From f376d04dc81695c3fff621eb3ec50c16937932e7 Mon Sep 17 00:00:00 2001
From: acarioni <alessandro.carioni@lightstreamer.com>
Date: Tue, 25 Jun 2024 11:30:49 +0200
Subject: [PATCH] add compiler flag to enable c++17 support (#1116)

---
 toolchain/linux-toolchain.xml | 3 ++-
 toolchain/mac-toolchain.xml   | 8 +++++---
 toolchain/msvc-toolchain.xml  | 1 +
 3 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/toolchain/linux-toolchain.xml b/toolchain/linux-toolchain.xml
index dd7271c65..ed0880532 100644
--- a/toolchain/linux-toolchain.xml
+++ b/toolchain/linux-toolchain.xml
@@ -26,7 +26,7 @@
    </section>
 </section>
 
-<set name="HXCPP_CPP11" value="1" unless="HXCPP_NO_CPP11" />
+<set name="HXCPP_CPP11" value="1" unless="HXCPP_NO_CPP11 || HXCPP_CPP17" />
 
 <include name="toolchain/gcc-toolchain.xml"/>
 <set name="noM32" value="1" if="HXCPP_NO_M32" />
@@ -41,6 +41,7 @@
   <flag value="-fvisibility=hidden"/>
   <cppflag value="-frtti"/>
   <cppflag value="-std=c++11" if="HXCPP_CPP11" />
+  <cppflag value="-std=c++17" if="HXCPP_CPP17"/>
   <flag value="-g" if="debug"/>
   <flag value="-O2" unless="debug"/>
   <flag value="-fpic"/>
diff --git a/toolchain/mac-toolchain.xml b/toolchain/mac-toolchain.xml
index 907c2270a..c8e0f760d 100644
--- a/toolchain/mac-toolchain.xml
+++ b/toolchain/mac-toolchain.xml
@@ -2,17 +2,17 @@
 <!-- MACOS TOOLS -->
 
 <set name="HXCPP_USE_LIBTOOL" value="1" />
-<set name="HXCPP_CPP11" value="1" unless="HXCPP_NO_CPP11 || HXCPP_CPP14" />
+<set name="HXCPP_CPP11" value="1" unless="HXCPP_NO_CPP11 || HXCPP_CPP14 || HXCPP_CPP17" />
 
 
 <include name="toolchain/gcc-toolchain.xml"/>
-<setenv name="MACOSX_DEPLOYMENT_TARGET" value="10.9" if="HXCPP_CPP11||HXCPP_CPP14" unless="MACOSX_DEPLOYMENT_TARGET"/>
+<setenv name="MACOSX_DEPLOYMENT_TARGET" value="10.9" if="HXCPP_CPP11||HXCPP_CPP14||HXCPP_CPP17" unless="MACOSX_DEPLOYMENT_TARGET"/>
 <setenv name="MACOSX_DEPLOYMENT_TARGET" value="10.7" if="OBJC_ARC" unless="MACOSX_DEPLOYMENT_TARGET" />
 <setenv name="MACOSX_DEPLOYMENT_TARGET" value="10.6" unless="MACOSX_DEPLOYMENT_TARGET" />
 <path name="${DEVELOPER_DIR}/usr/bin" />
 <set name="HXCPP_LTO_THIN" value="1" if="HXCPP_OPTIMIZE_LINK_INCREMENTAL"/>
 
-<set name="STDLIBCPP" value="1" unless="HXCPP_GCC || HXCPP_CPP11 || HXCPP_CPP14" />
+<set name="STDLIBCPP" value="1" unless="HXCPP_GCC || HXCPP_CPP11 || HXCPP_CPP14 || HXCPP_CPP17" />
 
 
 <section unless="HXCPP_ARCH">
@@ -29,6 +29,8 @@
   <cppflag value="-std=c++11" if="HXCPP_CPP11"/>
   <cppflag value="-std=c++14" if="HXCPP_CPP14"/>
   <cppflag value="-Wc++14-extensions" if="HXCPP_CPP14"/>
+  <cppflag value="-std=c++17" if="HXCPP_CPP17"/>
+  <cppflag value="-Wc++17-extensions" if="HXCPP_CPP17"/>
   <flag value="-stdlib=libc++" unless="STDLIBCPP" />
   <flag value="-stdlib=libstdc++" if="STDLIBCPP" />
   <cppflag value="-frtti"/>
diff --git a/toolchain/msvc-toolchain.xml b/toolchain/msvc-toolchain.xml
index 6a041a99c..26c7a826c 100644
--- a/toolchain/msvc-toolchain.xml
+++ b/toolchain/msvc-toolchain.xml
@@ -69,6 +69,7 @@
   <flag value="-DHXCPP_BIG_ENDIAN" if="HXCPP_BIG_ENDIAN"/>
   <flag value="-D${HXCPP_XP_DEFINE}" if="HXCPP_XP_DEFINE"/>
   <flag value="-GR"/>
+  <flag value="/std:c++17" if="HXCPP_CPP17"/>
 
   <!-- standard optimization flags -->
   <flag value="-Od" if="debug" tag="optim-std" />