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| author | Simon Marlow <marlowsd@gmail.com> | 2009-07-07 08:50:40 +0000 |
|---|---|---|
| committer | Simon Marlow <marlowsd@gmail.com> | 2009-07-07 08:50:40 +0000 |
| commit | 0bde11509ca13d4d0914496ee652d7c2b43a0420 (patch) | |
| tree | 590b887273ad06a885d657abb11bdb47a8fe5e59 | |
| parent | a6ce3525d991c7df80aec6355b9d0aa941810a94 (diff) | |
| download | haskell-0bde11509ca13d4d0914496ee652d7c2b43a0420.tar.gz | |
Avoid unnecessary recompilation after ./configure (helps #3228)
We cache the old versions of files generated by configure, so that if
configure touches the file without changing it, we can detect that and
restore the timestamp.
| -rw-r--r-- | Makefile | 29 | ||||
| -rw-r--r-- | ghc.mk | 4 |
2 files changed, 32 insertions, 1 deletions
@@ -51,10 +51,39 @@ include mk/custom-settings.mk # No need to update makefiles for these targets: REALGOALS=$(filter-out bootstrapping-files framework-pkg clean clean_% distclean maintainer-clean show help,$(MAKECMDGOALS)) +# configure touches certain files even if they haven't changed. This +# can mean a lot of unnecessary recompilation after a re-configure, so +# here we cache the old versions of these files so we can restore the +# timestamps. +# +define check-configure-file +# $1 = file +if ! test -f $1.old; then \ + echo "backing up $1"; \ + cp $1 $1.old; \ + touch -r $1 $1.old; \ +else \ + if test $1 -nt $1.old; then \ + if cmp $1 $1.old; then \ + echo "$1 has been touched, but has not changed"; \ + touch -r $1.old $1; \ + else \ + echo "$1 has changed"; \ + cp $1 $1.old; \ + touch -r $1 $1.old; \ + fi \ + fi \ +fi +endef + # NB. not the same as saying '%: ...', which doesn't do the right thing: # it does nothing if we specify a target that already exists. .PHONY: $(REALGOALS) $(REALGOALS) all: + @$(call check-configure-file,mk/config.mk) + @$(call check-configure-file,mk/project.mk) + @$(call check-configure-file,compiler/ghc.cabal) + @echo "===--- updating makefiles phase 0" $(MAKE) -r --no-print-directory -f ghc.mk phase=0 just-makefiles ifneq "$(OMIT_PHASE_1)" "YES" @@ -922,8 +922,10 @@ endif distclean : clean "$(RM)" $(RM_OPTS) config.cache config.status config.log mk/config.h mk/stamp-h "$(RM)" $(RM_OPTS) mk/config.mk mk/are-validating.mk mk/project.mk + "$(RM)" $(RM_OPTS) mk/config.mk.old mk/project.mk.old "$(RM)" $(RM_OPTS) extra-gcc-opts docs/users_guide/ug-book.xml - "$(RM)" $(RM_OPTS) compiler/ghc.cabal ghc/ghc-bin.cabal + "$(RM)" $(RM_OPTS) compiler/ghc.cabal compiler/ghc.cabal.old + "$(RM)" $(RM_OPTS) ghc/ghc-bin.cabal "$(RM)" $(RM_OPTS) libraries/base/include/HsBaseConfig.h "$(RM)" $(RM_OPTS) libraries/directory/include/HsDirectoryConfig.h "$(RM)" $(RM_OPTS) libraries/process/include/HsProcessConfig.h |