check-software-div: Add a new build check for software divide

Update the build checks to include a check for unexpected software
divide operations.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

scripts/check-software-div.sh

@@ -0,0 +1,22 @@
+#!/bin/bash
+# Check if a binary appears to have a software library divide operator
+
+CFGFILE="$1"
+ELFOBJ="$2"
+OBJDUMP=objdump
+
+objdump -t ${ELFOBJ} | grep -Eq '\<(__[a-z0-9]*div|__[a-z0-9]*mod)'
+if [ $? -eq 0 ]; then
+
+    if grep -Eq '^CONFIG_HAVE_SOFTWARE_DIVIDE_REQUIRED=y$' ${CFGFILE}; then
+        echo ""
+        echo "Software divide detected and that is normal for this chip"
+        echo ""
+        exit 0
+    fi
+
+    echo ""
+    echo "ERROR: A software run-time divide operation was found"
+    echo ""
+    exit 99
+fi

scripts/ci-build.sh

@@ -56,6 +56,7 @@ for TARGET in test/configs/*.config ; do
     make olddefconfig
     make V=1
     size out/*.elf
+    ./scripts/check-software-div.sh .config out/*.elf
     finish_test mcu_compile "$TARGET"
     cp out/klipper.dict ${DICTDIR}/$(basename ${TARGET} .config).dict
 done