Don't fail build on 1-core-VM

When `expr` returns a result of '0', it sets the return code to 1. `eval` just passes that through and that fails the build there on 1-core-VMs.

rocsolver.changes

@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Thu Nov 20 07:35:23 UTC 2025 - Bernhard Wiedemann <bwiedemann@suse.de>
+
+- Don't fail build on 1-core-VM
+
 -------------------------------------------------------------------
 Tue Nov 11 14:48:08 UTC 2025 - Tom Rix <Tom.Rix@amd.com>
 

rocsolver.spec

@@ -233,7 +233,9 @@ if [ ${HIP_JOBS} = 1 ]; then
         HIP_JOBS=4
     fi
 fi
-HIP_JOBS=`eval "expr ${HIP_JOBS} / 2"`
+if [ ${HIP_JOBS} != 1 ] ; then
+    HIP_JOBS=`expr ${HIP_JOBS} / 2`
+fi
 
 # Take into account memmory usage per core, do not thrash real memory
 BUILD_MEM=32