more linux and init for valgrind of example

Author: galabovaa

.github/workflows/hipo-ubuntu.yml

@@ -36,14 +36,16 @@ jobs:
       - name: Install GKLIB
         run: |
           cd GKlib
+          make clean
           make config ccopts=-fPIC prefix=${{runner.workspace}}/installs
           make
           make install
 
       - name: Install METIS
         run: |
           cd METIS
-          make config prefix=${{runner.workspace}}/installs
+          make clean
+          make config prefix=${{runner.workspace}}/installs gklib_path=../GKlib
           make
           make install
 
@@ -121,14 +123,16 @@ jobs:
       - name: Install GKLIB
         run: |
           cd GKlib
+          make clean
           make config ccopts=-fPIC prefix=${{runner.workspace}}/installs
           make
           make install
 
       - name: Install METIS
         run: |
           cd METIS
-          make config prefix=${{runner.workspace}}/installs 
+          make clean
+          make config prefix=${{runner.workspace}}/installs gklib_path=../GKlib
           make
           make install
 

highs/lp_data/HighsSolve.cpp

@@ -603,7 +603,10 @@ bool useHipo(const HighsOptions& options,
                                                      : options.mip_ipm_solver;
   // In the MIP solver there are situations where IPM must be used
   const bool force_ipm = specific_solver_option == kMipIpmSolverString;
-  bool use_hipo;
+
+  // Initialize to value for valgrind.
+  bool use_hipo = false;
+
   if (specific_solver_option_value == kIpxString) {
     use_hipo = false;
   } else if (specific_solver_option_value == kIpmString ||