Ian, I think this patch or one related to it may have broken the expected behaviour. Previously I could do: $ ghc -M Main.hs but now executing the above gives the error "You must specify at least one -dep-suffix". I can get the old behaviour by doing: $ ghc -M Main.hs -dep-suffix='' If the new behaviour is the expected one, then the userguide is now out of date. Cheers, David On 2 November 2012 16:38, Ian Lynagh wrote:

Repository : ssh://darcs.haskell.org//srv/darcs/ghc

On branch : master

http://hackage.haskell.org/trac/ghc/changeset/af072fc35d8dbe7962e62700da0525...

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commit af072fc35d8dbe7962e62700da052593e999c0ef Author: Ian Lynagh Date: Fri Nov 2 21:42:33 2012 +0000

Change how dependency generation works; fixes #7381

We now do the initial dependency generation for the vanilla way regardless of what way flags and hisuf/osuf flags are given. This makes it easier to generate the right dependency info in the end.

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compiler/main/DriverMkDepend.hs | 41 ++++++++++++++++++++++---------------- ghc.mk | 5 ++++ ghc/ghc.mk | 2 +- rules/build-dependencies.mk | 12 +---------- 4 files changed, 31 insertions(+), 29 deletions(-)

diff --git a/compiler/main/DriverMkDepend.hs b/compiler/main/DriverMkDepend.hs index 953b2c4..7355e31 100644 --- a/compiler/main/DriverMkDepend.hs +++ b/compiler/main/DriverMkDepend.hs @@ -51,7 +51,25 @@ import Data.Maybe ( isJust ) doMkDependHS :: GhcMonad m => [FilePath] -> m () doMkDependHS srcs = do -- Initialisation - dflags <- GHC.getSessionDynFlags + dflags0 <- GHC.getSessionDynFlags + + -- We kludge things a bit for dependency generation. Rather than + -- generating dependencies for each way separately, we generate + -- them once and then duplicate them for each way's osuf/hisuf. + -- We therefore do the initial dependency generation with an empty + -- way and .o/.hi extensions, regardless of any flags that might + -- be specified. + let dflags = dflags0 { + ways = [], + buildTag = mkBuildTag [], + hiSuf = "hi", + objectSuf = "o" + } + _ <- GHC.setSessionDynFlags dflags + + when (null (depSuffixes dflags)) $ + ghcError (ProgramError "You must specify at least one -dep-suffix") + files <- liftIO $ beginMkDependHS dflags

-- Do the downsweep to find all the modules @@ -263,24 +281,13 @@ writeDependency root hdl targets dep ----------------------------- insertSuffixes :: FilePath -- Original filename; e.g. "foo.o" - -> [String] -- Extra suffices e.g. ["x","y"] - -> [FilePath] -- Zapped filenames e.g. ["foo.o", "foo.x_o", "foo.y_o"] + -> [String] -- Suffix prefixes e.g. ["x_", "y_"] + -> [FilePath] -- Zapped filenames e.g. ["foo.x_o", "foo.y_o"] -- Note that that the extra bit gets inserted *before* the old suffix - -- We assume the old suffix contains no dots, so we can strip it with removeSuffix - - -- NOTE: we used to have this comment - -- In order to construct hi files with alternate suffixes, we - -- now have to find the "basename" of the hi file. This is - -- difficult because we can't just split the hi filename - -- at the last dot - the hisuf might have dots in it. So we - -- check whether the hi filename ends in hisuf, and if it does, - -- we strip off hisuf, otherwise we strip everything after the - -- last dot. - -- But I'm not sure we care about hisufs with dots in them. - -- Lots of other things will break first! - + -- We assume the old suffix contains no dots, so we know where to + -- split it insertSuffixes file_name extras - = file_name : [ basename <.> (extra ++ "_" ++ suffix) | extra <- extras ] + = [ basename <.> (extra ++ suffix) | extra <- extras ] where (basename, suffix) = case splitExtension file_name of -- Drop the "." from the extension diff --git a/ghc.mk b/ghc.mk index c1544ad..6c0a29a 100644 --- a/ghc.mk +++ b/ghc.mk @@ -138,6 +138,11 @@ ifeq "$(findstring v,$(GhcLibWays))" "" $(error v is not in $$(GhcLibWays), and $$(DYNAMIC_BY_DEFAULT) is not YES) endif endif +ifeq "$(GhcProfiled)" "YES" +ifeq "$(findstring p,$(GhcLibWays))" "" +$(error p is not in $$(GhcLibWays), and $$(GhcProfiled) is YES) +endif +endif endif

ifeq "$(phase)" "" diff --git a/ghc/ghc.mk b/ghc/ghc.mk index ac8ce66..809756e 100644 --- a/ghc/ghc.mk +++ b/ghc/ghc.mk @@ -64,7 +64,7 @@ ghc_stage3_MORE_HC_OPTS += -threaded endif

ifeq "$(GhcProfiled)" "YES" -ghc_stage2_MORE_HC_OPTS += -prof +ghc_stage2_PROGRAM_WAY = p endif

ghc_stage1_PROG = ghc-stage1$(exeext) diff --git a/rules/build-dependencies.mk b/rules/build-dependencies.mk index 8442801..4a4f563 100644 --- a/rules/build-dependencies.mk +++ b/rules/build-dependencies.mk @@ -22,18 +22,8 @@ $1_$2_depfile_c_asm = $$($1_$2_depfile_base).c_asm

$1_$2_C_FILES_DEPS = $$(filter-out $$($1_$2_C_FILES_NODEPS),$$($1_$2_C_FILES))

-$1_$2_MKDEPENDHS_FLAGS = -dep-makefile $$($1_$2_depfile_haskell).tmp $$(foreach way,$$(filter-out v,$$($1_$2_WAYS)),-dep-suffix $$(way)) +$1_$2_MKDEPENDHS_FLAGS = -dep-makefile $$($1_$2_depfile_haskell).tmp $$(foreach way,$$($1_$2_WAYS),-dep-suffix "$$(patsubst %o,%,$$($$(way)_osuf))") $1_$2_MKDEPENDHS_FLAGS += -include-pkg-deps -# Setting hisuf/osuf is a kludge. If DYNAMIC_BY_DEFAULT is on, dyn is -# the first way, and p is another way, then without this kludge we run -# ghc -M -hisuf dyn_hi -osuf dyn_o -dep-suffix dyn -dep-suffix p -# which means we get dependencies for .dyn_hi/.dyn_o and .p_dyn_hi/.p_dyn_o -# rather than .dyn_hi/.dyn_o and .p_hi/.p_o. -# With the kludge we also get .hi/.o dependencies that we don't need, but -# they don't do any harm. -# We also specify -static, as otherwise we end up with some dependencies -# on .dyn_dyn_hi files -$1_$2_MKDEPENDHS_FLAGS += -static -hisuf hi -osuf o

ifneq "$$(NO_GENERATED_MAKEFILE_RULES)" "YES"

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