http://llvm.org/bugs/show_bug.cgi?id=6974
Summary: -fno-rtti and 'try' / 'catch' causes clang to SIGSEGV
(or assertion failure)
Product: clang
Version: 2.7
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P
Component: C++
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected], [email protected]
Removing '-fno-rtti' allows this file to build properly.
g++ compiles file below successfully (-fexceptions and -fno-rtti was used in
original code to allow exception handling within modules, but disable things,
like 'dynamic_cast', 'typeinfo' and relevant strings in generated object files)
// $ cat try_error.cc
/*
* clang++ -O0 -fexceptions -fno-rtti try_error.cc -emit-llvm -c
*/
class err {};
void f (void)
{
try {}
catch( err & /* error */ )
{}
}
Trying to build it:
$ clang++ -O0 -fexceptions -fno-rtti try_error.cc -emit-llvm -c
Instruction referencing instruction not embedded in a basic block!
%_rethrow = alloca i8* ; <i8**> [#uses=4]
store i8* %exc1, i8** %_rethrow
Instruction referencing instruction not embedded in a basic block!
%exc1 = call i8* @llvm.eh.exception() ; <i8*> [#uses=3]
store i8* %exc1, i8** %_rethrow
Broken module found, compilation aborted!
0 clang 0x000000000116281f
1 clang 0x000000000116303d
2 libpthread.so.0 0x00007f74bc948120
3 libc.so.6 0x00007f74bbc661a5 gsignal + 53
4 libc.so.6 0x00007f74bbc675d0 abort + 384
5 clang 0x0000000001113f5b
6 clang 0x00000000010f03d6
7 clang 0x00000000010f05b1
8 clang 0x00000000010f07de
9 clang 0x000000000041b8a5
10 clang 0x00000000005f83f4
11 clang 0x000000000041ef49
12 clang 0x00000000004123d9
13 clang 0x0000000000414e5b main + 1675
14 libc.so.6 0x00007f74bbc52bbd __libc_start_main + 253
15 clang 0x000000000040ff59
Stack dump:
0. Program arguments: /usr/bin/clang -cc1 -triple x86_64-pc-linux-gnu
-emit-llvm-bc -disable-free -main-file-name try_error.cc -mrelocation-model
static -mdisable-fp-elim -mconstructor-aliases -munwind-tables -target-cpu
x86-64 -resource-dir /usr/lib/clang/1.1 -O0 -fmessage-length 127 -fexceptions
-fno-rtti -fgnu-runtime -fdiagnostics-show-option -fcolor-diagnostics -o
try_error.o -x c++ try_error.cc
1. <eof> parser at end of file
2. Per-function optimization
3. Running pass 'Module Verifier' on function '@_Z1fv'
clang: error: compiler command failed due to signal 6 (use -v to see
invocation)
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