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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.
This commit is contained in:
Jonathan Wakely 2022-06-28 09:17:06 +01:00
parent 10caa98a37
commit 30aea28bd3
1 changed files with 2 additions and 0 deletions
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libstdc++-v3/testsuite/20_util/from_chars/4.cc
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@ -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;