Fix usage of GCC extension before C++23

Author: ProfFan

gtsam/discrete/DiscreteBayesNet.cpp

@@ -60,11 +60,8 @@ DiscreteValues DiscreteBayesNet::optimize() const {
 
 DiscreteValues DiscreteBayesNet::optimize(DiscreteValues result) const {
   // solve each node in turn in topological sort order (parents first)
-#ifdef _MSC_VER
 #pragma message("DiscreteBayesNet::optimize (deprecated) does not compute MPE!")
-#else
-#warning "DiscreteBayesNet::optimize (deprecated) does not compute MPE!"
-#endif
+
   for (auto conditional : boost::adaptors::reverse(*this))
     conditional->solveInPlace(&result);
   return result;

gtsam/slam/BearingFactor.h

@@ -11,11 +11,7 @@
 
 #pragma once
 
-#ifdef _MSC_VER
 #pragma message("BearingFactor is now an ExpressionFactor in SAM directory")
-#else
-#warning "BearingFactor is now an ExpressionFactor in SAM directory"
-#endif
 
 
 #include <gtsam/sam/BearingFactor.h>

gtsam/slam/BearingRangeFactor.h

@@ -11,11 +11,8 @@
 
 #pragma once
 
-#ifdef _MSC_VER
 #pragma message( \
     "BearingRangeFactor is now an ExpressionFactor in SAM directory")
-#else
-#warning "BearingRangeFactor is now an ExpressionFactor in SAM directory"
-#endif
+
 
 #include <gtsam/sam/BearingRangeFactor.h>

gtsam/slam/RangeFactor.h

@@ -11,12 +11,7 @@
 
 #pragma once
 
-#ifdef _MSC_VER
 #pragma message("RangeFactor is now an ExpressionFactor in SAM directory")
-#else
-#warning "RangeFactor is now an ExpressionFactor in SAM directory"
-#endif
-
 
 #include <gtsam/sam/RangeFactor.h>