On Tue, Dec 10, 2019 at 5:53 PM Sean Conner via cctalk < cctalk@classiccmp.org> wrote:
> It was thus said that the Great David Griffith via cctalk once stated: > > > > I'm trying to convert some C code[1] so it'll compile on TOPS20 with > KCC. > > KCC is mostly ANSI compliant, but it needs to use the TOPS20 linker, > which > > has a limit of six case-insentive characters. Adam Thornton wrote a > Perl > > script[2] that successfully does this for Frotz 2.32. The Frotz > codebase > > has evolved past what was done there and so 2.50 no longer works with > > Adam's script. So I've been expanding that script into something of my > > own, which I call "snavig"[3]. It seems to be gradually working more > and > > more, but I fear the problem is starting to rapidly diverge because it > > still doesn't yield compilable code even on Unix. Does anyone here have > > any knowledge of existing tools or techniques to do what I'm trying to > do? > > If you are doing this on Linux, an approach is to compile the code there, > then run 'nm' over the object files, and it will output something like: > > [spc]lucy:~/source/boston/src>nm main.o > 000000ef t CgiMethod > U CgiNew > 00000000 r __PRETTY_FUNCTION__.21 > U __assert_fail > U crashreport_core > U crashreport_with > U gd > U gf_debug > 00000000 T main > U main_cgi_get > U main_cgi_head > U main_cgi_post > U main_cli > > The last column are identifiers; the second column is the type of > identifier, and the first column is the value. What you want to look for > are types 'T' (externally visible function), 'C' (externally visible > constant data) and 'D' (externally visible data). It is these identifiers > that will need to be six unique characters long. > > Something like: > > [spc]lucy:~/source/boston/src>nm globals.o | grep ' [CDT] ' > 00000041 T GlobalsInit > 00000004 C c_adtag > 00000004 C c_class > 00000004 D c_conversion > 00000004 C c_days > 00000004 C c_tzmin > 00000000 D c_updatetype > 00000004 C c_webdir > 00000008 D cf_emailupdate > 00000004 C g_L > 00000004 C g_blog > 00000004 C g_templates > 00000020 D gd > 00000d09 T set_c_conversion > 00000beb T set_c_updatetype > 00000dbd T set_c_url > 00000cab T set_cf_emailupdate > > (but over all object files). I would then generate unique six character > long identifiers for each of these, and slap the output into a header file > like: > > #define GlobalsInit id0001 > #define c_adtag id0002 > #define c_class id0003 > #define c_conversion id0004 > > and then include this file for every compilation unit. I think that would > be the easiest thing to do. > You'd need to exclude libc symbols, though. In a.out times you could just change the names from old to new and adjust the string table offset to do this :) Warner
