Dear CMake users and developers,
I've just discovered a build problem that comes from a wrong order of
includes. I would know the correct order, but I am unable to instruct
CMake to use the order I need.
Here is a toy example that I tested with cmake 3.12.0:
----
cmake_minimum_required(VERSION 3.8)
project(MyLib VERSION 1.0.0)
find_package(XXX REQUIRED)
find_package(YYY REQUIRED)
add_library(${PROJECT_NAME} include/MyLib.hh src/MyLib.cc)
target_include_directories(${PROJECT_NAME}
PRIVATE
${CMAKE_CURRENT_SOURCE_DIR}/src
${CMAKE_CURRENT_BINARY_DIR}
PUBLIC
$<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
$<INSTALL_INTERFACE:include>
${XXX_INCLUDE_DIRS} ${YYY_INCLUDE_DIRS})
target_link_libraries(MyLib PUBLIC ${XXX_LIBRARIES} ${YYY_LIBRARIES})
# here come more commands for build flags etc.
enable_testing()
add_executable(MyTest test/src/MyTest.cc test/src/MyTest.hh)
target_include_directories(MyTest PRIVATE
${CMAKE_CURRENT_SOURCE_DIR}/include
${CMAKE_CURRENT_SOURCE_DIR}/test/src
${CMAKE_CURRENT_SOURCE_DIR}/src
${CMAKE_CURRENT_BINARY_DIR}
${GTEST_INCLUDE_DIRS})
target_link_libraries(MyTest PRIVATE MyLib ${GTEST_MAIN_LIBRARIES})
# here come more commands for build flags etc.
----
I configure cmake with -DCMAKE_PREFIX_PATH=${MY_PREFIX_PATH}. When
I build the project, the order of includes for MyLib is fine. But
for MyTest, the following are the first two includes:
-IMyTest_autogen/include
-I${MY_PREFIX_PATH}/include
I think the second include should come much later, only *after*
${CMAKE_CURRENT_SOURCE_DIR}/include, but it comes before. Therefore,
if older headers exists in ${MY_PREFIX_PATH}/include, they will be
used instead of ${CMAKE_CURRENT_SOURCE_DIR}/include!
I found that I can fix the problem by adding 'BEFORE' to all
target_include_directories(). However I'm puzzled why this helps.
Before anything I call target_include_directories(), and before other
includes I have ${CMAKE_CURRENT_SOURCE_DIR}/src,
${CMAKE_CURRENT_BINARY_DIR} and ${CMAKE_CURRENT_SOURCE_DIR}/include.
So what does 'BEFORE' mean in this case? Aren't these the first
includes any ways?
Thanks for any help, and Cheers,
Mario Emmenlauer
--
BioDataAnalysis GmbH, Mario Emmenlauer Tel. Buero: +49-89-74677203
Balanstr. 43 mailto: memmenlauer * biodataanalysis.de
D-81669 München http://www.biodataanalysis.de/
--
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