Compile Poco with MinGW on Windows

Question

I need to compile poco with MinGW so I can use it in Qt Creator but cannot figure out how to, I've managed to compile poco in Visual Studio but I cannot use those libraries in Qt Creator.

Answer 1

With this enviroment:

• MinGW (GCC 4.7.0) + MSYS
• Poco 1.4.6 (downloaded at 5 febrery 2013)

This is how I configure and compile Poco for MinGW and Windows 7:

1. Extract Poco into a folder of your choice. C:/ for this example.

2. Apply the next path to avoid copysign error.(From https://github.com/pocoproject/poco/issues/57).

   In the file C:\poco-1.4.6\Foundation\include\Poco\FPEnvironment_DUMMY.h

   Delete the string std:: in this method:

   inline float FPEnvironmentImpl::copySignImpl(float target, float source)
   {
   #if defined(__APPLE__) || defined(POCO_ANDROID)
       return copysignf(target, source);
   #else
       return /*std::*/copysignf(target, source);
   #endif
   }
   

   And here too:

   inline double FPEnvironmentImpl::copySignImpl(double target, double source)
   {
   #if defined(__APPLE__) || defined(POCO_ANDROID)
       return copysign(target, source);
   #else
       return /*std::*/copysign(target, source);
   #endif
   }
   

3. Modify MinGW configuration at C:\poco-1.4.6\build\config\MinGW. (From http://cidebycide.blogspot.com.es/2012/06/building-poco-c-witn-mingw.html)

   You should delete the -mno-cygwin string in line:

   SHLIB   = $(CXX) -shared -mno-cygwin -o $@ -Wl,--out-implib=$(dir $@)$(subst cyg,lib,$(basename $(notdir $@))).a
   

   and

   SYSFLAGS = -mno-cygwin -D_WIN32 -DMINGW32 -DWINVER=0x500 -DPOCO_NO_FPENVIRONMENT -DPCRE_STATIC -DPOCO_THREAD_STACK_SIZE -DFoundation_Config_INCLUDED -I/usr/local/include -I/usr/include
   

   If you don't need to use cryptography and SSL, you should remove the options -lssl, and -lcrypto at SYSLIBS line.

4. Compile Poco without demos, SSL, cryptography and ODBC support:

   $ ./configure --omit=NetSSL_OpenSSL,Crypto,Data/ODBC,Data/MySQL --prefix=./_INSTALL
   $ make clean
   $ make -j4 -nodemos
   $ make install
   

Good luck!