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[96.27.151.189]) by smtp.gmail.com with ESMTPSA id 00721157ae682-77f81d411d1sm8526357b3.52.2025.10.02.07.30.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 02 Oct 2025 07:30:53 -0700 (PDT) From: Joel Sherrill To: newlib@sourceware.org Cc: Joel Sherrill Subject: [PATCH v2] newlib/libc/include/setjmp.h: Add returns_twice attribute to setjmp() Date: Thu, 2 Oct 2025 09:30:26 -0500 Message-ID: <20251002143026.2289073-1-joel@rtems.org> X-Mailer: git-send-email 2.47.3 MIME-Version: 1.0 X-Spam-Status: No, score=-3037.3 required=5.0 tests=BAYES_00, FREEMAIL_FORGED_FROMDOMAIN, FREEMAIL_FROM, GIT_PATCH_0, HEADER_FROM_DIFFERENT_DOMAINS, KAM_DMARC_STATUS, RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2, RCVD_IN_VALIDITY_RPBL_BLOCKED, RCVD_IN_VALIDITY_SAFE_BLOCKED, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: newlib@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Newlib mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: newlib-bounces~patchwork=sourceware.org@sourceware.org The setjmp() function needs this attribute to help GCC avoid false positives for the -Wclobbered warning. The -Wclobbered warning is part of -Wextra. --- newlib/libc/include/setjmp.h | 14 +++++++++----- 1 file changed, 9 insertions(+), 5 deletions(-) diff --git a/newlib/libc/include/setjmp.h b/newlib/libc/include/setjmp.h index a2830b275..9e9138162 100644 --- a/newlib/libc/include/setjmp.h +++ b/newlib/libc/include/setjmp.h @@ -11,13 +11,17 @@ _BEGIN_STD_C -#ifdef __GNUC__ void longjmp (jmp_buf __jmpb, int __retval) - __attribute__ ((__noreturn__)); -#else -void longjmp (jmp_buf __jmpb, int __retval); +#ifdef __GNUC__ + __attribute__ ((__noreturn__)) +#endif + ; + +int setjmp (jmp_buf __jmpb) +#ifdef __GNUC__ + __attribute__ ((returns_twice)) #endif -int setjmp (jmp_buf __jmpb); + ; _END_STD_C