[llvm-bugs] [Bug 44227] New: Segmentation fault with -ffast-math when compiling GraphViz (lab.c)

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Thu Dec 5 01:50:26 PST 2019


            Bug ID: 44227
           Summary: Segmentation fault with -ffast-math when compiling
                    GraphViz (lab.c)
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: LLVM Codegen
          Assignee: unassignedclangbugs at nondot.org
          Reporter: gabriel-llvm-bugs at mastergk.de
                CC: llvm-bugs at lists.llvm.org, neeilans at live.com,
                    richard-llvm at metafoo.co.uk

Created attachment 22896
  --> https://bugs.llvm.org/attachment.cgi?id=22896&action=edit
Source file created by crash reporter

When compiling Viz.js (GraphViz for the web) the compiler segfaults while
compiling "lab.c" of GraphViz. I reduced the problem to:

emcc -ffast-math lab.c

> emcc --version
emcc (Emscripten gcc/clang-like replacement) 1.39.1 ((unknown revision))

> /usr/lib/emscripten-llvm/clang --version
clang version 10.0.0 (/srcdest/llvm-project

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