[PATCH] Fix compile error with flex version 2.5.38 and above

[Bernd Edlinger]

Hello,

I noticed, that bison does no longer compile with flex 2.5.38 and above.

That is because flex 2.5.38 changed the place where the YY_USER_INIT
is evaluated.  Previously it was evaluated after code_start is declared, but
now it is evaluated before code_start is declared:

  CC       src/bison-scan-gram-c.o
In file included from ../bison-3.0.2/src/scan-gram-c.c:3:0:
src/scan-gram.c: In function 'gram_lex':
../bison-3.0.2/src/scan-gram.l:49:4: error: 'code_start' undeclared (first use 
in this function)
    code_start = scanner_cursor = loc->start;            \
  
src/scan-gram.c:1402:3: note: in expansion of macro 'YY_USER_INIT'
   YY_USER_INIT;
   ^
../bison-3.0.2/src/scan-gram.l:49:4: note: each undeclared identifier is 
reported only once for each function it appears in
    code_start = scanner_cursor = loc->start;            \
    ^
src/scan-gram.c:1402:3: note: in expansion of macro 'YY_USER_INIT'
   YY_USER_INIT;
   ^
make[2]: *** [src/bison-scan-gram-c.o] Error 1
make[2]: Leaving directory `/home/ed/gnu/xx'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/home/ed/gnu/xx'
make: *** [all] Fehler 2


To work around this and keep compatible to previous flex versions I would
suggest the attached patch.


Regards,
Bernd Edligner

bison.diff
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