Arjen Markus writes:
> Jim Dishaw wrote:
>
>>Third, CMake does not provide an option for omitting the default
>>library information when building with MSVC. This is an issue if you
>>want to build a runtime independent library. A runtime independent
>>library is handy because you do not have to build a debug version, a
>>non-debug version, a static version, a multithreaded version, etc. The
>>other option is to have the person using Plplot specify
>>/nodefaultlib:<library> as a linker option. I find that option less
>>desireable than building a runtime independent version of Plplot.
>>
> Hm, that does sound interesting. Is this a problem with MSVC only? How
> does this change with the later versions of MSVC (7, 8, ...)? (I
> usually try to avoid getting involved in these issues, but I do not
> always succeed.)
>
>From what I can tell, almost all versions of MSVC put default library
information into the .obj file. The only exceptions maybe some of the
really old ones. The available default libraries are:
libcmt Multithreaded, static link
msvcrt Multithreaded, dynamic link (e.g. MSVCR80.DLL)
libcmtd Multithreaded, static link, debug
msvcrtd Multithreaded, dynamic link, debug
msvcmrt C Runtime import library for CLR
msvcurt C Runtime import library for pure MSIL code
Older version of MSVC had
libc Singlethreaded, static link
libcd Singlethreaded, static link, debug
The changes that I have so far (they may not be pretty because my grasp
of CMake is weak):
In UserOverride.cmake
message(STATUS "NOTICE: Checking for MSVC on WIN32")
if(WIN32)
if(MSVC)
message(STATUS "NOTICE: MSVC, setting /Zl for library builds")
# Copied from the CMake defaults as of 2.6.0
# W3 = Warning Level 3
# Zm1000 = Max Memory Allocation (% of default)
# Zl = Omit default library information
SET (LIB_C_FLAGS "/DWIN32 /D_WINDOWS /W3 /Zm1000 /Zl")
if(CMAKE_BUILD_TYPE MATCHES "Debug")
# Zi = Enable debugging information
# Ob0 = Disable inline expansion
# Od = Disable optimization
# RTC1 = Enable fast checks
SET (LIB_C_FLAGS_DEBUG "/D_DEBUG /Zi /Ob0 /Od /RTC1")
endif(CMAKE_BUILD_TYPE MATCHES "Debug")
endif(MSVC)
if(TARGET_FORTRAN MATCHES "IVF")
SET(TARGET_LIB_FC_FLAGS "${CMAKE_FC_FLAGS} /libdir:none")
endif(TARGET_FORTRAN MATCHES "IVF")
endif(WIN32)
Next, in the CMakeLists.txt files that are in src, bindings, drivers,
and lib need to have the following added
if(WIN32 AND MSVC)
SET(CMAKE_C_FLAGS "${LIB_C_FLAGS}")
SET(CMAKE_C_FLAGS_DEBUG "${LIB_C_FLAGS_DEBUG}")
endif(WIN32 AND MSVC)
These changes basically create a different set of C flags (I left C++
alone because I was not sure if this is the best way to implement this,
however it could be added with CXX_FLAGS) for files that are destined to
go into the library.
Additional work is needed to get this working for DLL builds--I did not
put the effort in because there may be a better way.
Cheers,
-jd
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