C parser

C parser is defined in src/frontc using ANTLR.

To build a C parser from tapenade directory:

./gradlew frontc

It creates a Java archive in build/libs/frontc.jar.

java -classpath $TAPENADE_HOME/build/libs/frontc.jar fr/inria/frontc/C2IL <file.c> translates <file.c> into an IL abstract tree.