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# Build flavours
Hadrian supports a few predefined _build flavours_, i.e. collections of build
settings that fully define a GHC build (see `src/Flavour.hs`). Users can add their
own build flavours if need be, as described
[here](https://gitlab.haskell.org/ghc/ghc/blob/master/hadrian/doc/user-settings.md#build-flavour).
## Arguments
The following table summarises extra arguments passed to GHC in different build flavours.
There are four groups of arguments: arguments in `hsDefault` are passed to GHC for all Haskell
source files, `hsLibrary` arguments are added when compiling libraries, `hsCompiler`
when compiling the `compiler` library, and `hsGhc` when compiling/linking the GHC program.
<table>
<tr>
<th rowspan="3">Flavour</th>
<th colspan="8">Extra arguments</th>
</tr>
<tr>
<th colspan="2">hsDefault</td>
<th colspan="2">hsLibrary</td>
<th colspan="2">hsCompiler</td>
<th colspan="2">hsGhc</td>
</tr>
<tr>
<th>stage0</td>
<th>stage1+</td>
<th>stage0</td>
<th>stage1+</td>
<th>stage0</td>
<th>stage1+</td>
<th>stage0</td>
<th>stage1+</td>
</tr>
<tr>
<th>default<br></td>
<td>-O<br>-H64m<br></td>
<td>-O2<br>-H64m</td>
<td></td>
<td>-haddock</td>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
<tr>
<th>quick</td>
<td>-O0<br>-H64m</td>
<td>-O0<br>-H64m</td>
<td></td>
<td>-O</td>
<td>-O2</td>
<td>-O</td>
<td>-O</td>
<td></td>
</tr>
<tr>
<th>quickest</td>
<td>-O0<br>-H64m</td>
<td>-O0<br>-H64m</td>
<td></td>
<td></td>
<td>-O</td>
<td></td>
<td>-O</td>
<td></td>
</tr>
<tr>
<th>perf</td>
<td>-O<br>-H64m</td>
<td>-O<br>-H64m</td>
<td></td>
<td>-O2</td>
<td>-O2</td>
<td>-O2</td>
<td>-O</td>
<td>-O2</td>
</tr>
<tr>
<th>prof</td>
<td>-O0<br>-H64m</td>
<td>-O0<br>-H64m</td>
<td></td>
<td>-O</td>
<td>-O2</td>
<td>-O</td>
<td>-O</td>
</tr>
<tr>
<th>bench</td>
<td>-O<br>-H64m</td>
<td>-O<br>-H64m</td>
<td></td>
<td>-O2</td>
<td>-O2</td>
<td>-O0</td>
<td>-O2</td>
<td>-O2</td>
</tr>
<tr>
<th>devel1</td>
<td>-O<br>-H64m</td>
<td>-O<br>-H64m</td>
<td></td>
<td>-dcore-lint</td>
<td>-O0<br>-DDEBUG</td>
<td></td>
<td>-O0<br>-DDEBUG</td>
<td></td>
</tr>
<tr>
<th>devel2</td>
<td>-O<br>-H64m</td>
<td>-O<br>-H64m</td>
<td></td>
<td>-dcore-lint</td>
<td>-O2</td>
<td>-O0<br>-DDEBUG</td>
<td></td>
<td>-O0<br>-DDEBUG</td>
</tr>
<tr>
<th>validate</td>
<td>-O0<br>-H64m</td>
<td>-fllvm-fill-undef-with-garbage</td>
<td></td>
<td>-O<br>-dcore-lint<br>-dno-debug-output</td>
<td>-O2<br>-DDEBUG</td>
<td>-O<br>-dcore-lint<br>-dno-debug-output</td>
<td>-O</td>
<td>-O</td>
</tr>
<tr>
<th>validate</td>
<td>-O0<br>-H64m</td>
<td>-fllvm-fill-undef-with-garbage</td>
<td></td>
<td>-O<br>-dcore-lint<br>-dno-debug-output</td>
<td>-O2<br>-DDEBUG</td>
<td>-O<br>-DDEBUG<br>-dcore-lint<br>-dno-debug-output</td>
<td>-O</td>
<td>-O</td>
</tr>
</table>
### LLVM variants
In addition to the above, there are LLVM variants for the flavours `quick`,
`prof`, `perf` and `bench`, available by appending a `-llvm` suffix (i.e.,
`quick-llvm` for the LLVM variant of `quick`). These differ only in that there
is an additional `-fllvm` flag in `hsDefault` when the stage0 compiler is GHC.
See `src/Settings/Flavours/Llvm.hs` for details.
## Ways
Libraries and GHC can be built in different _ways_, e.g. with or without profiling
information. The following table lists ways that are built in different flavours.
<table>
<tr>
<th rowspan="2">Flavour</th>
<th colspan="2">Library ways</th>
<th colspan="2">RTS ways</th>
<th colspan="2">Profiled GHC</th>
</tr>
<tr>
<th>stage0</th>
<th>stage1+</th>
<th>stage0</th>
<th>stage1+</th>
<th>stage0</th>
<th>stage1+</th>
</tr>
<tr>
<th>default<br>perf<br>prof<br>devel1<br>devel2<br>perf-llvm<br>prof-llvm</td>
<td>vanilla</td>
<td>vanilla<br>profiling<br>dynamic</td>
<td>logging<br>debug<br>threaded<br>threadedDebug<br>threadedLogging
<br>debugDynamic<br>threadedDynamic<br>threadedDebugDynamic
<br>loggingDynamic<br>threadedLoggingDynamic
</td>
<td>
logging<br>debug<br>threaded<br>threadedDebug<br>
threadedLogging<br>threadedProfiling
<br>debugDynamic<br>threadedDynamic<br>threadedDebugDynamic
<br>loggingDynamic<br>threadedLoggingDynamic
</td>
<td>Only in<br>prof<br>flavour</td>
<td>Only in<br>prof<br>flavour</td>
</tr>
<tr>
<th>quick<br>quick-llvm</th>
<td>vanilla</td>
<td>vanilla<br>dynamic</td>
<td>logging<br>debug<br>threaded<br>threadedDebug<br>threadedLogging
<br>debugDynamic<br>threadedDynamic<br>threadedDebugDynamic
<br>loggingDynamic<br>threadedLoggingDynamic
</td>
<td>logging<br>debug<br>threaded<br>threadedDebug<br>threadedLogging
<br>debugDynamic<br>threadedDynamic<br>threadedDebugDynamic
<br>loggingDynamic<br>threadedLoggingDynamic
</td>
<td>No</td>
<td>No</td>
</tr>
<tr>
<th>quickest<br>bench</th>
<td>vanilla</td>
<td>vanilla</td>
<td>vanilla<br>threaded</td>
<td>vanilla<br>threaded</td>
<td>No</td>
<td>No</td>
</tr>
</table>
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