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added a switch -d:nimEmulateOverflowChecks for broken or old GCC versions (#13692)

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Andreas Rumpf 2020-03-19 09:56:30 +01:00 • committed by GitHub
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@ -3,6 +3,12 @@
## Changes affecting backwards compatibility
- The Nim compiler now implements a faster way to detect overflows based
on GCC's `__builtin_sadd_overflow` family of functions. (Clang also
supports these). Some versions of GCC lack this feature and unfortunately
we cannot detect this case reliably. So if you get compilation errors like
"undefined reference to '__builtin_saddll_overflow'" compile your programs
with `-d:nimEmulateOverflowChecks`.
### Breaking changes in the standard library