Gracefully Handle Sensible Bad Code

g77 generally should continue processing for warnings and recoverable (user) errors whenever possible--that is, it shouldn't gratuitously make bad or useless code.

For example:

     INTRINSIC ZABS
     CALL FOO(ZABS)
     END
     

When compiling the above with -ff2c-intrinsics-disable, g77 should indeed complain about passing ZABS, but it still should compile, instead of rejecting the entire CALL statement. (Some of this is related to improving the compiler internals to improve how statements are analyzed.)