Move timegm implementation to libshared (#3875)

Move `timegm` implementation to libshared

Author: tobiolo

CMakeLists.txt

@@ -67,7 +67,6 @@ SET (TASK_BINDIR  bin            CACHE STRING "Installation directory for the bi
 # rust libs require these
 set (TASK_LIBRARIES dl pthread)
 
-check_function_exists (timegm  HAVE_TIMEGM)
 check_function_exists (get_current_dir_name HAVE_GET_CURRENT_DIR_NAME)
 check_function_exists (wordexp HAVE_WORDEXP)
 

cmake.h.in

@@ -41,9 +41,6 @@
 /* Found tm_gmtoff */
 #cmakedefine HAVE_TM_GMTOFF
 
-/* Found timegm */
-#cmakedefine HAVE_TIMEGM
-
 /* Found st.st_birthtime struct member */
 #cmakedefine HAVE_ST_BIRTHTIME
 

src/util.cpp

@@ -218,24 +218,6 @@ const std::vector<std::string> extractParents(const std::string& project,
   return vec;
 }
 
-////////////////////////////////////////////////////////////////////////////////
-#ifndef HAVE_TIMEGM
-time_t timegm(struct tm* tm) {
-  time_t ret;
-  char* tz;
-  tz = getenv("TZ");
-  setenv("TZ", "UTC", 1);
-  tzset();
-  ret = mktime(tm);
-  if (tz)
-    setenv("TZ", tz, 1);
-  else
-    unsetenv("TZ");
-  tzset();
-  return ret;
-}
-#endif
-
 ////////////////////////////////////////////////////////////////////////////////
 bool nontrivial(const std::string& input) {
   std::string::size_type i = 0;

src/util.h

@@ -54,10 +54,6 @@ const std::string indentProject(const std::string&, const std::string& whitespac
 
 const std::vector<std::string> extractParents(const std::string&, const char& delimiter = '.');
 
-#ifndef HAVE_TIMEGM
-time_t timegm(struct tm* tm);
-#endif
-
 bool nontrivial(const std::string&);
 const char* optionalBlankLine();
 void setHeaderUnderline(Table&);