[llvm-bugs] [Bug 46021] New: flang --help should document external compiler requirement and F18_FC

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=46021

            Bug ID: 46021
           Summary: flang --help should document external compiler
                    requirement and F18_FC
           Product: flang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Frontend
          Assignee: unassignedbugs at nondot.org
          Reporter: balay at mcs.anl.gov
                CC: David.Truby at arm.com, jperier at nvidia.com,
                    kirankumartp at gmail.com, llvm-bugs at lists.llvm.org,
                    sscalpone at nvidia.com

Currently flang automatically invokes pgf90 - and fails if not found

[balay at pj01 junk]$ flang sizeof-ftn.f 
execvp(pgf90) failed: No such file or directory


Perhaps this external compiler requirement should be documented in --help -
with the suggestion to use 'export F18_FC=gfortran' to switch to gfortran?

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