Hi,

The just released meson 1.3 strongly deprecated a hack we were using, emitting
a noisy warning (the hack basically depended on an implementation detail to
work). Turns out there has been a better way available for a while, I just
hadn't found it. 1.4 added a more convenient approach, but we can't rely on
that.

Everything continues to work, but the warning is annoying.

The warning:

Message: checking for file conflicts between source and build directory
../home/andres/src/postgresql/meson.build:2972: DEPRECATION: Project uses 
feature that was always broken, and is now deprecated since '1.3.0': 
str.format: Value other than strings, integers, bools, options, dictionaries 
and lists thereof..
[...]
WARNING: Broken features used:
 * 1.3.0: {'str.format: Value other than strings, integers, bools, options, 
dictionaries and lists thereof.'}

I plan to apply this soon, unless I hear some opposition / better ideas / ....

Greetings,

Andres Freund
>From d296c088ceadeac281a54d6f7f748112c5efb33a Mon Sep 17 00:00:00 2001
From: Andres Freund <and...@anarazel.de>
Date: Wed, 29 Nov 2023 10:47:20 -0800
Subject: [PATCH v1] meson: Stop using deprecated way getting path of files

The just released meson 1.3 strongly deprecated a hack we were using, emitting
a noisy warning (the hack basically depended on an implementation detail to
work). Turns out there has been a better way available for a while, I just
hadn't found it. 1.4 added a more convenient approach, but we can't rely on
that.

Author:
Reviewed-by:
Discussion: https://postgr.es/m/
Backpatch: 16-, where the meson build was added.
---
 meson.build | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/meson.build b/meson.build
index 0095fb183af..d8ff5cb51f0 100644
--- a/meson.build
+++ b/meson.build
@@ -2924,8 +2924,12 @@ potentially_conflicting_files = []
 foreach t : potentially_conflicting_files_t
   potentially_conflicting_files += t.full_path()
 endforeach
-foreach t : configure_files
-  t = '@0@'.format(t)
+foreach t1 : configure_files
+  if meson.version().version_compare('>=0.59')
+    t = fs.parent(t1) / fs.name(t1)
+  else
+    t = '@0@'.format(t1)
+  endif
   potentially_conflicting_files += meson.current_build_dir() / t
 endforeach
 foreach sub, fnames : generated_sources_ac
-- 
2.38.0

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