remove dependency on existing /usr/include/gnu/stubs.h

[Pete Wyckoff <pw at osc dot edu>]

>Submitter-Id:	net
>Originator:	Pete Wyckoff
>Organization:
>Confidential:	no
>Synopsis:	make fails if /usr/include/gnu/stubs.h does not exist
>Severity:	non-critical
>Priority:	low
>Category:	libc
>Class:		sw-bug
>Release:	libc-2.1.95
>Environment:
Host type: i686-pc-linux-gnu
System: Linux bigger 2.4.0-test9 #4 SMP Sat Oct 7 14:58:52 EDT 2000 i686 unknown
Architecture: i686

Addons: linuxthreads

Build CC: gcc
Compiler version: 2.95.2 19991024 (release)
Kernel headers: 2.4.0-test9
Symbol versioning: yes
Build static: yes
Build shared: yes
Build pic-default: no
Build profile: yes
Build omitfp: no
Build bounded: no
Build static-nss: no
Stdio: libio

>Description:
	Dependency file bits/stdio_lim.d insists that bits/stdio_lim.st
	depends on /usr/include/gnu/stubs.h.

>How-To-Repeat:
	mkdir /tmp/build
	cd /tmp/build
	./configure ....
	make
	mv /usr/include /far/away
	mkdir /usr/include
	ln -s /usr/src/linux/include/linux /usr/include/linux
	ln -s /usr/src/linux/include/asm /usr/include/asm
	make install

	Error is:
	make[2]: Entering directory `/usr/src/glibc-2.1.95/csu'
	make[2]: *** No rule to make target `/usr/include/gnu/stubs.h', needed by `/tmp/build/bits/stdio_lim.st'.  Stop.
	make[2]: Leaving directory `/usr/src/glibc-2.1.95/csu'

	Note:  if you wipe /usr/include before starting the build, a complaint
	during dependency generation spins by, but doesn't stop the build:
	  In file included from ../misc/sys/uio.h:22,
	    from :1:
	    ../include/features.h:311: gnu/stubs.h: No such file or directory
	(Of course, in this scenario, make check will then fail in a few
	cases later due to $(native-compile) not having a working
	/usr/include.)


>Fix:
	Arrange for _LIBC to be defined somehow during the generation of
	bits/stdio_lim.d.  That file is special and handled by explicit code
	toward the end of Rules.  A minimalist patch follows, but you may
	want to pull in include/libc-symbols.h as is done for all other
	dependency generation.

2000-10-15  Pete Wyckoff  <pw@osc.edu>
	* Rules: Define _LIBC during generation of bits/stdio_lim.d.
	
diff -ruN glibc-2.1.95/Rules glibc/Rules
--- glibc-2.1.95/Rules	Sun Oct 15 14:58:27 2000
+++ glibc/Rules	Sun Oct 15 14:47:15 2000
@@ -206,7 +206,7 @@
 	$(CC) $(+includes) -E -dM -xc - -o $(@:st=hT)
 	echo '#include "$(..)misc/sys/uio.h"' |				\
 	SUNPRO_DEPENDENCIES='$(@:st=dT) $@'				\
-	$(CC) $(+includes) -E -dM -xc - | cat - >> $(@:st=hT)
+	$(CC) -D_LIBC=1 $(+includes) -E -dM -xc - | cat - >> $(@:st=hT)
 ifdef sed-remove-objpfx
 	sed $(sed-remove-objpfx) $(@:st=dT) > $(@:st=dt)
 	cat $(@:st=dt) >> $(@:st=d)