在Debian上查找GeographicLib中的CMake
在Debian上，我安装了cmake和地理库，如下所示：
stew@stewbian:~$apt-get install build-essential cmake libgeographic-dev我的CMakeLists.txt文件如下所示：
cmake_minimum_required(VERSION 3.7)
project(geoexample)
find_package(GeographicLib REQUIRED)
add_executable(geoexample main.cpp)
target_include_directories(geoexample PRIVATE ${GeographicLib_INCLUDE_DIRS})
target_compile_definitions(geoexample PRIVATE ${GeographicLib_DEFINITIONS})
target_link_libraries (geoexample ${GeographicLib_LIBRARIES})我的main.cpp也非常简单(直接取自示例)：
#include <iostream>
#include <GeographicLib/Geodesic.hpp>
using namespace std;
using namespace GeographicLib;
int main() {
const Geodesic& geod = Geodesic::WGS84();
// Distance from JFK to LHR
double
lat1 = 40.6, lon1 = -73.8, // JFK Airport
lat2 = 51.6, lon2 = -0.5; // LHR Airport
double s12;
geod.Inverse(lat1, lon1, lat2, lon2, s12);
cout << s12 / 1000 << " km\n";
return 0;
}当我运行mkdir build && cd build && cmake ..时
stew@stewbian:~/src/geoexample/build$ cmake ..
CMake Error at CMakeLists.txt:3 (find_package):
By not providing "FindGeographicLib.cmake" in CMAKE_MODULE_PATH this
project has asked CMake to find a package configuration file provided by
"GeographicLib", but CMake did not find one.我认为在默认情况下，cmake搜索/usr/share/cmake-3.7/Modules，但是libgeographic似乎已经将其Find*.cmake安装到/usr/share/cmake/geographiclib/FindGeographicLib.cmake中。这是令人沮丧的，但是我自己(加上每个需要编译我的代码的人)应该能够在这个简单的情况下使用解决方案(如果我还需要从旧位置包含类似FindBoost.cmake的内容，它就不会工作得那么好)。
stew@stewbian:~/src/geoexample/build$ cmake .. -DCMAKE_MODULE_PATH=/usr/share/cmake/geographiclib
CMake Error at /usr/share/cmake-3.7/Modules/FindPackageHandleStandardArgs.cmake:138 (message):
Could NOT find GeographicLib (missing: GeographicLib_LIBRARY_DIRS
GeographicLib_INCLUDE_DIRS)
Call Stack (most recent call first):
/usr/share/cmake-3.7/Modules/FindPackageHandleStandardArgs.cmake:378 (_FPHSA_FAILURE_MESSAGE)
/usr/share/cmake/geographiclib/FindGeographicLib.cmake:28 (find_package_handle_standard_args)
CMakeLists.txt:4 (find_package)
-- Configuring incomplete, errors occurred!现在我不知道该怎么做了。我可以确认安装了/usr/lib/x86_64-linux-gnu/libGeographic.a和/usr/lib/x86_64-linux-gnu/libGeographic.so的libgeographic包。
回答 3
Stack Overflow用户
发布于 2018-01-30 14:45:07
我编写了自己的FindGeographicLib.cmake来找到它，并将它安装在项目的一个子文件夹中。然后，我将${CMAKE_MODULES_PATH}指向项目的CMakeLists.txt中的这个文件夹：
set(CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/modules)首先，我添加了由libgeographic部署的那个：
cp /usr/share/cmake/geographiclib/FindGeographicLib.cmake ./modules/FindGeographicLib.cmake不幸的是，这是不可能的。这个库是在/usr/lib/x86_64-linux-gnu/libGeographic.so找到的，脚本处理的不是很好。它试图(但失败)在/usr/lib/include中找到标头。我对脚本做了一些调整，以检查这个例子，现在我有了一个可行的解决方案。
新的FindGeographicLib.cmake如下所示。我的改动是在适当的行的右边加上注释。
# Look for GeographicLib
#
# Sets
# GeographicLib_FOUND = TRUE
# GeographicLib_INCLUDE_DIRS = /usr/local/include
# GeographicLib_LIBRARIES = /usr/local/lib/libGeographic.so
# GeographicLib_LIBRARY_DIRS = /usr/local/lib
find_library (GeographicLib_LIBRARIES Geographic
PATHS "${CMAKE_INSTALL_PREFIX}/../GeographicLib/lib")
if (GeographicLib_LIBRARIES)
get_filename_component (GeographicLib_LIBRARY_DIRS
"${GeographicLib_LIBRARIES}" PATH)
get_filename_component (_ROOT_DIR "${GeographicLib_LIBRARY_DIRS}" PATH)
set (GeographicLib_INCLUDE_DIRS "${_ROOT_DIR}/include")
set (GeographicLib_BINARY_DIRS "${_ROOT_DIR}/bin")
if (NOT EXISTS "${GeographicLib_INCLUDE_DIRS}/GeographicLib/Config.h")
get_filename_component(_ROOT_DIR "${_ROOT_DIR}" PATH) # Added to script
set (GeographicLib_INCLUDE_DIRS "${_ROOT_DIR}/include") # Added to script
set (GeographicLib_BINARY_DIRS "${_ROOT_DIR}/bin") # Added to script
if (NOT EXISTS "${GeographicLib_INCLUDE_DIRS}/GeographicLib/Config.h") # Added to script
unset (GeographicLib_INCLUDE_DIRS)
unset (GeographicLib_LIBRARIES)
unset (GeographicLib_LIBRARY_DIRS)
unset (GeographicLib_BINARY_DIRS)
endif() # Added to script
endif ()
unset (_ROOT_DIR) # Moved below if() statements
endif ()
include (FindPackageHandleStandardArgs)
find_package_handle_standard_args (GeographicLib DEFAULT_MSG
GeographicLib_LIBRARY_DIRS GeographicLib_LIBRARIES GeographicLib_INCLUDE_DIRS)
mark_as_advanced (GeographicLib_LIBRARY_DIRS GeographicLib_LIBRARIES
GeographicLib_INCLUDE_DIRS)Stack Overflow用户
发布于 2019-02-09 19:38:15
根据这个错误报告，
地理信息库-dev安装程序将FindGeographicLib.cmake文件放入:FindGeographicLib.cmake 正确的位置是:/usr/share/cmak-3.5/Modules
实际上，它取决于当前安装的cmake版本。在Ubuntu 18.04，是3-10。
所以你可以这样解决这个问题：
sudo ln -s /usr/share/cmake/geographiclib/FindGeographicLib.cmake /usr/share/cmake-3.10/Modules/Stack Overflow用户
发布于 2022-08-08 14:58:08
下游项目的解决方案:添加
set(CMAKE_MODULE_PATH "${CMAKE_MODULE_PATH};/usr/share/cmake/geographiclib")就在find_package(GeographicLib REQUIRED)之前。这修复了损坏的Debian/Ubuntu安装程序。其他发行版可能会把文件放到别处，尽管.
https://stackoverflow.com/questions/48169653
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