compiler_PACKAGE = ghc
+# Note [fiddle-stage1-version]
+# The version of the GHC package changes every day, since the
+# patchlevel is the current date. We don't want to force
+# recompilation of the entire compiler when this happens, so for stage
+# 1 we omit the patchlevel from the version number. For stage 2 we
+# have to include the patchlevel since this is the package we install,
+# however.
+#
+# Note: we also have to tweak the version number of the package itself
+# when it gets registered; see Note [munge-stage1-package-config]
+# below.
+ifneq "$(ProjectPatchLevel)" "0"
+define compiler_PACKAGE_MAGIC
+compiler_stage1_VERSION = $(subst .$(ProjectPatchLevel),,$(ProjectVersion))
+endef
+endif
+
# haddocking only happens for stage2
compiler_stage1_DO_HADDOCK = NO
compiler_stage3_DO_HADDOCK = NO
$(compiler_stage1_depfile) : $(includes_H_CONFIG) $(includes_H_PLATFORM) $(includes_GHCCONSTANTS) $(includes_DERIVEDCONSTANTS) $(PRIMOP_BITS)
$(compiler_stage2_depfile) : $(includes_H_CONFIG) $(includes_H_PLATFORM) $(includes_GHCCONSTANTS) $(includes_DERIVEDCONSTANTS) $(PRIMOP_BITS)
$(compiler_stage3_depfile) : $(includes_H_CONFIG) $(includes_H_PLATFORM) $(includes_GHCCONSTANTS) $(includes_DERIVEDCONSTANTS) $(PRIMOP_BITS)
+
+# Note [munge-stage1-package-config]
+# Strip the date/patchlevel from the version of stage1. See Note
+# [fiddle-stage1-version] above.
+ifneq "$(ProjectPatchLevel)" "0"
+compiler/stage1/inplace-pkg-config-munged: compiler/stage1/inplace-pkg-config
+ sed "s#.$(ProjectPatchLevel)##" <$< >$@
+ $(compiler_stage1_GHC_PKG) update --force $(compiler_stage1_GHC_PKG_OPTS) $@
+
+$(compiler_stage1_v_LIB) : compiler/stage1/inplace-pkg-config-munged
+endif
+
endif