[llvm-bugs] [Bug 50059] New: flang takes way too long to build

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=50059

            Bug ID: 50059
           Summary: flang takes way too long to build
           Product: flang
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Frontend
          Assignee: unassignedbugs at nondot.org
          Reporter: nicolasweber at gmx.de
                CC: David.Truby at arm.com, jperier at nvidia.com,
                    kirankumartp at gmail.com, llvm-bugs at lists.llvm.org,
                    sscalpone at nvidia.com

I built flang to make sure https://reviews.llvm.org/D100957 doesn't break its
build.

flang has _several_ TUs that take several minutes to build, way more than the
rest of llvm/clang/mlir etc combined.

semantics.cpp: 55s
fold-character.cpp: 62s
check-omp-structure.cpp: 70s
fold.cpp: 117s
fold-complex.cpp: 131s
tools.cpp: 150s
fold-integer.cpp: still compiling as I write this, 200s in

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