Switch to upstream docker image for emscripten build.

.circleci/config.yml

@@ -598,7 +598,7 @@ jobs:
 
   b_ems:
     docker:
-      - image: ethereum/solidity-buildpack-deps:emsdk-1.39.15-1
+      - image: ethereum/solidity-buildpack-deps:emsdk-1.39.15-2
     environment:
       TERM: xterm
     steps:

.circleci/docker/Dockerfile.emscripten

@@ -26,11 +26,9 @@
 # contains a Makefile in the docker/ subdirectory that can be used to create the
 # required base image using:
 #
-#   make version=1.39.15-fastcomp build
+#   make version=1.39.15 build
 #
-# TODO: switch to the upstream backend by removing "-fastcomp".
-#
-FROM emscripten/emsdk:1.39.15-fastcomp AS base
+FROM emscripten/emsdk:1.39.15 AS base
 
 ADD emscripten.jam /usr/src
 RUN set -ex; \
@@ -47,6 +45,7 @@ RUN set -ex; \
 		-DZ3_BUILD_TEST_EXECUTABLES=OFF \
 		-DZ3_BUILD_EXECUTABLE=OFF \
 		-DZ3_SINGLE_THREADED=ON \
+		-DCMAKE_CXX_FLAGS="-s DISABLE_EXCEPTION_CATCHING=0" \
 		..; \
 	make; make install; \
 	rm -r /usr/src/z3; \
@@ -61,6 +60,6 @@ RUN set -ex; \
 	echo "using emscripten : : em++ ;" >> project-config.jam ; \
 	./b2 toolset=emscripten link=static variant=release threading=single runtime-link=static \
 		--with-system --with-filesystem --with-test --with-program_options \
-		cxxflags="-Wno-unused-local-typedef -Wno-variadic-macros -Wno-c99-extensions -Wno-all" \
+		cxxflags="-s DISABLE_EXCEPTION_CATCHING=0 -Wno-unused-local-typedef -Wno-variadic-macros -Wno-c99-extensions -Wno-all" \
 	       --prefix=/emsdk/emscripten/sdk/system install; \
 	rm -r /usr/src/boost_1_73_0

Changelog.md

@@ -8,6 +8,7 @@ Language Features:
 
 Compiler Features:
  * Build system: Update the soljson.js build to emscripten 1.39.15 and boost 1.73.0 and include Z3 for integrated SMTChecker support without the callback mechanism.
+ * Build system: Switch the emscripten build from the fastcomp backend to the upstream backend.
  * Code Generator: Do not introduce new internal source references for small compiler routines.
  * Commandline Interface: Adds new option ``--base-path PATH`` to use the given path as the root of the source tree (defaults to the root of the filesystem).
  * SMTChecker: Support array ``length``.

cmake/EthCompilerSettings.cmake

@@ -16,10 +16,12 @@
 
 include(EthCheckCXXCompilerFlag)
 
+if(NOT EMSCRIPTEN)
 	eth_add_cxx_compiler_flag_if_supported(-fstack-protector-strong have_stack_protector_strong_support)
 	if(NOT have_stack_protector_strong_support)
 		eth_add_cxx_compiler_flag_if_supported(-fstack-protector)
 	endif()
+endif()
 
 eth_add_cxx_compiler_flag_if_supported(-Wimplicit-fallthrough)
 
@@ -109,15 +111,13 @@ if (("${CMAKE_CXX_COMPILER_ID}" MATCHES "GNU") OR ("${CMAKE_CXX_COMPILER_ID}" MA
 			# Re-enable exception catching (optimisations above -O1 disable it)
 			set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -s DISABLE_EXCEPTION_CATCHING=0")
 			# Remove any code related to exit (such as atexit)
-			set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -s NO_EXIT_RUNTIME=1")
+			set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -s EXIT_RUNTIME=0")
 			# Remove any code related to filesystem access
-			set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -s NO_FILESYSTEM=1")
-			# Remove variables even if it needs to be duplicated (can improve speed at the cost of size)
-			set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -s AGGRESSIVE_VARIABLE_ELIMINATION=1")
+			set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -s FILESYSTEM=0")
 			# Allow memory growth, but disable some optimisations
 			set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -s ALLOW_MEMORY_GROWTH=1")
 			# Disable eval()
-			set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -s NO_DYNAMIC_EXECUTION=1")
+			set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -s DYNAMIC_EXECUTION=0")
 			# Disable greedy exception catcher
 			set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -s NODEJS_CATCH_EXIT=0")
 			# Abort if linking results in any undefined symbols

scripts/travis-emscripten/build_emscripten.sh

@@ -54,6 +54,10 @@ cmake \
   -DTESTS=0 \
   ..
 make -j 4 soljson
+# Patch soljson.js for backwards compatibility.
+# TODO: remove this with 0.7.
+# "viiiii" encodes the signature of the callback function.
+sed -i -e 's/addFunction(func,sig){/addFunction(func,sig){sig=sig||"viiiii";/' libsolc/soljson.js
 
 cd ..
 mkdir -p upload