[glibc/azanella/clang] stdio: Suppress clang warnings for tst-unlockedio.c

[Adhemerval Zanella <azanella@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=53e0080c7c48cc00a132e40652f5f6e7a3efba51

commit 53e0080c7c48cc00a132e40652f5f6e7a3efba51
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date:   Thu Mar 24 16:03:16 2022 -0300

    stdio: Suppress clang warnings for tst-unlockedio.c
    
    Clang issues the following warnings:
    
      tst-unlockedio.c:63:36: error: implicit conversion from 'double' to
      'size_t' (aka 'unsigned long') changes value from -0 to 0
      [-Werror,-Wliteral-conversion]
            || fwrite_unlocked (blah, 0, -0.0, fp) != 0
               ~~~~~~~~~~~~~~~           ^~~~
      tst-unlockedio.c:61:33: error: implicit conversion from 'double' to
      'size_t' (aka 'unsigned long') changes value from 0.25 to 0
      [-Werror,-Wliteral-conversion]
            || fwrite_unlocked (--cp, 0.25, 16, fp) != 0
               ~~~~~~~~~~~~~~~        ^~~~
      tst-unlockedio.c:59:37: error: implicit conversion from 'double' to
      'size_t' (aka 'unsigned long') changes value from 0.25 to 0
      [-Werror,-Wliteral-conversion]
            || fwrite_unlocked (cp++, 16, 0.25, fp) != 0
               ~~~~~~~~~~~~~~~            ^~~~
      tst-unlockedio.c:116:34: error: implicit conversion from 'double' to
      'size_t' (aka 'unsigned long') changes value from -0 to 0
      [-Werror,-Wliteral-conversion]
            || fread_unlocked (buf, 0, -0.0, fp) != 0
               ~~~~~~~~~~~~~~          ^~~~
      tst-unlockedio.c:114:32: error: implicit conversion from 'double' to
      'size_t' (aka 'unsigned long') changes value from 0.25 to 0
      [-Werror,-Wliteral-conversion]
            || fread_unlocked (--wp, 0.25, 16, fp) != 0
               ~~~~~~~~~~~~~~        ^~~~
      tst-unlockedio.c:112:36: error: implicit conversion from 'double' to
      'size_t' (aka 'unsigned long') changes value from 0.25 to 0
      [-Werror,-Wliteral-conversion]
            || fread_unlocked (wp++, 16, 0.25, fp) != 0
               ~~~~~~~~~~~~~~            ^~~~

Diff:
---
 stdio-common/tst-unlockedio.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/stdio-common/tst-unlockedio.c b/stdio-common/tst-unlockedio.c
index 8ff6b074b0..d0ebbbfc94 100644
--- a/stdio-common/tst-unlockedio.c
+++ b/stdio-common/tst-unlockedio.c
@@ -51,6 +51,9 @@ do_test (void)
      fread_unlocked below as well.  */
   DIAG_PUSH_NEEDS_COMMENT;
   DIAG_IGNORE_NEEDS_COMMENT (4.9, "-Wdiv-by-zero");
+  /* clang warns about the implicit conversion from double to size_t,
+     which is required by this tests.  */
+  DIAG_IGNORE_NEEDS_COMMENT_CLANG (13, "-Wliteral-conversion");
   if (ftello (fp) != 0
       || fwrite_unlocked (blah, blah - blah, strlen (blah), f++) != 0
       || f != fp + 1
@@ -104,6 +107,7 @@ do_test (void)
   /* See explanation above.  */
   DIAG_PUSH_NEEDS_COMMENT;
   DIAG_IGNORE_NEEDS_COMMENT (4.9, "-Wdiv-by-zero");
+  DIAG_IGNORE_NEEDS_COMMENT_CLANG (13, "-Wliteral-conversion");
   if (ftello (fp) != 0
       || fread_unlocked (buf, buf - buf, strlen (blah), f++) != 0
       || f != fp + 1