src/third_party/glslang/src/glslang/updateGrammar

#!/bin/bash

if [ "$1" = 'web' ]
then
    m4 -P -DGLSLANG_WEB MachineIndependent/glslang.m4 > MachineIndependent/glslang.y
elif [ "$#" -eq 0 ]
then
    m4 -P MachineIndependent/glslang.m4 > MachineIndependent/glslang.y
else
    echo usage:
    echo $0 web
    echo $0
    exit
fi

bison --defines=MachineIndependent/glslang_tab.cpp.h -t MachineIndependent/glslang.y -o MachineIndependent/glslang_tab.cpp