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[eMTee <2028276@xxxxxxxxxxxxxxxxxx>]

[2023-07-23 10:12] <eMTee> So a gcc 11.2 based official MinGW-w64 compiler gives the same linker errors for HTMLHelp.
[2023-07-23 10:35] <eMTee> And so does winlibs-x86_64-posix-seh-gcc-10.3.0-mingw-w64-9.0.0-r2.7z... 
[2023-07-23 12:30] <eMTee> winlibs-x86_64-posix-seh-gcc-9.3.1-snapshot20210402-mingw-w64-8.0.0-r1.7z also does it whereas winlibs-x86_64-posix-seh-gcc-9.3.0-llvm-10.0.0-mingw-w64-7.0.0-r4.7z doesn't so apparently it happens on MinGW-W64 crt V8.0+ regardless the compiler version.
[2023-07-23 12:33] <eMTee> Since I can't find any obvious changelog item or control option of what causes it I guess it is best to detect and link this additional lib from now.

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https://bugs.launchpad.net/bugs/2028276

Title:
  gcc linker error: undefined reference to `__security_cookie' when
  building with gcc 8.5.0 based MinGW-w64 release

Status in DC++:
  New

Bug description:
  Trying to build DC++ with https://github.com/niXman/mingw-builds-
  binaries/releases/tag/8.5.0-rt_v10-rev0 , win32, seh.

  Got multiple " undefined reference to `__security_cookie'" errors when
  linking the HTMLHelp lib. This is a new issue, does not happen with a
  gcc 8.1 based compiler.

  https://stackoverflow.com/questions/21627607/gcc-linker-error-
  undefined-reference-to-security-cookie probably tells the cause (link
  to MS docs is broken, originally
  <https://web.archive.org/web/20070121194753/http://support.microsoft.com/?id=894573>)

  It says you either need to link bufferoverflowU.lib or build without
  the /GS switch.

  <https://stackoverflow.com/questions/57361083/gcc-equivalent-of-gs-gl-
  gy-oi-md-in-msvc> says "/GS is roughly equivalent to -fstack-
  protector-strong -fstack-clash-protection -D_FORTIFY_SOURCE=2. It also
  requires optimization (e.g., -O2 or -O3)" yet the error still happens
  even when building debug in which case all optimizations should be
  disabled.

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