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19694e1f2e by Silvio Traversaro <silvio@traversaro.it>:
Do not pass explicitly -O2 flag to compiler in Release build
COPYBARA_INTEGRATE_REVIEW=https://github.com/google/gemma.cpp/pull/3 from traversaro:patch-1 19694e1f2e
PiperOrigin-RevId: 610096914
It's not possible to build `gemma.cpp` with the standard MSVC front-end
as it doesn't support arrays more than `0x7ffffffff` bytes (see Compiler Error C2148),
however this isn't a problem with the optional Visual Studio Clang/LLVM frontend.
This can be specified using the `-T` flag when running CMake:
```
$ cmake -B build -T ClangCL
$ cmake --build build --config Release
```
Windows doesn't provide `pread`/`pwrite` so this must be emulated using
the `ReadFile`/`WriteFile` Win32 APIs.
`_CRT_SECURE_NO_WARNINGS` is defined to prevent a large number of warnings
about using "depricated" function names (e.g. `close` instead of `_close`).
`NOMINMAX` is defined to prevent the `min`/`max` macros from `windows.h`
from conflicting with expressions like `std::min`. Generally libraries should
avoid including `windows.h` in their public headers or define `WIN32_LEAN_AND_MEAN`
before including the `windows.h` header, but this unfortunately isn't always the case.
Jan Wassenberg
austinvhuang
Phil Culliton
Copybara-Service
Dan Zheng
Silvio Traversaro
Yuta Hayashibe
David Coles
Austin Huang