build: enhance Emscripten configuration by adding SIMD support in SDL and linker flags (#4)

Author: devMinseok

configure.ac

@@ -24,13 +24,13 @@ AC_ARG_ENABLE(
 
 AS_IF([test "x$enable_emscripten" = "xyes"],
   AC_MSG_NOTICE([auto-detected use of Emscripten])
-  SDL_CFLAGS="-s USE_SDL=2"
+  SDL_CFLAGS="-s USE_SDL=2 -msimd128"
   SDL_LIBS="-s USE_SDL=2"
   SDLMIXER_CFLAGS="-s USE_SDL=2 -s USE_SDL_MIXER=2"
   SDLMIXER_LIBS="-s USE_SDL=2 -s USE_SDL_MIXER=2"
   SDLNET_CFLAGS="-s USE_SDL=2 -s USE_SDL_NET=2"
   SDLNET_LIBS="-s USE_SDL=2 -s USE_SDL_NET=2"
-  EM_LDFLAGS="-s ALLOW_MEMORY_GROWTH=1 -s ASYNCIFY=1 -s EXPORTED_RUNTIME_METHODS=[ccall,cwrap,FS,ENV,PATH,ERRNO_CODES] -s FORCE_FILESYSTEM"
+  EM_LDFLAGS="-s ALLOW_MEMORY_GROWTH=1 -s ASYNCIFY=1 -s EXPORTED_RUNTIME_METHODS=[ccall,cwrap,FS,ENV,PATH,ERRNO_CODES] -s FORCE_FILESYSTEM -msimd128"
 )
 
 AC_CONFIG_AUX_DIR(autotools)

src/Makefile.am

@@ -22,7 +22,9 @@ AM_CFLAGS = -I$(top_srcdir)/textscreen            \
             -I$(top_srcdir)/opl                   \
             -I$(top_srcdir)/pcsound               \
             -I$(top_srcdir)/win32                 \
-            @SDLMIXER_CFLAGS@ @SDLNET_CFLAGS@
+            @SDL_CFLAGS@ @SDLMIXER_CFLAGS@ @SDLNET_CFLAGS@
+
+AM_CXXFLAGS = $(AM_CFLAGS)
 
 # Common source files used by absolutely everything: