configure, CFLAGS, and libjava

Sat Nov 13 20:24:00 GMT 2004

We have a bug in our configure mechanism for libjava.
Specifically, when ones sets CFLAGS to "-pipe " (note the trailing blank),
bootstrap fails as follows on i386 GNU/Linux and others:
 Adding multilib support to Makefile in /cvs/gcc/libjava
 multidirs=
 with_multisubdir=
 configure: configuring in libltdl
 configure: running /bin/sh '/cvs/gcc/libjava/libltdl/configure' --prefix=/suse/gp/gcc-i386 '--cache-file=./config.cache' '--host=i686-pc-linux-gnu' '--build=i686-pc-linux-gnu' '--enable-multilib' '--prefix=/suse/gp/gcc-i386' '--with-gcc-version-trigger=/cvs/gcc/gcc/version.c' '--enable-languages=c,c++,java,objc' '--program-transform-name=s,y,y,' '--srcdir=/cvs/gcc/libjava' '--with-target-subdir=i686-pc-linux-gnu' 'CPPFLAGS=-O2 -pipe ' 'build_alias=i686-pc-linux-gnu' 'host_alias=i686-pc-linux-gnu' 'target_alias=i686-pc-linux-gnu' --enable-ltdl-convenience --with-auxdir=/cvs/gcc --cache-file=.././config.cache --srcdir=/cvs/gcc/libjava/libltdl
 configure: loading cache .././config.cache
 configure: error: `CPPFLAGS' has changed since the previous run:
 configure: former value: -O2 -pipe <===
 configure: current value: -O2 -pipe <===
 configure: error: changes in the environment can compromise the build
 configure: error: run `make distclean' and/or `rm .././config.cache' and start over
 configure: error: /bin/sh '/cvs/gcc/libjava/libltdl/configure' failed for libltdl
 gmake[1]: *** [configure-target-libjava] Error 1
 gmake[1]: Leaving directory `/tmp/OBJ-1113-2018'
 gmake: *** [bootstrap-lean] Error 2
Note that "former value" and "current value" above differ by one blank.
I tried to track the source of this difference down but failed so far. Any
concrete hints where to look or, better yet ;-), takers?
Gerald