diff --git a/CMakeLists.txt b/CMakeLists.txt
index f78d2f97..862e641a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -40,6 +40,7 @@ include(sources.cmake)
 add_definitions(-D_ENABLE_EXTENDED_ALIGNED_STORAGE)
 
 option(ENABLE_TESTS "Enable tests and examples. This changes many compiler flags" OFF)
+option(ENABLE_DFT "Enable DFT and related algorithms" ON)
 
 set(KFR_DFT_SRC
         ${CMAKE_CURRENT_SOURCE_DIR}/include/kfr/dft/impl/dft-src.cpp
@@ -99,8 +100,10 @@ add_library(kfr INTERFACE)
 target_sources(kfr INTERFACE ${KFR_SRC})
 target_include_directories(kfr INTERFACE include)
 
-add_library(kfr_dft ${KFR_DFT_SRC})
-target_link_libraries(kfr_dft kfr)
+if (ENABLE_DFT)
+    add_library(kfr_dft ${KFR_DFT_SRC})
+    target_link_libraries(kfr_dft kfr)
+endif()
 
 add_library(kfr_io ${KFR_IO_SRC})
 target_link_libraries(kfr_io kfr)
diff --git a/examples/CMakeLists.txt b/examples/CMakeLists.txt
index 3428a37d..f923f531 100644
--- a/examples/CMakeLists.txt
+++ b/examples/CMakeLists.txt
@@ -28,7 +28,12 @@ add_executable(window window.cpp)
 target_link_libraries(window kfr)
 
 add_executable(fir fir.cpp)
-target_link_libraries(fir kfr kfr_dft)
+
+target_link_libraries(fir kfr)
+if (ENABLE_DFT)
+    target_link_libraries(fir kfr_dft)
+    target_compile_definitions(fir PRIVATE -DHAVE_DFT)
+endif ()
 
 add_executable(sample_rate_conversion sample_rate_conversion.cpp)
 target_link_libraries(sample_rate_conversion kfr kfr_io)
@@ -36,5 +41,7 @@ target_link_libraries(sample_rate_conversion kfr kfr_io)
 add_executable(sample_rate_converter sample_rate_converter.cpp)
 target_link_libraries(sample_rate_converter kfr kfr_io)
 
-add_executable(dft dft.cpp)
-target_link_libraries(dft kfr kfr_dft)
+if (ENABLE_DFT)
+    add_executable(dft dft.cpp)
+    target_link_libraries(dft kfr kfr_dft)
+endif ()
diff --git a/examples/fir.cpp b/examples/fir.cpp
index c619ca51..169a7cf3 100644
--- a/examples/fir.cpp
+++ b/examples/fir.cpp
@@ -5,7 +5,9 @@
  */
 
 #include <kfr/base.hpp>
+#ifdef HAVE_DFT
 #include <kfr/dft.hpp>
+#endif
 #include <kfr/dsp.hpp>
 #include <kfr/io.hpp>
 
@@ -128,6 +130,7 @@ int main()
     plot_save("filtered_noise2", filtered_noise2, "title='Filtered noise 2', div_by_N=True");
 #endif
 
+#ifdef HAVE_DFT
     // --------------------------------------------------------------------------------------
     // ---------------------- Convolution filter (optimized using DFT) ----------------------
     // --------------------------------------------------------------------------------------
@@ -142,6 +145,7 @@ int main()
 #if PYTHON_IS_INSTALLED
     // Plot results, same as filtered_noise2
     plot_save("filtered_noise3", filtered_noise3, "title='Filtered noise 3', div_by_N=True");
+#endif
 #endif
 
     return 0;
diff --git a/include/kfr/base/memory.hpp b/include/kfr/base/memory.hpp
index 3b7b1aa7..fd7e6c58 100644
--- a/include/kfr/base/memory.hpp
+++ b/include/kfr/base/memory.hpp
@@ -27,6 +27,7 @@
 
 #include "read_write.hpp"
 #include "types.hpp"
+#include <algorithm>
 #include <atomic>
 #include <memory>
 
diff --git a/include/kfr/base/pointer.hpp b/include/kfr/base/pointer.hpp
index 6412ce24..e795ee0c 100644
--- a/include/kfr/base/pointer.hpp
+++ b/include/kfr/base/pointer.hpp
@@ -42,7 +42,7 @@ namespace internal
 
 template <typename Expression, typename T, size_t key = 0>
 KFR_SINTRIN bool invoke_substitute(Expression& expr, expression_pointer<T>&& new_pointer,
-                                   csize_t<key> = csize_t<key>{});
+                                   csize_t<key> = {});
 }
 
 template <typename T, size_t N = maximum_expression_width>
diff --git a/include/kfr/base/simd_clang.hpp b/include/kfr/base/simd_clang.hpp
index ab90009d..e4fe6492 100644
--- a/include/kfr/base/simd_clang.hpp
+++ b/include/kfr/base/simd_clang.hpp
@@ -29,6 +29,8 @@
 #include "platform.hpp"
 #include "types.hpp"
 
+#if CMT_COMPILER_CLANG
+
 CMT_PRAGMA_MSVC(warning(push))
 CMT_PRAGMA_MSVC(warning(disable : 4324))
 
@@ -344,3 +346,5 @@ constexpr inline vec<T, csum<size_t, Ns...>()> concat(const vec<T, Ns>&... vs) n
 } // namespace kfr
 
 CMT_PRAGMA_MSVC(warning(pop))
+
+#endif
diff --git a/include/kfr/base/univector.hpp b/include/kfr/base/univector.hpp
index a02e8e92..592b31c3 100644
--- a/include/kfr/base/univector.hpp
+++ b/include/kfr/base/univector.hpp
@@ -374,6 +374,10 @@ struct univector<T, tag_dynamic_vector> : std::vector<T, allocator<T>>,
         : std::vector<T, allocator<T>>(other.begin(), other.end())
     {
     }
+    template <typename Allocator>
+    constexpr univector(const std::vector<T, Allocator>&) = delete;
+    template <typename Allocator>
+    constexpr univector(std::vector<T, Allocator>&&) = delete;
     constexpr static bool size_known   = false;
     constexpr static bool is_array     = false;
     constexpr static bool is_array_ref = false;
diff --git a/include/kfr/base/vec.hpp b/include/kfr/base/vec.hpp
index 2fbf15e0..ea14349e 100644
--- a/include/kfr/base/vec.hpp
+++ b/include/kfr/base/vec.hpp
@@ -128,14 +128,14 @@ constexpr inline size_t scale_get_index(size_t counter, size_t groupsize, size_t
 }
 
 template <size_t counter, size_t groupsize, size_t... indices>
-constexpr inline size_t scale_get_index()
+constexpr inline size_t scale_get_index(csizes_t<indices...>)
 {
     return scale_get_index(counter, groupsize, csizes_t<indices...>().get(csize_t<counter / groupsize>()));
 }
 
 template <size_t... indices, size_t... counter, size_t groupsize = sizeof...(counter) / sizeof...(indices)>
 constexpr inline auto scale_impl(csizes_t<indices...> ind, csizes_t<counter...> cnt) noexcept
-    -> csizes_t<scale_get_index<counter, groupsize, indices...>()...>
+    -> csizes_t<scale_get_index<counter, groupsize>(ind)...>
 {
     return {};
 }
diff --git a/include/kfr/cometa.hpp b/include/kfr/cometa.hpp
index f19db48c..7e4f3ef3 100644
--- a/include/kfr/cometa.hpp
+++ b/include/kfr/cometa.hpp
@@ -253,14 +253,15 @@ namespace ops
 {
 struct empty
 {
+    constexpr empty() noexcept {}
 };
 } // namespace ops
 
 template <typename T, T val>
 struct cval_t : ops::empty
 {
-    constexpr static T value                 = val;
-    constexpr cval_t() noexcept              = default;
+    constexpr static T value = val;
+    constexpr cval_t() noexcept {}
     constexpr cval_t(const cval_t&) noexcept = default;
     constexpr cval_t(cval_t&&) noexcept      = default;
     typedef T value_type;
@@ -359,6 +360,9 @@ struct get_nth<0, T, first, rest...>
     constexpr static T value = first;
 };
 
+template <size_t index, typename T>
+struct get_nth_e;
+
 template <size_t index, typename... Types>
 struct get_nth_type;
 
@@ -406,7 +410,7 @@ struct cvals_t : ops::empty
         return &arr[0];
     }
     template <size_t... indices>
-    constexpr cvals_t<T, details::get_nth<indices, T, values...>::value...> operator[](
+    constexpr cvals_t<T, details::get_nth_e<indices, type>::value...> operator[](
         cvals_t<size_t, indices...>) const
     {
         return {};
@@ -427,6 +431,15 @@ struct cvals_t<T> : ops::empty
     constexpr static size_t size() { return 0; }
 };
 
+namespace details
+{
+template <size_t index, typename T, T... vals>
+struct get_nth_e<index, cvals_t<T, vals...>>
+{
+    constexpr static T value = get_nth<index, T, vals...>::value;
+};
+} // namespace details
+
 template <bool... values>
 using cbools_t = cvals_t<bool, values...>;
 
@@ -1658,8 +1671,6 @@ constexpr bool is_sequence(csizes_t<number, numbers...>)
     return details::test_sequence<number, 1 + sizeof...(numbers)>(csizes_t<number, numbers...>()).value;
 }
 
-#ifdef CMT_COMPILER_GNU
-
 template <typename T, T val>
 constexpr cval_t<T, val> cval{};
 
@@ -1727,7 +1738,6 @@ template <size_t size, unsigned start = 0, ptrdiff_t step = 1>
 constexpr cvalseq_t<unsigned, size, start, step> cuintseq{};
 template <typename... List>
 constexpr indicesfor_t<List...> indicesfor{};
-#endif
 
 // Workaround for GCC 4.8
 template <typename T>
diff --git a/include/kfr/cometa/array.hpp b/include/kfr/cometa/array.hpp
index 2fc5c955..ef3d3ee4 100644
--- a/include/kfr/cometa/array.hpp
+++ b/include/kfr/cometa/array.hpp
@@ -51,8 +51,8 @@ struct array_ref
     constexpr array_ref(std::array<T, N>& arr) noexcept : m_data(arr.data()), m_size(N)
     {
     }
-    template <typename... Ts>
-    constexpr array_ref(const std::vector<T, Ts...>& vec) noexcept : m_data(vec.data()), m_size(vec.size())
+    template <typename Alloc>
+    constexpr array_ref(const std::vector<T, Alloc>& vec) noexcept : m_data(vec.data()), m_size(vec.size())
     {
     }
 
diff --git a/include/kfr/data/sincos.hpp b/include/kfr/data/sincos.hpp
index f4115ca2..25984046 100644
--- a/include/kfr/data/sincos.hpp
+++ b/include/kfr/data/sincos.hpp
@@ -33,11 +33,7 @@ namespace data
 {
 
 template <typename T>
-constexpr T c_sin_table[65];
-
-// data generated by mpfr
-template <>
-constexpr f32 c_sin_table<f32>[65] = {
+constexpr T c_sin_table[65] = {
     /* sin(2*pi*   0/ 256) */ f32(0.0),
     /* sin(2*pi*   1/ 256) */ f32(0.02454122852291228803173452945928292506547),
     /* sin(2*pi*   2/ 256) */ f32(0.04906767432741801425495497694268265831475),
diff --git a/include/kfr/dft/impl/dft-impl.hpp b/include/kfr/dft/impl/dft-impl.hpp
index 08039d5a..bb9be49a 100644
--- a/include/kfr/dft/impl/dft-impl.hpp
+++ b/include/kfr/dft/impl/dft-impl.hpp
@@ -504,22 +504,25 @@ static void dft_stage_fixed_initialize(dft_stage<T>* stage, size_t width)
     }
 }
 
-template <typename T, size_t radix>
+template <typename T, size_t fixed_radix>
 struct dft_stage_fixed_impl : dft_stage<T>
 {
     dft_stage_fixed_impl(size_t radix_, size_t iterations, size_t blocks)
     {
         this->name      = type_name<decltype(*this)>();
-        this->radix     = radix;
+        this->radix     = fixed_radix;
         this->blocks    = blocks;
         this->repeats   = iterations;
         this->recursion = false; // true;
-        this->data_size =
-            align_up((this->repeats * (radix - 1)) * sizeof(complex<T>), platform<>::native_cache_alignment);
+        this->data_size = align_up((this->repeats * (fixed_radix - 1)) * sizeof(complex<T>),
+                                   platform<>::native_cache_alignment);
     }
 
-    constexpr static size_t width =
-        radix >= 7 ? fft_vector_width<T> / 2 : radix >= 4 ? fft_vector_width<T> : fft_vector_width<T> * 2;
+    constexpr static size_t rradix = fixed_radix;
+
+    constexpr static size_t width = fixed_radix >= 7
+                                        ? fft_vector_width<T> / 2
+                                        : fixed_radix >= 4 ? fft_vector_width<T> : fft_vector_width<T> * 2;
     virtual void do_initialize(size_t size) override final { dft_stage_fixed_initialize(this, width); }
 
     DFT_STAGE_FN
@@ -529,40 +532,41 @@ struct dft_stage_fixed_impl : dft_stage<T>
         const size_t Nord         = this->repeats;
         const complex<T>* twiddle = ptr_cast<complex<T>>(this->data);
 
-        const size_t N = Nord * this->radix;
+        const size_t N = Nord * fixed_radix;
         CMT_LOOP_NOUNROLL
         for (size_t b = 0; b < this->blocks; b++)
         {
-            butterflies(Nord, csize<width>, csize<radix>, cbool<inverse>, out, in, twiddle, Nord);
+            butterflies(Nord, csize<width>, csize<fixed_radix>, cbool<inverse>, out, in, twiddle, Nord);
             in += N;
             out += N;
         }
     }
 };
 
-template <typename T, size_t radix>
+template <typename T, size_t fixed_radix>
 struct dft_stage_fixed_final_impl : dft_stage<T>
 {
     dft_stage_fixed_final_impl(size_t radix_, size_t iterations, size_t blocks)
     {
         this->name        = type_name<decltype(*this)>();
-        this->radix       = radix;
+        this->radix       = fixed_radix;
         this->blocks      = blocks;
         this->repeats     = iterations;
         this->recursion   = false;
         this->can_inplace = false;
     }
-    constexpr static size_t width =
-        radix >= 7 ? fft_vector_width<T> / 2 : radix >= 4 ? fft_vector_width<T> : fft_vector_width<T> * 2;
+    constexpr static size_t width = fixed_radix >= 7
+                                        ? fft_vector_width<T> / 2
+                                        : fixed_radix >= 4 ? fft_vector_width<T> : fft_vector_width<T> * 2;
 
     DFT_STAGE_FN
     template <bool inverse>
     KFR_INTRIN void do_execute(complex<T>* out, const complex<T>* in, u8*)
     {
         const size_t b    = this->blocks;
-        const size_t size = b * radix;
+        const size_t size = b * fixed_radix;
 
-        butterflies(b, csize<width>, csize<radix>, cbool<inverse>, out, in, b);
+        butterflies(b, csize<width>, csize<fixed_radix>, cbool<inverse>, out, in, b);
     }
 };
 
diff --git a/include/kfr/dft/impl/dft-templates.hpp b/include/kfr/dft/impl/dft-templates.hpp
index f8d4f959..59a8ef7a 100644
--- a/include/kfr/dft/impl/dft-templates.hpp
+++ b/include/kfr/dft/impl/dft-templates.hpp
@@ -24,6 +24,7 @@
   See https://www.kfrlib.com for details.
  */
 
+#ifdef FLOAT
 #include "../fft.hpp"
 
 namespace kfr
@@ -42,3 +43,5 @@ template void dft_plan_real<FLOAT>::from_fmt(kfr::complex<FLOAT>* out, const kfr
 template void dft_plan_real<FLOAT>::to_fmt(kfr::complex<FLOAT>* out, kfr::dft_pack_format fmt) const;
 
 } // namespace kfr
+
+#endif
diff --git a/include/kfr/dft/impl/ft.hpp b/include/kfr/dft/impl/ft.hpp
index fd649ec6..b04026b1 100644
--- a/include/kfr/dft/impl/ft.hpp
+++ b/include/kfr/dft/impl/ft.hpp
@@ -1677,15 +1677,15 @@ KFR_INTRIN void spec_generic_butterfly_w(csize_t<radix>, cbool_t<inverse>, compl
 
 template <typename T, bool inverse, typename Tstride = csize_t<1>>
 KFR_INTRIN void generic_butterfly(size_t radix, cbool_t<inverse>, complex<T>* out, const complex<T>* in,
-                                  complex<T>* temp, const complex<T>* twiddle, Tstride ostride = Tstride{})
+                                  complex<T>* temp, const complex<T>* twiddle, Tstride ostride = {})
 {
-    constexpr size_t width = platform<T>::vector_width;
-
     cswitch(csizes_t<11, 13>(), radix,
             [&](auto radix_) CMT_INLINE_LAMBDA {
+                constexpr size_t width = platform<T>::vector_width;
                 spec_generic_butterfly_w<width>(radix_, cbool_t<inverse>(), out, in, twiddle, ostride);
             },
             [&]() CMT_INLINE_LAMBDA {
+                constexpr size_t width = platform<T>::vector_width;
                 generic_butterfly_w<width>(radix, cbool_t<inverse>(), out, in, twiddle, ostride);
             });
 }
diff --git a/include/kfr/ext/double_double.hpp b/include/kfr/ext/double_double.hpp
index 4870f294..4ccc2d12 100644
--- a/include/kfr/ext/double_double.hpp
+++ b/include/kfr/ext/double_double.hpp
@@ -38,10 +38,17 @@ struct double_double
         const double cc       = ((((x.hi - u.hi) - u.lo) + x.lo) - c * y.lo) / y.hi;
         return { c, cc };
     }
-    constexpr bool isinf() const noexcept { return std::isinf(hi); }
-    constexpr bool isnan() const noexcept { return std::isnan(hi) || std::isnan(lo); }
 
-    constexpr double ulp(float value) const noexcept
+#if defined _MSC_VER && !defined __clang__
+#define DOUBLEDOUBLE_CONSTEXPR
+#else
+#define DOUBLEDOUBLE_CONSTEXPR constexpr
+#endif
+
+    DOUBLEDOUBLE_CONSTEXPR bool isinf() const noexcept { return std::isinf(hi); }
+    DOUBLEDOUBLE_CONSTEXPR bool isnan() const noexcept { return std::isnan(hi) || std::isnan(lo); }
+
+    DOUBLEDOUBLE_CONSTEXPR double ulp(float value) const noexcept
     {
         if (std::isnan(value) && isnan())
             return 0.0;
@@ -51,7 +58,7 @@ struct double_double
             return 1.0;
         return (double_double(value) - *this) / double_double(std::nexttoward(value, 0.0));
     }
-    constexpr double ulp(double value) const noexcept
+    DOUBLEDOUBLE_CONSTEXPR double ulp(double value) const noexcept
     {
         if (std::isnan(value) && isnan())
             return 0.0;
diff --git a/include/kfr/io/audiofile.hpp b/include/kfr/io/audiofile.hpp
index 7c5e0482..46a34ffc 100644
--- a/include/kfr/io/audiofile.hpp
+++ b/include/kfr/io/audiofile.hpp
@@ -64,6 +64,9 @@ struct audio_format
 struct audio_format_and_length : audio_format
 {
     using audio_format::audio_format;
+#ifdef CMT_COMPILER_MSVC
+    audio_format_and_length() noexcept {}
+#endif
     audio_format_and_length(const audio_format& fmt) : audio_format(fmt) {}
 
     imax length = 0; // in samples
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index c3836bc4..06912885 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -41,10 +41,15 @@ set(ALL_TESTS_CPP
     all_tests.cpp
     base_test.cpp
     complex_test.cpp
-    dft_test.cpp
     dsp_test.cpp
     expression_test.cpp
-    intrinsic_test.cpp io_test.cpp resampler_test.cpp)
+    intrinsic_test.cpp
+    io_test.cpp
+    resampler_test.cpp)
+
+if (ENABLE_DFT)
+    list(APPEND ALL_TESTS_CPP dft_test.cpp)
+endif ()
 
 if (MPFR_FOUND AND GMP_FOUND)
     list(APPEND ALL_TESTS_CPP transcendental_test.cpp)
@@ -54,8 +59,10 @@ endif ()
 
 add_executable(all_tests ${ALL_TESTS_CPP})
 target_compile_definitions(all_tests PRIVATE KFR_NO_MAIN)
-target_link_libraries(all_tests kfr kfr_dft)
-target_link_libraries(all_tests kfr kfr_dft kfr_io)
+if (ENABLE_DFT)
+    target_link_libraries(all_tests kfr kfr_dft)
+endif ()
+target_link_libraries(all_tests kfr kfr_io)
 
 if (MPFR_FOUND AND GMP_FOUND)
     add_definitions(-DHAVE_MPFR)
@@ -65,7 +72,10 @@ endif ()
 
 function(add_x86_test NAME FLAGS)
     separate_arguments(FLAGS)
-    add_executable(all_tests_${NAME} ${ALL_TESTS_CPP}  ${KFR_DFT_SRC} ${KFR_IO_SRC})
+    add_executable(all_tests_${NAME} ${ALL_TESTS_CPP}  ${KFR_IO_SRC})
+    if (ENABLE_DFT)
+        target_sources(all_tests_${NAME} PRIVATE ${KFR_DFT_SRC})
+    endif ()
     target_compile_options(all_tests_${NAME} PRIVATE ${FLAGS})
     target_compile_definitions(all_tests_${NAME} PRIVATE KFR_NO_MAIN)
     target_link_libraries(all_tests_${NAME} kfr)