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clang and clang++ with ASAN generate different output


clang and clang++ with ASAN generate different output

By : Sam
Date : November 19 2020, 03:01 PM
will be helpful for those in need This seems to be a bug in Clang, could you file bug report in their tracker? (EDIT: this was [resolved as not-a-bug](Asan developers https://github.com/google/sanitizers/issues/872) so probly needs to be fixed by Bazel developers instead).
Some details: when you use ordinary clang, it decides not to link C++ part of Asan runtime as can be seen in Tools.cpp:
code :
if (SanArgs.linkCXXRuntimes())
  StaticRuntimes.push_back("asan_cxx");
LinkCXXRuntimes =
    Args.hasArg(options::OPT_fsanitize_link_cxx_runtime) || D.CCCIsCXX();


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How can I generate metadata output with clang similar to that of gcc-xml?

How can I generate metadata output with clang similar to that of gcc-xml?


By : Josevan Vallejo
Date : March 29 2020, 07:55 AM
I hope this helps you . There used to be a way to print an xml dump with Clang but it was more or less supported and has been removed. There are developers options to get a dump at various stages, but the format is for human consumption, and unstable.
The recommendation for Clang users has always been code integration:
what package do I need to use clang with asan for 32 bit?

what package do I need to use clang with asan for 32 bit?


By : Brady Kilpatrick
Date : March 29 2020, 07:55 AM
help you fix your problem With clang 3.7 this seems to be a known problem, see https://llvm.org/bugs/show_bug.cgi?id=22757. With clang 3.6 I could link without a problem.
On Ubuntu these installation instructions worked for me: https://askubuntu.com/a/509223
Clang's ASan does not detect dangling pointer use

Clang's ASan does not detect dangling pointer use


By : Tareq Hadid
Date : March 29 2020, 07:55 AM
wish of those help You are talking about use-after-return errors here. These should be supported by ASan but disabled by default due to significantly higher memory overhead (see e.g. here for details). To enable, run with ASAN_OPTIONS=detect_stack_use_after_return=1.
Unfortunately I can't check whether it works on your particular case but if it doesn't, you should probly file a bug at ASan's tracker.
Stricit aliasing violation: Why gcc and clang generate different output?

Stricit aliasing violation: Why gcc and clang generate different output?


By : user2304251
Date : March 29 2020, 07:55 AM
I hope this helps you .
Why can we say the bar doesn't violate the strict aliasing rule?
code :
int x;
long y;
bar(&x, &y);
long y;
bar((int *) &y, &y);
Arm inline assembly volatile caused compute result error in clang with asan

Arm inline assembly volatile caused compute result error in clang with asan


By : user2449527
Date : March 29 2020, 07:55 AM
may help you . You're modifying an input operand, lying to the compiler.
volatile int nn makes the compiler reload it from memory every time, instead of using the value that's supposed to be still in registers after your asm statement which promised the compiler that [nn] "r" (nn) was an input (read-only) operand.
code :
int nn_tmp = nn;  // the asm destroys this copy
asm ("..."  : [nn] "+r"(nn_tmp) : ...);
int dummy;
asm ("..." : "=r"(dummy)  : [nn] "0" (nn) : ...);
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