Hello, Valgrind reports "invalid read" in my program, but only if I compile it with -O3 and not if I compile it with -O2, -O1 or -O0. The -g option doesn't change this. Is it possible that valgrind reports false positives if the -O3 option is used? If yes, how can I confirm this message is indeed a false positive?
I couldn't find anything in the documentation except for this quote from https://valgrind.org/docs/manual/quick-start.html: Compile your program with |-g| to include debugging information so that Memcheck's error messages include exact line numbers. Using |-O0| is also a good idea, if you can tolerate the slowdown. With |-O1| line numbers in error messages can be inaccurate, although generally speaking running Memcheck on code compiled at |-O1| works fairly well, and the speed improvement compared to running |-O0| is quite significant. Use of |-O2| and above is not recommended as Memcheck occasionally reports uninitialised-value errors which don't really exist. But here, they only talk about uninitialised-value's and not about invalid-reed's. Greetings Volker Weißmann
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