Update system_error tests for more platforms.

[mclow.lists]

test/std/diagnostics/syserr/syserr.errcat/syserr.errcat.objects/generic_category.pass.cpp

35 ↗

(On Diff #107704)

How about testing for "starts with 'Unknown error'" instead?

[danalbert]

PTAL

libcxx/test/std/diagnostics/syserr/syserr.errcat/syserr.errcat.objects/generic_category.pass.cpp

 #include <cerrno>
 
 #include "test_macros.h"
 
 void test_message_for_bad_value() {
     errno = E2BIG; // something that message will never generate
     const std::error_category& e_cat1 = std::generic_category();
     const std::string msg = e_cat1.message(-1);
-    LIBCPP_ASSERT(msg == "Unknown error -1" || msg == "Unknown error");
+    // Exact message format varies by platform.
+    LIBCPP_ASSERT(msg.starts_with("Unknown error"));
     assert(errno == E2BIG);
 }
 
 int main(int, char**)
 {
     const std::error_category& e_cat1 = std::generic_category();
     std::string m1 = e_cat1.name();
     assert(m1 == "generic");
     {
         test_message_for_bad_value();
     }
 
   return 0;
 }

libcxx/test/std/diagnostics/syserr/syserr.errcat/syserr.errcat.objects/system_category.pass.cpp

 #include <cerrno>
 
 #include "test_macros.h"
 
 void test_message_for_bad_value() {
     errno = E2BIG; // something that message will never generate
     const std::error_category& e_cat1 = std::system_category();
     const std::string msg = e_cat1.message(-1);
-    LIBCPP_ASSERT(msg == "Unknown error -1" || msg == "Unknown error");
+    // Exact message format varies by platform.
+    LIBCPP_ASSERT(msg.starts_with("Unknown error"));
     assert(errno == E2BIG);
 }
 
 int main(int, char**)
 {
     const std::error_category& e_cat1 = std::system_category();
     std::error_condition e_cond = e_cat1.default_error_condition(5);
     assert(e_cond.value() == 5);