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From: Adhemerval Zanella <>
Subject: [glibc/release/2.36/master] stdlib: Suppress gcc diagnostic that char8_t is a keyword in C++20 in uchar.h.
Date: Mon,  1 Aug 2022 13:03:05 +0000 (GMT)	[thread overview]
Message-ID: <> (raw);h=c3fda489cfdb2260f9fec706e6fd7259858c4467

commit c3fda489cfdb2260f9fec706e6fd7259858c4467
Author: Tom Honermann <>
Date:   Sun Jul 24 01:11:43 2022 -0400

    stdlib: Suppress gcc diagnostic that char8_t is a keyword in C++20 in uchar.h.
    gcc 13 issues the following diagnostic for the uchar.h header when the
    -Wc++20-compat option is enabled in C++ modes that do not enable char8_t
    as a builtin type (C++17 and earlier by default; subject to _GNU_SOURCE
    and the gcc -f[no-]char8_t option).
      warning: identifier ‘char8_t’ is a keyword in C++20 [-Wc++20-compat]
    This change modifies the uchar.h header to suppress the diagnostic through
    the use of '#pragma GCC diagnostic' directives for gcc 10 and later (the
    -Wc++20-compat option was added in gcc version 10).  Unfortunately, a bug
    in gcc currently prevents those directives from having the intended effect
    as reported at  A patch for that issue has
    been submitted and is available in the email thread archive linked below.
    (cherry picked from commit 825f84f133bd840347dc49229b6d831f07d04775)

 wcsmbs/uchar.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/wcsmbs/uchar.h b/wcsmbs/uchar.h
index c37e8619a0..5f7139f279 100644
--- a/wcsmbs/uchar.h
+++ b/wcsmbs/uchar.h
@@ -34,8 +34,16 @@
 /* Declare the C2x char8_t typedef in C2x modes, but only if the C++
   __cpp_char8_t feature test macro is not defined.  */
 #if __GLIBC_USE (ISOC2X) && !defined __cpp_char8_t
+#if __GNUC_PREREQ (10, 0) && defined __cplusplus
+/* Suppress the diagnostic regarding char8_t being a keyword in C++20.  */
+# pragma GCC diagnostic push
+# pragma GCC diagnostic ignored "-Wc++20-compat"
 /* Define the 8-bit character type.  */
 typedef unsigned char char8_t;
+#if __GNUC_PREREQ (10, 0) && defined __cplusplus
+# pragma GCC diagnostic pop
 #ifndef __USE_ISOCXX11

                 reply	other threads:[~2022-08-01 13:03 UTC|newest]

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