[glibc/azanella/clang] ctype: Handle ctype.h internal alias for !__USE_EXTERN_INLINES

[Adhemerval Zanella <azanella@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=ccfe8276619a75d83b2717bb7d93017db61b222e

commit ccfe8276619a75d83b2717bb7d93017db61b222e
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date:   Thu Mar 31 11:44:26 2022 -0300

    ctype: Handle ctype.h internal alias for !__USE_EXTERN_INLINES

Diff:
---
 ctype/ctype.c   |  2 ++
 include/ctype.h | 12 ++++++++++++
 2 files changed, 14 insertions(+)

diff --git a/ctype/ctype.c b/ctype/ctype.c
index 81385e0e8e..b83e1600f7 100644
--- a/ctype/ctype.c
+++ b/ctype/ctype.c
@@ -45,6 +45,7 @@ __tolower (int c)
 {
   return c >= -128 && c < 256 ? __ctype_tolower[c] : c;
 }
+libc_hidden_def (__tolower)
 weak_alias (__tolower, tolower)
 
 int
@@ -52,4 +53,5 @@ __toupper (int c)
 {
   return c >= -128 && c < 256 ? __ctype_toupper[c] : c;
 }
+libc_hidden_def (__toupper)
 weak_alias (__toupper, toupper)
diff --git a/include/ctype.h b/include/ctype.h
index ac6db790b7..27a766322d 100644
--- a/include/ctype.h
+++ b/include/ctype.h
@@ -50,6 +50,11 @@ __ctype_tolower_loc (void)
   return __libc_tsd_address (const int32_t *, CTYPE_TOLOWER);
 }
 
+__typeof (tolower) __tolower;
+libc_hidden_proto (__tolower)
+__typeof (tolower) __toupper;
+libc_hidden_proto (__toupper)
+
 #  ifndef __NO_CTYPE
 /* The spec says that isdigit must only match the decimal digits.  We
    can check this without a memory access.  */
@@ -61,6 +66,13 @@ __ctype_tolower_loc (void)
 #   define __isdigit_l(c, l) ({ int __c = (c); __c >= '0' && __c <= '9'; })
 #  endif  /* Not __NO_CTYPE.  */
 
+# ifndef __USE_EXTERN_INLINES
+#  undef tolower
+#  define tolower(c) __tolower (c)
+#  undef toupper
+#  define toupper(c) __toupper (c)
+# endif
+
 # endif	/* IS_IN (libc).  */
 #endif  /* Not _ISOMAC.  */