[wpimath] Explicitly export wpimath symbols

Co-authored-by: Tyler Veness <calcmogul@gmail.com>

wpimath/src/main/native/include/frc/geometry/Pose2d.h

@@ -4,6 +4,8 @@
 
 #pragma once
 
+#include <wpi/SymbolExports.h>
+
 #include "Transform2d.h"
 #include "Translation2d.h"
 #include "Twist2d.h"
@@ -17,7 +19,7 @@ namespace frc {
 /**
  * Represents a 2d pose containing translational and rotational elements.
  */
-class Pose2d {
+class WPILIB_DLLEXPORT Pose2d {
  public:
   /**
    * Constructs a pose at the origin facing toward the positive X axis.
@@ -171,8 +173,10 @@ class Pose2d {
   Rotation2d m_rotation;
 };
 
+WPILIB_DLLEXPORT
 void to_json(wpi::json& json, const Pose2d& pose);
 
+WPILIB_DLLEXPORT
 void from_json(const wpi::json& json, Pose2d& pose);
 
 }  // namespace frc

wpimath/src/main/native/include/frc/geometry/Rotation2d.h

@@ -4,6 +4,8 @@
 
 #pragma once
 
+#include <wpi/SymbolExports.h>
+
 #include "units/angle.h"
 
 namespace wpi {
@@ -16,7 +18,7 @@ namespace frc {
  * A rotation in a 2d coordinate frame represented a point on the unit circle
  * (cosine and sine).
  */
-class Rotation2d {
+class WPILIB_DLLEXPORT Rotation2d {
  public:
   /**
    * Constructs a Rotation2d with a default angle of 0 degrees.
@@ -160,8 +162,10 @@ class Rotation2d {
   double m_sin = 0;
 };
 
+WPILIB_DLLEXPORT
 void to_json(wpi::json& json, const Rotation2d& rotation);
 
+WPILIB_DLLEXPORT
 void from_json(const wpi::json& json, Rotation2d& rotation);
 
 }  // namespace frc

wpimath/src/main/native/include/frc/geometry/Transform2d.h

@@ -4,16 +4,18 @@
 
 #pragma once
 
+#include <wpi/SymbolExports.h>
+
 #include "Translation2d.h"
 
 namespace frc {
 
-class Pose2d;
+class WPILIB_DLLEXPORT Pose2d;
 
 /**
  * Represents a transformation for a Pose2d.
  */
-class Transform2d {
+class WPILIB_DLLEXPORT Transform2d {
  public:
   /**
    * Constructs the transform that maps the initial pose to the final pose.

wpimath/src/main/native/include/frc/geometry/Translation2d.h

@@ -4,6 +4,8 @@
 
 #pragma once
 
+#include <wpi/SymbolExports.h>
+
 #include "Rotation2d.h"
 #include "units/length.h"
 
@@ -21,7 +23,7 @@ namespace frc {
  * When the robot is placed on the origin, facing toward the X direction,
  * moving forward increases the X, whereas moving to the left increases the Y.
  */
-class Translation2d {
+class WPILIB_DLLEXPORT Translation2d {
  public:
   /**
    * Constructs a Translation2d with X and Y components equal to zero.
@@ -175,8 +177,10 @@ class Translation2d {
   units::meter_t m_y = 0_m;
 };
 
+WPILIB_DLLEXPORT
 void to_json(wpi::json& json, const Translation2d& state);
 
+WPILIB_DLLEXPORT
 void from_json(const wpi::json& json, Translation2d& state);
 
 }  // namespace frc

wpimath/src/main/native/include/frc/geometry/Twist2d.h

@@ -4,6 +4,8 @@
 
 #pragma once
 
+#include <wpi/SymbolExports.h>
+
 #include "units/angle.h"
 #include "units/length.h"
 #include "units/math.h"
@@ -16,7 +18,7 @@ namespace frc {
  *
  * A Twist can be used to represent a difference between two poses.
  */
-struct Twist2d {
+struct WPILIB_DLLEXPORT Twist2d {
   /**
    * Linear "dx" component
    */