[Bug 42132] New: undefined reference yywrap in winhlp32/ macro.lex.yy.c when building with flex-2.6.3

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=42132

            Bug ID: 42132
           Summary: undefined reference yywrap in winhlp32/macro.lex.yy.c
                    when building with flex-2.6.3
           Product: Wine
           Version: 2.0-rc3
          Hardware: x86
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: -unknown
          Assignee: wine-bugs at winehq.org
          Reporter: nvinson234 at gmail.com
      Distribution: ---

Created attachment 56679
  --> https://bugs.winehq.org/attachment.cgi?id=56679
winhlp32-macro-flex-2.6.3-flex.patch

Flex-2.6.3 uses C preprocessor macros to change the prefix of its functions
from the standard yy to a user-defined one.  This is a change in Flex behavior
and causes wine to fail with any version of Flex newer than 2.6.1.

The failure is caused because programs/winhlp32/macros.lex.l only defines the
yywrap macro if it is not already defined.  The end result is C code that is
looking for an undefined yywrap() function.

I have attached a patch that fixes this issue by removing the yywrap macro
check and definition from macros.lex.l and adding the noyywrap flex option.

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