https://bugs.llvm.org/show_bug.cgi?id=40322
Bug ID: 40322
Summary: clang generates incorrect unwind information on 32-bit
mingw
Product: new-bugs
Version: 7.0
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: unassignedb...@nondot.org
Reporter: m...@groundctl.com
CC: htmldevelo...@gmail.com, llvm-bugs@lists.llvm.org
Created attachment 21330
--> https://bugs.llvm.org/attachment.cgi?id=21330&action=edit
attached program
When compiling the attached program with the arguments "-target
i686-w64-mingw32 -O2", the resulting executable aborts. When compiling with
"-target i686-w64-mingw32 -O0" the executable works correctly.
This appears to be because the generated dwarf unwind information is incorrect.
When the unwinder looks for the return address of "am" it is off by 4 bytes
and finds the argument to "am", which is 0, and so it thinks the stack has
ended.
I am using the current Arch Linux clang build, version "7.0.1
(tags/RELEASE_701/final)". This does not happen when targeting
"x86_64-w64-mingw32". This does not happen when using -O1.
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