Horton

Re: [RFC] building postgres with meson

Andres Freund <andres@anarazel.de>

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From: Andres Freund <andres@anarazel.de>
To: Tom Lane <tgl@sss.pgh.pa.us>, Peter Eisentraut <peter_e@gmx.net>
Cc: Thomas Munro <thomas.munro@gmail.com>, John Naylor <john.naylor@enterprisedb.com>, pgsql-hackers <pgsql-hackers@postgresql.org>
Date: 2021-10-15T18:50:30Z
Lists: pgsql-hackers 
Hi,

On 2021-10-14 19:23:58 -0400, Tom Lane wrote:
> Andres Freund <andres@anarazel.de> writes:
> > If, and perhaps that's too big an if, relative rpaths actually work despite
> > SIP, it might be worth setting a relative install_rpath, because afaict that
> > should then work both for a "real" installation and our temporary test one.
> 
> From what we know so far, it seems like SIP wouldn't interfere with
> that (if it works at all).  I think what SIP desires to prevent is
> messing with a program's execution by setting DYLD_LIBRARY_PATH.
> As long as the program executable itself is saying where to find
> the library, I don't see why they should interfere with that.

Well, there's *some* danger with relative rpaths, because they might
accidentally be pointing somewhere non-existing and user-creatable. Not a huge
risk, but as you say:

> (Again, it seems blindingly stupid to forbid this while not blocking
> PATH or any of the other environment variables that have always affected
> execution.  But what do I know.)

these aren't necessarily carefuly weighed considerations :/

But it seems to work well from what I gather.


> > If absolute rpaths are required, it'd make the process a bit more expensive,
> 
> It'd also put the kibosh on relocatable install trees, though I dunno how
> much people really care about that.

We currently use absolute rpaths, or something equivalent.

The reason that running tests on macos works is that we set the "install_name"
of shared libraries to the intended installed location, using an absolute
path:
    LINK.shared		= $(COMPILER) -dynamiclib -install_name '$(libdir)/lib$(NAME).$(SO_MAJOR_VERSION)$(DLSUFFIX)' $(version_link) $(exported_symbols_list) -multiply_defined suppress
which on macos means that all libraries linking to that dylib reference it
under that absolute path.

On most other platforms we set an absolute rpath to the installation
directory, which has an equivalent effect:
rpathdir = $(libdir)


It seems to work quite well to change our own references to libpq in binaries
/ shared libs to be relative, but to leave the install_name of the libraries
intact. In combination with adding an rpath of @loader_path/../lib/ to
binaries and @loader_path/ to shlibs, the install will re relocatable.

It doesn't work as well to actually have a non-absolute install_name for
libraries (e.g. @rpath/libpq.dylib), because then external code linking to
libpq needs to add an rpath to the installation to make it work.

The advantage of this approach over Peter's is that it's not temp-install
specific - due to the relative paths, it makes installations relocatable
without relying [DY]LD_LIBRARY_PATH.

On other unixoid systems this whole mess is simpler, because we can just add
$ORIGIN to shared libraries and $ORIGIN/../lib/ to binaries. We don't need to
leave some absolute path in the libraries themself intact.

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