[all-commits] [llvm/llvm-project] ea3a3b: [flang] Handle continuation line edge case (#74751)

[Peter Klausler via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: ea3a3b25b93664c8be750ac3cd550855dcd1848b
      https://github.com/llvm/llvm-project/commit/ea3a3b25b93664c8be750ac3cd550855dcd1848b
  Author: Peter Klausler <35819229+klausler at users.noreply.github.com>
  Date:   2023-12-11 (Mon, 11 Dec 2023)

  Changed paths:
    M flang/lib/Parser/prescan.cpp
    M flang/lib/Parser/prescan.h
    R flang/test/Parser/continuation-before-quote.f90
    A flang/test/Parser/continuation-without-ampersand.f90

  Log Message:
  -----------
  [flang] Handle continuation line edge case (#74751)

For a character literal that is split over more than one source line
with free form line continuation using '&'
at the end of one line but missing the standard-required '&' on the
continuation line, also handle the case of spaces at the beginning of
the continuation line.
    
For example,
    
PRINT *, 'don'&
   't poke the bear'
    
now prints "don't poke the bear", like nearly all other Fortran
compilers do.
    
This is not strictly standard conforming behavior, and the compiler
emits a portability warning with -pedantic.
    
Fixes llvm-test-suite/Fortran/gfortran/regression/continuation_1.f90,
.../continuation_12.f90, and .../continuation_13.f90.