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Enable IPO/LTO by default except for debug builds (#14198)

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Test case:

```
$ cmake . -DRUN_IN_PLACE=TRUE -DCMAKE_BUILD_TYPE=Release -DBUILD_SERVER=TRUE -DENABLE_TOUCH=FALSE

         minetest minetestserver
W/o LTO:      13M           7.3M
W/  LTO:      11M           5.9M
difference:   15%            19%
```

Also fixes various compiler warnings resulting from compilation using LTO.

---------

Signed-off-by: David Heidelberg <david@ixit.cz>
This commit is contained in:
David Heidelberg 2024-02-09 00:01:12 +01:00 • committed by grorp
parent de09cac1e9
commit 35a83c3514
7 changed files with 49 additions and 33 deletions
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doc/compiling/README.md
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@ -28,6 +28,7 @@ General options and their default values:
ENABLE_REDIS=ON - Build with libhiredis; Enables use of Redis map backend
ENABLE_SPATIAL=ON - Build with LibSpatial; Speeds up AreaStores
ENABLE_SOUND=ON - Build with OpenAL, libogg & libvorbis; in-game sounds
ENABLE_LTO=ON - Build with IPO/LTO optimizations (smaller and more efficient than regular build)
ENABLE_LUAJIT=ON - Build with LuaJIT (much faster than non-JIT Lua)
ENABLE_PROMETHEUS=OFF - Build with Prometheus metrics exporter (listens on tcp/30000 by default)
ENABLE_SYSTEM_GMP=ON - Use GMP from system (much faster than bundled mini-gmp)