[cmake] Fix building on MinGW-w64

export/cmake/CMakeLists.txt.export

@@ -260,15 +260,19 @@ endif()
 if (LIBINT2_BUILD_SHARED_AND_STATIC_LIBS)
   add_library(libint2 SHARED $<TARGET_OBJECTS:libint2_obj>)
   set_target_properties(libint2 PROPERTIES LIBRARY_OUTPUT_NAME int2 VERSION ${LIBINT_VERSION} SOVERSION 2)
-  if(MSVC)
+  if(WIN32)
     target_compile_definitions(libint2 PUBLIC _USE_MATH_DEFINES)
-    target_compile_options(libint2 PUBLIC "/EHsc")
+    if(MSVC)
+      target_compile_options(libint2 PUBLIC "/EHsc")
+    endif()
   endif()
   add_library(libint2-static STATIC $<TARGET_OBJECTS:libint2_obj>)
   set_target_properties(libint2-static PROPERTIES ARCHIVE_OUTPUT_NAME int2)
-  if(MSVC)
+  if(WIN32)
     target_compile_definitions(libint2-static PUBLIC _USE_MATH_DEFINES)
-    target_compile_options(libint2-static PUBLIC "/EHsc")
+    if(MSVC)
+      target_compile_options(libint2-static PUBLIC "/EHsc")
+    endif()
   endif()
   target_include_directories(libint2-static INTERFACE
         $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/include> $<BUILD_INTERFACE:${PROJECT_BINARY_DIR}/include>
@@ -281,17 +285,17 @@ if (LIBINT2_BUILD_SHARED_AND_STATIC_LIBS)
   # Add libraries to the list of installed components
   install(TARGETS libint2-static EXPORT libint2
         COMPONENT libint2
+        RUNTIME DESTINATION "${LIBINT2_INSTALL_BINDIR}"
         LIBRARY DESTINATION "${LIBINT2_INSTALL_LIBDIR}"
         ARCHIVE DESTINATION "${LIBINT2_INSTALL_LIBDIR}"
         # includes are installed by the include/CMakeLists.txt.include.export
         # INCLUDES DESTINATION "${LIBINT2_INSTALL_INCLUDEDIR}"
        )
 else()
   add_library(libint2 $<TARGET_OBJECTS:libint2_obj>)
+  set_target_properties(libint2 PROPERTIES OUTPUT_NAME int2)
   if (BUILD_SHARED_LIBS)
-    set_target_properties(libint2 PROPERTIES LIBRARY_OUTPUT_NAME int2 VERSION ${LIBINT_VERSION} SOVERSION 2)
-  else(BUILD_SHARED_LIBS)
-    set_target_properties(libint2 PROPERTIES ARCHIVE_OUTPUT_NAME int2)
+    set_target_properties(libint2 PROPERTIES VERSION ${LIBINT_VERSION} SOVERSION 2)
   endif(BUILD_SHARED_LIBS)
 endif()
 # In any case, there will exist a target named "int2": diminish code length by
@@ -309,6 +313,7 @@ add_library(Libint2::int2 ALIAS libint2)
 # Add libraries to the list of installed components
 install(TARGETS libint2 EXPORT libint2
     COMPONENT libint2
+    RUNTIME DESTINATION "${LIBINT2_INSTALL_BINDIR}"
     LIBRARY DESTINATION "${LIBINT2_INSTALL_LIBDIR}"
     ARCHIVE DESTINATION "${LIBINT2_INSTALL_LIBDIR}"
     # includes are installed by the include/CMakeLists.txt.include.export
@@ -346,13 +351,18 @@ if (LIBINT_HAS_CXX_API)
   if (LIBINT_HAS_SYSTEM_BOOST_PREPROCESSOR_VARIADICS)
       target_link_libraries(libint2_cxx INTERFACE Boost::headers)
   endif(LIBINT_HAS_SYSTEM_BOOST_PREPROCESSOR_VARIADICS)
-    if(MSVC)
-        # MSVC does not include <cmath> constants, unless _USE_MATH_DEFINES is defined.
+    if(WIN32)
+      # Windows does not include <cmath> constants, unless _USE_MATH_DEFINES is defined.
+      target_compile_definitions(
+        libint2_cxx
+        INTERFACE
+          _USE_MATH_DEFINES
+      )
+      if(MSVC)
         # _CRT_* to squash some getenv, strdup, strncpy, ctime, fopen warnings
         target_compile_definitions(
           libint2_cxx
           INTERFACE
-            _USE_MATH_DEFINES
             _CRT_NONSTDC_NO_DEPRECATE
             _CRT_NONSTDC_NO_WARNINGS
             _CRT_SECURE_NO_WARNINGS
@@ -363,6 +373,7 @@ if (LIBINT_HAS_CXX_API)
           INTERFACE
             "/EHsc"
           )
+      endif()
     endif()
   get_filename_component(DATADIR_ABSOLUTE "${CMAKE_INSTALL_PREFIX}/${LIBINT2_INSTALL_DATADIR}" ABSOLUTE)
   target_compile_definitions(libint2_cxx INTERFACE
@@ -383,6 +394,7 @@ if (LIBINT_HAS_CXX_API)
   # Add library to the list of installed components
   install(TARGETS libint2_cxx EXPORT libint2
           COMPONENT cxx
+          RUNTIME DESTINATION "${LIBINT2_INSTALL_BINDIR}"
           LIBRARY DESTINATION "${LIBINT2_INSTALL_LIBDIR}"
           ARCHIVE DESTINATION "${LIBINT2_INSTALL_LIBDIR}"
           # includes are installed by the include/CMakeLists.txt.include.export
@@ -400,10 +412,12 @@ add_custom_target_subproject(libint2 check USES_TERMINAL COMMAND ${CMAKE_CTEST_C
 add_executable(eritest-libint2 EXCLUDE_FROM_ALL tests/eri/test.cc)
 target_link_libraries(eritest-libint2 ${int2_library})
 target_include_directories(eritest-libint2 PRIVATE ${PROJECT_SOURCE_DIR}/tests/eri)
-if(MSVC)
-    # TODO on future target pass, def should be added to the L2 target, not added to test
-    target_compile_definitions(eritest-libint2 PUBLIC _USE_MATH_DEFINES)
+if(WIN32)
+  # TODO on future target pass, def should be added to the L2 target, not added to test
+  target_compile_definitions(eritest-libint2 PUBLIC _USE_MATH_DEFINES)
+  if(MSVC)
     target_compile_options(eritest-libint2 PUBLIC "/EHsc")
+  endif()
 endif()
 
 add_test(libint2/eritest/build "${CMAKE_COMMAND}" --build ${CMAKE_BINARY_DIR} --target eritest-libint2)
@@ -514,8 +528,8 @@ if (ENABLE_FORTRAN)
     # specify the location of modules
     set(CMAKE_Fortran_MODULE_DIRECTORY "${PROJECT_BINARY_DIR}/fortran/modules/")
 
-    # preprocess libint2.h ... this is a guess for UNIX systems only
-    if (UNIX)
+    # preprocess libint2.h ... this is a guess for non-MSVC compilers
+    if (NOT MSVC)
 
         file(MAKE_DIRECTORY ${CMAKE_BINARY_DIR}/fortran)
 
@@ -527,7 +541,7 @@ if (ENABLE_FORTRAN)
                 COMMENT "Generating libint2.h.i"
                 )
     else()
-        message(FATAL_ERROR "Cannot run preprocessor on non-Unix systems, disable Fortran to proceed")
+        message(FATAL_ERROR "Cannot run preprocessor with MSVC compilers, disable Fortran to proceed")
     endif()
 
     # translated Libint_t