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<base href="http://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Crash with va_list using -mcmodel=medium and -fPIC"
href="http://llvm.org/bugs/show_bug.cgi?id=18652">18652</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Crash with va_list using -mcmodel=medium and -fPIC
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</td>
</tr>
<tr>
<th>Version</th>
<td>3.4
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>new bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>zev@bewilderbeest.net
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Attempting to compile the following code using -mcmodel=medium and -fPIC on
clang 3.4 (built from release tarball with gcc 4.8.2) yields a crash:
[zev@host: tmp]% cat foo.i
extern char c;
void f(char, __builtin_va_list);
void g(void)
{
__builtin_va_list v;
f(c, v);
}
[zev@host: tmp]% /var/tmp/unsup-test/llvm-3.4/bin/clang -c -mcmodel=medium
-fPIC -o foo.o foo.i
Unimplemented
UNREACHABLE executed at
/var/tmp/unsup-test/llvm-3.4/src/llvm-3.4/lib/Target/X86/MCTargetDesc/X86ELFObjectWriter.cpp:107!
0 clang 0x000000000232e462 llvm::sys::PrintStackTrace(_IO_FILE*) +
34
1 clang 0x000000000232e084
2 libpthread.so.0 0x000000354fa0f710
3 libc.so.6 0x000000354ee32925 gsignal + 53
4 libc.so.6 0x000000354ee34105 abort + 373
5 clang 0x000000000231b08c
6 clang 0x0000000002160ccc
7 clang 0x000000000217c938
8 clang 0x0000000002195b7a
llvm::MCAssembler::handleFixup(llvm::MCAsmLayout const&, llvm::MCFragment&,
llvm::MCFixup const&) + 106
9 clang 0x0000000002198d63 llvm::MCAssembler::Finish() + 707
10 clang 0x0000000001c65fc3
llvm::AsmPrinter::doFinalization(llvm::Module&) + 1299
11 clang 0x00000000022b9549
llvm::FPPassManager::doFinalization(llvm::Module&) + 153
12 clang 0x00000000022c06e3
llvm::legacy::PassManagerImpl::run(llvm::Module&) + 963
13 clang 0x00000000009a9cfb
clang::EmitBackendOutput(clang::DiagnosticsEngine&, clang::CodeGenOptions
const&, clang::TargetOptions const&, clang::LangOptions const&, llvm::Module*,
clang::BackendAction, llvm::raw_ostream*) + 2283
14 clang 0x00000000009a779c
15 clang 0x0000000000b2186b clang::ParseAST(clang::Sema&, bool, bool)
+ 507
16 clang 0x00000000009a5d4c clang::CodeGenAction::ExecuteAction() +
60
17 clang 0x000000000082de29 clang::FrontendAction::Execute() + 249
18 clang 0x000000000080ce60
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) + 352
19 clang 0x00000000007f5b61
clang::ExecuteCompilerInvocation(clang::CompilerInstance*) + 1857
20 clang 0x00000000007f0bf8 cc1_main(char const**, char const**, char
const*, void*) + 1208
21 clang 0x00000000007d0180 main + 688
22 libc.so.6 0x000000354ee1ed1d __libc_start_main + 253
23 clang 0x00000000007efa3d
Stack dump:
0. Program arguments: /var/tmp/unsup-test/llvm-3.4/amd64_rhel6/bin/clang
-cc1 -triple x86_64-unknown-linux-gnu -emit-obj -mrelax-all -disable-free
-main-file-name foo.i -mrelocation-model pic -pic-level 2 -mdisable-fp-elim
-fmath-errno -masm-verbose -mconstructor-aliases -munwind-tables -mcode-model
medium -target-cpu x86-64 -target-linker-version 2.20.51.0.2 -coverage-file
/tmp/foo.o -resource-dir
/var/tmp/unsup-test/llvm-3.4/amd64_rhel6/bin/../lib/clang/3.4
-fdebug-compilation-dir /tmp -ferror-limit 19 -fmessage-length 106
-mstackrealign -fobjc-runtime=gcc -fdiagnostics-show-option -fcolor-diagnostics
-vectorize-slp -o foo.o -x cpp-output foo.i
1. <eof> parser at end of file
2. Code generation
clang: error: unable to execute command: Aborted (core dumped)
clang: error: clang frontend command failed due to signal (use -v to see
invocation)
clang version 3.4 (tags/RELEASE_34/final)
Target: x86_64-unknown-linux-gnu
Thread model: posix
In addition to the va_list and flags, it also appears dependent on the
extern-ness of the declaration of 'c' -- removing that avoids the crash.</pre>
</div>
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