Remove freetype and png from the main module (#2813)

Makefile.envs

@@ -100,8 +100,7 @@ export MAIN_MODULE_LDFLAGS= $(LDFLAGS_BASE) \
 	-s EXPORT_NAME="'_createPyodideModule'" \
 	-s EXCEPTION_CATCHING_ALLOWED=['we only want to allow exception handling in side modules'] \
 	-s DEMANGLE_SUPPORT=1 \
-	-s USE_FREETYPE=1 \
-	-s USE_LIBPNG=1 \
+	-s USE_ZLIB=1 \
 	-s FORCE_FILESYSTEM=1 \
 	-s TOTAL_MEMORY=20971520 \
 	-s ALLOW_MEMORY_GROWTH=1 \

packages/Pillow/meta.yaml

@@ -10,11 +10,13 @@ source:
     - - src/setup.cfg
       - ./setup.cfg
 build:
+  # RELOCATABLE flag is required because if affects how emscripten build ports.
   cflags: |
+    -s RELOCATABLE=1
     -s USE_ZLIB=1
-    -s USE_LIBJPEG=1
     -s USE_FREETYPE=1
-    -s SIDE_MODULE=1
+    -s USE_LIBPNG=1
+    -s USE_LIBJPEG=1
   ldflags: |
     -ljpeg
 

packages/libwebp/meta.yaml

@@ -9,6 +9,18 @@ source:
 build:
   library: true
   script: |
-    mkdir build && cd build && emcmake cmake -DCMAKE_C_FLAGS="-fPIC" -DCMAKE_INSTALL_PREFIX=${WASM_LIBRARY_DIR} ../
+    mkdir build && cd build && emcmake cmake \
+      -DCMAKE_C_FLAGS="-fPIC" \
+      -DCMAKE_INSTALL_PREFIX=${WASM_LIBRARY_DIR} \
+      -DWEBP_BUILD_CWEBP=OFF \
+      -DWEBP_BUILD_DWEBP=OFF \
+      -DWEBP_BUILD_VWEBP=OFF \
+      -DWEBP_BUILD_GIF2WEBP=OFF \
+      -DWEBP_BUILD_IMG2WEBP=OFF \
+      -DWEBP_BUILD_WEBPINFO=OFF \
+      -DWEBP_BUILD_WEBPINFO=OFF \
+      -DWEBP_BUILD_WEBPMUX=OFF \
+      -DWEBP_BUILD_EXTRAS=OFF \
+      ../
     emmake make -j ${PYODIDE_JOBS:-3}
     emmake make install

packages/matplotlib/meta.yaml

@@ -22,8 +22,13 @@ source:
       - ./mplsetup.cfg
 
 build:
-  cflags: -s USE_FREETYPE=1 -s USE_LIBPNG=1 -s USE_ZLIB=1
-  ldflags: -s USE_FREETYPE=1 -s USE_LIBPNG=1 -s USE_ZLIB=1
+  # RELOCATABLE flag is required because if affects how emscripten build ports.
+  cflags: |
+    -s RELOCATABLE=1
+    -s USE_FREETYPE=1
+    -s USE_LIBPNG=1
+    -s USE_ZLIB=1
+    -fno-lto
   script: export SETUPTOOLS_SCM_PRETEND_VERSION=$PKG_VERSION
   post: |
     cd build/matplotlib-$PKG_VERSION/dist/matplotlib-$PKG_VERSION/

packages/opencv-python/meta.yaml

@@ -25,12 +25,12 @@ requirements:
     - libwebp
     - libtiff
 build:
+  # RELOCATABLE flag is required because if affects how emscripten build ports.
   cxxflags: |
-    -fPIC
+    -s RELOCATABLE=1
     -s USE_ZLIB=1
     -s USE_LIBJPEG=1
     -s USE_LIBPNG=1
-    -s SIDE_MODULE=1
   ldflags: |
     -ljpeg
     -lz

pyodide-build/pyodide_build/pywasmcross.py

@@ -241,8 +241,7 @@ def replay_genargs_handle_dashl(arg: str, used_libs: set[str]) -> str | None:
     if arg == "-lffi":
         return None
 
-    # See https://github.com/emscripten-core/emscripten/issues/8650
-    if arg in ["-lfreetype", "-lz", "-lpng", "-lgfortran"]:
+    if arg == "-lgfortran":
         return None
 
     # WASM link doesn't like libraries being included twice