I'm trying to compile a small program written in c with additional libraries zlib and libpng for an arm processor using using gcc-linaro-arm-linux.
In some .c file:
#include <bzlib.h>
If I compile with an ordinary gcc, everything is working fine, but with a gcc-linaro-arm-linux compiler it could not find libraries:
cmake:
$cmake -D CMAKE_C_COMPILER="${HOME}/opt/gcc-linaro-arm-linux-gnueabihf-4.8-2014.03_linux/bin/arm-linux-gnueabihf-gcc" -D CMAKE_CXX_COMPILER="${HOME}/opt/gcc-linaro-arm-linux-gnueabihf-4.8-2014.03_linux/bin/arm-linux-gnueabihf-g++" CMakeLists.txt
-- The C compiler identification is GNU 4.8.3
-- The CXX compiler identification is GNU 4.8.3
-- Check for working C compiler: /home/alex/opt/gcc-linaro-arm-linux-gnueabihf-4.8-2014.03_linux/bin/arm-linux-gnueabihf-gcc
-- Check for working C compiler: /home/alex/opt/gcc-linaro-arm-linux-gnueabihf-4.8-2014.03_linux/bin/arm-linux-gnueabihf-gcc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working CXX compiler: /home/alex/opt/gcc-linaro-arm-linux-gnueabihf-4.8-2014.03_linux/bin/arm-linux-gnueabihf-g++
-- Check for working CXX compiler: /home/alex/opt/gcc-linaro-arm-linux-gnueabihf-4.8-2014.03_linux/bin/arm-linux-gnueabihf-g++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Could NOT find ZLIB (missing: ZLIB_LIBRARY) (found version "1.2.8")
CMake Error at /usr/share/cmake-2.8/Modules/FindPackageHandleStandardArgs.cmake:108 (message):
Could NOT find PNG (missing: PNG_LIBRARY PNG_PNG_INCLUDE_DIR)
Call Stack (most recent call first):
/usr/share/cmake-2.8/Modules/FindPackageHandleStandardArgs.cmake:315 (_FPHSA_FAILURE_MESSAGE)
/usr/share/cmake-2.8/Modules/FindPNG.cmake:105 (find_package_handle_standard_args)
src/CMakeLists.txt:3 (find_package)
You need to tell CMake where to find your target sysroot. Check out CMAKE_FIND_ROOT_PATH.
Related
I made a test CMakeLists.txt. I set system name and version before reading variables (although I didn't set the compiler):
cmake_minimum_required(VERSION 3.10)
project(test)
include_directories(.)
set(CMAKE_SYSTEM_NAME Windows)
set(CMAKE_SYSTEM_VERSION 10.0.10240.0)
add_executable(test test.c)
target_link_libraries(test)
message("cmake system name = ${CMAKE_SYSTEM_NAME}")
message("cmake host name = ${CMAKE_HOST_SYSTEM_NAME}")
message("cmake system version = ${CMAKE_SYSTEM_VERSION}")
message("unix = ${UNIX}")
message("win32 = ${WIN32}")
Here is the output from "cmake ." on the terminal:
-- The C compiler identification is GNU 9.4.0
-- The CXX compiler identification is GNU 9.4.0
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /usr/bin/cc - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/c++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
cmake system name = Windows
cmake host name = Linux
cmake system version = 10.0.10240.0
unix = 1
win32 =
-- Configuring done
-- Generating done
-- Build files have been written to: /home/francisco/Documents
The CMake documentation says UNIX and WIN32 are set to the target OS. Here I set the target OS and yet they remain set to the host OS. Why?
You're not supposed to write CMAKE_SYSTEM_NAME after the first project() command is encountered by CMake. At the first project command the choices of compiler and target system are made and you cannot change the effects of this later. As you have seen you can overwrite the value of CMAKE_SYSTEM_NAME, but the only effect of doing this are that you and any external cmake logic that may be invoked (e.g. scripts executed when using find_package) see a value that is wrong (i.e. not matching the choice of compiler).
For setting this kind of information your CMakeLists.txt files are the wrong place. This kind of info belongs into a toolchain file alongside your choice of compiler that actually produces binaries for the target platform:
toolchain-windows.cmake
set(CMAKE_SYSTEM_NAME Windows)
set(CMAKE_SYSTEM_VERSION 10.0.10240.0)
set(CMAKE_C_COMPILER <command/absolute path to executable to use as C compiler goes here>)
set(CMAKE_CXX_COMPILER <command/absolute path to executable to use as C++ compiler goes here>)
...
Configure the project using something like
cmake --toolchain path/to/toolchain-windows.cmake -S path/to/source -B path/to/build/dir
Note: The default compiler on your linux almost certainly won't be able cross compile for windows targets.
I's m trying to compile gtest and gmock on windows10 with MinGW and Cmake;
Tools：
cmake --version
cmake version 3.21.1
gcc -v
gcc version 8.1.0
mingw32-make.exe -v
GNU Make 4.2.1
Built for x86_64-w64-mingw32
Build command as followed:
(base) PS D:\WorkSpace\Codes\GTest_GMock\googletest-master\build> cmake .. -G "MinGW Makefiles" -DCMAKE_CXX_FLAGS=-std=gnu++11
-- The C compiler identification is GNU 8.1.0
-- The CXX compiler identification is GNU 8.1.0
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: D:/Program Files/mingw-w64/x86_64-8.1.0-win32-seh-rt_v6-rev0/mingw64/bin/gcc.exe - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: D:/Program Files/mingw-w64/x86_64-8.1.0-win32-seh-rt_v6-rev0/mingw64/bin/g++.exe - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Found Python: D:/ProgramData/Miniconda3/python.exe (found version "3.9.5") found components: Interpreter
-- Configuring done
-- Generating done
-- Build files have been written to: D:/WorkSpace/Codes/GTest_GMock/googletest-master/build
(base) PS D:\WorkSpace\Codes\GTest_GMock\googletest-master\build> mingw32-make.exe
[ 12%] Building CXX object googletest/CMakeFiles/gtest.dir/src/gtest-all.cc.obj
系统找不到指定的路径。(cannot find path)
mingw32-make[2]: *** [googletest\CMakeFiles\gtest.dir\build.make:76: googletest/CMakeFiles/gtest.dir/src/gtest-all.cc.obj] Error 1
mingw32-make[2]: *** Deleting file 'googletest/CMakeFiles/gtest.dir/src/gtest-all.cc.obj'
mingw32-make[1]: *** [CMakeFiles\Makefile2:171: googletest/CMakeFiles/gtest.dir/all] Error 2
mingw32-make: *** [Makefile:145: all] Error 2
(base) PS D:\WorkSpace\Codes\GTest_GMock\googletest-master\build>
I am a beginner in programming with C and I get this error code if i start a project on CLion:
C:\Program Files\JetBrains\CLion 2017.2.2\bin\cmake\bin\cmake.exe" -DCMAKE_BUILD_TYPE=Debug -G "CodeBlocks - MinGW Makefiles" C:\Users\danie\CLionProjects\untitled2
-- The C compiler identification is GNU 5.3.0
-- The CXX compiler identification is unknown
-- Check for working C compiler: C:/MinGW/bin/gcc.exe
-- Check for working C compiler: C:/MinGW/bin/gcc.exe -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
CMake Error at CMakeLists.txt:2 (project):
The CMAKE_CXX_COMPILER:
g++.exe
is not a full path and was not found in the PATH.
Tell CMake where to find the compiler by setting either the environment
variable "CXX" or the CMake cache entry CMAKE_CXX_COMPILER to the full path
to the compiler, or to the compiler name if it is in the PATH.
-- Configuring incomplete, errors occurred!
See also "C:/Users/danie/CLionProjects/untitled2/cmake-build-debug/CMakeFiles/CMakeOutput.log".
See also "C:/Users/danie/CLionProjects/untitled2/cmake-build-debug/CMakeFiles/CMakeError.log".
[Finished]
What can I do to get it working?
Thank you for your help.
By default, CMake expects that project needs support for both C and C++. If your project needs only C, specify that in project() call:
project(<project-name> C)
I try write my module for tarantool:
https://github.com/agent-0007/mrasender
When i try compile it, i get error message:
-- The C compiler identification is GNU 4.4.7
-- The CXX compiler identification is GNU 4.4.7
-- 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
-- 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
-- Found TARANTOOL: /usr/include (found version "1.6.8-611-g944d005")
-- Tarantool LUADIR is share/tarantool
-- Tarantool LIBDIR is lib64/tarantool
CMake Error at /usr/share/cmake/Modules/FindPackageHandleStandardArgs.cmake:108 (message):
Could NOT find MsgPuck (missing: MSGPUCK_INCLUDE_DIR MSGPUCK_LIBRARY)
Call Stack (most recent call first):
/usr/share/cmake/Modules/FindPackageHandleStandardArgs.cmake:315 (_FPHSA_FAILURE_MESSAGE)
FindMsgPuck.cmake:13 (find_package_handle_standard_args)
CMakeLists.txt:18 (find_package)
What's wrong ?
Fedora 15
cmake version 2.8.4
I am using the following CMakeLists.txt. However the status message doesn't display when I run cmake .
CMAKE_MINIMUM_REQUIRED(VERSION 2.6)
PROJECT(proj2 C)
IF(CMAKE_COMPILER_IS_GNUCXX)
MESSAGE(STATUS "==== GCC detected - Adding compiler flags")
SET(CMAKE_C_FLAGS "-pthread -ggdb -Wextra -Wall")
ENDIF(CMAKE_COMPILER_IS_GNUCXX)
ADD_EXECUTABLE(crypto_app main.c)
TARGET_LINK_LIBRARIES(crypto_app crypt)
All I get is the following:
-- The C compiler identification is GNU
-- Check for working C compiler: /usr/lib64/ccache/gcc
-- Check for working C compiler: /usr/lib64/ccache/gcc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Configuring done
-- Generating done
-- Build files have been written to: /home/projects/proj1/
Many thanks for any suggestions about this.
You're telling cmake that it's a C project, and then checking for a CXX (i.e. C++) compiler. CMAKE_COMPILER_IS_GNUCXX will never be true in this case. That's why.