Cleanup compiler warnings: unused variables/typedefs, uninitialised vars, etc.

stan/math/fwd/fun/mdivide_left.hpp

@@ -60,9 +60,6 @@ template <typename T1, typename T2,
 inline Eigen::Matrix<value_type_t<T2>, T1::RowsAtCompileTime,
                      T2::ColsAtCompileTime>
 mdivide_left(const T1& A, const T2& b) {
-  constexpr int S1 = T1::RowsAtCompileTime;
-  constexpr int C2 = T2::ColsAtCompileTime;
-
   check_square("mdivide_left", "A", A);
   check_multiplicable("mdivide_left", "A", A, "b", b);
   if (A.size() == 0) {

stan/math/fwd/fun/mdivide_left_tri_low.hpp

@@ -56,7 +56,6 @@ inline Eigen::Matrix<value_type_t<T2>, T1::RowsAtCompileTime,
                      T2::ColsAtCompileTime>
 mdivide_left_tri_low(const T1& A, const T2& b) {
   constexpr int S1 = T1::RowsAtCompileTime;
-  constexpr int C2 = T2::ColsAtCompileTime;
 
   check_square("mdivide_left_tri_low", "A", A);
   check_multiplicable("mdivide_left_tri_low", "A", A, "b", b);

stan/math/fwd/fun/mdivide_right.hpp

@@ -97,7 +97,6 @@ inline Eigen::Matrix<value_type_t<EigMat2>, EigMat1::RowsAtCompileTime,
 mdivide_right(const EigMat1& A, const EigMat2& b) {
   using T = typename value_type_t<EigMat2>::Scalar;
   constexpr int R1 = EigMat1::RowsAtCompileTime;
-  constexpr int C1 = EigMat1::ColsAtCompileTime;
   constexpr int R2 = EigMat2::RowsAtCompileTime;
   constexpr int C2 = EigMat2::ColsAtCompileTime;
 

stan/math/fwd/fun/mdivide_right_tri_low.hpp

@@ -98,7 +98,6 @@ inline Eigen::Matrix<value_type_t<EigMat2>, EigMat1::RowsAtCompileTime,
 mdivide_right_tri_low(const EigMat1& A, const EigMat2& b) {
   using T = typename value_type_t<EigMat2>::Scalar;
   constexpr int R1 = EigMat1::RowsAtCompileTime;
-  constexpr int C1 = EigMat1::ColsAtCompileTime;
   constexpr int R2 = EigMat2::RowsAtCompileTime;
   constexpr int C2 = EigMat2::ColsAtCompileTime;
   check_square("mdivide_right_tri_low", "b", b);

stan/math/opencl/kernel_generator/broadcast.hpp

@@ -98,7 +98,6 @@ class broadcast_
    * @return pair of indices - bottom and top diagonal
    */
   inline std::pair<int, int> extreme_diagonals() const {
-    int bottom, top;
     std::pair<int, int> arg_diags
         = this->template get_arg<0>().extreme_diagonals();
     return {Colwise ? std::numeric_limits<int>::min() : arg_diags.first,

stan/math/opencl/mrrr.hpp

@@ -373,7 +373,6 @@ inline void mrrr_cl(const Eigen::Ref<const Eigen::VectorXd> diagonal,
       cluster_end--;  // now this is the index of the last element of the
                       // cluster
       if (cluster_end > i) {  // cluster
-        double_d a = high[cluster_end - 1], b = low[cluster_end];
         double_d max_shift
             = (high[cluster_end - 1] - low[cluster_end]) / min_rel_sep;
         double_d next_shift;
@@ -396,7 +395,6 @@ inline void mrrr_cl(const Eigen::Ref<const Eigen::VectorXd> diagonal,
 
         i = cluster_end;
       } else {  // isolated eigenvalue
-        int twist_idx;
         const double_d low_gap
             = i == block.start
                   ? double_d(std::numeric_limits<double>::infinity())

stan/math/opencl/prim/bernoulli_cdf.hpp

@@ -33,7 +33,6 @@ return_type_t<T_prob_cl> bernoulli_cdf(const T_n_cl& n,
   using T_partials_return = partials_return_t<T_prob_cl>;
   using std::isnan;
   constexpr bool is_n_vector = !is_stan_scalar<T_n_cl>::value;
-  constexpr bool is_theta_vector = !is_stan_scalar<T_prob_cl>::value;
 
   check_consistent_sizes(function, "Random variable", n,
                          "Probability parameter", theta);

stan/math/opencl/prim/bernoulli_lccdf.hpp

@@ -34,7 +34,6 @@ return_type_t<T_prob_cl> bernoulli_lccdf(const T_n_cl& n,
   using T_partials_return = partials_return_t<T_prob_cl>;
   using std::isnan;
   constexpr bool is_n_vector = !is_stan_scalar<T_n_cl>::value;
-  constexpr bool is_theta_vector = !is_stan_scalar<T_prob_cl>::value;
 
   check_consistent_sizes(function, "Random variable", n,
                          "Probability parameter", theta);

stan/math/opencl/prim/bernoulli_lcdf.hpp

@@ -34,7 +34,6 @@ return_type_t<T_prob_cl> bernoulli_lcdf(const T_n_cl& n,
   using T_partials_return = partials_return_t<T_prob_cl>;
   using std::isnan;
   constexpr bool is_n_vector = !is_stan_scalar<T_n_cl>::value;
-  constexpr bool is_theta_vector = !is_stan_scalar<T_prob_cl>::value;
 
   check_consistent_sizes(function, "Random variable", n,
                          "Probability parameter", theta);

stan/math/opencl/prim/bernoulli_logit_lpmf.hpp

@@ -32,7 +32,6 @@ return_type_t<T_prob_cl> bernoulli_logit_lpmf(const T_n_cl& n,
   using T_partials_return = partials_return_t<T_prob_cl>;
   using std::isnan;
   constexpr bool is_n_vector = !is_stan_scalar<T_n_cl>::value;
-  constexpr bool is_theta_vector = !is_stan_scalar<T_prob_cl>::value;
 
   check_consistent_sizes(function, "Random variable", n,
                          "Probability parameter", theta);

stan/math/opencl/prim/dot_self.hpp

@@ -19,7 +19,6 @@ namespace math {
 template <typename T,
           require_all_kernel_expressions_and_none_scalar_t<T>* = nullptr>
 inline auto dot_self(const T& a) {
-  const char* function = "dot_self(OpenCL)";
   return sum(elt_multiply(a, a));
 }
 

stan/math/opencl/prim/poisson_log_lpmf.hpp

@@ -35,7 +35,6 @@ return_type_t<T_log_rate_cl> poisson_log_lpmf(const T_n_cl& n,
   using std::isinf;
   using std::isnan;
   constexpr bool is_n_vector = !is_stan_scalar<T_n_cl>::value;
-  constexpr bool is_alpha_vector = !is_stan_scalar<T_log_rate_cl>::value;
 
   check_consistent_sizes(function, "Random variable", n, "Log rate parameter",
                          alpha);

stan/math/opencl/prim/poisson_lpmf.hpp

@@ -34,7 +34,6 @@ return_type_t<T_rate_cl> poisson_lpmf(const T_n_cl& n,
   using T_partials_return = partials_return_t<T_rate_cl>;
   using std::isinf;
   constexpr bool is_n_vector = !is_stan_scalar<T_n_cl>::value;
-  constexpr bool is_lambda_vector = !is_stan_scalar<T_rate_cl>::value;
 
   check_consistent_sizes(function, "Random variable", n, "Rate parameter",
                          lambda);

stan/math/opencl/rev/matrix_power.hpp

@@ -34,16 +34,17 @@ inline var_value<matrix_cl<double>> matrix_power(const var_value<T>& M,
   if (M.size() == 0)
     return M;
 
-  size_t N = M.rows();
+  auto N = M.rows();
+
   if (n == 0) {
-    return diag_matrix(constant(1.0, M.rows(), 1));
+    return diag_matrix(constant(1.0, N, 1));
   }
   if (n == 1) {
     return M;
   }
 
   arena_t<std::vector<matrix_cl<double>>> arena_powers(n + 1);
-  arena_powers[0] = diag_matrix(constant(1.0, M.rows(), 1));
+  arena_powers[0] = diag_matrix(constant(1.0, N, 1));
   arena_powers[1] = M.val();
   for (size_t i = 2; i <= n; ++i) {
     arena_powers[i] = arena_powers[1] * arena_powers[i - 1];

stan/math/opencl/rev/softmax.hpp

@@ -2,7 +2,8 @@
 #define STAN_MATH_OPENCL_REV_SOFTMAX_HPP
 #ifdef STAN_OPENCL
 
-#include <stan/math/opencl/prim/log_sum_exp.hpp>
+#include <stan/math/opencl/prim/dot_product.hpp>
+#include <stan/math/opencl/prim/softmax.hpp>
 #include <stan/math/opencl/kernel_generator.hpp>
 #include <stan/math/rev/core.hpp>
 #include <stan/math/rev/fun/value_of.hpp>

stan/math/prim/fun/cholesky_factor_constrain.hpp

@@ -37,7 +37,6 @@ cholesky_factor_constrain(const T& x, int M, int N) {
                    "((N * (N + 1)) / 2 + (M - N) * N)",
                    ((N * (N + 1)) / 2 + (M - N) * N));
   Eigen::Matrix<T_scalar, Eigen::Dynamic, Eigen::Dynamic> y(M, N);
-  T_scalar zero(0);
   int pos = 0;
 
   const auto& x_ref = to_ref(x);

stan/math/prim/fun/gp_exponential_cov.hpp

@@ -282,7 +282,6 @@ gp_exponential_cov(const std::vector<Eigen::Matrix<T_x1, -1, 1>> &x1,
   }
 
   T_s sigma_sq = square(sigma);
-  T_l temp;
 
   std::vector<Eigen::Matrix<return_type_t<T_x1, T_l>, -1, 1>> x1_new
       = divide_columns(x1, length_scale);

stan/math/prim/fun/grad_2F1.hpp

@@ -65,7 +65,6 @@ TupleT grad_2F1_impl_ab(const T1& a1, const T2& a2, const T3& b1, const T_z& z,
   int sign_z = sign(z);
   auto log_z = log(abs(z));
 
-  double log_precision = log(precision);
   int log_t_new_sign = 1.0;
   int log_t_old_sign = 1.0;
 
@@ -190,7 +189,6 @@ TupleT grad_2F1_impl(const T1& a1, const T2& a2, const T3& b1, const T_z& z,
     if (calc_z) {
       auto hyper1 = hypergeometric_2F1(a1_euler, a2_euler, b1, z_euler);
       auto hyper2 = hypergeometric_2F1(1 + a2, 1 - a1 + b1, 1 + b1, z_euler);
-      auto pre_mult = a2 * pow(1 - z, -1 - a2);
       std::get<3>(grad_tuple_rtn)
           = a2 * pow(1 - z, -1 - a2) * hyper1
             + (a2 * (b1 - a1) * pow(1 - z, -a2)

stan/math/prim/fun/lb_free.hpp

@@ -83,9 +83,9 @@ inline auto lb_free(T&& y, L&& lb) {
 template <typename T, typename L, require_not_std_vector_t<L>* = nullptr>
 inline auto lb_free(const std::vector<T> y, const L& lb) {
   auto&& lb_ref = to_ref(lb);
-  std::vector<decltype(lb_free(y[0], lb))> ret(y.size());
+  std::vector<decltype(lb_free(y[0], lb_ref))> ret(y.size());
   std::transform(y.begin(), y.end(), ret.begin(),
-                 [&lb](auto&& yy) { return lb_free(yy, lb); });
+                 [&lb_ref](auto&& yy) { return lb_free(yy, lb_ref); });
   return ret;
 }
 

stan/math/prim/fun/stan_print.hpp

@@ -71,7 +71,6 @@ void stan_print(std::ostream* o, const T& x) {
 template <typename T, require_tuple_t<T>*>
 void stan_print(std::ostream* o, const T& x) {
   *o << '(';
-  constexpr auto tuple_size = std::tuple_size<std::decay_t<T>>::value;
   size_t i = 0;
   stan::math::for_each(
       [&i, o](auto&& elt) {

stan/math/prim/functor/hcubature.hpp

@@ -465,7 +465,6 @@ double hcubature(const F& integrand, const T_pars& pars, const int& dim,
   int numevals
       = (dim == 1) ? 15 : 1 + 4 * dim + 2 * dim * (dim - 1) + std::pow(2, dim);
   int evals_per_box = numevals;
-  int kdiv = kdivide;
   double error = err;
   double val = result;
 
@@ -491,7 +490,9 @@ double hcubature(const F& integrand, const T_pars& pars, const int& dim,
     std::vector<double> mb(box.b);
     mb[box.kdiv] -= w;
 
-    double result_1, result_2, err_1, err_2, kdivide_1, kdivide_2;
+    double result_1, result_2, err_1, err_2;
+    double kdivide_1 = math::NOT_A_NUMBER;
+    double kdivide_2 = math::NOT_A_NUMBER;
 
     if (dim == 1) {
       std::tie(result_1, err_1)

stan/math/prim/functor/operands_and_partials.hpp

@@ -54,7 +54,8 @@ class ops_partials_edge;
  *  for this specialization must be a `Arithmetic`
  */
 template <typename ViewElt, typename Op>
-struct ops_partials_edge<ViewElt, Op, require_st_arithmetic<Op>> {
+class ops_partials_edge<ViewElt, Op, require_st_arithmetic<Op>> {
+ public:
   using inner_op = std::conditional_t<is_eigen<value_type_t<Op>>::value,
                                       value_type_t<Op>, Op>;
   using partials_t = empty_broadcast_array<ViewElt, inner_op>;

stan/math/prim/functor/partials_propagator.hpp

@@ -16,7 +16,7 @@ namespace math {
 namespace internal {
 
 template <typename ReturnType, typename Enable, typename... Ops>
-struct partials_propagator;
+class partials_propagator;
 
 /** \ingroup type_trait
  * \callergraph

stan/math/prim/prob/gaussian_dlm_obs_rng.hpp

@@ -97,22 +97,22 @@ inline Eigen::MatrixXd gaussian_dlm_obs_rng(const Eigen::MatrixXd &F,
   int r = F.cols();  // number of variables
   int n = G.rows();  // number of states
 
-  check_size_match(function, "rows of F", F.rows(), "rows of G", G.rows());
+  check_size_match(function, "rows of F", F.rows(), "rows of G", n);
   check_finite(function, "F", F);
   check_square(function, "G", G);
   check_finite(function, "G", G);
-  check_size_match(function, "rows of V", V.rows(), "cols of F", F.cols());
+  check_size_match(function, "rows of V", V.rows(), "cols of F", r);
   check_finite(function, "V", V);
   check_positive(function, "V rows", V.rows());
   check_symmetric(function, "V", V);
-  check_size_match(function, "rows of W", W.rows(), "rows of G", G.rows());
+  check_size_match(function, "rows of W", W.rows(), "rows of G", n);
   check_finite(function, "W", W);
   check_positive(function, "W rows", W.rows());
   check_symmetric(function, "W", W);
-  check_size_match(function, "rows of W", W.rows(), "rows of G", G.rows());
-  check_size_match(function, "size of m0", m0.size(), "rows of G", G.rows());
+  check_size_match(function, "rows of W", W.rows(), "rows of G", n);
+  check_size_match(function, "size of m0", m0.size(), "rows of G", n);
   check_finite(function, "m0", m0);
-  check_size_match(function, "rows of C0", C0.rows(), "rows of G", G.rows());
+  check_size_match(function, "rows of C0", C0.rows(), "rows of G", n);
   check_finite(function, "C0", C0);
   check_positive(function, "C0 rows", C0.rows());
   check_symmetric(function, "C0", C0);

stan/math/prim/prob/multi_student_t_lpdf.hpp

@@ -53,8 +53,6 @@ return_type_t<T_y, T_dof, T_loc, T_scale> multi_student_t_lpdf(
   check_positive(function, "Degrees of freedom parameter", nu);
   check_finite(function, "Degrees of freedom parameter", nu);
 
-  size_t num_y = size_mvt(y);
-  size_t num_mu = size_mvt(mu);
   check_consistent_sizes_mvt(function, "y", y, "mu", mu);
 
   vector_seq_view<T_y> y_vec(y);

stan/math/prim/prob/skew_double_exponential_lccdf.hpp

@@ -71,7 +71,6 @@ return_type_t<T_y, T_loc, T_scale, T_skewness> skew_double_exponential_lccdf(
   scalar_seq_view<std::decay_t<decltype(sigma_val)>> sigma_vec(sigma_val);
   scalar_seq_view<std::decay_t<decltype(tau_val)>> tau_vec(tau_val);
 
-  const int size_sigma = stan::math::size(sigma);
   const auto N = max_size(y, mu, sigma, tau);
   auto inv_sigma_val = to_ref(inv(sigma_val));
   scalar_seq_view<decltype(inv_sigma_val)> inv_sigma(inv_sigma_val);

stan/math/rev/core/grad.hpp

@@ -23,7 +23,7 @@ namespace math {
  * <p>This function does not recover any memory from the computation.
  *
  */
-static void grad() {
+static inline void grad() {
   size_t end = ChainableStack::instance_->var_stack_.size();
   size_t beginning = empty_nested() ? 0 : end - nested_size();
   for (size_t i = end; i-- > beginning;) {

stan/math/rev/core/operator_subtraction.hpp

@@ -101,7 +101,7 @@ template <typename Arith, require_arithmetic_t<Arith>* = nullptr>
 inline var operator-(Arith a, const var& b) {
   return make_callback_vari(
       a - b.vi_->val_,
-      [bvi = b.vi_, a](const auto& vi) mutable { bvi->adj_ -= vi.adj_; });
+      [bvi = b.vi_](const auto& vi) mutable { bvi->adj_ -= vi.adj_; });
 }
 
 /**

stan/math/rev/core/precomputed_gradients.hpp

@@ -80,10 +80,10 @@ class precomputed_gradients_vari_template : public vari {
         size_(size),
         varis_(varis),
         gradients_(gradients),
-        container_operands_(index_apply<N_containers>([&, this](auto... Is) {
+        container_operands_(index_apply<N_containers>([&](auto... Is) {
           return std::make_tuple(to_arena(std::get<Is>(container_operands))...);
         })),
-        container_gradients_(index_apply<N_containers>([&, this](auto... Is) {
+        container_gradients_(index_apply<N_containers>([&](auto... Is) {
           return std::make_tuple(
               to_arena(std::get<Is>(container_gradients))...);
         })) {
@@ -123,10 +123,10 @@ class precomputed_gradients_vari_template : public vari {
             vars.size())),
         gradients_(ChainableStack::instance_->memalloc_.alloc_array<double>(
             vars.size())),
-        container_operands_(index_apply<N_containers>([&, this](auto... Is) {
+        container_operands_(index_apply<N_containers>([&](auto... Is) {
           return std::make_tuple(to_arena(std::get<Is>(container_operands))...);
         })),
-        container_gradients_(index_apply<N_containers>([&, this](auto... Is) {
+        container_gradients_(index_apply<N_containers>([&](auto... Is) {
           return std::make_tuple(
               to_arena(std::get<Is>(container_gradients))...);
         })) {

stan/math/rev/core/set_zero_all_adjoints_nested.hpp

@@ -17,7 +17,7 @@ namespace math {
  * It is preferred to use the <code>nested_rev_autodiff</code> class for
  * nested autodiff class as it handles recovery of memory automatically.
  */
-static void set_zero_all_adjoints_nested() {
+static inline void set_zero_all_adjoints_nested() {
   if (empty_nested()) {
     throw std::logic_error(
         "empty_nested() must be false before calling"

stan/math/rev/core/vari.hpp

@@ -848,7 +848,7 @@ class vari_value<T, require_eigen_sparse_base_t<T>> : public vari_base,
    */
   template <typename S, require_convertible_t<S&, T>* = nullptr>
   explicit vari_value(S&& x)
-      : adj_(x), val_(std::forward<S>(x)), chainable_alloc() {
+      : chainable_alloc(), adj_(x), val_(std::forward<S>(x)) {
     this->set_zero_adjoint();
     ChainableStack::instance_->var_stack_.push_back(this);
   }
@@ -871,7 +871,7 @@ class vari_value<T, require_eigen_sparse_base_t<T>> : public vari_base,
    */
   template <typename S, require_convertible_t<S&, T>* = nullptr>
   vari_value(S&& x, bool stacked)
-      : adj_(x), val_(std::forward<S>(x)), chainable_alloc() {
+      : chainable_alloc(), adj_(x), val_(std::forward<S>(x)) {
     this->set_zero_adjoint();
     if (stacked) {
       ChainableStack::instance_->var_stack_.push_back(this);

stan/math/rev/fun/beta.hpp

@@ -66,10 +66,9 @@ inline var beta(const var& a, const var& b) {
  */
 inline var beta(const var& a, double b) {
   auto digamma_ab = digamma(a.val()) - digamma(a.val() + b);
-  return make_callback_var(beta(a.val(), b),
-                           [a, b, digamma_ab](auto& vi) mutable {
-                             a.adj() += vi.adj() * digamma_ab * vi.val();
-                           });
+  return make_callback_var(beta(a.val(), b), [a, digamma_ab](auto& vi) mutable {
+    a.adj() += vi.adj() * digamma_ab * vi.val();
+  });
 }
 
 /**
@@ -180,10 +179,9 @@ inline auto beta(const Scalar& a, const VarMat& b) {
     auto digamma_ab = to_arena((digamma(arena_b.val()).array()
                                 - digamma(arena_a + arena_b.val().array()))
                                * beta_val.array());
-    return make_callback_var(
-        beta_val, [arena_a, arena_b, digamma_ab](auto& vi) mutable {
-          arena_b.adj().array() += vi.adj().array() * digamma_ab.array();
-        });
+    return make_callback_var(beta_val, [arena_b, digamma_ab](auto& vi) mutable {
+      arena_b.adj().array() += vi.adj().array() * digamma_ab.array();
+    });
   }
 }
 
@@ -210,12 +208,11 @@ inline auto beta(const VarMat& a, const Scalar& b) {
     double arena_b = value_of(b);
     auto digamma_ab = to_arena(digamma(arena_a.val()).array()
                                - digamma(arena_a.val().array() + arena_b));
-    return make_callback_var(beta(arena_a.val(), arena_b),
-                             [arena_a, arena_b, digamma_ab](auto& vi) mutable {
-                               arena_a.adj().array() += vi.adj().array()
-                                                        * digamma_ab
-                                                        * vi.val().array();
-                             });
+    return make_callback_var(
+        beta(arena_a.val(), arena_b), [arena_a, digamma_ab](auto& vi) mutable {
+          arena_a.adj().array()
+              += vi.adj().array() * digamma_ab * vi.val().array();
+        });
   } else if (!is_constant<Scalar>::value) {
     arena_t<promote_scalar_t<double, VarMat>> arena_a = value_of(a);
     var arena_b = b;