Disable negative NaN float ostream format checking on RISC-V

It’s not clear whether negative NaN floats are supposed to print as
"-nan" or "nan" on RISC-V (https://cplusplus.github.io/LWG/issue4101).
Until that’s resolved, don’t require that logging such a float with
Abseil produce the same result as streaming it to an ostream does.

Closes: https://github.com/abseil/abseil-cpp/issues/1684
PiperOrigin-RevId: 641942176
Change-Id: Iec7ef130cc15c114714f2d124cb37886b3c37ab4

1 files changed, 14 insertions, 0 deletions

diff --git a/absl/log/log_format_test.cc b/absl/log/log_format_test.cc
index dbad5d97..8ca6df3e 100644
--- a/absl/log/log_format_test.cc
+++ b/absl/log/log_format_test.cc
@@ -608,6 +608,19 @@ TYPED_TEST(FloatingPointLogFormatTest, NegativeNaN) {
   auto comparison_stream = ComparisonStream();
   comparison_stream << value;
 
+  // On RISC-V, don't expect that formatting -NaN produces the same string as
+  // streaming it. #ifdefing out just the relevant line breaks the MSVC build,
+  // so duplicate the entire EXPECT_CALL.
+#ifdef __riscv
+  EXPECT_CALL(
+      test_sink,
+      Send(AllOf(
+          TextMessage(AnyOf(Eq("-nan"), Eq("nan"), Eq("NaN"), Eq("-nan(ind)"))),
+          ENCODED_MESSAGE(
+              AnyOf(EqualsProto(R"pb(value { str: "-nan" })pb"),
+                    EqualsProto(R"pb(value { str: "nan" })pb"),
+                    EqualsProto(R"pb(value { str: "-nan(ind)" })pb"))))));
+#else
   EXPECT_CALL(
       test_sink,
       Send(AllOf(
@@ -617,6 +630,7 @@ TYPED_TEST(FloatingPointLogFormatTest, NegativeNaN) {
               AnyOf(EqualsProto(R"pb(value { str: "-nan" })pb"),
                     EqualsProto(R"pb(value { str: "nan" })pb"),
                     EqualsProto(R"pb(value { str: "-nan(ind)" })pb"))))));
+#endif
   test_sink.StartCapturingLogs();
   LOG(INFO) << value;
 }