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POCMake - compile with /MT instead of /MD
 

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  1. POCMake - compile with /MT instead of /MD
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    <p>I'm a newbie to cmake (2.8.12.1) and I'm using it on Windows to generate the project files to build cpp-netlib using Visual Studio 2012.</p> <p>By default it compiles with the /MDd compiler switch. I want to change it so that it uses /MTd.</p> <p>I followed the advice given here <a href="https://stackoverflow.com/a/14172871">https://stackoverflow.com/a/14172871</a> but it isn't working for me. </p> <p>Specifically, I added the second line shown below in the if statement to CmakeLists.txt.</p> <pre><code>if (MSVC) set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /bigobj") set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} /MTd") endif() </code></pre> <p>When I open the Visual Studio sln file I can see that the /MDd option is still set. Furthermore, I see the following in CMakeCache.txt:</p> <pre><code>//Flags used by the compiler during debug builds. CMAKE_CXX_FLAGS_DEBUG:STRING=/D_DEBUG /MDd /Zi /Ob0 /Od /RTC1 </code></pre> <p>I've also tried setting the flags from scratch like this:</p> <pre><code>set(CMAKE_CXX_FLAGS_DEBUG "/MTd") </code></pre> <p>but that doesn't work either.</p> <p>If I pass the option via the command line like this:</p> <pre><code>-DCMAKE_CXX_FLAGS_DEBUG="/MTd" </code></pre> <p>the option is successfully set in the Visual Studio projects.</p> <p>Can anyone tell me what I'm doing wrong? </p> <p>I would also appreciate it if someone could enlighten me as to where the values in the cache come from that I don't specify on the command line or aren't in CmakeLists.txt.</p> <p>Adding CMakeList.txt as requested. I've never posted before so apologies if I've not done this right.</p> <pre><code># Original from cpp-netlib.org with my edits cmake_minimum_required(VERSION 2.8) project(CPP-NETLIB) set(Boost_USE_STATIC_LIBS ON) set(Boost_USE_MULTI_THREADED ON) find_package( Boost 1.45.0 REQUIRED unit_test_framework system regex date_time thread filesystem program_options chrono ) find_package( OpenSSL ) find_package( Threads ) set(CMAKE_VERBOSE_MAKEFILE true) if (CMAKE_BUILD_TYPE MATCHES Debug) add_definitions(-DBOOST_NETWORK_DEBUG) endif() if (OPENSSL_FOUND) add_definitions(-DBOOST_NETWORK_ENABLE_HTTPS) include_directories(${OPENSSL_INCLUDE_DIR}) endif() if (${CMAKE_CXX_COMPILER_ID} MATCHES GNU) set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall") endif() if (Boost_FOUND) ################# added ################# add_definitions(-DBOOST_ALL_NO_LIB) ######################################### if (MSVC) add_definitions(-D_SCL_SECURE_NO_WARNINGS) endif(MSVC) if (WIN32) add_definitions(-D_WIN32_WINNT=0x0501) endif(WIN32) include_directories(${Boost_INCLUDE_DIRS}) enable_testing() add_subdirectory(libs/network/src) add_subdirectory(libs/network/test) if (NOT MSVC) add_subdirectory(libs/mime/test) endif(NOT MSVC) add_subdirectory(libs/network/example) endif(Boost_FOUND) if (MSVC) set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /bigobj") ################# added ################# set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} /MTd") ######################################### endif() enable_testing() </code></pre>
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