From 7b76d6bf221071d733a63cb65a616ec9f8fc4b92 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=C3=86var=20Arnfj=C3=B6r=C3=B0=20Bjarmason?= Date: Tue, 29 Jun 2021 10:44:50 +0200 Subject: [PATCH] Makefile: add and use the ".DELETE_ON_ERROR" flag MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Use the GNU make ".DELETE_ON_ERROR" flag in our main Makefile, as we already do in the Documentation/Makefile since db10fc6c09f (doc: simplify Makefile using .DELETE_ON_ERROR, 2021-05-21). Now if a command to make X fails X will be removed, the default behavior of GNU make is to only do so if "make" itself is interrupted with a signal. E.g. if we now intentionally break one of the rules with: - mv $@+ $@ + mv $@+ $@ && \ + false We'll get output like: $ make git CC git.o LINK git make: *** [Makefile:2179: git] Error 1 make: *** Deleting file 'git' $ file git git: cannot open `git' (No such file or directory) Before this change we'd leave the file in place in under this scenario. As in db10fc6c09f this allows us to remove patterns of removing leftover $@ files at the start of rules, since previous failing runs of the Makefile won't have left those littered around anymore. I'm not as confident that we should be replacing the "mv $@+ $@" pattern entirely, since that means that external programs or one of our other Makefiles might race and get partial content. I'm not changing $(REMOTE_CURL_ALIASES) since that uses a ln/ln -s/cp dance, and would require the addition of "-f" flags if the "rm" at the start was removed. I've also got plans to fix that ln/ln -s/cp pattern in another series. For $(LIB_FILE) and $(XDIFF_LIB) we can rely on the "c" (create) being present in ARFLAGS. I'm not changing "$(ETAGS_TARGET)", "tags" and "cscope" because they've got a messy combination of removing "$@+" not "$@" at the beginning, or "$@*". I'm also addressing those in another series. Signed-off-by: Ævar Arnfjörð Bjarmason Signed-off-by: Junio C Hamano --- Makefile | 29 ++++++++++++++++++----------- 1 file changed, 18 insertions(+), 11 deletions(-) diff --git a/Makefile b/Makefile index c3565fc0f8..157293b555 100644 --- a/Makefile +++ b/Makefile @@ -2160,6 +2160,16 @@ shell_compatibility_test: please_set_SHELL_PATH_to_a_more_modern_shell strip: $(PROGRAMS) git$X $(STRIP) $(STRIP_OPTS) $^ +### Flags affecting all rules + +# A GNU make extension since gmake 3.72 (released in late 1994) to +# remove the target of rules if commands in those rules fail. The +# default is to only do that if make itself receives a signal. Affects +# all targets, see: +# +# info make --index-search=.DELETE_ON_ERROR +.DELETE_ON_ERROR: + ### Target-specific flags and dependencies # The generic compilation pattern rule and automatically @@ -2243,7 +2253,6 @@ SCRIPT_DEFINES = $(SHELL_PATH_SQ):$(DIFF_SQ):$(GIT_VERSION):\ $(gitwebdir_SQ):$(PERL_PATH_SQ):$(SANE_TEXT_GREP):$(PAGER_ENV):\ $(perllibdir_SQ) define cmd_munge_script -$(RM) $@ $@+ && \ sed -e '1s|#!.*/sh|#!$(SHELL_PATH_SQ)|' \ -e 's|@SHELL_PATH@|$(SHELL_PATH_SQ)|' \ -e 's|@@DIFF@@|$(DIFF_SQ)|' \ @@ -2313,7 +2322,7 @@ endif PERL_DEFINES += $(gitexecdir) $(perllibdir) $(localedir) $(SCRIPT_PERL_GEN): % : %.perl GIT-PERL-DEFINES GIT-PERL-HEADER GIT-VERSION-FILE - $(QUIET_GEN)$(RM) $@ $@+ && \ + $(QUIET_GEN) \ sed -e '1{' \ -e ' s|#!.*perl|#!$(PERL_PATH_SQ)|' \ -e ' r GIT-PERL-HEADER' \ @@ -2333,7 +2342,7 @@ GIT-PERL-DEFINES: FORCE fi GIT-PERL-HEADER: $(PERL_HEADER_TEMPLATE) GIT-PERL-DEFINES Makefile - $(QUIET_GEN)$(RM) $@ && \ + $(QUIET_GEN) \ INSTLIBDIR='$(perllibdir_SQ)' && \ INSTLIBDIR_EXTRA='$(PERLLIB_EXTRA_SQ)' && \ INSTLIBDIR="$$INSTLIBDIR$${INSTLIBDIR_EXTRA:+:$$INSTLIBDIR_EXTRA}" && \ @@ -2359,7 +2368,7 @@ git-instaweb: git-instaweb.sh GIT-SCRIPT-DEFINES mv $@+ $@ else # NO_PERL $(SCRIPT_PERL_GEN) git-instaweb: % : unimplemented.sh - $(QUIET_GEN)$(RM) $@ $@+ && \ + $(QUIET_GEN) \ sed -e '1s|#!.*/sh|#!$(SHELL_PATH_SQ)|' \ -e 's|@@REASON@@|NO_PERL=$(NO_PERL)|g' \ unimplemented.sh >$@+ && \ @@ -2373,14 +2382,14 @@ $(SCRIPT_PYTHON_GEN): GIT-BUILD-OPTIONS ifndef NO_PYTHON $(SCRIPT_PYTHON_GEN): GIT-CFLAGS GIT-PREFIX GIT-PYTHON-VARS $(SCRIPT_PYTHON_GEN): % : %.py - $(QUIET_GEN)$(RM) $@ $@+ && \ + $(QUIET_GEN) \ sed -e '1s|#!.*python|#!$(PYTHON_PATH_SQ)|' \ $< >$@+ && \ chmod +x $@+ && \ mv $@+ $@ else # NO_PYTHON $(SCRIPT_PYTHON_GEN): % : unimplemented.sh - $(QUIET_GEN)$(RM) $@ $@+ && \ + $(QUIET_GEN) \ sed -e '1s|#!.*/sh|#!$(SHELL_PATH_SQ)|' \ -e 's|@@REASON@@|NO_PYTHON=$(NO_PYTHON)|g' \ unimplemented.sh >$@+ && \ @@ -2388,8 +2397,7 @@ $(SCRIPT_PYTHON_GEN): % : unimplemented.sh mv $@+ $@ endif # NO_PYTHON -CONFIGURE_RECIPE = $(RM) configure configure.ac+ && \ - sed -e 's/@@GIT_VERSION@@/$(GIT_VERSION)/g' \ +CONFIGURE_RECIPE = sed -e 's/@@GIT_VERSION@@/$(GIT_VERSION)/g' \ configure.ac >configure.ac+ && \ autoconf -o configure configure.ac+ && \ $(RM) configure.ac+ @@ -2514,7 +2522,6 @@ endif ifeq ($(GENERATE_COMPILATION_DATABASE),yes) all:: compile_commands.json compile_commands.json: - @$(RM) $@ $(QUIET_GEN)sed -e '1s/^/[/' -e '$$s/,$$/]/' $(compdb_dir)/*.o.json > $@+ @if test -s $@+; then mv $@+ $@; else $(RM) $@+; fi endif @@ -2587,10 +2594,10 @@ $(REMOTE_CURL_PRIMARY): remote-curl.o http.o http-walker.o GIT-LDFLAGS $(GITLIBS $(CURL_LIBCURL) $(EXPAT_LIBEXPAT) $(LIBS) $(LIB_FILE): $(LIB_OBJS) - $(QUIET_AR)$(RM) $@ && $(AR) $(ARFLAGS) $@ $^ + $(QUIET_AR)$(AR) $(ARFLAGS) $@ $^ $(XDIFF_LIB): $(XDIFF_OBJS) - $(QUIET_AR)$(RM) $@ && $(AR) $(ARFLAGS) $@ $^ + $(QUIET_AR)$(AR) $(ARFLAGS) $@ $^ export DEFAULT_EDITOR DEFAULT_PAGER