Fix effcee-example MinGW cross-compile

For MinGW:
- Don't try to use pthreads
- Statically link the C++ runtime

CMakeLists.txt

@@ -25,6 +25,10 @@ else()
   message(STATUS "Configuring Effcee to avoid building samples.")
 endif()
 
+# RE2 needs Pthreads on non-WIN32
+set(CMAKE_THREAD_LIBS_INIT "")
+find_package(Threads)
+
 include(cmake/setup_build.cmake)
 include(cmake/utils.cmake)
 

cmake/utils.cmake

@@ -17,9 +17,6 @@
 function(effcee_default_c_compile_options TARGET)
   if (NOT "${MSVC}")
     target_compile_options(${TARGET} PRIVATE -Wall -Werror)
-    if (UNIX)
-      target_compile_options(${TARGET} PUBLIC -pthread)
-    endif(UNIX)
     if (ENABLE_CODE_COVERAGE)
       # The --coverage option is a synonym for -fprofile-arcs -ftest-coverage
       # when compiling.
@@ -37,7 +34,9 @@ function(effcee_default_c_compile_options TARGET)
           LINK_FLAGS "-static -static-libgcc")
       endif(WIN32)
     endif(NOT EFFCEE_ENABLE_SHARED_CRT)
-    target_link_libraries(${TARGET} PUBLIC ${CMAKE_THREAD_LIBS_INIT})
+    if (UNIX AND NOT MINGW)
+      target_link_libraries(${TARGET} PUBLIC -pthread)
+    endif()
   else()
     # disable warning C4800: 'int' : forcing value to bool 'true' or 'false'
     # (performance warning)

examples/CMakeLists.txt

 add_executable(effcee-example main.cc)
 
 target_link_libraries(effcee-example effcee)
-if(UNIX)
-  target_link_libraries(effcee-example -pthread)
-endif(UNIX)
+if(UNIX AND NOT MINGW)
+  set_target_properties(effcee-example PROPERTIES LINK_FLAGS -pthread)
+endif()
+if (WIN32 AND NOT MSVC)
+  # For MinGW cross-compile, statically link to the C++ runtime
+  set_target_properties(effcee-example PROPERTIES
+	  LINK_FLAGS "-static -static-libgcc -static-libstdc++")
+endif(WIN32 AND NOT MSVC)
+
 
 if(EFFCEE_BUILD_TESTING)
   add_test(NAME effcee-example