When I compile Wine with MinGW, the first error I get is in dlls/dbghelp/source.c. Yet it seems to me that there is no fundamental reason that would prevent dbghelp from working on Windows (i.e. it's not in the 'ntdll' category).
So the error is that although MinGW does not have regex.h and HAVE_REGEX_H is not set, we still use regex_t in many places and call the corresponding functions: regcomp(), regexec() and regfree().
So how should we handle this?
1) #ifdef-out regexp support if regex.h is missing? Maybe with an autoconf check for regcomp()? 2) Add some reg*() stubs that do nothing if regex.h & co are missing? 3) Use some Windows API that provides regular expression support? Is there one? Is it implemented already? 4) Reimplement regular expression support straight in dbghelp? Maybe by importing some c files from another project with a compatible license?