Use musl's strptime in standalone mode (#22340)

This is a less impactful version of #22158

Author: sbc100

src/library.js

@@ -687,7 +687,6 @@ addToLibrary({
       stringToUTF8(summerName, std_name, {{{ cDefs.TZNAME_MAX + 1 }}});
     }
   },
-#endif
 
   $MONTH_DAYS_REGULAR: [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31],
   $MONTH_DAYS_LEAP: [31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31],
@@ -1004,6 +1003,7 @@ addToLibrary({
   strptime_l: (buf, format, tm, locale) => {
     return _strptime(buf, format, tm); // no locale support yet
   },
+#endif
 
   // ==========================================================================
   // setjmp.h

test/core/test_strptime_reentrant.c

@@ -13,7 +13,7 @@
 #include <string.h>
 #include <stdlib.h>
 
-#if __GLIBC__ || __EMSCRIPTEN__
+#if defined(__GLIBC__) || (defined(__EMSCRIPTEN__) && !defined(STANDALONE))
 // Not all implementations support this (for example, upstream musl)
 #define HAVE_WDAY
 #endif

test/core/test_strptime_tm.c

@@ -15,7 +15,7 @@
 #include <stdio.h>
 #include <string.h>
 
-#if __GLIBC__ || __EMSCRIPTEN__
+#if defined(__GLIBC__) || (defined(__EMSCRIPTEN__) && !defined(STANDALONE))
 // Not all implementations support these (for example, upstream musl)
 #define HAVE_WDAY
 #define HAVE_TIMEZONE
@@ -88,15 +88,12 @@ int main() {
 #ifdef HAVE_TIMEZONE
   // check timezone offsets
   STRPTIME("2020-05-01T00:00+0100","%Y-%m-%dT%H:%M%z",&tm);
-  printf("tm_gmtoff: %ld\n",tm.tm_gmtoff);
   assert(tm.tm_gmtoff == 3600);
 
   STRPTIME("2020-05-01T00:00Z","%Y-%m-%dT%H:%M%z",&tm);
-  printf("tm_gmtoff: %ld\n",tm.tm_gmtoff);
   assert(tm.tm_gmtoff == 0);
 
   STRPTIME("2020-05-01T00:00-02:30","%Y-%m-%dT%H:%M%z",&tm);
-  printf("tm_gmtoff: %ld\n",tm.tm_gmtoff);
   assert(tm.tm_gmtoff == -9000);
 #endif
 

test/core/test_strptime_tm.out

@@ -21,9 +21,6 @@ december: 11
 2345,3,31,12,34,56
 2003,1,2,12,34,56
 2003,1,2,12,34,56
-tm_gmtoff: 3600
-tm_gmtoff: 0
-tm_gmtoff: -9000
 12,34,56
 12,34,56
 12,34,56

test/test_core.py

@@ -2681,13 +2681,19 @@ def test_time_c(self):
   def test_gmtime(self):
     self.do_core_test('test_gmtime.c')
 
+  @also_with_standalone_wasm()
   def test_strptime_tm(self):
+    if self.get_setting('STANDALONE_WASM'):
+      self.emcc_args += ['-DSTANDALONE']
     self.do_core_test('test_strptime_tm.c')
 
   def test_strptime_days(self):
     self.do_core_test('test_strptime_days.c')
 
+  @also_with_standalone_wasm()
   def test_strptime_reentrant(self):
+    if self.get_setting('STANDALONE_WASM'):
+      self.emcc_args += ['-DSTANDALONE']
     self.do_core_test('test_strptime_reentrant.c')
 
   @crossplatform

tools/system_libs.py

@@ -2204,6 +2204,7 @@ def get_files(self):
                    'localtime_r.c',
                    'gmtime_r.c',
                    'mktime.c',
+                   'strptime.c',
                    'timegm.c',
                    'time.c'])
     # It is more efficient to use JS for __assert_fail, as it avoids always