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diff '--color=auto' -aurN a/ext/intl/config.m4 b/ext/intl/config.m4
--- a/ext/intl/config.m4 2024-07-17 18:54:08.645892664 -0400
+++ b/ext/intl/config.m4 2024-07-17 18:54:29.506419432 -0400
@@ -85,7 +85,16 @@
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"
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