update emcc build opts, update compile-bc

README.org

@@ -150,18 +150,20 @@ make config=release_sse ex-glfw01 && bin/release/ex-glfw01
 To compile with Emscripten & open in browser: [[http://localhost:8000/glfw.html][http://localhost:8000/glfw.html]]
 
 #+BEGIN_SRC shell
-  # build LLVM bitcode of library (libcthing.bc)
+  # build LLVM bitcode of library (./obj/libcthing.bc)
   ./compile-bc
 
   # compile example for browser & link with lib
-  emcc -Os -DCT_FEATURE_LOG -DNDEBUG \
+  emcc -O2 -DCT_FEATURE_LOG -DCT_NO_EXPORT -DNDEBUG \
        -s 'USE_GLFW=3' \
        -s 'ELIMINATE_DUPLICATE_FUNCTIONS=1' \
+       -s 'NO_EXIT_RUNTIME=1' \
+       --llvm-lto 1 \
        --closure 1 \
        --preload-file assets/suzanne.stl \
        -Isrc \
        -o glfw.html \
-       examples/glfw/*.c libcthing.bc
+       examples/glfw/*.c obj/libcthing.bc
 
   # launch server
   python -m SimpleHTTPServer

compile-bc

@@ -6,7 +6,8 @@ for d in $SRC_DIRS; do for f in `ls $d/*.c`; do SRC="$SRC $f"; done; done;
 
 CFLAGS="-std=c11 -Os -Isrc -DCT_NO_EXPORT"
 EMFLAGS="-s ASM_JS=1 -s ASSERTIONS=0 --js-library src/rt_cthing.js"
-OUT=libcthing.bc
+BUILD_DIR=obj
+OUT=$BUILD_DIR/libcthing.bc
 
 usage()
 {
@@ -48,6 +49,7 @@ echo "cflags: $CFLAGS"
 echo "emflags: $EMFLAGS"
 echo "src: $SRC"
 
+mkdir -p $BUILD_DIR
 time emcc $CFLAGS $EMFLAGS -o $OUT $SRC
 
 ls -la $OUT