error: ld returned 1 exit statuscollect2.exe

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occasionally, 1 error message , many warnings.
the error message utterly useless:

"error      error: ld returned 1 exit status      collect2.exe"

the verbose build output attached. 

my code huge, not going waste (or my) time trying attach it. instead, want understand:

1) causes message?
2) how diagnose cause? i.e. me understand cause?
3) how fix problem?

quote
1) causes message?
errors in code.

quote
2) how diagnose cause?
do not ignore messages come before last 1 (that show).

quote
i.e. me understand cause?
the messages come before one.

quote
3) how fix problem?
fix errors precede it.


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