Trailing spaces in CFLAGS, -C, and AC_CONFIG_SUBDIR

[Joe Orton]

Hi,

If I have a configure script which uses AC_CONFIG_SUBDIR, and invoke
configure passing -C and a CFLAGS value which includes trailing spaces,
configure gets confused:

$ cat configure.in
AC_INIT(bar, 0.2, address@hidden)
AC_PROG_CC
AC_CONFIG_SUBDIRS(foo)
AC_OUTPUT
$ cat foo/configure.in
AC_INIT(foo, 1.0, address@hidden)
AC_MSG_NOTICE([Hello World])
AC_PROG_CC
$ autoreconf
$ ./configure -quiet -C CFLAGS="-O2  "
configure: loading cache ../config.cache
configure: error: `CFLAGS' has changed since the previous run:
configure:   former value:  -O2
configure:   current value: -O2
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 './configure' failed for foo