Binary directory of executables defined with CMake + Conan - cmake

I am using CMake where I have defined the paths of the output executables:
SET(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${BINARY_DIR})
SET(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${BINARY_DIR})
SET(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${BINARY_DIR})
BINARY_DIR contains value: "/mnt/t/myapp/bin".
The problem comes up with Conan - executable files are not copied into ${BINARY_DIR} directory after using:
INCLUDE(${BUILD_DIR}/conanbuildinfo.cmake)
conan_basic_setup(TARGETS)
Any idea? What am I doing wrong?
#edit
conanfile.txt:
[requires]
Poco/1.10.1#pocoproject/stable
[generators]
cmake

I found the reason.
This macro redefines cmake variables:
macro(conan_output_dirs_setup)
set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/bin)
set(CMAKE_RUNTIME_OUTPUT_DIRECTORY_RELEASE ${CMAKE_RUNTIME_OUTPUT_DIRECTORY})
set(CMAKE_RUNTIME_OUTPUT_DIRECTORY_RELWITHDEBINFO ${CMAKE_RUNTIME_OUTPUT_DIRECTORY})
set(CMAKE_RUNTIME_OUTPUT_DIRECTORY_MINSIZEREL ${CMAKE_RUNTIME_OUTPUT_DIRECTORY})
set(CMAKE_RUNTIME_OUTPUT_DIRECTORY_DEBUG ${CMAKE_RUNTIME_OUTPUT_DIRECTORY})
set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/lib)
set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY_RELEASE ${CMAKE_ARCHIVE_OUTPUT_DIRECTORY})
set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY_RELWITHDEBINFO ${CMAKE_ARCHIVE_OUTPUT_DIRECTORY})
set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY_MINSIZEREL ${CMAKE_ARCHIVE_OUTPUT_DIRECTORY})
set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY_DEBUG ${CMAKE_ARCHIVE_OUTPUT_DIRECTORY})
set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/lib)
set(CMAKE_LIBRARY_OUTPUT_DIRECTORY_RELEASE ${CMAKE_LIBRARY_OUTPUT_DIRECTORY})
set(CMAKE_LIBRARY_OUTPUT_DIRECTORY_RELWITHDEBINFO ${CMAKE_LIBRARY_OUTPUT_DIRECTORY})
set(CMAKE_LIBRARY_OUTPUT_DIRECTORY_MINSIZEREL ${CMAKE_LIBRARY_OUTPUT_DIRECTORY})
set(CMAKE_LIBRARY_OUTPUT_DIRECTORY_DEBUG ${CMAKE_LIBRARY_OUTPUT_DIRECTORY})
endmacro()
To fix that:
conan_basic_setup(TARGETS NO_OUTPUT_DIRS)

Related

how to split 'header', 'src', 'test' dir in cmake?(and donot add cmakelist.txt in each dir)

when building a project stucture like following:
LinearAlgebra
|---HEADER
|-----|---Linear.h
|---SRC
|-----|---Linear.cpp
|---TEST
|-----|---hello_test.cc
here is my CMakeList.txt:
cmake_minimum_required(VERSION 3.10)
project(LinearAlgebra )
set(CMAKE_CXX_STANDARD 11)
include(FetchContent)
FetchContent_Declare(
googletest
URL https://github.com/google/googletest/archive/609281088cfefc76f9d0ce82e1ff6c30cc3591e5.zip
)
# For Windows: Prevent overriding the parent project's compiler/linker settings
set(gtest_force_shared_crt ON CACHE BOOL "" FORCE)
FetchContent_MakeAvailable(googletest)
add_library(LA_HEADER INTERFACE header/Linear.h)
add_library(LA_SRC INTERFACE src/Linear.cpp)
target_include_directories(LA_HEADER INTERFACE "${PROJECT_SOURCE_DIR}/header" "${PROJECT_SOURCE_DIR}/src")
enable_testing()
add_executable(
hello_test
test/hello_test.cc
)
target_link_libraries(
hello_test
gtest_main
LA_HEADER
LA_SRC
)
include(GoogleTest)
gtest_discover_tests(hello_test)
it works fine with cmake -S . -B build, but when it comes to cmake --build build following error occured:
Undefined symbols for architecture x86_64:
"Linear::Linear()", referenced from:
HelloTest_BasicAssertions_Test::TestBody() in hello_test.cc.o
it seems something wrong with my cmake file that didn't tell Linear.h where Linear.cpp located. So how to fix it ?? thanks for your help...
seems i misunderstand add_library, change three lines and it works out:
cmake_minimum_required(VERSION 3.10)
project(LinearAlgebra )
include_directories(header) # include_directories instead of add_library for .h files
add_library(LA_LIB src/Linear.cpp) # use add_library for .cpp files only!!!
set(CMAKE_CXX_STANDARD 11)
include(FetchContent)
FetchContent_Declare(
googletest
URL https://github.com/google/googletest/archive/609281088cfefc76f9d0ce82e1ff6c30cc3591e5.zip
)
# For Windows: Prevent overriding the parent project's compiler/linker settings
set(gtest_force_shared_crt ON CACHE BOOL "" FORCE)
FetchContent_MakeAvailable(googletest)
enable_testing()
add_executable(
hello_test
test/hello_test.cc
)
target_link_libraries(
hello_test
gtest_main
LA_LIB # link LA_LIB only..
)
include(GoogleTest)
gtest_discover_tests(hello_test)
leave it here for anyone have the same requirements.

CMakeLists.txt not in root directory, can't do an automatic build

I have an issue with a repository not having its CMakeLists in the root directory, namely https://github.com/lz4/lz4
The CMakeLists.txt is in the subfolder contrib/cmake_unofficial.
I already checked similar questions on SO (Is it possible to have cmake build file (CMakeLists.txt) not in root in CLion, cmake - CMakeLists.txt is not in root folder (but is included in source)), but they only provide alternatives, and not a solution applicable to my situation.
Heres the cmake module I came up with:
if(ENABLE_LZ4)
message(STATUS "Using LZ4.")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DENABLE_LZ4")
# Enable ExternalProject CMake module
include(ExternalProject)
set(LZ4_SOURCE_DIR ${CMAKE_CURRENT_BINARY_DIR}/lz4)
set(LZ4_BINARY_DIR ${CMAKE_CURRENT_BINARY_DIR}/lib)
# Download and install lz4
ExternalProject_Add(
lz4
GIT_REPOSITORY https://github.com/lz4/lz4.git
GIT_TAG dev
SOURCE_DIR ${LZ4_SOURCE_DIR}
BINARY_DIR ${LZ4_BINARY_DIR}
INSTALL_COMMAND ""
CMAKE_ARGS
${LZ4_SOURCE_DIR}/contrib/cmake_unofficial
-DCMAKE_C_COMPILER=${CMAKE_C_COMPILER}
)
# Get lz4 source and binary directories from CMake project
ExternalProject_Get_Property(lz4 source_dir binary_dir)
# Create a liblz4 target to be used as a dependency by the program
add_library(liblz4 IMPORTED SHARED GLOBAL)
add_dependencies(liblz4 lz4)
include_directories(
${LZ4_SOURCE_DIR}/lib
)
set(LZ4_LIB ${LZ4_BINARY_DIR}/liblz4.so)
else()
message(STATUS "Not using LZ4.")
set(LZ4_LIB "")
endif()
Here the complete error output:
[ 0%] Performing update step for 'lz4'
Current branch dev is up to date.
[ 1%] Performing configure step for 'lz4'
CMake Error: The source directory "/****/build/lz4" does not appear to contain CMakeLists.txt.
Specify --help for usage, or press the help button on the CMake GUI.
CMakeFiles/lz4.dir/build.make:105: recipe for target 'lz4-prefix/src/lz4-stamp/lz4-configure' failed
make[2]: *** [lz4-prefix/src/lz4-stamp/lz4-configure] Error 1
CMakeFiles/Makefile2:72: recipe for target 'CMakeFiles/lz4.dir/all' failed
make[1]: *** [CMakeFiles/lz4.dir/all] Error 2
Makefile:94: recipe for target 'all' failed
make: *** [all] Error 2
I tried adding the path 'contrib/cmake_unofficial' to the CMAKE_ARGS variable (as seen in the module above), but it does not work (seems to be ignored?).
I also tried using PATCH_COMMAND to copy the CMakeLists.txt to the root before the build starts, but the relative paths of the file get messed up.
In other words, i need the cmake command to be called to build the library to be : cmake contrib/cmake_unofficial.
I also tried using CONFIGURE_COMMAND for this, but keep getting a file not found error for some reason (even though the path is correct).
The module has some other issues too, but I'm only interested in the non-root CMakeLists.
Thanks in advance!
ExternalProject separates download and source directories:
DOWNLOAD_DIR - a directory where downloading step is performed
SOURCE_DIR - a directory used as a source one when configuration step is performed
When use git for extract the project, note that git clone is called from the download directory, where it creates new directory with a project sources.
set(LZ4_DOWNLOAD_DIR ${CMAKE_CURRENT_BINARY_DIR}/lz4)
# Set a source dir based on the download one.
set(LZ4_SOURCE_DIR ${LZ4_DOWNLOAD_DIR}/lz4/contrib/cmake_unofficial)
set(LZ4_BINARY_DIR ${CMAKE_CURRENT_BINARY_DIR}/lib)
# Download and install lz4
ExternalProject_Add(
lz4
DOWNLOAD_DIR ${LZ4_DOWNLOAD_DIR} # Set download directory explicitely
GIT_REPOSITORY https://github.com/lz4/lz4.git
GIT_TAG dev
SOURCE_DIR ${LZ4_SOURCE_DIR}
BINARY_DIR ${LZ4_BINARY_DIR}
...
)
Probably not the correct way to do it, but this seems to work for me.
I used the CONFIGURE_COMMAND to call cmake on the correct directory.
Then use BUILD_COMMAND to call make
So essentially, it breaks down to this:
ExternalProject_Add(
lz4
GIT_REPOSITORY https://github.com/lz4/lz4.git
GIT_TAG dev
SOURCE_DIR ${LZ4_SOURCE_DIR}
BINARY_DIR ${LZ4_BINARY_DIR}
CONFIGURE_COMMAND cmake ${LZ4_SOURCE_DIR}/contrib/cmake_unofficial
BUILD_COMMAND make
INSTALL_COMMAND ""
CMAKE_ARGS
-DCMAKE_C_COMPILER=${CMAKE_C_COMPILER}
)

Find directory where target is defined

Is there a way in cmake to find the source directory of the CMakeLists.txt file in which a target was defined?
Somethign like:
if (TARGET Foo)
message("Library Foo was alread built in ${LOCATION_OF_FOOS_CMAKE}")
else()
add_library(Foo ...)
endif()
Edit:
Unfortunately, my cmake scripts have to work on a default ubuntu 14.04 installation. So I'm limited to cmake 2.8
You can use target property SOURCE_DIR (added with CMake 3.7):
get_target_property(FOO_SOURCE_DIR Foo SOURCE_DIR)
For older versions of CMake you can overwrite e.g. add_library() and define your own SOURCE_DIR target property:
function(add_library _target)
_add_library(${_target} ${ARGN})
set_target_properties(${_target} PROPERTIES SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}")
endfunction(add_library)

How to add_subdirectory after a externalproject_add()?

I have to download zlib to use in my project.
I use externlproject_add() to downaload all zlib repository, build and install it.
After it, I want do install a lib that is part of zlib repository: minizip.
How to set this dependency on cmake?
zlib module:
cmake_minimum_required ( VERSION 2.8.7 )
include (ExternalProject)
if(UNIX)
# An external project for zlib
SET (GIT_URL https://github.com/madler/zlib.git)
SET (ZLIB_INSTALL ${CMAKE_CURRENT_BINARY_DIR})
SET (ZLIB_INCLUDE ${CMAKE_BINARY_DIR}/include/zlib)
SET (ZLIB_STATIC ${CMAKE_BINARY_DIR}/lib/libz.a )
SET (MINIZIP_DIR ${CMAKE_CURRENT_BINARY_DIR}/ZLIB/src/ZLIB/contrib/minizip)
ExternalProject_Add(zlib
PREFIX zlib
GIT_REPOSITORY ${GIT_URL}
INSTALL_DIR ${ZLIB_INSTALL}
PATCH_COMMAND ${CMAKE_COMMAND} -E remove <SOURCE_DIR>/zconf.h
BUILD_IN_SOURCE 1
PATCH_COMMAND ""
CONFIGURE_COMMAND <SOURCE_DIR>/configure --prefix=<INSTALL_DIR> --includedir=${ZLIB_INCLUDE}
)
find_package(ZLIB REQUIRED)
if(ZLIB_FOUND)
add_subdirectory (${MINIZIP_DIR})
endif(ZLIB_FOUND)
SET (ZLIB_INCLUDE_DIR ${ZLIB_INSTALL}/include/zlib)
SET (ZLIB_LIBRARY "${ZLIB_INSTALL}")
ADD_LIBRARY (ZLIB_LIB STATIC IMPORTED DEPENDS zlib)
SET_TARGET_PROPERTIES (ZLIB_LIB PROPERTIES IMPORTED_LOCATION "${ZLIB_STATIC}")
endif(UNIX)
With this zlib module I have an error that following directory
/home/lais/Imagens/agent/build/ZLIB/src/ZLIB/contrib/minizip
doesn't exist yet when I run
cmake ..
And it's true. Doesn't exist yet. I should tell cmake it. But I don't know how to do it.
I solved it download a zip file that have minizip.
cmake_minimum_required ( VERSION 2.8.7 )
include (ExternalProject)
project (zlib)
if(UNIX)
# An external project for zlib
SET (URL http://www.winimage.com/zLibDll/unzip101e.zip)
SET (MINIZIP_INSTALL ${CMAKE_CURRENT_BINARY_DIR})
SET (MINIZIP_STATIC ${CMAKE_BINARY_DIR}/lib/minizip.a )
message ("zlib = ${zlib}")
ExternalProject_Add(minizip
DEPENDS zlib
PREFIX minizip
URL ${URL}
INSTALL_DIR ${MINIZIP_INSTALL}
BUILD_IN_SOURCE make
CONFIGURE_COMMAND ""
)
SET (MINIZIP_LIBRARY "${MINIZIP_INSTALL}")
ADD_LIBRARY (MINIZIP_LIB STATIC IMPORTED DEPENDS minizip, zlib)
SET_TARGET_PROPERTIES (MINIZIP_LIB PROPERTIES IMPORTED_LOCATION "${MINIZIP_STATIC}")
endif(UNIX)

Compile sources in `src` directory to binaries in `bin` directory with CMake

My project directory contains a CMakeLists.txt file and src and include directories at its root. src also contains its own CMakeLists.txt, which is linked by the one at the root. Is there a way I can specify to CMake to set a default global build directory so that the syntax in src/CMakeLists.txt is close to the following?
include_directories(include)
add_executable(first main.cpp foo.cpp)
add_executable(second bar.cpp)
I would like this directory tree to be built:
CMakeLists.txt
src/
CMakeLists.txt
main.cpp
foo.cpp
bar.cpp
include/
...
bin/ (or build/)
first
second
You could set CMAKE_RUNTIME_OUTPUT_DIRECTORY:
set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_SOURCE_DIR}/bin)
However, this won't create subdirectories inside bin/ for each different target.
If you want that, you could create a helper function to wrap add_subdirectories:
function(my_add_executable TargetName)
set(Files ${ARGV})
list(REMOVE_AT Files 0)
add_executable(${TargetName} ${Files})
set_target_properties(${TargetName} PROPERTIES
RUNTIME_OUTPUT_DIRECTORY
"${CMAKE_SOURCE_DIR}/bin/${TargetName}")
endfunction()
then simply change your calls to:
my_add_executable(first main.cpp foo.cpp)
my_add_executable(second bar.cpp)
For further details, run
cmake --help-variable "CMAKE_RUNTIME_OUTPUT_DIRECTORY"
cmake --help-property "RUNTIME_OUTPUT_DIRECTORY"
cmake --help-property "RUNTIME_OUTPUT_DIRECTORY_<CONFIG>"