Strip comments before compiling for solidity contracts to avoid hitting

bug described in ethereum/solc-js#460

solidity_contracts/compile_tools/compile_solidity_contract.sh

@@ -31,7 +31,51 @@ set -o pipefail
 # 3 solcjs --starndard-json has some bugs (https://github.com/ethereum/solc-js/issues/460) so we can only use "content" as input.
 # 4 To copy the source code into the json file, we have to escape \\ \" \t \n. (Ignore \b \r \f as we shouldn't have them in sol file)
 tmpfile=$(mktemp)
-cat "$SOLIDITY_SOURCE_FILE_PATH" \
+awk 'BEGIN {
+ found=0;
+ }
+
+ {
+ spos=index($0,"/*");
+ epos=index($0,"*/");
+
+ if(spos > 0 && epos ==0)
+ {
+ printf("%s\n",substr($0,1,spos-1));
+ found=1;
+ }
+ else if(spos == 0 && epos >0)
+ {
+ found=0;
+ if(length($0) != epos+1)
+ {
+ printf("%s\n",substr($0,epos+2));
+ }
+ }
+ else if(spos > 0 && epos > 0)
+ {
+ printf("%s %s\n",substr($0,1,spos-1),substr($0,epos+2));
+ }
+ else if(found==0)
+ {
+ cpp_comment=index($0,"//");
+ if(cpp_comment == 0)
+ {
+ print;
+ }
+ else
+ {
+ printf("%s\n",substr($0,1,cpp_comment-1));
+ }
+ }
+ }
+
+ END {
+ if(found==1)
+ {
+ print "there is unmatched comment"
+ }
+ }' "$SOLIDITY_SOURCE_FILE_PATH" \
 | awk -v token="__CONTRACT_CONTENT" '
  BEGIN {
  RS = "\0" # Set record separator to null to read the whole input