[llvm-bugs] [Bug 41246] New: Compilation time is incredible slow

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=41246

            Bug ID: 41246
           Summary: Compilation time is incredible slow
           Product: clang
           Version: unspecified
          Hardware: Other
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: jacob at jacob.remcomp.fr
                CC: blitzrakete at gmail.com, dgregor at apple.com,
                    erik.pilkington at gmail.com, llvm-bugs at lists.llvm.org,
                    richard-llvm at metafoo.co.uk

I have compiled 2.5MB of C source code with clang 5.0 and 9.0. 
Machine: ARM64 quadcore CPU, with 4GB RAM and SSD of 1TB.

Compiling with optimizations ON (-O2)

Compiler    Time
lcc         8.7 seconds
gcc         2minutes 30 seconds
clang 5.0   26 minutes
clang 9.0   32 minutes

This is just unbearable and makes clang unusable.

Thanks in advance for your attention.

jacob navia

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