[LyX/master] improve mingw runtime detection

[Peter Kümmel]

commit 2ce5ca7fcc4ada20e3739aba2fa2c62ce4eb6208
Author: Peter Kümmel <kuem...@lyx.org>
Date:   Wed Dec 9 13:21:31 2015 +0100

    improve mingw runtime detection

diff --git a/development/cmake/LyxPackaging.cmake 
b/development/cmake/LyxPackaging.cmake
index 6983ccc..7520ae0 100644
--- a/development/cmake/LyxPackaging.cmake
+++ b/development/cmake/LyxPackaging.cmake
@@ -41,32 +41,12 @@ elseif(WIN32)
     set(CPACK_GENERATOR ZIP)
     set(CPACK_BINARY_ZIP 1)
     if(MINGW)
-        get_filename_component(MINGW_BIN_PATH ${CMAKE_CXX_COMPILER} PATH)
-        if(LYX_XMINGW)
-            if(LYX_USE_QT MATCHES "QT4")
-                get_filename_component(mingw_name ${LYX_XMINGW} NAME)
-                set(MINGW_BIN_PATH ${MINGW_BIN_PATH}/../${mingw_name}/lib)
-                set(MINGW_LIB_PATH ${MINGW_BIN_PATH})
-            else()
-                set(MINGW_BIN_PATH /usr/lib/gcc/${LYX_XMINGW}/${GCC_VERSION})
-                set(MINGW_LIB_PATH /usr/${LYX_XMINGW}/lib)
-            endif()
-        endif()
-        if(EXISTS ${MINGW_BIN_PATH}/libgcc_s_sjlj-1.dll)
-            list(APPEND runtime ${MINGW_BIN_PATH}/libgcc_s_sjlj-1.dll)
-        elseif(EXISTS ${MINGW_BIN_PATH}/libgcc_s_seh-1.dll)
-            list(APPEND runtime ${MINGW_BIN_PATH}/libgcc_s_seh-1.dll)
-        elseif(EXISTS ${MINGW_BIN_PATH}/libgcc_s_dw2-1.dll)
-            list(APPEND runtime ${MINGW_BIN_PATH}/libgcc_s_dw2-1.dll)
-        endif()
-        if(EXISTS ${MINGW_BIN_PATH}/libstdc++-6.dll)
-            list(APPEND runtime ${MINGW_BIN_PATH}/libstdc++-6.dll)
-        endif()
-        if(EXISTS ${MINGW_LIB_PATH}/libwinpthread-1.dll)
-            list(APPEND runtime ${MINGW_LIB_PATH}/libwinpthread-1.dll)
-        endif()
+        execute_process(COMMAND ${CMAKE_CXX_COMPILER} -print-libgcc-file-name 
OUTPUT_VARIABLE GCC_LIBGCC OUTPUT_STRIP_TRAILING_WHITESPACE)
+        get_filename_component(MINGW_RUNTIME_PATH ${GCC_LIBGCC} PATH)        
+        file(GLOB GCC_RUNTIME ${MINGW_RUNTIME_PATH}/*.dll)
+        list(APPEND runtime ${GCC_RUNTIME} 
/usr/${LYX_XMINGW}/lib/libwinpthread-1.dll)
         if(NOT runtime)
-            message(FATAL_ERROR "No mingw runtime found in ${MINGW_BIN_PATH}")
+            message(FATAL_ERROR "No mingw runtime found in 
${MINGW_RUNTIME_PATH}")
         endif()
 
         if(LYX_USE_QT MATCHES "QT5")