[gcc r12-8593] libstdc++: testsuite: Guard use of C99 std::log2
Jonathan Wakely
redi@gcc.gnu.org
Thu Jul 21 11:16:44 GMT 2022
https://gcc.gnu.org/g:c19fe8ad4e2816b181e5d5d3757f1ad59c86cdca
commit r12-8593-gc19fe8ad4e2816b181e5d5d3757f1ad59c86cdca
Author: Jonathan Wakely <jwakely@redhat.com>
Date: Tue Jun 28 09:17:06 2022 +0100
libstdc++: testsuite: Guard use of C99 std::log2
This prevents the test from failing if the only thing not supported is
the text printed to the log about the size of the floating-point type.
libstdc++-v3/ChangeLog:
* testsuite/20_util/from_chars/4.cc: Only use log2 if C99 math
functions are available.
(cherry picked from commit 30aea28bd30027e0a6be8e3077828256779954b3)
Diff:
---
libstdc++-v3/testsuite/20_util/from_chars/4.cc | 2 ++
1 file changed, 2 insertions(+)
diff --git a/libstdc++-v3/testsuite/20_util/from_chars/4.cc b/libstdc++-v3/testsuite/20_util/from_chars/4.cc
index dcd9f97c946..c27df4ffa5e 100644
--- a/libstdc++-v3/testsuite/20_util/from_chars/4.cc
+++ b/libstdc++-v3/testsuite/20_util/from_chars/4.cc
@@ -300,9 +300,11 @@ test_max_mantissa()
if (Float_limits::is_iec559 && Float_limits::digits < UInt_limits::digits)
{
+#ifdef _GLIBCXX_USE_C99_MATH_TR1
std::printf("Testing %d-bit float, using %zu-bit integer\n",
Float_limits::digits + (int)std::log2(Float_limits::max_exponent) + 1,
sizeof(UIntT) * __CHAR_BIT__);
+#endif
std::from_chars_result res;
FloatT flt;
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