$NetBSD: patch-CMakeLists.txt,v 1.4 2023/11/08 09:10:30 nros Exp $

Enable c++ extensions for alloca on NetBSD

--- CMakeLists.txt.orig	2023-07-05 21:00:26.000000000 +0000
+++ CMakeLists.txt
@@ -1010,6 +1010,7 @@ set(EXETYPE "")
 
 # C/C++ flags
 set(PLATFORM_CFLAGS)
+set(PLATFORM_CXXFLAGS)
 
 # these are added to later on.
 set(C_WARNINGS)
@@ -1707,7 +1708,8 @@ set(CMAKE_CXX_STANDARD 17)
 # If C++17 is not available, downgrading to an earlier standard is NOT OK.
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 # Do not enable compiler specific language extensions.
-set(CMAKE_CXX_EXTENSIONS OFF)
+# Sorry needed for alloca on NetBSD
+set(CMAKE_CXX_EXTENSIONS ON)
 
 # Make MSVC properly report the value of the __cplusplus preprocessor macro
 # Available MSVC 15.7 (1914) and up, without this it reports 199711L regardless
@@ -1768,7 +1770,7 @@ endif()
 # Include warnings first, so its possible to disable them with user defined flags
 # eg: -Wno-uninitialized
 set(CMAKE_C_FLAGS "${C_WARNINGS} ${CMAKE_C_FLAGS} ${PLATFORM_CFLAGS}")
-set(CMAKE_CXX_FLAGS "${CXX_WARNINGS} ${CMAKE_CXX_FLAGS} ${PLATFORM_CFLAGS}")
+set(CMAKE_CXX_FLAGS "${CXX_WARNINGS} ${CMAKE_CXX_FLAGS} ${PLATFORM_CFLAGS} ${PLATFORM_CXXFLAGS}")
 
 # defined above, platform specific but shared names
 mark_as_advanced(