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string(TIMESTAMP): Fix unset TZ

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The logic added by commit v3.6.0-rc1~338^2 (CMake: Extend TIMESTAMP
sub-commands with new unix time format specifier, 2016-02-16) to restore
the `TZ` environment variable does not properly handle the case in which
the variable was originally not set.  Unset the variable in this case.

Fixes: #18431
This commit is contained in:
Jose Luis Blanco-Claraco
2018-10-08 23:59:44 +02:00
committed by Brad King
parent fd02538974
commit f23760ffac
1 changed files with 11 additions and 1 deletions
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Source/cmTimestamp.cxx
+11 -1
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@@ -96,7 +96,7 @@ time_t cmTimestamp::CreateUtcTimeTFromTm(struct tm& tm) const
// From Linux timegm() manpage.
std::string tz_old;
cmSystemTools::GetEnv("TZ", tz_old);
bool const tz_was_set = cmSystemTools::GetEnv("TZ", tz_old);
tz_old = "TZ=" + tz_old;
// The standard says that "TZ=" or "TZ=[UNRECOGNIZED_TZ]" means UTC.
@@ -109,7 +109,17 @@ time_t cmTimestamp::CreateUtcTimeTFromTm(struct tm& tm) const
time_t result = mktime(&tm);
# ifdef CMAKE_BUILD_WITH_CMAKE
if (tz_was_set) {
cmSystemTools::PutEnv(tz_old);
} else {
cmSystemTools::UnsetEnv("TZ");
}
# else
// No UnsetEnv during bootstrap. This is good enough for CMake itself.
cmSystemTools::PutEnv(tz_old);
static_cast<void>(tz_was_set);
# endif
tzset();