[llvm-bugs] [Bug 39136] New: Clang crash when compiling buggy code in 7.0

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=39136

            Bug ID: 39136
           Summary: Clang crash when compiling buggy code in 7.0
           Product: clang
           Version: 7.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: james.chicken at xtxmarkets.com
                CC: llvm-bugs at lists.llvm.org

Created attachment 20946
  --> https://bugs.llvm.org/attachment.cgi?id=20946&action=edit
Stack dump from compiling the excerpt as well as preprocessed source and run
script

When compiling our C++17 codebase I encounter a segmentation fault in clang
7.0. It's when compiling an invalid program admittedly but of course the
compiler should not crash regardless. I ran creduce on the example and it cut
it down to this excerpt:

template <a> qwertyuiopasdfghjklz;
template b()->qwertyuiopasdfghjklz<>;

The length of symbol 'qwertyuiopasdfghjklz' is actually important for the
crash. I found I cannot reproduce with a token shorter than above, but that
length or larger causes the crash.

I have attached the output I get when attempting to compile the excerpt, as
well as the preprocessed source and associated run script.

We build clang like this (tl;dr build from source using gcc 8.2):
export LINK_FLAGS="-Wl,-rpath,/gcc-8.2/lib64 -L/gcc-8.2/lib64"
cmake \
    -G "Unix Makefiles" \
    -DCMAKE_INSTALL_PREFIX=/home/jchicke/clang-7 \
    -DCMAKE_BUILD_TYPE=RelWithDebInfo \
    -DCMAKE_SHARED_LINKER_FLAGS=$LINK_FLAGS \
    -DCMAKE_MODULE_LINKER_FLAGS=$LINK_FLAGS \
    -DCMAKE_EXE_LINKER_FLAGS=$LINK_FLAGS \
    -DCMAKE_C_LINK_FLAGS=$LINK_FLAGS \
    -DLLVM_OPTIMIZED_TABLEGEN=On \
    -DLLVM_BINUTILS_INCDIR=/gcc-8.2/include \
    ../src

Any more info you need please ask.

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