[cfe-dev] Crash on tgmath parsing with release build

[Jean-Daniel Dupas]

When parsing tgmath.h using a fresh release build of clang (make  
ENABLE_OPTIMIZED=1 DISABLE_ASSERTIONS=1), I got this:
This crash does not occur with a debug build thought.

echo "#include <tgmath.h>" > math.c
clang -v -E math.c

clang version 1.1 (http://llvm.org/svn/llvm-project/cfe/trunk 82688)
Target: x86_64-apple-darwin10
Thread model: posix
  "/Volumes/MacPro/Projects/OpenSource/llvm/Release-Asserts/bin/clang- 
cc" -triple x86_64-apple-darwin10 -E -disable-free -main-file-name  
math.c --relocation-model pic -pic-level=1 --disable-fp-elim --unwind- 
tables=1 --mcpu=core2 --fmath-errno=0 -v -mmacosx-version-min=10.6.0 - 
fdiagnostics-show-option -o - -x c math.c
clang-cc version 1.1 based upon llvm 2.7svn hosted on x86_64-apple- 
darwin10
#include "..." search starts here:
#include <...> search starts here:
  /Volumes/MacPro/Projects/OpenSource/llvm/Release-Asserts/lib/clang/ 
1.1/include
  /usr/local/include
  /usr/include
  /System/Library/Frameworks (framework directory)
  /Library/Frameworks (framework directory)
End of search list.
0   clang-cc          0x000000010099b2a2 PrintStackTrace(void*) + 34
1   clang-cc          0x000000010099b7f9 SignalHandler(int) + 617
2   libSystem.B.dylib 0x00007fff817780aa _sigtramp + 26
3   libstdc++.6.dylib 0x00007fff80eb8f05 operator new(unsigned long) +  
97
4   clang-cc          0x000000010037a81f  
clang::TokenLexer::ExpandFunctionArguments() + 767
5   clang-cc          0x0000000100379b70 clang::TokenLexer::Init 
(clang::Token&, clang::SourceLocation, clang::MacroArgs*) + 288
6   clang-cc          0x0000000100370916  
clang::Preprocessor::EnterMacro(clang::Token&, clang::SourceLocation,  
clang::MacroArgs*) + 454
7   clang-cc          0x0000000100372439  
clang::Preprocessor::HandleMacroExpandedIdentifier(clang::Token&,  
clang::MacroInfo*) + 745
8   clang-cc          0x0000000100376923  
clang::Preprocessor::HandleIdentifier(clang::Token&) + 323
9   clang-cc          0x000000010035f80f clang::Lexer::LexIdentifier 
(clang::Token&, char const*) + 223
10  clang-cc          0x000000010035fec8 clang::Lexer::LexTokenInternal 
(clang::Token&) + 1192
11  clang-cc          0x0000000100022c7e clang::Preprocessor::Lex 
(clang::Token&) + 78
12  clang-cc          0x00000001000833bc  
clang::DoPrintPreprocessedInput(clang::Preprocessor&,  
llvm::raw_ostream*, bool, bool, bool, bool) + 1756
13  clang-cc          0x000000010001d98e main + 13918
14  clang-cc          0x0000000100018364 start + 52
Stack dump:
0.	Program arguments: /Volumes/MacPro/Projects/OpenSource/llvm/Release- 
Asserts/bin/clang-cc -triple x86_64-apple-darwin10 -E -disable-free - 
main-file-name math.c --relocation-model pic -pic-level=1 --disable-fp- 
elim --unwind-tables=1 --mcpu=core2 --fmath-errno=0 -v -mmacosx- 
version-min=10.6.0 -fdiagnostics-show-option -o - -x c math.c
clang: error: preprocessor command failed due to signal 11 (use -v to  
see invocation)

Regards

-- Jean-Daniel




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