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Revert LTO for mingw on windows.

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LTO with static linking is still only working with the latest versions of gcc,
causing problems for some devs.

on a modern mingw toolchain LTO optimizations can still be enabled as:

```
CXXFLAGS='-flto' make -j ARCH=x86-64-modern COMP=mingw profile-build
```

fixes https://github.com/official-stockfish/Stockfish/issues/2769

closes https://github.com/official-stockfish/Stockfish/pull/2774

No functional change.
This commit is contained in:
Joost VandeVondele 2020-06-27 08:23:46 +02:00
parent aecfca2dc2
commit ca41ee6632
1 changed files with 11 additions and 1 deletions
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12
src/Makefile
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@ -344,10 +344,20 @@ endif
### needs access to the optimization flags.
ifeq ($(optimize),yes)
ifeq ($(debug), no)
ifeq ($(comp),$(filter $(comp),gcc clang mingw))
ifeq ($(comp),$(filter $(comp),gcc clang))
CXXFLAGS += -flto
LDFLAGS += $(CXXFLAGS)
endif
# To use LTO and static linking on windows, the tool chain requires a recent gcc:
# gcc version 10.1 in msys2 or TDM-GCC version 9.2 are know to work, older might not.
# So, only enable it for a cross from Linux by default.
ifeq ($(comp),mingw)
ifeq ($(KERNEL),Linux)
CXXFLAGS += -flto
LDFLAGS += $(CXXFLAGS)
endif
endif
endif
endif