Date: Mon, 23 Mar 2020 13:29:29 +0000 From: bugzilla-noreply@freebsd.org To: toolchain@FreeBSD.org Subject: [Bug 245006] toolchain: clang issues bogus "warning: multi-line // comment [-Wcomment]" Message-ID: <bug-245006-29464@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D245006 Bug ID: 245006 Summary: toolchain: clang issues bogus "warning: multi-line // comment [-Wcomment]" Product: Base System Version: 12.1-RELEASE Hardware: Any URL: https://github.com/Genivia/RE-flex/issues/68 OS: Any Status: New Severity: Affects Some People Priority: --- Component: standards Assignee: standards@FreeBSD.org Reporter: mandree@FreeBSD.org CC: toolchain@FreeBSD.org Greetings, debugging a ports/textproc/re-flex 1.6.4 issue, I came across a standards violation in clang, observed in base clang 8.0.1 (FreeBSD 12.1 amd64), ports clang 9 and clang-devel as of today (llvm90-9.0.1 llvm-devel-11.0.d20200117= ), but not gcc-9.2.0 from ports. Save these two lines as try.c: // \ x void f(void) {} Then observe: $ gcc -pedantic-errors -std=3Dc11 -c /tmp/try.c=20 (no output) $ /usr/bin/clang -pedantic-errors -std=3Dc11 -c /tmp/try.c=20 /tmp/try.c:1:4: error: multi-line // comment [-Werror,-Wcomment] // \ ^ 1 error generated. Reading up in C99, C11, C++11, it is clear that line merging happens in compilation phase 2, before phase 3 elides comments and replaces them by one space. --=20 You are receiving this mail because: You are on the CC list for the bug.=
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