Do the dependency-omitting for 'make 1' in a slightly different way

I encountered a couple of things that broke after Ian's previous
patch: one was my nightly build scripts that use 'make stage=2' at the
top level, and the other is 'make fast' in libraries/base, which uses
'stage=0' to avoid building any compilers.

So my version of this patch is more direct: it just turns off the
appropriate dependencies using a variable set by 'make 1', 'make 2',
etc.

1 files changed, 2 insertions, 7 deletions

diff --git a/rules/build-dependencies.mk b/rules/build-dependencies.mk
index a1b55b649f..256261156e 100644
--- a/rules/build-dependencies.mk
+++ b/rules/build-dependencies.mk
@@ -67,22 +67,17 @@ endif # $1_$2_NO_BUILD_DEPS
 $$($1_$2_depfile_haskell) : $$(UNLIT)
 
 ifneq "$$(NO_INCLUDE_DEPS)" "YES"
-# This next test stops us rebuilding all the dep files when doing e.g.
-# "make 1" in compiler or ghc. If stage is blank (just building normally.
-# so we want all deps), or if $3 is stage-1 (when building stage n, we
-# use stage n-1, so we want any dependencies used by the stage n-1
-# compiler), then we want to include the dependencies.
-ifneq "$$(or $$(if $$(stage),,YES),$$(findstring $3,$$(word $$(stage),0 1 2 3)))" ""
 ifneq "$$(strip $$($1_$2_HS_SRCS) $$($1_$2_HS_BOOT_SRCS))" ""
+ifneq "$$(NO_STAGE$3_DEPS)" "YES"
 include $$($1_$2_depfile_haskell)
 endif
+endif
 include $$($1_$2_depfile_c_asm)
 else
 ifeq "$$(DEBUG)" "YES"
 $$(warning not building dependencies in $1)
 endif
 endif
-endif
 
 endef