链接libSrc
,测试中应该有一个main
方法(对于您的情况,math.cpp
,您正在链接{{1} }正确地存在) -
libSrc
应具有正确的include guard
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