comparison between signed and unsigned integer

And Sch andsch at
Mon Oct 13 16:47:30 CEST 2014

I recently added '-Wextra' to my compile flags and I get many of the following
warnings when compiling libgcrypt.

warning: comparison between signed and unsigned integer expressions [-Wsign-compare]

I have looked through them all and most of them are comparing a signed counter
with size_t or unsigned int, which should be benign. However, researching the
warning there are certain nasty bugs that appear if the signed int is ever

Now, Werner Koch said in the bug tracker that fixing this may introduce bugs, and I would agree. It probably wouldn't be worthwhile because there are no obvious bugs ATM.

However, here is my second proposal, why not add a call to assert() before the comparison to make sure the signed int is not negative. This shouldn't introduce any bugs AFAIK, and can be turned off globally.

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