I downloaded the latest SDL HG from http://www.libsdl.org/ and compiled them using VS2010. And everything is working, but the dynamic linking is inconvenient.
I changed the project properties (in SDL HG) to static compilation, but now in projects (that use these libraries) are a lot of mistakes linker "unresolved external symbol".
How to correctly compile a library?
If you want statically compile SDL in VS2010 you must change type of configuration from dll to lib and set all dependency in "Librarian" (for lib configuration) as in "Linker" (for dll configuration).
E.g. from my SDL_VS2010.vcxproj
<Lib>
<AdditionalDependencies>winmm.lib;imm32.lib;version.lib;%(AdditionalDependencies)</AdditionalDependencies>
</Lib>
<Lib>
<AdditionalLibraryDirectories>$(DXSDK_DIR)\lib\x86</AdditionalLibraryDirectories>
</Lib>
<Lib>
<IgnoreAllDefaultLibraries>true</IgnoreAllDefaultLibraries>
<SubSystem>Windows</SubSystem>
<TargetMachine>MachineX86</TargetMachine>
</Lib>
<ProjectReference>
<LinkLibraryDependencies>false</LinkLibraryDependencies>
</ProjectReference>
Related
My library has minimal, straightforward CMake code with the pertinent lines
add_library(MyLib <sources>)
install(
TARGETS MyLib
LIBRARY DESTINATION ${destination}/lib
RUNTIME DESTINATION ${destination}/lib
COMPONENT Libraries)
install(
FILES mylib.h
DESTINATION ${destination}/include
COMPONENT Headers)
When executed under Windows, the system generates mylib.dll in ...\build\Release, and mylib.lib and mylib.exp (what's that?) in ...\build\lib\Release. It only installs mylib.dll.
My application has minimal, straightforward CMake code to search for my library:
find_path(MyLib_INCLUDE_DIR mylib.h)
find_library(MyLib_LIBRARIES NAMES MyLib)
include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(MyLib DEFAULT_MSG MyLib_LIBRARIES MyLib_INCLUDE_DIR)
Which works under Linux, but under Windows results in
-- Could NOT find MyLib (missing: MyLib_LIBRARIES)
From experimentation I know that this error occurs whenever there is only a .DLL file, and no associated .LIB import library.
Shall I correct MyLib to install mylib.lib? How?
Or is it possible to modify my application so that it is satisfied with mylib.dll only? How?
Research done so far
This is not about static vs dynamic linking (DLL and LIB files - what and why?, cmake link against dll/lib): I want dynamic linking; if a .LIB file is required, it has nothing to do with static linking.
This link cmake : shared library : how to get the .lib name instead of .dll name? may be pertinent, but is not explicit enough. Two other questions CMake generated VS project expecting lib instead of dll, Linking dll/lib to a cmake project seem related, but have no answer.
Command install classifies .lib file for a shared library as ARCHIVE. This is explicitly stated in the documentation:
For DLL platforms (all Windows-based systems including Cygwin), the DLL import library is treated as an ARCHIVE target.
So you need to add ARCHIVE clause to install() for install .lib file as well:
install(
TARGETS MyLib
ARCHIVE DESTINATION ${destination}/lib
LIBRARY DESTINATION ${destination}/lib
RUNTIME DESTINATION ${destination}/bin
COMPONENT Libraries)
Not also, that RUNTIME DESTINATION is usually specified as bin, the same as destination for executables. This helps the executables on Windows to locate the shared libraries (.dll).
Im trying to make CMakeklist.txt file on Windows and I have big problem.
I wrote
cmake_minimum_required(VERSION 3.1.2)
project(c_api)
set(INC_PATH target/release/deps)
set(PROJECT_DLL traffic.dll)
set(PROJECT_LIB traffic.dll.lib)
configure_file(${INC_PATH}/${PROJECT_DLL} ${CMAKE_CURRENT_BINARY_DIR} COPYONLY)
include_directories(${INC_PATH}/include)
add_library(traffic UNKNOWN IMPORTED)
set_property(TARGET traffic PROPERTY IMPORTED_LOCATION ${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_DLL})
set_property(TARGET traffic PROPERTY IMPORTED_IMPLIB ${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_LIB})
file(GLOB SOURCES "c_api/examples/ai_module/*.c")
add_executable(ai_module
${SOURCES}
)
target_link_libraries(ai_module traffic )
I run the project that CMake generate i got
LNK1107 invalid or corrupt file: cannot read at 0x2D8
I thought that the problem is add_library(traffic UNKNOWN IMPORTED) but if I change it to add_library(traffic SHARED IMPORTED) I get
LNK2019 unresolved external symbol _traffic_import_osm referenced in function _main ai_module
so I assume that Visual Studio dont see a library.
I run this code on linux and i only change the .dll format for .so and it works fine.
Im using Visual Studio 15 2017 on CMake
According to the documentation of your first error, it appears you are trying to link to the .dll directly. On Windows, shared libraries require two files. The shared .dll, which includes all the definitions of the functions and classes in the library, and the .lib which (when build with the dll) only contains the declarations. The stub .lib file is used at compile time to tell the linker what to expect from the function.
Do you have both the .lib and the .dll? If you do not have the .lib, you cannot link the .dll to your program.
I solve the problem. CMake make project of 32bits and my .dll is 64bit and now its work
I am trying to use CMake to build a library (which in turn links to other libraries built via CMake). I am having a couple of issues with this process and would love to have some guidance.
For the library, I have a CMakeLists.txt which essentially has
set(SRC srcfile1.cpp srcfile2.cpp)
set(HEADERS srcfile1.h srcfile2.h)
add_library(myLib ${SRC} ${HEADERS})
INSTALL(FILES ${HEADERS} DESTINATION “include/myLib”)
For a “Unix Makefiles” generator, with cmake command
cmake -DCMAKE_INSTALL_PREFIX=. -DCMAKE_BUILD_TYPE=debug -G “Unix Makefiles” ..
I get an appropriate debug library libMyLib.a in build/src. For a release build type, a release build of libMyLib.a is placed in build/src
However, for an Xcode generator, the library is placed in src/Debug. The issues I am facing here are
a. Doing an Archive in Xcode doesn’t seem to have any effect. I don’t see a corresponding Release library being created anywhere
b. I also have a myLibTests target (which uses googles gtest) which is defined in it’s CMakeLists.txt as
set(SRC myTest.cpp)
add_executable(myLibTests ${SRC})
add_dependencies(myLibTests myLib gtest)
set(gTestLib External/src/gTestLib)
target_link_libraries(myLibTests myLib gTestLib)
When the cmake generator is “Unix Makefiles” myLibTests build, links and runs fine. gTestLib is placed in External/src/gtest-build/. But, when it is “Xcode”, it can’t find the gTest libraries. because, the library is placed in External/src/gTestLib/Debug(or Release) as the case may be (and the above path set in CMakeLists.txt is no longer valid). I am not sure how to set it’s path appropriately in the above set statement.
Since, debug/release is controlled in Xcode (and the configure process in CMake is unaware of this), I assume there isn’t a way to separate the release/debug builds of the gTestLib and also have CMake configure Xcode to pick up the appropriate version while building myLib i.e if I do a debug build of myLib it also does a debug build of gTest and links to it (similar for release builds)? Alternatively, is it possible to configure Xcode to place both the Debug and Release builds in the same location (and then hardcode it’s path above)? What would be the best way of configuring this?
Thanks
I'm having difficulties generating the correct boost .lib file to compile with a VS project I've been given. It appears that after performing the complete build installation using 'b2.exe' from VS2010 command prompt I'm only able to generate the boost library files that contain the 'lib' prefix.
When I come to compile my project I'm getting the following error message:
"error LNK1104: cannot open file 'boost_signals-vc90-mt-1_47.lib'"
After going through the lib folder I can see that my boost build has only generated 'libboost_signals-vc90-mt-1_47.lib'
The boost documentation gives the following information about the lib prefix:
lib
Prefix: except on Microsoft Windows, every Boost library name begins with this string. On Windows, only ordinary static libraries use the lib prefix; import libraries and DLLs do not.
So far I've attempted the following build options for the msvc-9.0 toolset:
'build-type=complete'
'link=static,shared'
Any advice on how I may be able to generate the required .lib file would be greatly appreciated.
Many Thanks.
link=static should be used whenever you're linking to static version of boost library.
link=shared - should be used whenever you're linking dynamically to boost. It will add extra dependencies on boost dll's.
You can also use link=static,shared to build both versions - static and dynamic.
Define 'BOOST_ALL_DYN_LINK' in project controls how you link to boost.
If it's defined - it's dynamic linking, if not defined - it's static linking.
I'm working on a DLL project in VS 2010, I want to use boost mutex in some part of my code. but when I compile project to release final DLL, I get this linkage error:
LINK : fatal error LNK1104: cannot open file 'libboost_date_time-vc100-mt-1_49.lib'
I've already compiled boost with this command:
bjam install --toolset=msvc variant=release link=static threading=multi runtime-link=static
& I've a file named libboost_date_time-vc100-mt-s-1_49.lib, when I change configuration type of my project from Dynamic Linked Library (DLL) to Static Library, the project builds successfully, but I need to release only as a DLL file (& my final DLL CAN NOT have any dependency to other external DLLs). I know the problem causes by compilation of boost, but I don't know how should I recompile it
Any guideline?
Check that you link the runtime-library statically (Configuration properties-->C/C++-->Code generation-->Runtime library: Multi-threaded (/MT).
Otherwise, link CRT and boost dynamically. For this purpose build boost like this:
bjam --toolset=msvc variant=release link=shared threading=multi runtime-link=shared
IMO, you built the boost library just fine : you used link=static which means you would like to emit static library (and not a DLL) and since you would like to have standalone deployment , you specified runtime-link=static meaning you link against MS C/C++ run time as static libraries (e.g. the code for printf() will be embedded in your final library and not be referenced to msvcr100.dll)
Please take a look at the picture below, make sure to set the full path of the directory where your boost library resides under Additional Library Dependencies
I fixed my error "Error LNK1104 cannot open file 'libboost_locale-vc142-mt-gd-x32-1_73.lib'" in a DLL project, which I described in this issue on boost' github by installing the boost library using vcpkg.
Install vcpkg. Then write .\vcpkg install boost. You can see how it's done in the video: https://youtu.be/b7SdgK7Y510 . He's not installing the boost library but the process is exactly the same.
This is all for Windows and Visual Studio's toolset, of course.