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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>-H32m<br></td>
<td>-O2<br>-H32m</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>quick-validate</td>
<td>-O0<br>-H64m<br>-Werror</td>
<td>-O0<br>-H64m<br>-Werror</td>
<td></td>
<td>-O</td>
<td>-O2</td>
<td>-O</td>
<td>-O</td>
<td></td>
</tr>
<tr>
<th>quick-debug</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>-debug (link)</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>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>slow-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>
<tr>
<th>static</td>
<td>-O<br>-H64m<br>-fPIC -static</td>
<td>-O<br>-H64m<br>-fPIC -static</td>
<td></td>
<td>-O2</td>
<td>-O2</td>
<td>-O2</td>
<td>-O<br>-optl -static</td>
<td>-O2<br>-optl -static</td>
</tr>
</table>
## Flavour transformers
Each of the flavours described above is intended as a starting-point for
configuring your GHC build. In addition, Hadrian supports a number of "flavour
transformers" which modify the configuration in various ways.
These can be appended to the flavour name passed via the `--flavour`
command-line flag, separated by the `+` character. For instance,
```
hadrian --flavour=perf+thread_sanitizer
```
The supported transformers are listed below:
<table>
<tr>
<th>Transformer name</th>
<th>Effect</th>
</tr>
<tr>
<td><code>werror</code></td>
<td>Use the `-Werror` flag for all stage1+ compilation.</td>
</tr>
<tr>
<td><code>debug_info</code></td>
<td>Enable production of native debugging information (via GHC/GCC's `-g3`)
during stage1+ compilations.</td>
</tr>
<tr>
<td><code>ticky_ghc</code></td>
<td>Compile the GHC executable with Ticky-Ticky profiler support.</td>
</tr>
<tr>
<td><code>split_sections</code></td>
<td>Enable section splitting for all libraries (except for the GHC
library due to the long linking times that this causes).</td>
</tr>
<tr>
<td><code>thread_sanitizer</code></td>
<td>Build the runtime system with ThreadSanitizer support</td>
</tr>
<tr>
<td><code>llvm</code></td>
<td>Use GHC's LLVM backend (`-fllvm`) for all stage1+ compilation.</td>
</tr>
<tr>
<td><code>profiled_ghc</code></td>
<td>Build the GHC executable with cost-centre profiling support.
It is recommended that you use this in conjunction with `no_dynamic_ghc` since
GHC does not support loading of profiled libraries with the
dynamic linker. You should use a flavour that builds profiling libs and rts,
i.e. not <code>quick</code>.</td>
</tr>
<tr>
<td><code>no_dynamic_ghc</code></td>
<td>Linked GHC against the statically-linked RTS. This causes GHC to
default to loading static rather than dynamic library when,
e.g., loading libraries during TemplateHaskell evaluations.</td>
</tr>
<tr>
<td><code>no_profiled_libs</code></td>
<td>Disables building of libraries in profiled build ways.</td>
</tr>
<tr>
<td><code>omit_pragmas</code></td>
<td>Build the stage2 compiler with -fomit-interface-pragmas to reduce
recompilation.</td>
</tr>
<tr>
<td><code>ipe</code></td>
<td>Build the stage2 libraries with IPE debugging information for use with -hi profiling.</td>
</tr>
<tr>
<td><code>collect_timings</code></td>
<td>Collects timings while building the stage2+ compiler by adding the
flags <code>-ddump-to-file -ddump-timings</code>.</td>
</tr>
</table>
### Static
The `static` flavour does not strictly follow the groupings in the table
above because it links all the executables statically, not just GHC
itself, and because it passes `-optc -static` when delegating to a C
compiler. It also turns off dynamic linking at runtime by by adding the
`-dynamic-system-linker` cabal flag to the `ghc` package build because
`musl` doesn't allow dynamic linking in executables that were statically
linked against `libc`. Static flags are only added when building in a
non-dynamic _way_. Some of the considerations for a static build aren't
a great fit for the flavour system, so it's a little bit hacky.
## 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>
</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</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>
</tr>
<tr>
<th>static</td>
<td>vanilla</td>
<td>vanilla<br>profiling</td>
<td>logging<br>debug<br>threaded<br>threadedDebug<br>threadedLogging
</td>
<td>
logging<br>debug<br>threaded<br>threadedDebug<br>
threadedLogging<br>threadedProfiling
</td>
<td>Only in<br>prof<br>flavour</td>
<td>Only in<br>prof<br>flavour</td>
</tr>
<tr>
<th>quick<br>quick-validate<br>quick-debug</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>
</tr>
<tr>
<th>quickest<br>bench</th>
<td>vanilla</td>
<td>vanilla</td>
<td>vanilla<br>threaded</td>
<td>vanilla<br>threaded</td>
</tr>
</table>
|
