Module Name: src
Committed By: uebayasi
Date: Fri Dec 11 08:37:34 UTC 2009
Modified Files:
src/share/mk: bsd.own.mk
Log Message:
${GENCMD} is used to generate only one output from file generation commands
which potentially have multiple output files, which confuses make(1).
This wrapper copies all involved files into /tmp, execute the command, and
copy the wanted file back to ${.OBJDIR}. If this is expensive, consider to
rewrite the generation command to output files individually.
XXX bsd.own.mk is too bloated.
To generate a diff of this commit:
cvs rdiff -u -r1.603 -r1.604 src/share/mk/bsd.own.mk
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/share/mk/bsd.own.mk
diff -u src/share/mk/bsd.own.mk:1.603 src/share/mk/bsd.own.mk:1.604
--- src/share/mk/bsd.own.mk:1.603 Sun Dec 6 16:15:15 2009
+++ src/share/mk/bsd.own.mk Fri Dec 11 08:37:34 2009
@@ -1,4 +1,4 @@
-# $NetBSD: bsd.own.mk,v 1.603 2009/12/06 16:15:15 uebayasi Exp $
+# $NetBSD: bsd.own.mk,v 1.604 2009/12/11 08:37:34 uebayasi Exp $
.if !defined(_BSD_OWN_MK_)
_BSD_OWN_MK_=1
@@ -977,6 +977,28 @@
_makedirtarget
#
+# ${GENCMD} <generated name> <command and arguments>
+# Extract only one output from generation command so that make rule is
+# written straight and avoid race (duplicate generation). <generated
+# name> is usually ${.TARGET}; if you want foo.c from foo.y, yacc
+# generates y.tab.c, so <generated name> is y.tab.c. See bin/sh/Makefile
+# for examples.
+#
+GENCMD=\
+ @_gencmd() { \
+ local _dst="$$1"; shift; local _src="$$1"; shift; local _gen="$$1"; shift; \
+ local _tmp=$$( ${TOOL_MKTEMP} -d /tmp/XXXXXX ); \
+ local _opwd=$$PWD; \
+ local _exit; \
+ cp $$_src $$_tmp; \
+ { cd $$_tmp && eval $$@; _exit=$$?; cd $$_opwd; }; \
+ [ $$_exit = 0 ] && cp $${_tmp}/$${_gen} $$_dst; \
+ rm -fr $$_tmp; \
+ return $$_exit; \
+ }; \
+ _gencmd "${.TARGET}" "${.ALLSRC}"
+
+#
# MAKEVERBOSE support. Levels are:
# 0 Minimal output ("quiet")
# 1 Describe what is occurring
