[llvm-bugs] [Bug 43193] New: -DLLVM_ENABLE_LTO="Thin" fails with gcc-9

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=43193

            Bug ID: 43193
           Summary: -DLLVM_ENABLE_LTO="Thin" fails with gcc-9
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Tooling
          Assignee: unassignedclangbugs at nondot.org
          Reporter: sylvestre at debian.org
                CC: llvm-bugs at lists.llvm.org

% /usr/bin/gcc-8 -flto=thin   -c c.c
% /usr/bin/gcc-9 -flto=thin   -c c.c
cc1: error: unrecognized argument to ‘-flto=’ option: ‘thin’

This is causing the cmake start to fail with:

-- Performing Test HAS_ATTRIBUTE_WARN_UNUSED_RESULT
-- Performing Test HAS_ATTRIBUTE_WARN_UNUSED_RESULT - Failed
-- Performing Test HAVE___ATTRIBUTE__
-- Performing Test HAVE___ATTRIBUTE__ - Failed
-- Performing Test HAVE_DECL_FFS
-- Performing Test HAVE_DECL_FFS - Failed
-- Performing Test HAVE_DECL___BUILTIN_FFS
-- Performing Test HAVE_DECL___BUILTIN_FFS - Failed
-- Performing Test HAVE_DECL__BITSCANFORWARD
-- Performing Test HAVE_DECL__BITSCANFORWARD - Failed
CMake Error at tools/polly/lib/External/CMakeLists.txt:91 (message):
  No ffs implementation found

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