patches for various components of mingw-w64 toolset

a lot of my internal/personal projects tend to have nearly every Windows NT PC in existence as a target. to wit, i have made a collection of patches over time, and are being released to support reproducible builds for https://github.com/loki-project/loki-network on Windows; this is part of the toolchain i have proposed for release engineering there.

Incidentally, these patches mostly affect the 32-bit port, but some are generic enough that the 64-bit build is materially affected by the changes (i.e. physical image contents are different, but have no observable effect on a 64-bit build)

fix-static-libg++-clang.patch, pick-libc.patch, std-fs.patch, suffix.patch are imported from the MINGW-packages AUR (packages: mingw-w64-clang, mingw-w64-gcc). These patches are applied to the top-level directory of their respective archives.

llvm patches:

• compiler-rt-win32.patch (Use pthread with non-Microsoft C)
• fix-static-libg++-clang.patch (no longer needed, but retained in upstream AUR for whatever reason)
• libcxxabi-mingw32.patch (use pthread with non-Microsoft C++)
• libunwind-mingw32.patch (use pthread with non-Microsoft C++)
• llvm-win32-v7.patch (LLVM v7.x: use ProPolice SSP on non-Microsoft C/Windows NT target, various Windows XP bits, and use pseh from ReactOS if llvm is compiled with GCC)
• llvm-v7-with-solaris.patch - (Same as above, but with type casting fixes for floating-point functions. These should be harmless on other platforms. Also patches LLD v7. This patch may supersede the patch above.)
• llvm-win32-v8.patch (like v7, rebased on LLVM v8-pre RC3)
• llvm-trunk-with-solaris.patch (LLVM v8-v9 trunk with patches for a Solaris host. Assumes you are using a custom GCC or Clang paired with the GNU ld or gold, vendor provided GCC is paired with the brain-dead Oracle linker)
  • Note: This patch will be frequently rebased on SVN trunk
• win32_misc.s (requires a MASM386 v5.x+ compatible assembler)

GCC/G++ patches:

All of these are patches on the GCC source tarball (i.e. with all frontends included, except D). Internally, I have abandoned GCC for LLVM, except for libstdc++-v6 (Apple libc++ is linked to the UCRT, which imposes a separate runtime deliverable.), so this section is mostly of public interest.

• pick-libc.patch (override libc selection: default is Microsoft libc v6.1-7.0, this is used to pick libc v8+ or the new UCRT)
• std-fs.patch (enable std::experimental::filesystem for Windows NT targets)
• suffix.patch (some Pascal calling convention fix)
• libg++-win32.patch (patch held over since g++ 5.x)
• clang-inline-typeinfo-bug.patch (See msys2/MINGW-packages#1677. This bug remains in LLVM trunk as of 19-03-19)
• gcc-8.3.0-dist.patch (A patch which combines all of the above changes into a single patch rebased on GCC 8.3. Please continue to use the individual patches on older versions.)

mingw-w64 runtime/CRT patches:

• mingw-w64-v6.patch Revert UCRT fix for __mb_cur_max/__mb_cur_max_func() (I do not impose extra runtime dep on UCRT), patch pthread to use reactos SEH, fix reactos DDK header
  • Note: PSEH only compiles with GCC! Use -fno-ident to avoid leaking multiple copies of the compiler ID string.
  • A binary copy is included for bootstrapping; combine this with libmingw32.a to avoid specifiying -lpseh on the link line.