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libstdc++: Make __from_chars_alnum_to_val conversion explicit

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The optimizations from commit r12-8175-ga54137c88061c7 introduced a
clang integer sanitizer error.

Fix this with an explicit static_cast, similar to the fix for PR 96766.

libstdc++-v3/ChangeLog:

	* include/std/charconv (__from_chars_alnum_to_val): Replace
	implicit conversion from int to unsigned char with explicit
	cast.

(cherry picked from commit 20ab397224)
This commit is contained in:
Marco Falke 2022-07-19 10:10:39 +01:00 committed by Jonathan Wakely
parent f3ff78e3db
commit 0bb30f94ac
1 changed files with 1 additions and 1 deletions
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libstdc++-v3/include/std/charconv
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@ -436,7 +436,7 @@ namespace __detail
__from_chars_alnum_to_val(unsigned char __c) __from_chars_alnum_to_val(unsigned char __c)
{ {
if _GLIBCXX17_CONSTEXPR (_DecOnly) if _GLIBCXX17_CONSTEXPR (_DecOnly)
return __c - '0'; return static_cast<unsigned char>(__c - '0');
else else
{ {
// This initializer is deliberately made dependent in order to work // This initializer is deliberately made dependent in order to work