build_system_tests.sh: Replace use of second-precision-only [ a -ot b ]

diff --git a/make/build_system_tests.sh b/make/build_system_tests.sh
index 5824cf2b8e3a7c168bf755848687c337ea592b1c..b361e0b8ee03f59eeb716776786ef9a72e3b0aa0 100755 (executable)
--- a/make/build_system_tests.sh
+++ b/make/build_system_tests.sh
@@ -131,6 +131,18 @@ function assert_built()
        done
 }
 
+# Test if a file has been rebuilt.
+function file_was_rebuilt()
+{
+       # can't use [ a -ot b ] here as -ot only gives second resolution
+       # but stat -c %y seems to be microsecond at least for tmpfs, ext4..
+       if [ "$(stat -c %y ${SNAPSHOT}/$1)" != "$(stat -c %y ${BUILD}/$1)" ]; then
+               return 0
+       else
+               return 1
+       fi
+}
+
 # verify all the arguments passed in were rebuilt relative to the snapshot
 function assert_rebuilt()
 {
@@ -139,7 +151,7 @@ function assert_rebuilt()
                if [ ! -f "${SNAPSHOT}/$1" ]; then
                        failure "File $1 should have been original build snapshot"
                fi
-               if [ ! "${SNAPSHOT}/$1" -ot "${BUILD}/$1" ]; then
+               if ! file_was_rebuilt "$1"; then
                        failure "File $1 should have been rebuilt"
                fi
                shift
@@ -155,7 +167,7 @@ function assert_not_rebuilt()
                if [ ! -f "${SNAPSHOT}/$1" ]; then
                        failure "File $1 should be in snapshot build directory"
                fi
-               if [ "${SNAPSHOT}/$1" -ot "${BUILD}/$1" ]; then
+               if file_was_rebuilt "$1"; then
                        failure "File $1 should not have been rebuilt"
                fi
                shift