Sorry if I am more terse this time. Also, these questions are now more suited for the gcc-help list, rather than this one which is for development of GCC itself.

# 1 "test.c"
# 1 " "
# 1 " "
# 1 "test.c"

What do these represent?

Try "info cpp", and search for "Preprocessor Output".

Kindly elaborate on algn.The alignment required by the type relative to what 
and why?

Google gives wonderful answers (try these keywords: data alignment)

Paolo

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