libstdc++: Workaround buggy printf on Solaris in to_chars/float128_c++23.cc test [PR107815]
As mentioned in the PR, Solaris apparently can handle right
printf ("%.0Lf\n", 1e+202L * __DBL_MAX__);
which prints 511 chars long number, but can't handle
printf ("%.0Lf\n", 1e+203L * __DBL_MAX__);
nor
printf ("%.0Lf\n", __LDBL_MAX__);
properly, instead of printing 512 chars long number for the former and
4933 chars long number for the second, it handles them as
if user asked for "%.0Le\n" in those cases.
The following patch disables the single problematic value that fails
in the test, and also fixes commented out debugging printouts.
2022-11-24 Jakub Jelinek <jakub@redhat.com>
PR libstdc++/107815
* testsuite/20_util/to_chars/float128_c++23.cc (test): Disable
__FLT128_MAX__ test on Solaris. Fix up commented out debugging
printouts.
diff --git a/libstdc++-v3/testsuite/20_util/to_chars/float128_c++23.cc b/libstdc++-v3/testsuite/20_util/to_chars/float128_c++23.cc
index 28824c9..735a507 100644
--- a/libstdc++-v3/testsuite/20_util/to_chars/float128_c++23.cc
+++ b/libstdc++-v3/testsuite/20_util/to_chars/float128_c++23.cc
@@ -52,14 +52,17 @@
std::numbers::inv_sqrt3_v<std::float128_t>,
std::numbers::egamma_v<std::float128_t>,
std::numbers::phi_v<std::float128_t>,
+// Solaris has non-conforming printf, see PR98384 and PR107815.
+#if !(defined(__sun__) && defined(__svr4__))
std::numeric_limits<std::float128_t>::max()
+#endif
};
char str1[10000], str2[10000];
for (auto u : tests)
{
auto [ptr1, ec1] = std::to_chars(str1, str1 + sizeof(str1), u, fmt);
VERIFY( ec1 == std::errc() );
-// std::cout << i << ' ' << std::string_view (str1, ptr1) << '\n';
+// std::cout << u << ' ' << std::string_view (str1, ptr1) << '\n';
if (fmt == std::chars_format::fixed)
{
auto [ptr2, ec2] = std::to_chars(str2, str2 + (ptr1 - str1), u, fmt);
@@ -76,7 +79,7 @@
auto [ptr5, ec5] = std::to_chars(str1, str1 + sizeof(str1), u, fmt, 90);
VERIFY( ec5 == std::errc() );
-// std::cout << i << ' ' << std::string_view (str1, ptr5) << '\n';
+// std::cout << u << ' ' << std::string_view (str1, ptr5) << '\n';
v = 4.0f128;
auto [ptr6, ec6] = std::from_chars(str1, ptr5, v,
fmt == std::chars_format{}
