{"id":2223148,"url":"http://patchwork.ozlabs.org/api/1.1/patches/2223148/?format=json","web_url":"http://patchwork.ozlabs.org/project/gcc/patch/20260414143908.930196-1-tkaminsk@redhat.com/","project":{"id":17,"url":"http://patchwork.ozlabs.org/api/1.1/projects/17/?format=json","name":"GNU Compiler Collection","link_name":"gcc","list_id":"gcc-patches.gcc.gnu.org","list_email":"gcc-patches@gcc.gnu.org","web_url":null,"scm_url":null,"webscm_url":null},"msgid":"<20260414143908.930196-1-tkaminsk@redhat.com>","date":"2026-04-14T14:35:22","name":"libstdc++: Define __cpp_lib_stdbit_h and __cpp_lib_stdckdint_h feature test macros.","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"0a39402e7a8ff877394b6ad69287389bad86017a","submitter":{"id":90409,"url":"http://patchwork.ozlabs.org/api/1.1/people/90409/?format=json","name":"Tomasz Kamiński","email":"tkaminsk@redhat.com"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/gcc/patch/20260414143908.930196-1-tkaminsk@redhat.com/mbox/","series":[{"id":499858,"url":"http://patchwork.ozlabs.org/api/1.1/series/499858/?format=json","web_url":"http://patchwork.ozlabs.org/project/gcc/list/?series=499858","date":"2026-04-14T14:35:22","name":"libstdc++: Define __cpp_lib_stdbit_h and __cpp_lib_stdckdint_h feature test macros.","version":1,"mbox":"http://patchwork.ozlabs.org/series/499858/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2223148/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2223148/checks/","tags":{},"headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","gcc-patches@gcc.gnu.org"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","gcc-patches@gcc.gnu.org"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256\n header.s=mimecast20190719 header.b=UicQ4aiv;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=gcc.gnu.org\n (client-ip=2620:52:6:3111::32; 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a=rsa-sha256; c=relaxed/relaxed; d=redhat.com;\n s=mimecast20190719; t=1776177555;\n h=from:from:reply-to:subject:subject:date:date:message-id:message-id:\n to:to:cc:mime-version:mime-version:content-type:content-type:\n content-transfer-encoding:content-transfer-encoding;\n bh=ed7wlwlFLiVcBwVG5vY11ezicQNa/lur3yO89+SP6cs=;\n b=UicQ4aivwJedF2V9ngC3TWCiUO+O62HATHPm2H/9JR/cf1DWV8SITTNTR1XHmKUEDoaAQ/\n fL4wJkaxo1VzkYelJddcwH8alH9ZUHwau+0mXA3AleLZIxu/11AjqECKx6yzyGPQ4mnK4M\n nXeGQbY7vX2A9w4FYLUw1Ai3UYf8IhY=","X-MC-Unique":"1-MpfjnnPe6NDogp9VLRPg-1","X-Mimecast-MFC-AGG-ID":"1-MpfjnnPe6NDogp9VLRPg_1776177551","From":"=?utf-8?q?Tomasz_Kami=C5=84ski?= ","To":"libstdc++@gcc.gnu.org,\n\tgcc-patches@gcc.gnu.org","Subject":"[PATCH] libstdc++: Define __cpp_lib_stdbit_h and\n __cpp_lib_stdckdint_h feature test macros.","Date":"Tue, 14 Apr 2026 16:35:22 +0200","Message-ID":"<20260414143908.930196-1-tkaminsk@redhat.com>","MIME-Version":"1.0","X-Scanned-By":"MIMEDefang 3.4.1 on 10.30.177.4","X-Mimecast-Spam-Score":"0","X-Mimecast-MFC-PROC-ID":"76TJHbla621duHO4lYHpKuSPgMu7UAuZqskGSjcdtLE_1776177551","X-Mimecast-Originator":"redhat.com","Content-Transfer-Encoding":"8bit","content-type":"text/plain; charset=\"US-ASCII\"; x-default=true","X-BeenThere":"gcc-patches@gcc.gnu.org","X-Mailman-Version":"2.1.30","Precedence":"list","List-Id":"Gcc-patches mailing list ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"gcc-patches-bounces~incoming=patchwork.ozlabs.org@gcc.gnu.org"},"content":"This implements LWG4550: Need new feature test macros for \nand .\n\nlibstdc++-v3/ChangeLog:\n\n\t* include/bits/version.def (stdbit_h, stdckdint_h): Define.\n\t* include/bits/version.h: Regenerate.\n\t* include/c_compatibility/stdbit.h (__cpp_lib_stdbit_h): Define\n\tand use it in guards.\n\t* include/c_compatibility/stdckdint.h (__cpp_lib_stdckdint_h):\n\tDefine and use it in guards.\n---\nTesting on x86_64-linux. Dedicated tests 20_util/stdbit* and 26_numerics/stdckint*\nalready passes, so valus seem correct. \n\n libstdc++-v3/include/bits/version.def | 16 +++++++++++++++\n libstdc++-v3/include/bits/version.h | 20 +++++++++++++++++++\n libstdc++-v3/include/c_compatibility/stdbit.h | 8 ++++++--\n .../include/c_compatibility/stdckdint.h | 8 ++++++--\n 4 files changed, 48 insertions(+), 4 deletions(-)","diff":"diff --git a/libstdc++-v3/include/bits/version.def b/libstdc++-v3/include/bits/version.def\nindex 94fc1f85993..13dba4d6378 100644\n--- a/libstdc++-v3/include/bits/version.def\n+++ b/libstdc++-v3/include/bits/version.def\n@@ -1871,6 +1871,22 @@ ftms = {\n };\n };\n \n+ftms = {\n+ name = stdbit_h;\n+ values = {\n+ v = 202603;\n+ cxxmin = 26;\n+ };\n+};\n+\n+ftms = {\n+ name = stdckdint_h;\n+ values = {\n+ v = 202603;\n+ cxxmin = 26;\n+ };\n+};\n+\n ftms = {\n name = adaptor_iterator_pair_constructor;\n values = {\ndiff --git a/libstdc++-v3/include/bits/version.h b/libstdc++-v3/include/bits/version.h\nindex 402e67580eb..743f7e29fe2 100644\n--- a/libstdc++-v3/include/bits/version.h\n+++ b/libstdc++-v3/include/bits/version.h\n@@ -2076,6 +2076,26 @@\n #endif /* !defined(__cpp_lib_stdatomic_h) */\n #undef __glibcxx_want_stdatomic_h\n \n+#if !defined(__cpp_lib_stdbit_h)\n+# if (__cplusplus > 202302L)\n+# define __glibcxx_stdbit_h 202603L\n+# if defined(__glibcxx_want_all) || defined(__glibcxx_want_stdbit_h)\n+# define __cpp_lib_stdbit_h 202603L\n+# endif\n+# endif\n+#endif /* !defined(__cpp_lib_stdbit_h) */\n+#undef __glibcxx_want_stdbit_h\n+\n+#if !defined(__cpp_lib_stdckdint_h)\n+# if (__cplusplus > 202302L)\n+# define __glibcxx_stdckdint_h 202603L\n+# if defined(__glibcxx_want_all) || defined(__glibcxx_want_stdckdint_h)\n+# define __cpp_lib_stdckdint_h 202603L\n+# endif\n+# endif\n+#endif /* !defined(__cpp_lib_stdckdint_h) */\n+#undef __glibcxx_want_stdckdint_h\n+\n #if !defined(__cpp_lib_adaptor_iterator_pair_constructor)\n # if (__cplusplus >= 202100L) && _GLIBCXX_HOSTED\n # define __glibcxx_adaptor_iterator_pair_constructor 202106L\ndiff --git a/libstdc++-v3/include/c_compatibility/stdbit.h b/libstdc++-v3/include/c_compatibility/stdbit.h\nindex 1fb691e36c1..fa4ec0414c6 100644\n--- a/libstdc++-v3/include/c_compatibility/stdbit.h\n+++ b/libstdc++-v3/include/c_compatibility/stdbit.h\n@@ -29,7 +29,11 @@\n #ifndef _GLIBCXX_STDBIT_H\n #define _GLIBCXX_STDBIT_H\n \n-#if __cplusplus > 202302L\n+#define __glibcxx_want_stdbit_h\n+#include \n+\n+#ifdef __cpp_lib_stdbit_h // C++ >= 26\n+\n #include \n \n #define __STDC_VERSION_STDBIT_H__ 202311L\n@@ -577,6 +581,6 @@ _GLIBCXX_STDBIT_FUNC(stdc_bit_floor);\n _GLIBCXX_STDBIT_FUNC(stdc_bit_ceil);\n #undef _GLIBCXX_STDBIT_FUNC\n #endif // !DOXYGEN\n-#endif // C++26\n+#endif // __cpp_lib_stdbit_h\n \n #endif // _GLIBCXX_STDBIT_H\ndiff --git a/libstdc++-v3/include/c_compatibility/stdckdint.h b/libstdc++-v3/include/c_compatibility/stdckdint.h\nindex 5bdf4dc7b24..0f0b30cc899 100644\n--- a/libstdc++-v3/include/c_compatibility/stdckdint.h\n+++ b/libstdc++-v3/include/c_compatibility/stdckdint.h\n@@ -29,7 +29,11 @@\n #ifndef _GLIBCXX_STDCKDINT_H\n #define _GLIBCXX_STDCKDINT_H\n \n-#if __cplusplus > 202302L\n+#define __glibcxx_want_stdckdint_h\n+#include \n+\n+#ifdef __cpp_lib_stdckdint_h // C++ >= 26\n+\n #include \n #include \n \n@@ -96,6 +100,6 @@ using __gnu_cxx::ckd_sub;\n using __gnu_cxx::ckd_mul;\n #endif\n \n-#endif // C++26\n+#endif // __cpp_lib_stdckdint_h\n \n #endif // _GLIBCXX_STDCKDINT_H\n","prefixes":[]}