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* assert: allow non-int returning functions to assertethomson/assert_macrosEdward Thomson2020-05-111-14/+21
| | | | | | | | | | Include GIT_ASSERT_WITH_RETVAL and GIT_ASSERT_ARG_WITH_RETVAL so that functions that do not return int (or more precisely, where `-1` would not be an error code) can assert. This allows functions that return, eg, NULL on an error code to do that by passing the return value (in this example, `NULL`) as a second parameter to the GIT_ASSERT_WITH_RETVAL functions.
* assert: optionally fall-back to assert(3)Edward Thomson2020-05-111-0/+51
Fall back to the system assert(3) in debug builds, which may aide in debugging. "Safe" assertions can be enabled in debug builds by setting GIT_ASSERT_HARD=0. Similarly, hard assertions can be enabled in release builds by setting GIT_ASSERT_HARD to nonzero.