support: add missing locale stubs for android L, M

The strto* family was introduced in android O (API Level 26).  However,
the support headers were adjusted to indicate that all locale aware
functions were added in L.  Provide stubs for the locale aware strto*
family until O.

llvm-svn: 330045

libcxx/include/__locale

@@ -24,11 +24,7 @@
 #elif defined(_AIX)
 # include <support/ibm/xlocale.h>
 #elif defined(__ANDROID__)
-// Android gained the locale aware functions in L (API level 21)
-# include <android/api-level.h>
-# if __ANDROID_API__ <= 20
-#  include <support/android/locale_bionic.h>
-# endif
+# include <support/android/locale_bionic.h>
 #elif defined(__sun__)
 # include <xlocale.h>
 # include <support/solaris/xlocale.h>

libcxx/include/support/android/locale_bionic.h

@@ -24,7 +24,44 @@ extern "C" {
 }
 #endif
 
+#if defined(__ANDROID__)
+
+#include <android/api-level.h>
+
+// Android gained most locale aware functions in L (API level 21)
+#if __ANDROID_API__ < 21
 #include <support/xlocale/__posix_l_fallback.h>
+#endif
+
+// The strto* family was added in O (API Level 26)
+#if __ANDROID_API__ < 26
+
+#if defined(__cplusplus)
+extern "C" {
+#endif
+
+inline _LIBCPP_ALWAYS_INLINE float strtof_l(const char* __nptr, char** __endptr,
+                                            locale_t) {
+  return ::strtof(__nptr, __endptr);
+}
+
+inline _LIBCPP_ALWAYS_INLINE double strtod_l(const char* __nptr,
+                                             char** __endptr, locale_t) {
+  return ::strtod(__nptr, __endptr);
+}
+
+inline _LIBCPP_ALWAYS_INLINE long strtol_l(const char* __nptr, char** __endptr,
+                                           int __base, locale_t) {
+  return ::strtol(__nptr, __endptr, __base);
+}
+
+#if defined(__cplusplus)
+}
+#endif
+
+#endif // __ANDROID_API__ < 26
+
+#endif // defined(__ANDROID__)
 
 #endif // defined(__BIONIC__)
 #endif // _LIBCPP_SUPPORT_ANDROID_LOCALE_BIONIC_H