Unless I'm mistaken, it says that the *CONVENTION* is to call
include_directories(${<PACKAGE-NAME>_INCLUDE_DIRS}) manually, not that
it is done automatically. To get that kind of automatic include
directory adding you need to have an import or interface target with
INTERFACE_INCLUDE_DIRECTORIES defined by the find module, then link with
that. Take a look at topics related to Interface Libraries [1] and
writing modern find modules [2]
[1]
http://www.cmake.org/cmake/help/v3.0/manual/cmake-buildsystem.7.html#interface-libraries
[2]
http://www.cmake.org/cmake/help/v3.0/manual/cmake-developer.7.html#find-modules
On 7/18/2014 7:31 PM, Michael Darling wrote:
http://www.cmake.org/Wiki/CMake:How_To_Find_Libraries#How_package_finding_works
seems to indicate if <PACKAGE-NAME>_FOUND is found, the
<PACKAGE-NAME>_INCLUDE_DIRS is passed to the include_directories()
command, and <PACKAGE-NAME>_LIBRARIES is passed to target_link_libraries()
Why is the reduced-case code below calling g++ without including
"-I~/codeTestPackages/lib", causing a "app/app.cpp:1:17: fatal error:
lib.h: No such file or directory" ?
I'm on CMake v3.0.0. Also tried CMake v3.0.20140718-g36a81 (git source.)
All the source is below, and attached as a .tar.gz.
*### CMakeLists.txt ###*
cmake_minimum_required(VERSION 3.0)
project(codeTestPackages)
set(CMAKE_VERBOSE_MAKEFILE on)
set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} ~/codeTestPackages/findModules)
add_subdirectory(lib)
add_subdirectory(app)
*### findModules/Findlib.cmake ###*
IF(NOT lib_FOUND)
set(lib_FOUND "yes")
message("lib_FOUND is ${lib_FOUND}")
set(lib_INCLUDE_DIRS ~/codeTestPackages/lib)
set(lib_LIBRARIES lib)
ENDIF(NOT lib_FOUND)
*### lib/CMakeListst.txt ###*
include_directories(~/codeTestPackages/lib)
add_library(lib lib.cpp)
*### lib/lib.h ###*
#ifndef __LIB__
#define __LIB__
namespace LIB {
unsigned long libFunc(unsigned long inValue);
}
#endif
*### lib/lib.cpp ###*
#include <lib.h>
namespace LIB {
unsigned long libFunc(unsigned long inValue) {
return inValue+1;
}
}
*### app/CMakeLists.txt ###*
find_package(lib REQUIRED)
add_executable(app app.cpp)
*### app/app.cpp ###*
#include <lib.h>
using namespace LIB;
int main() {
unsigned long x = 1;
unsigned long y = libFunc(x);
}
--
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