GCC option to create assembly listing with C source

[Johannes Krottmayer via Gcc-help <gcc-help@xxxxxxxxxxx>]

Hi!

I have some troubles on a project when I enable optimizing (-O2). The 
code works without optimizing. To fix this issue I need to know, the 
correct line in my C code, where the issue persist.

Is there an option to produce an output from the assembled code WITH
the C code? There exists the option -S, but I only outputs the assembly.

AFAIK, there exists an option at least for the AVR port on older (???) 
GCC versions, but I have unfortunately forgotten the correct option.

Thanks in advance!

Kind regards,

Johannes

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