util/Compiler.h: move compiler version checks to meson.build

meson.build

@@ -15,6 +15,12 @@ version_cxx = vcs_tag(input: 'src/GitVersion.cxx', output: 'GitVersion.cxx')
 compiler = meson.get_compiler('cpp')
 c_compiler = meson.get_compiler('c')
 
+if compiler.get_id() == 'gcc' and compiler.version().version_compare('<6')
+  warning('Your GCC version is too old.  You need at least version 6.')
+elif compiler.get_id() == 'clang' and compiler.version().version_compare('<3')
+  warning('Your clang version is too old.  You need at least version 3.')
+endif
+
 conf = configuration_data()
 conf.set_quoted('PACKAGE', meson.project_name())
 conf.set_quoted('PACKAGE_NAME', meson.project_name())

src/util/Compiler.h

@@ -57,18 +57,6 @@
 	(GCC_VERSION > 0 && CLANG_VERSION == 0 && \
 	 GCC_VERSION < GCC_MAKE_VERSION(major, minor, 0))
 
-#ifdef __clang__
-#  if __clang_major__ < 3
-#    error Sorry, your clang version is too old.  You need at least version 3.1.
-#  endif
-#elif defined(__GNUC__)
-#  if GCC_OLDER_THAN(6,0)
-#    error Sorry, your gcc version is too old.  You need at least version 6.0.
-#  endif
-#else
-#  warning Untested compiler.  Use at your own risk!
-#endif
-
 /**
  * Are we building with the specified version of clang or newer?
  */