Use ccache

.circleci/config.yml

@@ -17,7 +17,7 @@ jobs:
             # Set up the Debian testing repo, and then install g++ from there...
             sudo bash -c "echo \"deb http://ftp.us.debian.org/debian testing main contrib non-free\" >> /etc/apt/sources.list"
             sudo apt-get update
-            sudo apt-get install node-less cmake build-essential clang-format-6.0 flake8 uglifyjs python3-yaml chromium
+            sudo apt-get install node-less cmake build-essential clang-format-6.0 flake8 uglifyjs python3-yaml chromium ccache
             sudo apt-get install -t testing g++-8
             sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-6 60 --slave /usr/bin/g++ g++ /usr/bin/g++-6
             sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-8 80 --slave /usr/bin/g++ g++ /usr/bin/g++-8
@@ -47,7 +47,7 @@ jobs:
 
       - restore_cache:
           keys:
-          - v1-emsdk-{{ checksum "emsdk/Makefile" }}-v4
+          - v1-emsdk-{{ checksum "emsdk/Makefile" }}-v5
 
       - run:
           name: build
@@ -58,6 +58,7 @@ jobs:
       - save_cache:
           paths:
             - ./emsdk/emsdk
+            - $HOME/.ccache
           key: v1-emsdk-{{ checksum "emsdk/Makefile" }}-v4
 
       - run:

.gitignore

@@ -13,6 +13,7 @@ build
 downloads
 host
 installs
+ccache
 
 /root/
 /build/

Makefile

@@ -29,6 +29,7 @@ LDFLAGS=\
   -s WASM=1 \
 	-s SWAPPABLE_ASM_MODULE=1 \
 	-s USE_FREETYPE=1 \
+	-s USE_LIBPNG=1 \
 	-std=c++14 \
   -lstdc++ \
   --memory-init-file 0
@@ -48,6 +49,11 @@ all: build/pyodide.asm.js \
 	build/renderedhtml.css \
   build/test.data \
   build/packages.json
+	if hash ccache &>/dev/null; then \
+		mkdir -p $(PYODIDE_ROOT)/ccache ; \
+    ln -s `which ccache` $(PYODIDE_ROOT)/ccache/emcc ; \
+    ln -s `which ccache` $(PYODIDE_ROOT)/ccache/em++ ; \
+  fi
 
 
 build/pyodide.asm.js: src/main.bc src/jsimport.bc src/jsproxy.bc src/js2python.bc \
@@ -126,7 +132,7 @@ clean:
 
 
 %.bc: %.c $(CPYTHONLIB)
-	$(CC) -o $@ $< $(CFLAGS)
+	$(CC) -o $@ -c $< $(CFLAGS)
 
 
 build/test.data: $(CPYTHONLIB)

Makefile.envs

-export PATH := $(PYODIDE_ROOT)/emsdk/emsdk:$(PYODIDE_ROOT)/emsdk/emsdk/clang/tag-e-1.38.4/build_tag-e1.38.4_64/bin:$(PYODIDE_ROOT)/emsdk/emsdk/node/8.9.1_64bit/bin:$(PYODIDE_ROOT)/emsdk/emsdk/emscripten/tag-1.38.4:$(PYODIDE_ROOT)/emsdk/emsdk/binaryen/tag-1.38.4_64bit_binaryen/bin:$(PATH)
+export PATH := $(PYODIDE_ROOT)/ccache:$(PYODIDE_ROOT)/emsdk/emsdk:$(PYODIDE_ROOT)/emsdk/emsdk/clang/tag-e-1.38.4/build_tag-e1.38.4_64/bin:$(PYODIDE_ROOT)/emsdk/emsdk/node/8.9.1_64bit/bin:$(PYODIDE_ROOT)/emsdk/emsdk/emscripten/tag-1.38.4:$(PYODIDE_ROOT)/emsdk/emsdk/binaryen/tag-1.38.4_64bit_binaryen/bin:$(PATH)
 
 export EMSDK = $(PYODIDE_ROOT)/emsdk/emsdk
 export EM_CONFIG = $(PYODIDE_ROOT)/emsdk/emsdk/.emscripten

cpython/Setup.local

@@ -24,7 +24,7 @@ _posixsubprocess _posixsubprocess.c
 
 binascii binascii.c
 
-zlib zlibmodule.c -IModules/zlib zlib/adler32.c zlib/crc32.c zlib/deflate.c zlib/infback.c zlib/inffast.c zlib/inflate.c zlib/inftrees.c zlib/trees.c zlib/zutil.c zlib/compress.c zlib/uncompr.c zlib/gzclose.c zlib/gzlib.c zlib/gzread.c zlib/gzwrite.c
+zlib zlibmodule.c -IModules/zlib
 
 pyexpat expat/xmlparse.c expat/xmlrole.c expat/xmltok.c pyexpat.c -I$(srcdir)/Modules/expat -DHAVE_EXPAT_CONFIG_H -DUSE_PYEXPAT_CAPI -DXML_POOR_ENTROPY