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authorLibravatar Ævar Arnfjörð Bjarmason <avarab@gmail.com>2021-05-20 13:05:45 +0200
committerLibravatar Junio C Hamano <gitster@pobox.com>2021-05-21 06:56:11 +0900
commit4e0a64a7135b204f140058ed9f53299819db447e (patch)
tree5764b23be7da8a7385b438e67a093b68cf533970 /t/t9604/cvsroot
parentGit 2.22.5 (diff)
downloadtgif-4e0a64a7135b204f140058ed9f53299819db447e.tar.xz
trace2: refactor to avoid gcc warning under -O3
Refactor tr2_dst_try_uds_connect() to avoid a gcc warning[1] that appears under -O3 (but not -O2). This makes the build pass under DEVELOPER=1 without needing a DEVOPTS=no-error. This can be reproduced with GCC Debian 8.3.0-6, but not e.g. with clang 7.0.1-8+deb10u2. We've had this warning since ee4512ed481 (trace2: create new combined trace facility, 2019-02-22). As noted in [2] this warning happens because the compiler doesn't assume that errno must be non-zero after a failed syscall. Let's work around by using the well-established "saved_errno" pattern, along with returning -1 ourselves instead of "errno". The caller can thus rely on our "errno" on failure. See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61846 for a related bug report against GCC. 1. trace2/tr2_dst.c: In function ‘tr2_dst_get_trace_fd.part.5’: trace2/tr2_dst.c:296:10: warning: ‘fd’ may be used uninitialized in this function [-Wmaybe-uninitialized] dst->fd = fd; ~~~~~~~~^~~~ trace2/tr2_dst.c:229:6: note: ‘fd’ was declared here int fd; ^~ 2. https://lore.kernel.org/git/20200404142131.GA679473@coredump.intra.peff.net/ Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com> Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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