Re: [Qemu-devel] [Qemu-ppc] [PATCH] PPC: Fail configure when libfdt is not available

[Gerd Hoffmann <kraxel@redhat.com>]

  Hi,

> If there are build problems with libfdt on any platform let me know
> about them.  I would like it to build clean as widely as possible, but
> I don't have that great a diversity of build environments, so I have
> to reply on bug reports.

Fails to build on RHEL-5:

         CC convert-dtsv0-lexer.lex.o
cc1: warnings being treated as errors
convert-dtsv0-lexer.lex.c:693: warning: no previous prototype for ‘yylex’
make: *** [convert-dtsv0-lexer.lex.o] Error 1

Removing -Werror from the Makefile gets me a bit further:

         CC dtc-lexer.lex.o
dtc-lexer.lex.c:683: warning: no previous prototype for ‘yylex’
dtc-lexer.l: In function ‘push_input_file’:
dtc-lexer.l:192: warning: implicit declaration of function
‘yypush_buffer_state’
dtc-lexer.l:192: warning: nested extern declaration of ‘yypush_buffer_state’
dtc-lexer.l: In function ‘pop_input_file’:
dtc-lexer.l:201: warning: implicit declaration of function
‘yypop_buffer_state’
dtc-lexer.l:201: warning: nested extern declaration of ‘yypop_buffer_state’
         CC dtc-parser.tab.o
         LD dtc
dtc-lexer.lex.o: In function `push_input_file':
/home/buildbot/git/dtc/dtc-lexer.l:192: undefined reference to
`yypush_buffer_state'
dtc-lexer.lex.o: In function `pop_input_file':
/home/buildbot/git/dtc/dtc-lexer.l:201: undefined reference to
`yypop_buffer_state'
collect2: ld returned 1 exit status
make: *** [dtc] Error 1

I guess the flex version shipped with RHEL-5 is too old.

$ rpm -qf $(which lex)
flex-2.5.4a-41.fc6

cheers,
  Gerd