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Enable tzset only on Windows desktop app #2633

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merged 1 commit into from
Dec 7, 2021
Merged

Enable tzset only on Windows desktop app #2633

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18 changes: 17 additions & 1 deletion include/fmt/chrono.h
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Original file line number Diff line number Diff line change
Expand Up @@ -20,6 +20,20 @@

FMT_BEGIN_NAMESPACE

// Enable tzset.
#ifndef FMT_USE_TZSET
// UWP doesn't provide _tzset.
# if FMT_HAS_INCLUDE("winapifamily.h")
# include <winapifamily.h>
# endif
# if defined(_WIN32) && (!defined(WINAPI_FAMILY) || \
(WINAPI_FAMILY == WINAPI_FAMILY_DESKTOP_APP))
# define FMT_USE_TZSET 1
# else
# define FMT_USE_TZSET 0
# endif
#endif

// Enable safe chrono durations, unless explicitly disabled.
#ifndef FMT_SAFE_DURATION_CAST
# define FMT_SAFE_DURATION_CAST 1
Expand Down Expand Up @@ -924,7 +938,7 @@ template <typename T>
struct has_member_data_tm_zone<T, void_t<decltype(T::tm_zone)>>
: std::true_type {};

#if defined(_WIN32)
#if FMT_USE_TZSET
inline void tzset_once() {
static bool init = []() -> bool {
_tzset();
Expand Down Expand Up @@ -1067,7 +1081,9 @@ template <typename OutputIt, typename Char> class tm_writer {
}
void format_utc_offset_impl(std::false_type) {
#if defined(_WIN32)
# if FMT_USE_TZSET
tzset_once();
# endif
long offset = 0;
_get_timezone(&offset);
if (tm_.tm_isdst) {
Expand Down