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Summary: This patch is an attempt at making `DenseMapIterator`s "fail-fast". Fail-fast iterators that have been invalidated due to insertion into the host `DenseMap` deterministically trip an assert (in debug mode) on access, instead of non-deterministically hitting memory corruption issues. Enabling fail-fast iterators breaks the LLVM C++ ABI, so they are predicated on `LLVM_ENABLE_ABI_BREAKING_CHECKS`. `LLVM_ENABLE_ABI_BREAKING_CHECKS` by default flips with `LLVM_ENABLE_ASSERTS`, but can be clamped to ON or OFF using the CMake / autoconf build system. Reviewers: chandlerc, dexonsmith, rnk, zturner Subscribers: llvm-commits Differential Revision: http://reviews.llvm.org/D8351 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@233310 91177308-0d34-0410-b5e6-96231b3b80d8
Upgrading autoconf =============================================================================== If you are in the mood to upgrade autoconf, you should: 1. Consider not upgrading. 2. No really, this is a hassle, you don't want to do it. 3. Get the new version of autoconf and put it in <SRC> 4. configure/build/install autoconf with --prefix=<PFX> 5. Run autoupdate on all the m4 macros in llvm/autoconf/m4 6. Run autoupdate on llvm/autoconf/configure.ac 7. Regenerate configure script with AutoRegen.sh 8. If there are any warnings from AutoRegen.sh, fix them and go to step 7. 9. Test, test, test.