0028971: Configuration - fix compatibility with glibc 2.26+ due to xlocale.h removal

src/Standard/Standard_CLocaleSentry.cxx

@@ -32,7 +32,7 @@ namespace
     CLocalePtr()
     #ifdef HAVE_XLOCALE_H
     : myLocale (newlocale (LC_ALL_MASK, "C", NULL))
-    #elif defined(_WIN32) && !defined(__MINGW32__)
+    #elif defined(_MSC_VER)
     : myLocale (_create_locale (LC_ALL, "C"))
     #else
     : myLocale (NULL)
@@ -43,7 +43,7 @@ namespace
     {
     #ifdef HAVE_XLOCALE_H
       freelocale (myLocale);
-    #elif defined(_WIN32) && !defined(__MINGW32__)
+    #elif defined(_MSC_VER)
       _free_locale (myLocale);
     #endif
     }

src/Standard/Standard_CLocaleSentry.hxx

@@ -35,7 +35,8 @@
   #endif
 #endif // ifndef HAVE_LOCALE_H
 
-#ifdef HAVE_XLOCALE_H
+#if defined(HAVE_XLOCALE_H) && !(defined(__GLIBC__) && (__GLIBC__ == 2 && __GLIBC_MINOR__ <= 24))
+  // xlocale.h is actually a non-standard header file; glibc 2.26 has removed it altogether (all definition comes from locale.h)
   #include <xlocale.h>
 #endif
 
@@ -65,7 +66,7 @@ public:
 
 #ifdef HAVE_XLOCALE_H
   typedef  locale_t clocale_t;
-#elif defined(_WIN32) && !defined(__MINGW32__)
+#elif defined(_MSC_VER)
   typedef _locale_t clocale_t;
 #else
   typedef void*     clocale_t;
@@ -78,7 +79,7 @@ public:
 private:
 
   void* myPrevLocale;       //!< previous locale, platform-dependent pointer!
-#ifdef _WIN32
+#ifdef _MSC_VER
   int   myPrevTLocaleState; //!< previous thread-locale state, MSVCRT-specific
 #endif
 

src/Standard/Standard_CString.cxx

@@ -63,7 +63,7 @@ Standard_Integer HashCodes (const Standard_CString Value,
 #ifdef __APPLE__
   // There are a lot of *_l functions availalbe on Mac OS X - we use them
   #define SAVE_TL()
-#elif defined(_WIN32) && !defined(__MINGW32__)
+#elif defined(_MSC_VER)
   // MSVCRT has equivalents with slightly different syntax
   #define SAVE_TL()
   #define strtod_l(thePtr, theNextPtr, theLocale)                _strtod_l(thePtr, theNextPtr, theLocale)