How to get preprocessed C++ code from DevC++ under Windows XP? I've read about creating gcc -E file.cpp file, but I still can't connect the dots, how to run this file? After I've compiled it everything went as usual.
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Brian Tompsett - 汤莱恩
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Qbik
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2 Answers
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You simply can't 'run' a preprocessed file. You can just compile and run it, or inspect it for what the preprocessor produced.
E.g. when using GCC you can run
gcc file.cpp -E <all preprocessor options as set from the IDE> -o file_preprocessed.cpp
to get the file_preprocessed.cpp file for inspection.
I don't know for the dev-c++ IDE in particular, but usually you'll get a representation of the actually used compiler flags of a project in the project settings somewhere.
πάντα ῥεῖ
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I don't want run it I just want to see effects of preprocessing, mayby I should be more clear, could you give me any clues how to do this ? – Qbik Feb 27 '13 at 19:36
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See my comment on @zacaj's answer. – πάντα ῥεῖ Feb 27 '13 at 20:08
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Dev-C++ has an option in Tools > Compiler Options... > General to add commands when calling the compiler. – Kyle Delaney Aug 18 '16 at 03:45
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run
gcc file.cpp -E -o file_preprocessed.cpp
then you can open file_preprocessed.cpp to see the output
zacaj
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@Qbik yes at least run it through console and ensure passing all (preprocessor relevant) options you have set in your IDE. – πάντα ῥεῖ Feb 27 '13 at 20:07