https://llvm.org/bugs/show_bug.cgi?id=31257
Bug ID: 31257
Summary: -Oz miscompilation?
Product: new-bugs
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
cppcheck testrunner fails under -Oz with clang/llvm dev.
Source: https://github.com/danmar/cppcheck (tested with 9c69546 of this repo)
To compile and run just execute
make CXX=clang++ CXXFLAGS="-Oz -std=c++0x" testrunner; ./testrunner
With clang 3.8.0 (fedora 24) there are no problems, testrunner succeeds.
With 4.0-dev however there are assertion failures and internal errors which
makes be believe that there is a miscompilation of the compiler.
test failures:
TestType
TestSymbolDatabase
TestOther
TestNullPointer
TestMathLib
TestCondition
TestCharVar
internal errors:
TestBufferOverrun
TestValueFlow
TestTokenizer
TestSimplifyTokens
you can run tests one by one via
./testrunner TestValueFlow
or
./testrunner TestValueFlow::valueFlowCalculations
My rough assumption is that there are differences in how -Oz handles data types
or related checks since in the test suit, some values that were ints became
floats unexpectedly ( ./testrunner TestMathLib )
If you want to know how cppcheck interprets code, run cppcheck file --debug
--verbose
My knowledge of c/c++ is very limited so unfortunately I can't come up with a
reduced example of miscompiled code.
-O0, -O1, -O2, -O3, -Og -Os all show no sign of failures.
llvm @ r288619
clang @ r288614
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