[libcxx] r315874 - Silence clang's -Wtautological-constant-compare in last_write_time.pass.cpp

[Roman Lebedev via cfe-commits]

Author: lebedevri
Date: Sun Oct 15 13:12:42 2017
New Revision: 315874

URL: http://llvm.org/viewvc/llvm-project?rev=315874&view=rev
Log:
Silence clang's -Wtautological-constant-compare in last_write_time.pass.cpp

Previously this broke the builders, when D38101 was committed.
Silence the warning so that it can be re-landed.

Modified:
    libcxx/trunk/test/std/experimental/filesystem/fs.op.funcs/fs.op.last_write_time/last_write_time.pass.cpp

Modified: libcxx/trunk/test/std/experimental/filesystem/fs.op.funcs/fs.op.last_write_time/last_write_time.pass.cpp
URL: http://llvm.org/viewvc/llvm-project/libcxx/trunk/test/std/experimental/filesystem/fs.op.funcs/fs.op.last_write_time/last_write_time.pass.cpp?rev=315874&r1=315873&r2=315874&view=diff
==============================================================================
--- libcxx/trunk/test/std/experimental/filesystem/fs.op.funcs/fs.op.last_write_time/last_write_time.pass.cpp (original)
+++ libcxx/trunk/test/std/experimental/filesystem/fs.op.funcs/fs.op.last_write_time/last_write_time.pass.cpp Sun Oct 15 13:12:42 2017
@@ -88,6 +88,13 @@ bool TestSupportsNegativeTimes() {
     return !ec && new_write_time <= -5;
 }
 
+// In some configurations, the comparison is tautological and the test is valid.
+// We disable the warning so that we can actually test it regardless.
+#if defined(__clang__)
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wtautological-constant-compare"
+#endif
+
 bool TestSupportsMaxTime() {
     using namespace std::chrono;
     using Lim = std::numeric_limits<std::time_t>;
@@ -106,11 +113,22 @@ bool TestSupportsMaxTime() {
     return !ec && new_write_time > max_sec - 1;
 }
 
+#if defined(__clang__)
+#pragma clang diagnostic pop
+#endif
+
 static const bool SupportsNegativeTimes = TestSupportsNegativeTimes();
 static const bool SupportsMaxTime = TestSupportsMaxTime();
 
 } // end namespace
 
+// In some configurations, the comparison is tautological and the test is valid.
+// We disable the warning so that we can actually test it regardless.
+#if defined(__clang__)
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wtautological-constant-compare"
+#endif
+
 // Check if a time point is representable on a given filesystem. Check that:
 // (A) 'tp' is representable as a time_t
 // (B) 'tp' is non-negative or the filesystem supports negative times.
@@ -127,6 +145,10 @@ inline bool TimeIsRepresentableByFilesys
     return true;
 }
 
+#if defined(__clang__)
+#pragma clang diagnostic pop
+#endif
+
 TEST_SUITE(exists_test_suite)
 
 TEST_CASE(signature_test)