From: Jordan Williams <jordan@jwillikers.com>
Date: Fri, 29 Mar 2024 19:00:01 +0000 (-0500)
Subject: meson: Fix false positive detection of mempcpy on macOS
X-Git-Tag: v2.42-start~459^2
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2c5a42b3cbf278461a12872ce7a944ad396d47b5;p=thirdparty%2Futil-linux.git

meson: Fix false positive detection of mempcpy on macOS

The has_function check incorrectly detects mempcpy on macOS.
This function is not available on macOS and should not be detected.
Likely, this has to do with Meson's detection of compiler built-ins.
Using a specific prefix and defining _GNU_SOURCE fixes the detection.

Signed-off-by: Jordan Williams <jordan@jwillikers.com>
---

diff --git a/meson.build b/meson.build
index 9600ce49f..1ec913d7b 100644
--- a/meson.build
+++ b/meson.build
@@ -569,7 +569,6 @@ funcs = '''
         llistxattr
         llseek
         newlocale
-        mempcpy
         mkostemp
         move_mount
         mount_setattr
@@ -634,6 +633,9 @@ foreach func: funcs
   conf.set('HAVE_' + func.to_upper(), have ? 1 : false)
 endforeach
 
+have_mempcpy = cc.has_function('mempcpy', prefix: '#include <string.h>', args: '-D_GNU_SOURCE')
+conf.set('HAVE_MEMPCPY', have_mempcpy ? 1 : false)
+
 have = conf.get('HAVE_FUTIMENS') in [1] and conf.get('HAVE_INOTIFY_INIT1') in [1]
 conf.set('AGETTY_RELOAD', have ? 1 : false)
 if not have