customization: overridable SHA_SUM

Author: Christopher J. Brody

Makefile

@@ -16,6 +16,7 @@ EXTENSION_FUNCTIONS_URL = https://www.sqlite.org/contrib/download/extension-func
 EXTENSION_FUNCTIONS_SHA1 = c68fa706d6d9ff98608044c00212473f9c14892f
 
 EMCC=emcc
+SHA_SUM=sha1sum # TODO submit to upstream sql-js version
 
 CFLAGS = \
 	-O2 \
@@ -178,15 +179,15 @@ sqlite-src: sqlite-src/$(SQLITE_AMALGAMATION) sqlite-src/$(EXTENSION_FUNCTIONS)
 sqlite-src/$(SQLITE_AMALGAMATION): cache/$(SQLITE_AMALGAMATION).zip
 	mkdir -p sqlite-src
 	echo '$(SQLITE_AMALGAMATION_ZIP_SHA1)  ./cache/$(SQLITE_AMALGAMATION).zip' > cache/check.txt
-	sha1sum -c cache/check.txt
+	$(SHA_SUM) -c cache/check.txt
 	rm -rf $@
 	unzip -u 'cache/$(SQLITE_AMALGAMATION).zip' -d sqlite-src/
 	touch $@
 
 sqlite-src/$(SQLITE_AMALGAMATION)/$(EXTENSION_FUNCTIONS): cache/$(EXTENSION_FUNCTIONS)
 	mkdir -p sqlite-src
 	echo '$(EXTENSION_FUNCTIONS_SHA1)  ./cache/$(EXTENSION_FUNCTIONS)' > cache/check.txt
-	sha1sum -c cache/check.txt
+	$(SHA_SUM) -c cache/check.txt
 	cp 'cache/$(EXTENSION_FUNCTIONS)' $@
 
 

README.md

@@ -22,6 +22,7 @@ Sql.js predates WebAssembly, and thus started as an [asm.js](https://en.wikipedi
 - remove extension-functions from build
 - enable FTS4
 - enable R-Tree
+- overridable `SHA_SUM` definition in Makefile
 
 ## Documentation
 A [full documentation](https://sql-js.github.io/sql.js/documentation/class/Database.html) generated from comments inside the source code, is available.