Add export ZERO_AR_DATE=1 to libtool.sh to make the output hermetic, and touch the output of libtool to avoid hitting a bug in ld.

--
MOS_MIGRATED_REVID=130093791

1 files changed, 31 insertions, 0 deletions

diff --git a/src/test/shell/bazel/bazel_objc_test.sh b/src/test/shell/bazel/bazel_objc_test.sh
index 125392cb00..fc8bdfd9f6 100755
--- a/src/test/shell/bazel/bazel_objc_test.sh
+++ b/src/test/shell/bazel/bazel_objc_test.sh
@@ -179,4 +179,35 @@ EOF
       || fail "should be able to resolve xcode-locator"
 }
 
+# Verifies contents of .a files do not contain timestamps -- if they did, the
+# results would not be hermetic.
+function test_archive_timestamps() {
+  mkdir -p objclib
+  cat > objclib/BUILD <<EOF
+objc_library(
+    name = "objclib",
+    srcs = ["mysrc.m"],
+)
+EOF
+
+  cat > objclib/mysrc.m <<EOF
+int aFunction() {
+  return 0;
+}
+EOF
+
+  bazel build --verbose_failures //objclib:objclib >"$TEST_log" 2>&1 || \
+      fail "Should build objc_library"
+
+  # Based on timezones, ar -tv may show the timestamp of the contents as either
+  # Dec 31 1969 or Jan 1 1970 -- either is fine.
+  # We would use 'date' here, but the format is slightly different (Jan 1 vs.
+  # Jan 01).
+  ar -tv bazel-bin/objclib/libobjclib.a \
+      | grep "mysrc" | grep "Dec 31" | grep "1969" \
+      || ar -tv bazel-bin/objclib/libobjclib.a \
+      | grep "mysrc" | grep "Jan  1" | grep "1970" || \
+      fail "Timestamp of contents of archive file should be zero"
+}
+
 run_suite "objc/ios test suite"