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For PR619: 

Make any header files that are automatically generated be preconditions of
the compilation. This ensures that if a *.h.in file is changed then its
corresponding *.h file gets updated on the next rebuild. Note that this can
lead to confusing (but correct) results if the *.h.in file changed
unsubstantially so that autoheader doesn't update the *.h file. In that case,
manually touch the *.h file in question to restore order. Moral of the story,
if you're going to "touch" a *.in file then modify it substantially.

llvm-svn: 23006
This commit is contained in:
Reid Spencer 2005-08-24 10:43:10 +00:00
parent f85fabeb71
commit b48e3f8b74
2 changed files with 20 additions and 0 deletions
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16
llvm/Makefile.rules
View File

@ -28,6 +28,13 @@ TopLevelTargets := check dist dist-check dist-clean tags dist-gzip dist-bzip2 \
UserTargets := $(RecursiveTargets) $(LocalTargets) $(TopLevelTargets)
InternalTargets := preconditions distdir dist-hook
FilesToConfig := \
include/llvm/Config/config.h \
include/llvm/Support/DataTypes.h \
include/llvm/ADT/hash_map \
include/llvm/ADT/hash_set \
include/llvm/ADT/iterator
################################################################################
# INITIALIZATION: Basic things the makefile needs
################################################################################
@ -77,6 +84,9 @@ ifneq ($(MakefileConfigIn),)
PreConditions += $(MakefileConfig)
endif
FilesToConfigPATH := $(addprefix $(PROJ_OBJ_ROOT)/,$(FilesToConfig))
PreConditions += $(FilesToConfigPATH)
preconditions : $(PreConditions)
#------------------------------------------------------------------------
@ -134,6 +144,11 @@ $(ConfigStatusScript): $(ConfigureScript)
$(ConfigStatusScript) --recheck $(ConfigureScriptFLAGS) && \
$(ConfigStatusScript)
.PRECIOUS: $(FilesToConfigPATH)
$(FilesToConfigPATH) : $(PROJ_OBJ_ROOT)/% : $(PROJ_SRC_ROOT)/%.in
$(Echo) Regenerating $*
$(Verb) cd $(PROJ_OBJ_ROOT) && $(ConfigStatusScript) $*
#------------------------------------------------------------------------
# Make sure the configuration makefile is up to date
#------------------------------------------------------------------------
@ -1576,3 +1591,4 @@ printvars::
$(Echo) "YaccFiles : " '$(YaccFiles)'
$(Echo) "LexFiles : " '$(LexFiles)'
$(Echo) "Module : " '$(Module)'
$(Echo) "FilesToConfig: " '$(FilesToConfigPATH)'

4
llvm/autoconf/configure.ac
View File

@ -634,6 +634,10 @@ dnl===
dnl===-----------------------------------------------------------------------===
dnl Configure header files
dnl WARNING: dnl If you add or remove any of the following config headers, then
dnl you MUST also update Makefile.rules so that the variable FilesToConfig
dnl contains the same list of files as AC_CONFIG_HEADERS below. This ensures the
dnl files can be updated automatically when their *.in sources change.
AC_CONFIG_HEADERS([include/llvm/Config/config.h])
AC_CONFIG_HEADERS([include/llvm/Support/DataTypes.h])
AC_CONFIG_HEADERS([include/llvm/ADT/hash_map])