Upstream status: https://github.com/ThrowTheSwitch/Unity/pull/823

From 4d35efd1bc5ecfa67d73bf81e64ba54c08ed5318 Mon Sep 17 00:00:00 2001
From: Dariqq <77271900+Dariqq@users.noreply.github.com>
Date: Tue, 20 Jan 2026 18:10:14 +0000
Subject: [PATCH] meson: Add option for UNITY_SUPPORT_64

---
 meson.build       | 5 +++++
 meson_options.txt | 1 +
 2 files changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 6585129..633beb3 100644
--- a/meson.build
+++ b/meson.build
@@ -26,6 +26,7 @@ project('unity', 'c',
 build_fixture = get_option('extension_fixture')
 build_memory = get_option('extension_memory')
 support_double = get_option('support_double')
+support_int64 = get_option('support_int64')
 
 unity_args = []
 unity_src = []
@@ -48,6 +49,10 @@ if support_double
   unity_args += '-DUNITY_INCLUDE_DOUBLE'
 endif
 
+if support_int64
+  unity_args += '-DUNITY_SUPPORT_64'
+endif
+
 unity_lib = static_library(meson.project_name(),
   sources: unity_src,
   c_args: unity_args,
diff --git a/meson_options.txt b/meson_options.txt
index 8e66784..d8ab7a7 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -1,3 +1,4 @@
 option('extension_fixture', type: 'boolean', value: 'false', description: 'Whether to enable the fixture extension.')
 option('extension_memory', type: 'boolean', value: 'false', description: 'Whether to enable the memory extension.')
 option('support_double', type: 'boolean', value: 'false', description: 'Whether to enable double precision floating point assertions.')
+option('support_int64', type: 'boolean', value: false, description: 'Whether to enable support for 64bit integers. false means autodetect.')
-- 
2.52.0