mkvtoolnix/ac/compiler_version.m4

AC_CACHE_CHECK(
  [compiler version],
  [ac_cv_compiler_version],
  [
  if test x"$ac_cv_compiler_is_clang" = xyes; then
    ac_cv_compiler_version=`LC_ALL=C $CXX --version | sed -e 's/^[[^0-9]]*//' -e 's/[[^0-9.]].*//' -e '1q'`
  else
    ac_cv_compiler_version=`$CXX -dumpversion`
  fi
])
configure: get real version for clang(++) `clang++ -dumpversion` always outputs 4.2.1 as it was designed to be compatible with `g++` in that version. So parse `clang++ --version` for `clang++` instead. 2017-11-17 20:32:10 +00:00			`AC_CACHE_CHECK(`
			`[compiler version],`
			`[ac_cv_compiler_version],`
			`[`
			`if test x"$ac_cv_compiler_is_clang" = xyes; then`
			ac_cv_compiler_version=`LC_ALL=C $CXX --version \| sed -e 's/^[[^0-9]]//' -e 's/[[^0-9.]].//' -e '1q'`
			`else`
			ac_cv_compiler_version=`$CXX -dumpversion`
			`fi`
			`])`