Add "bench" build flavour to build system

This build generates the same code as the "perf" build and is thus
good for compiling benchmarks and inspecting the generated
code. However, it compiles the stage2 compiler faster at the expense
of compiler user programs more slowly.

1 files changed, 64 insertions, 0 deletions

diff --git a/mk/build.mk.sample b/mk/build.mk.sample
index cb049ba494..a16eb0fa36 100644
--- a/mk/build.mk.sample
+++ b/mk/build.mk.sample
@@ -40,6 +40,17 @@
 # A development build, working on the stage 2 compiler:
 #BuildFlavour = devel2
 
+# A build with max optimisation that still builds the stage2 compiler
+# quickly. Compiled code will be the same as with "perf". Programs
+# will compile more slowly.
+#BuildFlavour = bench
+
+# As above but build GHC using the LLVM backend
+#BuildFlavour = bench-llvm
+
+# Bench build configured for a cross-compiler
+#BuildFlavour = bench-cross
+
 # -------- Miscellaneous variables --------------------------------------------
 
 # Set to V = 0 to get prettier build output.
@@ -235,6 +246,59 @@ LAX_DEPENDENCIES   = YES
 
 endif
 
+# -------- A bench build with optimised libs -----------------------------------
+
+ifeq "$(BuildFlavour)" "bench"
+
+SRC_HC_OPTS        = -O -H64m
+GhcStage1HcOpts    = -O -fasm
+GhcStage2HcOpts    = -O0 -fasm
+GhcLibHcOpts       = -O2 -fasm
+SplitObjs          = NO
+HADDOCK_DOCS       = NO
+BUILD_DOCBOOK_HTML = NO
+BUILD_DOCBOOK_PS   = NO
+BUILD_DOCBOOK_PDF  = NO
+
+endif
+
+# ---------------- Perf build using LLVM --------------------------------------
+
+ifeq "$(BuildFlavour)" "bench-llvm"
+
+SRC_HC_OPTS        = -O -H64m
+GhcStage1HcOpts    = -O -fllvm
+GhcStage2HcOpts    = -O0 -fllvm
+GhcLibHcOpts       = -O2 -fllvm
+SplitObjs          = NO
+HADDOCK_DOCS       = NO
+BUILD_DOCBOOK_HTML = NO
+BUILD_DOCBOOK_PS   = NO
+BUILD_DOCBOOK_PDF  = NO
+
+endif
+
+# ------- A Perf build configured for cross-compilation ----------------------
+
+ifeq "$(BuildFlavour)" "bench-cross"
+
+SRC_HC_OPTS        = -O -H64m
+GhcStage1HcOpts    = -O -fasm
+GhcStage2HcOpts    = -O0 -fasm
+GhcLibHcOpts       = -O2 -fasm
+SplitObjs          = NO
+INTEGER_LIBRARY    = integer-simple
+Stage1Only         = YES
+HADDOCK_DOCS       = NO
+BUILD_DOCBOOK_HTML = NO
+BUILD_DOCBOOK_PS   = NO
+BUILD_DOCBOOK_PDF  = NO
+
+DYNAMIC_BY_DEFAULT   = NO
+DYNAMIC_GHC_PROGRAMS = NO
+
+endif
+
 # -----------------------------------------------------------------------------
 # Other settings that might be useful