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Remove tlsEmulation enabled from Windows + GCC config (#19119) [backport:1.6]

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This flag has a very significant performance impact on programs compiled with --threads:on. It is also apparently not needed anymore for standard circumstances. Can we remove the config? See https://github.com/nim-lang/Nim/issues/18146#issuecomment-876802676 for discussion and perf impact. [backport:1.6]
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Ryan Oldenburg 2021-11-10 23:48:22 -06:00 • committed by GitHub
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config/nim.cfg
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@ -154,9 +154,6 @@ nimblepath="$home/.nimble/pkgs/"
# Configuration for the GNU C/C++ compiler:
@if windows:
#gcc.path = r"$nim\dist\mingw\bin"
@if gcc or tcc:
tlsEmulation:on
@end
@end
gcc.maxerrorsimpl = "-fmax-errors=3"