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Subject:	Cygwin build error
Date:	Thu, 27 Apr 2006 15:14:59 -0400
Message-ID:	<B6C33E7A8278A0408B707C9B491720D4045321@STEELPO.steeleye.com>
From:	"Ernie Coskrey" <Ernie DOT Coskrey AT steeleye DOT com>
To:	<cygwin AT cygwin DOT com>
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I ran into the following problem building the latest cygwin snapshot:

configure: loading cache .././config.cache
configure: error: `CFLAGS' has changed since the previous run:
configure:   former value:  -O2 -g -O2  
configure:   current value: -O2 -g -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 '../../../../src/newlib/libc/configure' failed for libc

By piping the output to a file, I saw that the former value of CFLAGS is "-O2 -g -O2  " (two spaces), while the current value is "-O2 -g -O2 " (one space).  This causes the comparison in libc/configure to fail.

The way I've resolved this is to replace the following line:

      if test "x$ac_old_val" != "x$ac_new_val"; then

with

      if test "`echo $ac_old_val`" != "`echo $ac_new_val`"; then

wherever it appears in any "configure" script (there are 75 configure scripts that contain this test, BTW).  There may be a more elegant way around this, but I haven't found it.  Running "make distclean" or removing config.cache doesn't resolve the problem.

-----
Ernie Coskrey       SteelEye Technology, Inc.    803-461-3875

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