From 4e21a26db24cfeb0c8a3ba43dba2d7d5599d2ee5 Mon Sep 17 00:00:00 2001
From: Calvin Buckley <calvin@cmpct.info>
Date: Fri, 10 May 2024 14:20:17 -0300
Subject: [PATCH] Fix check for newer versions of ICU (#14186)

From cc46a4e6b5a413bab3e264c1dcaaf7052f54fbc4 Mon Sep 17 00:00:00 2001
From: David Carlier <devnexen@gmail.com>
Date: Sat, 17 Feb 2024 21:38:21 +0000
Subject: [PATCH] ext/intl: level up c++ runtime std for icu 74 and onwards.

Index: ext/intl/config.m4
--- ext/intl/config.m4.orig
+++ ext/intl/config.m4
@@ -85,7 +85,16 @@ if test "$PHP_INTL" != "no"; then
     breakiterator/codepointiterator_methods.cpp"
 
   PHP_REQUIRE_CXX()
-  PHP_CXX_COMPILE_STDCXX(11, mandatory, PHP_INTL_STDCXX)
+
+  AC_MSG_CHECKING([if intl requires -std=gnu++17])
+  AS_IF([$PKG_CONFIG icu-uc --atleast-version=74],[
+    AC_MSG_RESULT([yes])
+    PHP_CXX_COMPILE_STDCXX(17, mandatory, PHP_INTL_STDCXX)
+  ],[
+    AC_MSG_RESULT([no])
+    PHP_CXX_COMPILE_STDCXX(11, mandatory, PHP_INTL_STDCXX)
+  ])
+
   PHP_INTL_CXX_FLAGS="$INTL_COMMON_FLAGS $PHP_INTL_STDCXX $ICU_CXXFLAGS"
   case $host_alias in
   *cygwin*) PHP_INTL_CXX_FLAGS="$PHP_INTL_CXX_FLAGS -D_POSIX_C_SOURCE=200809L"
