update meson

meson.build

@@ -5,6 +5,15 @@
 #
 ############################################################
 
+# TODO:
+#
+# shared_library build
+# 'accurate' and 'generic' builds
+# test non-debug version (meson builds generic by default)
+# profile-guided optimization
+# build with clang
+# build with various old compilers
+
 ############################################################
 # define the binary_c project
 project(
@@ -231,7 +240,12 @@ if run_command('sh','-c','meson/diff_starstruct.sh').returncode() == 0
    cflags += '-D__DIFF_STARDATA__'
 endif
 
-
+########################
+# Unsupported features #
+########################
+if compiler.get_id() != 'gcc' and compiler.get_id() != 'clang'
+   cflags += '-UBACKTRACE'
+endif
 
 ############################################################
 # make a list of include directories