crosstool-ng-1.15.2: broken with older flex versions

[Thomas De Schampheleire <patrickdepinguin+buildroot at gmail dot com>]

[Please keep me in copy]

Hi,

In flex 2.5.4 (unfortunately still shipped with CentOS 5.8) and
possibly newer versions as well, the -o and -P (and possibly other)
options require that there is no whitespace between the option and its
argument.
This causes the following line from kconfig/Makefile to break:

lex.zconf.c: zconf.l
        @echo "  LEX    '$@'"
        @flex -L -P zconf -o $@ $<

changing this to:

lex.zconf.c: zconf.l
        @echo "  LEX    '$@'"
        @flex -L -Pzconf -o$@ $<

fixes the problem.

Here are the errors otherwise shown:

  GEN    'config/configure.in'
  GEN    'paths.mk'
  GEN    'paths.sh'
  LEX    'lex.zconf.c'
flex: can't open zconf
make[2]: *** [build-lib-kconfig] Error 2
make[1]: *** [build] Error 2
make[1]: Leaving directory
`/repo/central/jenkins/workspace/buildroot-eglibc-toolchain/output/build/host-crosstool-ng-1.15.2'
make: *** [/repo/central/jenkins/workspace/buildroot-eglibc-toolchain/output/build/host-crosstool-ng-1.15.2/.stamp_built]
Error 2

and after fixing the -P problem first;

  GEN    'config/configure.in'
  GEN    'paths.mk'
  GEN    'paths.sh'
  LEX    'lex.zconf.c'
flex: can't open lex.zconf.c
make[2]: *** [build-lib-kconfig] Error 2
make[1]: *** [build] Error 2
make[1]: Leaving directory
`/repo/central/jenkins/workspace/buildroot-eglibc-toolchain/output/build/host-crosstool-ng-1.15.2'
make: *** [/repo/central/jenkins/workspace/buildroot-eglibc-toolchain/output/build/host-crosstool-ng-1.15.2/.stamp_built]
Error 2


This was apparently reported on IRC:
http://crosstool-ng.org/download/ibot-logs/2012-02-18.html
but without reply.

Although the mentioned flex version is very old, I think the change is
not large nor messy so that it can be applied anyway. Especially since
it is still used in CentOS 5 (not sure about version 6, don't have
it).

Best regards,
Thomas

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