CMake links library (.a / .so)
I have the following project file structure:
libs/
└──FreeImage/
├── FreeImage.dll
├── FreeImage.h
├── FreeImage.lib
├── license-fi.txt
├── license-gplv2.txt
└── license-gplv3.txt
main.cpp
CMakeLists.txt
My CMakeLists.txt
:
cmake_minimum_required(VERSION 2.8.4)
project(untitled)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
set(FREEIMAGE_LIBRARY_AND_HEADER_DIRECTORY libs/FreeImage)
find_path(FREEIMAGE_LIBRARY_AND_HEADER_DIRECTORY FreeImage.h)
find_library(FREEIMAGE_LIBRARY_AND_HEADER_DIRECTORY freeimage)
include_directories(${FREEIMAGE_LIBRARY_AND_HEADER_DIRECTORY})
set(SOURCE_FILES main.cpp)
add_executable(main ${SOURCE_FILES})
target_link_libraries(main freeimage)
I followed this one to write mine CMakeLists.txt
, but it doesn't work for me.
Output:
/home/username/main_ssd/soft/linux/portable/clion-140.569.17/bin/cmake/bin/cmake --build /home/username/.clion10/system/cmake/generated/70336599/70336599/Debug --target main -- -j 4
-- Configuring done
-- Generating done
-- Build files have been written to: /home/username/.clion10/system/cmake/generated/70336599/70336599/Debug
Scanning dependencies of target main
[100%] Building CXX object CMakeFiles/main.dir/main.cpp.o
Linking CXX executable main
/usr/bin/ld: cannot find -lfreeimage
collect2: error: ld returned 1 exit status
CMakeFiles/main.dir/build.make:85: recipe for target 'main' failed
make[3]: *** [main] Error 1
CMakeFiles/Makefile2:60: recipe for target 'CMakeFiles/main.dir/all' failed
make[2]: *** [CMakeFiles/main.dir/all] Error 2
CMakeFiles/Makefile2:72: recipe for target 'CMakeFiles/main.dir/rule' failed
make[1]: *** [CMakeFiles/main.dir/rule] Error 2
Makefile:160: recipe for target 'main' failed
make: *** [main] Error 2
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I downloaded the new version of the FreeImage library (from here ) and compiled it according to these instructions:
Compiling FreeImagePlus
-----------------------
FreeImagePlus is a C++ wrapper for FreeImage.
To compile FreeImage as a C++ library, follow these steps :
1) Enter the FreeImage directory
2) Build the distribution :
make -f Makefile.fip
make -f Makefile.fip install
3) Clean all files produced during the build process
make -f Makefile.fip clean
So I have the following library file structure:
libs/FreeImage/
├── FreeImage.h
├── FreeImagePlus.h
├── libfreeimageplus-3.16.0.so
├── libfreeimageplus.a
├── license-fi.txt
├── license-gplv2.txt
└── license-gplv3.txt
And then I changed my CMakeLists.txt like this:
cmake_minimum_required(VERSION 2.8.4)
project(untitled)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
find_path(SIFTGPU_INCLUDE_DIR FreeImage.h)
find_library(SIFTGPU_LIBRARY libfreeimageplus)
include_directories(${SIFTGPU_INCLUDE_DIR})
add_executable(main ${SOURCE_FILES})
target_link_libraries(main freeimageplus)
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set(FREEIMAGE_LIBRARY_AND_HEADER_DIRRECTORY libs/FreeImage)
Variable is FREEIMAGE_LIBRARY_AND_HEADER_DIRRECTORY
set tolibs/FreeImage
find_path(FREEIMAGE_LIBRARY_AND_HEADER_DIRRECTORY FreeImage.h)
The variable is FREEIMAGE_LIBRARY_AND_HEADER_DIRRECTORY
set to the directory containing the named file FreeImage.h
. No command hints, due to lack of additional PATHS or HINTS arguments
find_library(FREEIMAGE_LIBRARY_AND_HEADER_DIRRECTORY freeimage)
The variable is FREEIMAGE_LIBRARY_AND_HEADER_DIRRECTORY
set to the full path to the library FreeImage
(if found). No command hints, due to lack of additional PATHS or HINTS arguments
include_directories(${FREEIMAGE_LIBRARY_AND_HEADER_DIRRECTORY})
The variable FREEIMAGE_LIBRARY_AND_HEADER_DIRRECTORY
contains the full path to the library FreeImage
(if found).
target_link_libraries(main freeimage)
There is no named target in CMakeLists.txt file FreeImage
and therefore interpreted as what you want to link-lfreeimage
Question: Why are you trying to use "dll" in Linux?
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