Add CMake option for removing unicode from logging messages.

CMakeLists.txt

@@ -74,6 +74,7 @@ endif()
 
 # Polysolve options
 option(POLYSOLVE_WITH_SANITIZERS    "Enable sanitizers in compilation targets"          OFF)
+option(POLYSOLVE_WITH_UNICODE       "Use Unicode in logging messages"                    ON)
 
 # Polysolve options for enabling/disabling optional libraries
 option(POLYSOLVE_WITH_ACCELERATE    "Enable Apple Accelerate" ${POLYSOLVE_ON_APPLE_SILICON})
@@ -322,6 +323,14 @@ endif()
 include(polysolve_warnings)
 target_link_libraries(polysolve_linear PRIVATE polysolve::warnings)
 
+# Unicode
+if(POLYSOLVE_WITH_UNICODE)
+    target_compile_definitions(polysolve_linear PUBLIC POLYSOLVE_WITH_UNICODE)
+    if(MSVC)
+        target_compile_options(polysolve_linear PUBLIC /utf-8)
+    endif()
+endif()
+
 # ---------
 # Nonlinear
 # ---------

src/polysolve/Utils.hpp

@@ -1,4 +1,4 @@
-#pragma once
+#pragma once
 
 #include "Types.hpp"
 
@@ -62,4 +62,24 @@ namespace polysolve
 
     double extract_param(const std::string &key, const std::string &name, const json &json);
 
+    namespace log
+    {
+#ifdef POLYSOLVE_WITH_UNICODE
+        inline std::string f0() { return "f₀"; }
+        inline std::string dot() { return "⋅"; }
+        inline std::string ge() { return "≥"; }
+        inline std::string delta(const std::string &x) { return std::string("Δ") + x; }
+        inline std::string norm(const std::string &x) { return std::string("‖") + x + "‖"; }
+        inline std::string grad(const std::string &x) { return std::string("∇") + x; }
+#else
+        inline std::string f0() { return "f0"; }
+        inline std::string dot() { return "*"; }
+        inline std::string ge() { return ">="; }
+        inline std::string delta(const std::string &x) { return std::string("d") + x; }
+        inline std::string norm(const std::string &x) { return std::string("norm(") + x + ")"; }
+        inline std::string grad(const std::string &x) { return std::string("grad(") + x + ")"; }
+#endif // POLYSOLVE_WITH_UNICODE
+
+    } // namespace log
+
 } // namespace polysolve

src/polysolve/nonlinear/Criteria.cpp

@@ -3,6 +3,7 @@
 #include "Criteria.hpp"
 
 #include <spdlog/fmt/fmt.h>
+#include <polysolve/Utils.hpp>
 
 namespace polysolve::nonlinear
 {
@@ -33,8 +34,12 @@ namespace polysolve::nonlinear
     }
     std::string Criteria::print_message() const {
         return fmt::format(
-            "iters={:d} Δf={:g} ‖∇f‖={:g} ‖Δx‖={:g} Δx⋅∇f(x)={:g}",
-            iterations, fDelta, gradNorm, xDelta, xDeltaDotGrad);
+            "iters={:d} {}={:g} {}={:g} {}={:g} {}={:g}",
+            iterations,
+            log::delta("f"), fDelta,
+            log::norm(log::grad("f")), gradNorm,
+            log::norm(log::delta("x")), xDelta,
+            log::delta("x") + log::dot() + log::grad("f(x)"), xDeltaDotGrad);
     }
 
     Status checkConvergence(const Criteria &stop, const Criteria &current)

src/polysolve/nonlinear/Solver.cpp

@@ -282,8 +282,8 @@ namespace polysolve::nonlinear
         stop_watch.start();
 
         m_logger.debug(
-            "Starting {} with {} solve f₀={:g} (stopping criteria: {})",
-            descent_strategy_name(), m_line_search->name(), objFunc(x), m_stop.print_message());
+            "Starting {} with {} solve {}={:g} (stopping criteria: {})",
+            descent_strategy_name(), m_line_search->name(), log::f0(), objFunc(x), m_stop.print_message());
 
         update_solver_info(objFunc(x));
         objFunc.post_step(PostStepData(m_current.iterations, solver_info, x, grad));
@@ -377,17 +377,21 @@ namespace polysolve::nonlinear
                 {
                     m_status = Status::NotDescentDirection;
                     log_and_throw_error(
-                        m_logger, "[{}][{}] {} on last strategy (‖Δx‖={:g}; ‖g‖={:g}; Δx⋅g={:g}≥0); stopping",
-                        current_name, m_line_search->name(), status_message(m_status), delta_x.norm(), compute_grad_norm(x, grad),
-                        m_current.xDeltaDotGrad);
+                        m_logger, "[{}][{}] {} on last strategy ({}={:g}; {}={:g}; {}={:g}≥0); stopping",
+                        current_name, m_line_search->name(), status_message(m_status),
+                        log::norm(log::delta("x")), delta_x.norm(),
+                        log::norm("g"), compute_grad_norm(x, grad),
+                        log::delta("x") + log::dot() + "g", m_current.xDeltaDotGrad);
                 }
                 else
                 {
                     m_status = Status::Continue;
                     m_logger.debug(
-                        "[{}][{}] {} (‖Δx‖={:g}; ‖g‖={:g}; Δx⋅g={:g}≥0); reverting to {}",
+                        "[{}][{}] {} ({}={:g}; {}={:g}; {}={:g}{}0); reverting to {}",
                         current_name, m_line_search->name(), status_message(Status::NotDescentDirection),
-                        delta_x.norm(), compute_grad_norm(x, grad), m_current.xDeltaDotGrad,
+                        log::norm(log::delta("x")), delta_x.norm(),
+                        log::norm("g"), compute_grad_norm(x, grad),
+                        log::delta("x") + log::dot() + "g", m_current.xDeltaDotGrad, log::ge(),
                         descent_strategy_name());
                 }
                 continue;
@@ -403,9 +407,9 @@ namespace polysolve::nonlinear
             // --- Variable update ---------------------------------------------
 
             m_logger.trace(
-                "[{}][{}] pre LS iter={:d} f={:g} ‖∇f‖={:g}",
+                "[{}][{}] pre LS iter={:d} f={:g} {}={:g}",
                 descent_strategy_name(), m_line_search->name(),
-                m_current.iterations, energy, m_current.gradNorm);
+                m_current.iterations, energy, log::norm(log::grad("f")), m_current.gradNorm);
 
             // Perform a line_search to compute step scale
             double rate;

src/polysolve/nonlinear/line_search/Backtracking.cpp

@@ -52,7 +52,7 @@ namespace polysolve::nonlinear::line_search
                 continue;
             }
 
-            m_logger.trace("ls it: {} ΔE: {}", cur_iter, new_energy - old_energy);
+            m_logger.trace("ls it: {} {}: {}", cur_iter, log::delta("E"), new_energy - old_energy);
 
             if (criteria(delta_x, objFunc, use_grad_norm, old_energy, old_grad, new_x, new_energy, step_size))
             {