diff options
Diffstat (limited to 'python/Python-parallel-make.patch')
| -rw-r--r-- | python/Python-parallel-make.patch | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/python/Python-parallel-make.patch b/python/Python-parallel-make.patch new file mode 100644 index 000000000000..81ce8dabe35b --- /dev/null +++ b/python/Python-parallel-make.patch @@ -0,0 +1,36 @@ +--- misc/Python-2.6.1/Makefile.pre.in.fix-parallel-make 2010-07-22 15:01:39.567996932 -0400 ++++ misc/build/Python-2.6.1/Makefile.pre.in 2010-07-22 15:47:02.437998509 -0400 +@@ -207,6 +207,7 @@ SIGNAL_OBJS= @SIGNAL_OBJS@ + + ########################################################################## + # Grammar ++GRAMMAR_STAMP= $(srcdir)/grammar-stamp + GRAMMAR_H= $(srcdir)/Include/graminit.h + GRAMMAR_C= $(srcdir)/Python/graminit.c + GRAMMAR_INPUT= $(srcdir)/Grammar/Grammar +@@ -530,10 +531,24 @@ Modules/getpath.o: $(srcdir)/Modules/get + Modules/python.o: $(srcdir)/Modules/python.c + $(MAINCC) -c $(PY_CFLAGS) -o $@ $(srcdir)/Modules/python.c + ++# GNU "make" interprets rules with two dependents as two copies of the rule. ++# ++# In a parallel build this can lead to pgen being run twice, once for each of ++# GRAMMAR_H and GRAMMAR_C, leading to race conditions in which the compiler ++# reads a partially-overwritten copy of one of these files, leading to syntax ++# errors (or linker errors if the fragment happens to be syntactically valid C) ++# ++# See http://www.gnu.org/software/hello/manual/automake/Multiple-Outputs.html ++# for more information ++# ++# Introduce ".grammar-stamp" as a contrived single output from PGEN to avoid ++# this: ++$(GRAMMAR_H) $(GRAMMAR_C): $(GRAMMAR_STAMP) + +-$(GRAMMAR_H) $(GRAMMAR_C): $(PGEN) $(GRAMMAR_INPUT) ++$(GRAMMAR_STAMP): $(PGEN) $(GRAMMAR_INPUT) + -@$(INSTALL) -d Include + -$(PGEN) $(GRAMMAR_INPUT) $(GRAMMAR_H) $(GRAMMAR_C) ++ touch $(GRAMMAR_STAMP) + + $(PGEN): $(PGENOBJS) + $(CC) $(OPT) $(LDFLAGS) $(PGENOBJS) $(LIBS) -o $(PGEN) |