Further cmake changes for SoundTouchDLL compilation

- enable "-Ofast" compilation flags for cmake build
- adjust compiler flags for the SoundTouchDLL compilation
- add cmake-generated "SoundTouchDLL_EXPORTS" as alias for "DLL_EXPORT"
- hide cmake temporary files in gitignore

Signed-off-by: Olli <oparviai'at'iki.fi>

.gitignore

@@ -49,3 +49,6 @@ source/android-lib/.externalNativeBuild
 
 # CMake build directory
 build*
+CMakeFiles
+CMakeCache.txt
+*.cmake

CMakeLists.txt

@@ -30,7 +30,12 @@ if(SOUNDTOUCH_DLL)
     source/SoundTouchDLL/SoundTouchDLL.cpp
     source/SoundTouchDLL/SoundTouchDLL.rc
   )
+  target_compile_options(SoundTouch PRIVATE -fPIC)
+  set_target_properties(SoundTouchDLL PROPERTIES CXX_VISIBILITY_PRESET hidden)
+  target_compile_options(SoundTouchDLL PRIVATE -Ofast)
+  target_compile_definitions(SoundTouchDLL PRIVATE CMAKE)
   target_include_directories(SoundTouchDLL PUBLIC $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>)
+  target_link_libraries(SoundTouchDLL PRIVATE SoundTouch)
   install(FILES source/SoundTouchDLL/SoundTouchDLL.h DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}/soundtouch")
   install(TARGETS SoundTouchDLL EXPORT SoundTouchTargets)
 endif()
@@ -42,6 +47,7 @@ if(WIN32 AND BUILD_SHARED_LIBS)
   endif()
 endif()
 
+target_compile_options(SoundTouch PRIVATE -Ofast)
 target_compile_definitions(SoundTouch PRIVATE CMAKE)
 
 option(INTEGER_SAMPLES "Use integers instead of floats for samples" OFF)

source/SoundTouchDLL/SoundTouchDLL.h

@@ -48,7 +48,7 @@
 #else
     // GNU version
 
-    #ifdef DLL_EXPORTS
+    #if defined(DLL_EXPORTS) || defined(SoundTouchDLL_EXPORTS)
         // GCC declaration for exporting functions
         #define SOUNDTOUCHDLL_API extern "C" __attribute__((__visibility__("default")))
     #else