On Mon, Aug 12, 2024 at 11:58 PM Max Krummenacher <max.oss.09@xxxxxxxxx> wrote:
>
> On Sat, Aug 10, 2024 at 01:07:20AM +0900, Masahiro Yamada wrote:
> > Commit 6e20753da6bc ("tty: vt: conmakehash: cope with abs_srctree no
> > longer in env") included <linux/limits.h>, which invoked another
> > (wrong) patch that tried to address a build error on macOS.
> >
> > According to the specification [1], the correct header to use PATH_MAX
> > is <limits.h>.
> >
> > The minimal fix would be to replace <linux/limits.h> with <limits.h>.
> I can change that in a v2.
You cannot.
Your buggy commit already landed in Linus' tree:
https://github.com/torvalds/linux/commit/6e20753da6bc651e02378a0cdb78f16c42098c88
> >
> > However, the following commits seem questionable to me:
> >
> > - 3bd85c6c97b2 ("tty: vt: conmakehash: Don't mention the full path of the input in output")
> > - 6e20753da6bc ("tty: vt: conmakehash: cope with abs_srctree no longer in env")
> >
> > These commits made too many efforts to cope with a comment header in
> > drivers/tty/vt/consolemap_deftbl.c:
> >
> > /*
> > * Do not edit this file; it was automatically generated by
> > *
> > * conmakehash drivers/tty/vt/cp437.uni > [this file]
> > *
> > */
>
> This is the output you get when keeping the build artifacts within the
> linux source tree.
> However if you keep the artifacts outside the source tree
> (make O=/somepath ...) the output looks like this:
>
> /*
> * Do not edit this file; it was automatically generated by
> *
> * conmakehash /path-to-kernel-source-tree/drivers/tty/vt/cp437.uni > [this file]
> *
> */
>
> i.e. it does keep a reference to where in your filesystem the kernel
> source did reside when building which is against the goal of having a
> reproducable build.
You do not need to educate me.
It is well described in commit 3bd85c6c97b2d232638594bf828de62083fe3389
and I know how it works.
> >
> > With this commit, the header part of the generate C file will be
> > simplified as follows:
> >
> > /*
> > * Automatically generated file; Do not edit.
> > */
>
> This is not what I observed, for me with this proposed commit the
> comment becomes with or without the 'O=somepath':
>
> /*
> * Do not edit this file; it was automatically generated by
> *
> * conmakehash cp437.uni > [this file]
> *
> */
>
> i.e. it strips the directory path of the chartable source file used.
See my patch closely.
I deleted the line "* conmakehash %s > [this file]\n\"
> Regards
> Max
>
> >
> > BTW, another series of excessive efforts for a comment header can be
> > seen in the following:
> >
> > - 5ef6dc08cfde ("lib/build_OID_registry: don't mention the full path of the script in output")
> > - 2fe29fe94563 ("lib/build_OID_registry: avoid non-destructive substitution for Perl < 5.13.2 compat")
> >
> > [1]: https://pubs.opengroup.org/onlinepubs/009695399/basedefs/limits.h.html
> >
> > Fixes: 6e20753da6bc ("tty: vt: conmakehash: cope with abs_srctree no longer in env")
> > Reported-by: Daniel Gomez <da.gomez@xxxxxxxxxxx>
> > Closes: https://lore.kernel.org/all/20240807-macos-build-support-v1-11-4cd1ded85694@xxxxxxxxxxx/
> > Signed-off-by: Masahiro Yamada <masahiroy@xxxxxxxxxx>
> > ---
> >
> > drivers/tty/vt/conmakehash.c | 12 ++----------
> > 1 file changed, 2 insertions(+), 10 deletions(-)
> >
> > diff --git a/drivers/tty/vt/conmakehash.c b/drivers/tty/vt/conmakehash.c
> > index 82d9db68b2ce..a931fcde7ad9 100644
> > --- a/drivers/tty/vt/conmakehash.c
> > +++ b/drivers/tty/vt/conmakehash.c
> > @@ -11,8 +11,6 @@
> > * Copyright (C) 1995-1997 H. Peter Anvin
> > */
> >
> > -#include <libgen.h>
> > -#include <linux/limits.h>
> > #include <stdio.h>
> > #include <stdlib.h>
> > #include <sysexits.h>
> > @@ -79,7 +77,6 @@ int main(int argc, char *argv[])
> > {
> > FILE *ctbl;
> > const char *tblname;
> > - char base_tblname[PATH_MAX];
> > char buffer[65536];
> > int fontlen;
> > int i, nuni, nent;
> > @@ -245,20 +242,15 @@ int main(int argc, char *argv[])
> > for ( i = 0 ; i < fontlen ; i++ )
> > nuni += unicount[i];
> >
> > - strncpy(base_tblname, tblname, PATH_MAX);
> > - base_tblname[PATH_MAX - 1] = 0;
> > printf("\
> > /*\n\
> > - * Do not edit this file; it was automatically generated by\n\
> > - *\n\
> > - * conmakehash %s > [this file]\n\
> > - *\n\
> > + * Automatically generated file; Do not edit.\n\
> > */\n\
> > \n\
> > #include <linux/types.h>\n\
> > \n\
> > u8 dfont_unicount[%d] = \n\
> > -{\n\t", basename(base_tblname), fontlen);
> > +{\n\t", fontlen);
> >
> > for ( i = 0 ; i < fontlen ; i++ )
> > {
> > --
> > 2.43.0
> >
--
Best Regards
Masahiro Yamada
