gha: use setup-emsdk (#53)

Use system emsdk when building locally.

Should make builds faster.

.github/workflows/ci.yml

@@ -6,6 +6,10 @@ jobs:
     steps:
     - name: Checkout
       uses: actions/checkout@9bb56186c3b09b4f86b1c65136769dd318469633 # v4.1.2
+    - uses: mymindstorm/setup-emsdk@6ab9eb1bda2574c4ddb79809fc9247783eaf9021 # v14
+      with:
+        version: 3.1.61
+        actions-cache-folder: 'emsdk-cache'
     - uses: actions/setup-node@60edb5dd545a775178f52524783378180af0d1f8 # v4.0.2
       with:
         node-version-file: '.node-version'

Makefile

@@ -1,6 +1,5 @@
 include third_party_versions.mk
 
-EMSDK_DIR=$(PWD)/third_party/emsdk/upstream/emscripten
 INSTALL_DIR=$(PWD)/install
 FALLBACK_INSTALL_DIR=$(INSTALL_DIR)/fallback
 
@@ -47,17 +46,6 @@ release: clean lib typecheck test
 	@which np || (echo "Install np from https://github.com/sindresorhus/np" && false)
 	np minor
 
-third_party/emsdk: third_party_versions.mk
-	mkdir -p third_party/emsdk
-	test -d $@/.git || git clone --depth 1 https://github.com/emscripten-core/emsdk.git $@
-	cd $@ && git fetch origin $(EMSDK_COMMIT) && git checkout $(EMSDK_COMMIT)
-	touch $@
-
-build/emsdk.uptodate: third_party/emsdk | build
-	third_party/emsdk/emsdk install latest
-	third_party/emsdk/emsdk activate latest
-	touch build/emsdk.uptodate
-
 # Compile flags for Leptonica. These turn off support for various image formats to
 # reduce size. We don't need this since the browser includes this functionality.
 LEPTONICA_FLAGS=\
@@ -71,11 +59,11 @@ third_party/leptonica: third_party_versions.mk
 	cd $@ && git fetch origin $(LEPTONICA_COMMIT) && git checkout $(LEPTONICA_COMMIT)
 	touch $@
 
-build/leptonica.uptodate: third_party/leptonica build/emsdk.uptodate
+build/leptonica.uptodate: third_party/leptonica
 	mkdir -p build/leptonica
-	cd build/leptonica && $(EMSDK_DIR)/emcmake cmake -G Ninja ../../third_party/leptonica $(LEPTONICA_FLAGS)
-	cd build/leptonica && $(EMSDK_DIR)/emmake ninja
-	cd build/leptonica && $(EMSDK_DIR)/emmake ninja install
+	cd build/leptonica && emcmake cmake -G Ninja ../../third_party/leptonica $(LEPTONICA_FLAGS)
+	cd build/leptonica && emmake ninja
+	cd build/leptonica && emmake ninja install
 	touch build/leptonica.uptodate
 
 # Additional preprocessor defines for Tesseract.
@@ -126,16 +114,16 @@ third_party/tessdata_fast:
 
 build/tesseract.uptodate: build/leptonica.uptodate third_party/tesseract
 	mkdir -p build/tesseract
-	(cd build/tesseract && $(EMSDK_DIR)/emcmake cmake -G Ninja ../../third_party/tesseract $(TESSERACT_FLAGS))
-	(cd build/tesseract && $(EMSDK_DIR)/emmake ninja)
-	(cd build/tesseract && $(EMSDK_DIR)/emmake ninja install)
+	(cd build/tesseract && emcmake cmake -G Ninja ../../third_party/tesseract $(TESSERACT_FLAGS))
+	(cd build/tesseract && emmake ninja)
+	(cd build/tesseract && emmake ninja install)
 	touch build/tesseract.uptodate
 
 build/tesseract-fallback.uptodate: build/leptonica.uptodate third_party/tesseract
 	mkdir -p build/tesseract-fallback
-	(cd build/tesseract-fallback && $(EMSDK_DIR)/emcmake cmake -G Ninja ../../third_party/tesseract $(TESSERACT_FALLBACK_FLAGS))
-	(cd build/tesseract-fallback && $(EMSDK_DIR)/emmake ninja)
-	(cd build/tesseract-fallback && $(EMSDK_DIR)/emmake ninja install)
+	(cd build/tesseract-fallback && emcmake cmake -G Ninja ../../third_party/tesseract $(TESSERACT_FALLBACK_FLAGS))
+	(cd build/tesseract-fallback && emmake ninja)
+	(cd build/tesseract-fallback && emmake ninja install)
 	touch build/tesseract-fallback.uptodate
 
 # emcc flags. `-Os` minifies the JS wrapper and optimises WASM code size.
@@ -161,14 +149,14 @@ EMCC_FLAGS =\
 
 # Build main WASM binary for browsers that support WASM SIMD.
 build/tesseract-core.js build/tesseract-core.wasm: src/lib.cpp src/tesseract-init.js build/tesseract.uptodate
-	$(EMSDK_DIR)/emcc src/lib.cpp $(EMCC_FLAGS) \
+	emcc src/lib.cpp $(EMCC_FLAGS) \
 		-I$(INSTALL_DIR)/include/ -L$(INSTALL_DIR)/lib/ -ltesseract -lleptonica -lembind \
 		-o build/tesseract-core.js
 
 # Build fallback WASM binary for browsers that don't support WASM SIMD. The JS
 # output from this build is not used.
 build/tesseract-core-fallback.js build/tesseract-core-fallback.wasm: src/lib.cpp src/tesseract-init.js build/tesseract-fallback.uptodate
-	$(EMSDK_DIR)/emcc src/lib.cpp $(EMCC_FLAGS) \
+	emcc src/lib.cpp $(EMCC_FLAGS) \
 		-I$(INSTALL_DIR)/include/ -L$(FALLBACK_INSTALL_DIR)/lib/ -L$(INSTALL_DIR)/lib -ltesseract -lleptonica -lembind \
 		-o build/tesseract-core-fallback.js
 

third_party_versions.mk

@@ -1,6 +1,3 @@
-# v3.1.61
-EMSDK_COMMIT=ca7b40ae222a2d8763b6ac845388744b0e57cfb7
-
 # v1.84.1
 LEPTONICA_COMMIT=7e803e73511fbd320f01314c141d35d2b8491dde