From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 7872) id 93E0738582BA; Fri, 8 Jul 2022 13:49:50 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 93E0738582BA Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable From: Enze Li To: gdb-cvs@sourceware.org Subject: [binutils-gdb] gdb: initialize the data_head variable to eliminate compilation warnings X-Act-Checkin: binutils-gdb X-Git-Author: Enze Li X-Git-Refname: refs/heads/master X-Git-Oldrev: ec54dc915f42fa6f0da9902c333623f71d7aa5a3 X-Git-Newrev: 44ca285b73b68f6a8fa3e89004b510d6b7d98e91 Message-Id: <20220708134950.93E0738582BA@sourceware.org> Date: Fri, 8 Jul 2022 13:49:50 +0000 (GMT) X-BeenThere: gdb-cvs@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gdb-cvs mailing list List-Unsubscribe: , List-Archive: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 08 Jul 2022 13:49:50 -0000 https://sourceware.org/git/gitweb.cgi?p=3Dbinutils-gdb.git;h=3D44ca285b73b6= 8f6a8fa3e89004b510d6b7d98e91 commit 44ca285b73b68f6a8fa3e89004b510d6b7d98e91 Author: Enze Li Date: Sat Jun 11 18:36:48 2022 +0800 gdb: initialize the data_head variable to eliminate compilation warnings =20 On a machine with gcc 12, I get this warning: =20 CXX nat/linux-btrace.o In function =E2=80=98btrace_error linux_read_bts(btrace_data_bts*, btra= ce_target_info*, btrace_read_type)=E2=80=99, inlined from =E2=80=98btrace_error linux_read_btrace(btrace_data*, = btrace_target_info*, btrace_read_type)=E2=80=99 at ../gdb/nat/linux-btrace.= c:935:29: ../gdb/nat/linux-btrace.c:865:21: warning: =E2=80=98data_head=E2=80=99 = may be used uninitialized [-Wmaybe-uninitialized] 865 | pevent->last_head =3D data_head; | ~~~~~~~~~~~~~~~~~~^~~~~~~~~~~ ../gdb/nat/linux-btrace.c: In function =E2=80=98btrace_error linux_read= _btrace(btrace_data*, btrace_target_info*, btrace_read_type)=E2=80=99: ../gdb/nat/linux-btrace.c:792:9: note: =E2=80=98data_head=E2=80=99 was = declared here 792 | __u64 data_head, data_tail; | ^~~~~~~~~ =20 Fix this by initializing the 'data_head' variable. =20 Tested by rebuilding on x86_64 openSUSE Tumbleweed with gcc 12. Diff: --- gdb/nat/linux-btrace.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/gdb/nat/linux-btrace.c b/gdb/nat/linux-btrace.c index b0d6dcd7cf1..c31fb5ffe43 100644 --- a/gdb/nat/linux-btrace.c +++ b/gdb/nat/linux-btrace.c @@ -789,7 +789,7 @@ linux_read_bts (struct btrace_data_bts *btrace, struct perf_event_buffer *pevent; const uint8_t *begin, *end, *start; size_t buffer_size, size; - __u64 data_head, data_tail; + __u64 data_head =3D 0, data_tail; unsigned int retries =3D 5; =20 pevent =3D &tinfo->variant.bts.bts;