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From: Tom de Vries <tdevries@suse.de>
To: gdb-patches@sourceware.org
Subject: [PATCH] [gdb/testsuite] Fix pi approximation
Date: Mon, 26 Jan 2026 13:41:12 +0100	[thread overview]
Message-ID: <20260126124112.1400069-1-tdevries@suse.de> (raw)

In gdb.dap/ada-non-ascii/prog.adb, I came across the following:
...
   π : Integer := 3;            --  The Indiana Approximation.
...

This article [1] explains the background behind the comment: the Indiana pi
bill.

Given that the common interpretation seems to be that the bill implies that
π == 3.2 [2]:
...
The bill ... has been claimed to imply a number of different values for π,
although the closest it comes to explicitly asserting one is the wording "the
ratio of the diameter and circumference is as five-fourths to four", which
would make π = 16⁄5 = 3.2, ... .
...
change the type to float, and set it to 3.2.

Luckily, in this particular case, changing the approximation of π has no
effect, so the test-case still passes :) .

Tested on x86_64-linux.

[1] https://en.wikipedia.org/wiki/Indiana_pi_bill
[2] https://en.wikipedia.org/wiki/Approximations_of_pi#Indiana_bill
---
 gdb/testsuite/gdb.dap/ada-non-ascii/prog.adb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gdb/testsuite/gdb.dap/ada-non-ascii/prog.adb b/gdb/testsuite/gdb.dap/ada-non-ascii/prog.adb
index 7853be5eff8..b2885b3759e 100644
--- a/gdb/testsuite/gdb.dap/ada-non-ascii/prog.adb
+++ b/gdb/testsuite/gdb.dap/ada-non-ascii/prog.adb
@@ -16,7 +16,7 @@
 with Pack; use Pack;
 
 procedure Prog is
-   π : Integer := 3;            --  The Indiana Approximation.
+   π : Float := 3.2;            --  The Indiana Approximation.
    φ : constant := 7;           --  Not even close.
 begin
    Do_Nothing (π'Address);      --  BREAK

base-commit: 449035c35f2169e0c690d83f28306275ab7f7463
-- 
2.51.0


             reply	other threads:[~2026-01-26 12:41 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-01-26 12:41 Tom de Vries [this message]
2026-02-02 17:29 ` Kevin Buettner

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