[llvm-bugs] [Bug 25535] New: Programs compiled with optimization and profiling crash

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=25535

            Bug ID: 25535
           Summary: Programs compiled with optimization and profiling
                    crash
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Driver
          Assignee: unassignedclangbugs at nondot.org
          Reporter: sisnkemp at gmail.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

When using profiling (option -pg) in combination with optimizations (e.g. -O3),
compiled programs crash in the profiling routine mcount().
This is because mcount (on x86_64 at least) relies on the frame pointer to be
valid. When optimizations are enabled, however, the frame pointer is
eliminated.

A test case that demonstrates this and a proposed diff to fix this is given at:
http://reviews.llvm.org/D14215

The key is to disable frame-pointer elimination in the driver and the frontend
when the profiling option is provided.

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