Add a support for newlib

source/common/putilimp.h

 /*
 ******************************************************************************
 *
 *   Copyright (C) 1997-2013, International Business Machines
 *   Corporation and others.  All Rights Reserved.
 *
 ******************************************************************************
 *
 *  FILE NAME : putilimp.h
 *
@@ skipping 98 matching lines @@
    /* not defined */
 #else
 #   define U_TZSET tzset
 #endif
 
 #if defined(U_TIMEZONE) || defined(U_HAVE_TIMEZONE)
     /* Use the predefined value. */
 #elif U_PLATFORM == U_PF_ANDROID
 #   define U_TIMEZONE timezone
 #elif U_PLATFORM_IS_LINUX_BASED
+    /* uClibc does not have __timezone nor _timezone. */

[Mark Mentovai, 2014/04/30 14:06:27]

or, not nor.

+    /* gLibc has __timezone while newlib has _timezone. */
 #   if !defined(__UCLIBC__)
-    /* __timezone is only available in glibc */
-#       define U_TIMEZONE __timezone
+#      if defined(__GLIBC__)
+#         define U_TIMEZONE      __timezone
+#      else

[Mark Mentovai, 2014/04/30 14:06:27]

https://codereview.chromium.org/162913002/ uses _NEWLIB_VERSION. You can try
that since you were looking for a way to test for “is newlib” instead of ”isn’t
glibc.”

I might get rid of a nesting level here, as in:

#   if defined(__UCLIBC__)
       /* uClibc does not have __timezone or _timezone. */
#   elif defined(_NEWLIB_VERSION)
#      define U_TIMEZONE _timezone
#   else
#      define U_TIMEZONE __timezone
#   endif

+#         define U_TIMEZONE      _timezone
+#      endif
 #   endif
 #elif U_PLATFORM_USES_ONLY_WIN32_API
 #   define U_TIMEZONE _timezone
 #elif U_PLATFORM == U_PF_BSD && !defined(__NetBSD__)
    /* not defined */
 #elif U_PLATFORM == U_PF_OS400
    /* not defined */
 #elif U_PLATFORM == U_PF_IPHONE
    /* not defined */
 #else
@@ skipping 466 matching lines @@
 /* also _C_TS_calloc(x) */
 #else
 /* C defaults */
 # define uprv_default_malloc(x) malloc(x)
 # define uprv_default_realloc(x,y) realloc(x,y)
 # define uprv_default_free(x) free(x)
 #endif
 
 
 #endif