fix msvc not recognising b_ndebug

fixes #7404

mesonbuild/compilers/cpp.py

@@ -577,7 +577,7 @@ class VisualStudioCPPCompiler(CPP11AsCPP14Mixin, VisualStudioLikeCPPCompilerMixi
                  is_cross: bool, info: 'MachineInfo', exe_wrap, target, **kwargs):
         CPPCompiler.__init__(self, exelist, version, for_machine, is_cross, info, exe_wrap, **kwargs)
         MSVCCompiler.__init__(self, target)
-        self.base_options = ['b_pch', 'b_vscrt'] # FIXME add lto, pgo and the like
+        self.base_options = ['b_pch', 'b_vscrt', 'b_ndebug'] # FIXME add lto, pgo and the like
         self.id = 'msvc'
 
     def get_options(self):

test cases/windows/17 msvc ndebug/main.cpp

@@ -0,0 +1,9 @@
+int main() {
+#ifdef NDEBUG
+    // NDEBUG is defined
+    return 0;
+#else
+    // NDEBUG is not defined
+    return 1;
+#endif
+}

test cases/windows/17 msvc ndebug/meson.build

@@ -0,0 +1,7 @@
+project('msvc_ndebug', 'cpp',
+    default_options : [ 'b_ndebug=true' ]
+)
+
+exe = executable('exe', 'main.cpp')
+
+test('ndebug', exe)