[Webkit-unassigned] [Bug 190208] New: clang Linux build cannot link because of __builtin_mul_overflow
bugzilla-daemon at webkit.org
bugzilla-daemon at webkit.org
Tue Oct 2 10:14:36 PDT 2018
https://bugs.webkit.org/show_bug.cgi?id=190208
Bug ID: 190208
Summary: clang Linux build cannot link because of
__builtin_mul_overflow
Product: WebKit
Version: Other
Hardware: Unspecified
OS: Unspecified
Status: NEW
Severity: Normal
Priority: P2
Component: Web Template Framework
Assignee: webkit-unassigned at lists.webkit.org
Reporter: olivier.blin at softathome.com
CC: darin at apple.com, guijemont at igalia.com,
loic.yhuel at softathome.com, mark.lam at apple.com,
sam at webkit.org, yusukesuzuki at slowstart.org,
zan at falconsigh.net
Since r183319, __builtin_mul_overflow is used with gcc or clang in WTF/wtf/CheckedArithmetic.h
This leads to a link failure when WebKit is built on Linux with clang and the libgcc runtime:
BINXX WPELauncher
output/staging/usr/lib/libWPEWebKit-0.1.so: undefined reference to `__mulodi4'
collect2: error: ld returned 1 exit status
This is because clang generates code using the __mulodi4 symbol for __builtin_mul_overflow.
But this symbol is available only in compiler-rt, and not in the libgcc runtime used by most Linux distributions of clang.
See also this upstream clang bug: https://bugs.llvm.org/show_bug.cgi?id=28629
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