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On platforms that are not officially supported by GNU Autotools (like OS/2) it is necessary to generate configure and other related stuff using platform-specific Autoconf and Automake to make the build succeed. A script autoconf.sh added by this commit does that. Note that it's necessary to remove pre-generated upstream versions of these files from Git completely in order to avoid seeing multiple differences resulting from different versions of Autotools (and also to save some space - configure files are huge). This commit also adds a few minor bits to configure.ac/Makefile.am of a few projects to help autoconf.sh do its job properly. Needed for #2.
AddressSanitizer and ThreadSanitizer (https://github.com/google/sanitizers) are projects initially developed by Google Inc. Both tools consist of a compiler module and a run-time library. The sources of the run-time library for these projects are hosted at https://llvm.org/svn/llvm-project/compiler-rt in the following directories: include/sanitizer lib/sanitizer_common lib/interception lib/asan lib/tsan lib/lsan lib/ubsan Trivial and urgent fixes (portability, build fixes, etc.) may go directly to the GCC tree. All non-trivial changes, functionality improvements, etc. should go through the upstream tree first and then be merged back to the GCC tree. The merges from upstream should be done with the aid of the merge.sh script; it will also update the file MERGE to contain the upstream revision we merged with.