Warnings in GCC disappearing if recompiled or small changes made

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Hi All
 
i have a problem that with our test code we have always produced a #warning
for all test code that the engineers put in the production code.
if you compile the code and then compile again the #warnings are not
reproduced along with other warnings
 
so the issue is that some times a clean or build all does not produce the
warnings in you compilation either
 
we are using the GCC for arm compiler for the kinetis m0 processor
is there a compiler directive that i can put in .... i have looked and
looked but i think that i may be missing the right word to search for
 
Dan



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