# HG changeset patch
# User Markus Mützel <markus.muetzel@gmx.de>
# Date 1712947995 -7200
# Node ID 899b5fb309ee1e6089a33d542236707b5a87f7e2
# Parent  79cfa1b7a81320da3eb3f12d9d8158c6da46c92e
build: Use C++17 for compiling build tools when cross compiling.

* configure.ac (BUILD_CXX, BUILD_CXXFLAGS): We are requiring a C++17 compiler
to build Octave. Also use C++17 when building (native) build tools while
cross-compiling. Allow GNU extensions for those build tools. Add the "-std"
flag to BUILD_CXX instead of BUILD_CXXFLAGS to mirror what is done for native
builds.

diff -r 79cfa1b7a813 -r 899b5fb309ee configure.ac
--- a/configure.ac	Fri Apr 12 11:15:32 2024 -0400
+++ b/configure.ac	Fri Apr 12 20:53:15 2024 +0200
@@ -1011,8 +1011,8 @@
 if test "$cross_compiling" = yes; then
   BUILD_CC="gcc"
   BUILD_CFLAGS="-O2 -g"
-  BUILD_CXX="g++"
-  BUILD_CXXFLAGS="-O2 -g -std=c++11"
+  BUILD_CXX="g++ -std=gnu++17"
+  BUILD_CXXFLAGS="-O2 -g"
   BUILD_LDFLAGS=""
   BUILD_EXEEXT=""
 else