Horton

Re: build remaining Flex files standalone

Andres Freund <andres@anarazel.de>

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From: Andres Freund <andres@anarazel.de>
To: John Naylor <john.naylor@enterprisedb.com>
Cc: Tom Lane <tgl@sss.pgh.pa.us>, PostgreSQL Development <pgsql-hackers@postgresql.org>
Date: 2022-08-17T01:14:31Z
Lists: pgsql-hackers 
Hi,

On 2022-08-16 17:41:43 +0700, John Naylor wrote:
> For v3, I addressed some comments and added .h files to the
> headerscheck exceptions.

Thanks!


> /*
>  * NB: include bootparse.h only AFTER including bootstrap.h, because bootstrap.h
>  * includes node definitions needed for YYSTYPE.
>  */
> 
> Future cleanup: I see this in headerscheck:
> 
> # We can't make these Bison output files compilable standalone
> # without using "%code require", which old Bison versions lack.
> # parser/gram.h will be included by parser/gramparse.h anyway.
> 
> That directive has been supported in Bison since 2.4.2.

2.4.2 is from 2010. So I think we could just start relying on it?


> > > +/* functions shared between guc.c and guc-file.l */
> > > [...]
> > I think I prefer your suggestion of a guc_internal.h upthread.
> 
> Started in 0002, but left open the headerscheck failure.
> 
> Also, if such a thing is meant to be #include'd only by two generated
> files, maybe it should just live in the directory where they live, and
> not in the src/include dir?

It's not something we've done for the backend afaics, but I don't see a reason
not to start at some point.


> > > From 7d4ecfcb3e91f3b45e94b9e64c7c40f1bbd22aa8 Mon Sep 17 00:00:00 2001
> > > From: John Naylor <john.naylor@postgresql.org>
> > > Date: Fri, 12 Aug 2022 15:45:24 +0700
> > > Subject: [PATCH v201 2/9] Build booscanner.c standalone
> >
> > > -# bootscanner is compiled as part of bootparse
> > > -bootparse.o: bootscanner.c
> > > +# See notes in src/backend/parser/Makefile about the following two rules
> > > +bootparse.h: bootparse.c
> > > +     touch $@
> > > +
> > > +bootparse.c: BISONFLAGS += -d
> > > +
> > > +# Force these dependencies to be known even without dependency info built:
> > > +bootparse.o bootscan.o: bootparse.h
> >
> > Wonder if we could / should wrap this is something common. It's somewhat
> > annoying to repeat this stuff everywhere.
> 
> I haven't looked at the Meson effort recently, but if the build rule
> is less annoying there, I'm inclined to leave this as a wart until
> autotools are retired.

The only complicating thing in the rules there is the dependencies from one .c
file to another .c file.


> > > diff --git a/contrib/cube/cubedata.h b/contrib/cube/cubedata.h
> > > index dbe7d4f742..0b373048b5 100644
> > > --- a/contrib/cube/cubedata.h
> > > +++ b/contrib/cube/cubedata.h
> > > @@ -67,3 +67,7 @@ extern void cube_scanner_finish(void);
> > >
> > >  /* in cubeparse.y */
> > >  extern int   cube_yyparse(NDBOX **result);
> > > +
> > > +/* All grammar constructs return strings */
> > > +#define YYSTYPE char *
> >
> > Why does this need to be defined in a semi-public header? If we do this in
> > multiple files we'll end up with the danger of macro redefinition warnings.
> 
> I tried to put all the Flex/Bison stuff in another *_internal header,
> but that breaks the build. Putting just this one symbol in a header is
> silly, but done that way for now. Maybe two copies of the symbol?

The problem is that if it's in a header you can't include another header with
such a define. That's fine if it's a .h that's just intended to be included by
a limited set of files, but for something like a header for a datatype that
might need to be included to e.g. define a PL transform or a new operator or
...  This would be solved by the %code requires thing, right?


Greetings,

Andres Freund

Commits

  1. meson: Add 'running' test setup, as a replacement for installcheck

  2. meson: Add support for building with precompiled headers

  3. windows: Adjust FD_SETSIZE via commandline define

  4. meson: docs: Add xml{lint,proc} wrapper to collect dependencies

  5. meson: ecpg: Split definition of static and shared libraries

  6. windows: Set UMDF_USING_NTSTATUS globally, include ntstatus.h

  7. ci: Add hint about downloadable logs to README

  8. meson: Set up absolute rpaths to libdir

  9. meson: Include CFLAGS/c_args in summary and pg_config output

  10. windows: remove date from version number in win32ver.rc

  11. meson: Add initial version of meson based build system

  12. ci: windows: set error mode to not include SEM_NOGPFAULTERRORBOX

  13. Refactor PG_TEST_EXTRA logic in autoconf build

  14. Split TESTDIR into TESTLOGDIR and TESTDATADIR

  15. Don't hardcode tmp_check/ as test directory for tap tests

  16. Extend gendef.pl in preparation for meson

  17. Include c.h instead of postgres.h in src/port/*p{read,write}*.c

  18. Remove DLLTOOL, DLLWRAP from configure / Makefile.global.in

  19. Run xmllint validation only once

  20. Bump minimum Perl version to 5.14

  21. Move gramparse.h to src/backend/parser

  22. Run perltidy over Catalog.pm

  23. Parse catalog .dat files as a whole when compiling the backend

  24. Build all Flex files standalone

  25. Move private declarations shared between guc.c and guc-file.l to new header

  26. Preparatory refactoring for compiling guc-file.c standalone

  27. Move darwin sysroot determination into separate file

  28. Fix MSVC warning in compat_informix/rnull.pgc

  29. solaris: Use versioning scripts instead of -Bsymbolic

  30. Change shared library installation naming on macOS

  31. regress: allow to specify directory containing expected files, for ecpg

  32. Don't add HAVE_LDAP_H HAVE_WINLDAP_H to pg_config.h

  33. Refactor dtrace postprocessing make rules

  34. Add output directory option to gen_node_support.pl

  35. Add output directory argument to generate-unicode_norm_table.pl

  36. Add output file argument to generate-errcodes.pl

  37. Add output path arg in generate-lwlocknames.pl

  38. Move snowball_create.sql creation into perl file

  39. ecpg: Output dir, source dir, stamp file argument for preproc/*.pl

  40. psql: Output dir and dependency generation for sql_help

  41. Deal with paths containing \ and spaces in basebackup_to_shell tests

  42. Remove LLVM_CONFIG from Makefile.global.in

  43. Make update-unicode target work in vpath builds

  44. Refactor DLSUFFIX handling

  45. ldap tests: Add paths for openbsd.

  46. ldap tests: Don't run on unsupported operating systems.

  47. Remove check for accept() argument types

  48. Move our p{read,write}v replacements into their own files.

  49. Adjust yywrap macro for non-reentrant scanners for MSVC.

  50. Remove any -arch switches given in ExtUtils::Embed's ldopts from our

  51. Change PL/Perl and Pg interface build to use configured compiler and

  52. Apparently, on some systems, ExtUtils::Embed and MakeMaker are slightly