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Commit5c788e7

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When in automatic dependency mode, never delete any intermediate
files automatically. Otherwise, the following could happen: Whenstarting from a clean source tree, the first build would delete theintermediate file, but also create the dependency file, whichmentions the intermediate file, thus making it non-intermediate.The second build will then need to rebuild the now non-intermediatemissing file. So the second build will do work even though nothinghad changed. One place where this happens is the .c -> .o -> .sochain for some contrib modules.
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‎src/Makefile.global.in‎

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# -*-makefile-*-
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# $PostgreSQL: pgsql/src/Makefile.global.in,v 1.264 2010/07/06 22:03:05 tgl Exp $
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# $PostgreSQL: pgsql/src/Makefile.global.in,v 1.265 2010/08/24 18:06:12 petere Exp $
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#------------------------------------------------------------------------------
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# All PostgreSQL makefiles include this file and use the variables it sets,
@@ -580,6 +580,17 @@ clean distclean maintainer-clean: clean-deps
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clean-deps:
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@rm -rf$(DEPDIR)
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# When in automatic dependency mode, never delete any intermediate
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# files automatically. Otherwise, the following could happen: When
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# starting from a clean source tree, the first build would delete the
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# intermediate file, but also create the dependency file, which
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# mentions the intermediate file, thus making it non-intermediate.
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# The second build will then need to rebuild the now non-intermediate
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# missing file. So the second build will do work even though nothing
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# had changed. One place where this happens is the .c -> .o -> .so
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# chain for some contrib modules.
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.SECONDARY:
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endif# autodepend
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