avoid double promotions

src/systemcmds/tests/test_float.cpp

@@ -1,15 +1,7 @@
 #include <unit_test/unit_test.h>
 
-#include <errno.h>
-#include <fcntl.h>
-#include <float.h>
-#include <math.h>
 #include <px4_config.h>
-#include <stdint.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <sys/types.h>
-#include <unistd.h>
+#include <cfloat>
 
 typedef union {
 	float f;
@@ -33,7 +25,7 @@ bool FloatTest::singlePrecisionTests()
 {
 	float sinf_zero = sinf(0.0f);
 	float sinf_one = sinf(1.0f);
-	float sqrt_two = sqrt(2.0f);
+	float sqrt_two = sqrtf(2.0f);
 
 	ut_assert("sinf(0.0f) == 0.0f", fabsf(sinf_zero) < FLT_EPSILON);
 	ut_assert("sinf(1.0f) == 0.84147f", fabsf((sinf_one - 0.841470956802368164062500000000f)) < FLT_EPSILON);

src/systemcmds/tests/test_matrix.cpp

@@ -64,9 +64,11 @@ using matrix::Quatf;
 using matrix::Eulerf;
 using matrix::Vector3f;
 
+using std::fabs;
+
 bool MatrixTest::attitudeTests()
 {
-	double eps = 1e-6;
+	float eps = 1e-6;
 
 	// check data
 	Eulerf euler_check(0.1f, 0.2f, 0.3f);
@@ -207,8 +209,9 @@ bool MatrixTest::attitudeTests()
 	Quatf q_from_m(m4);
 	ut_test(isEqual(q_from_m, m4));
 
-	// quaternion derivate
+	// quaternion derivative
 	Vector<float, 4> q_dot = q.derivative1(Vector3f(1, 2, 3));
+	(void)q_dot;
 
 	// quaternion product
 	Quatf q_prod_check(0.93394439f, 0.0674002f, 0.20851f, 0.28236266f);