add reference to clang-tidy in README

README.md

@@ -262,6 +262,16 @@ Overall, I would caution that if you really care about the very far tails of dis
 
 In fact, squiggle.c does have a few functions for algebraic manipulations of simple distributions at the end of squiggle.c. But these are pretty rudimentary, and I don't know whether I'll end up expanding or deleting them.
 
+### Results of running clang-tidy
+
+clang-tidy is a utility to detect common errors in C/C++. You can run it with:
+
+```
+make tidy
+```
+
+It emits one warning about something I already took care of, so by default I've suppressed it. I think this is good news in terms of making me more confident that this simple library is correct :).
+
 ## Related projects
 
 - [Squiggle](https://www.squiggle-language.com/)
@@ -274,7 +284,7 @@ In fact, squiggle.c does have a few functions for algebraic manipulations of sim
 
 - [ ] Think about whether to write a simple version of this for [uxn](https://100r.co/site/uxn.html), a minimalistic portable programming stack which, sadly, doesn't have doubles (64 bit floats)
 - [ ] Point out that, even though the C standard is ambiguous about this, this code assumes that doubles are 64 bit precision (otherwise the xorshift should be different).
-- [ ] Document rudimentary algebra manipulations
+- [ ] Document rudimentary algebra manipulations for normal/lognormal
 - [ ] Think through whether to delete cdf => samples function
 - [ ] Think through whether to:
   - simplify and just abort on error

makefile

@@ -17,3 +17,5 @@ format: squiggle.c squiggle.h
 	$(FORMATTER) squiggle.c
 	$(FORMATTER) squiggle.h
 
+lint:
+	clang-tidy squiggle.c -- -lm

squiggle.c

@@ -217,7 +217,7 @@ struct box process_error(const char* error_msg, int should_exit, char* file, int
         exit(1);
     } else {
         char error_msg[MAX_ERROR_LENGTH];
-        snprintf(error_msg, MAX_ERROR_LENGTH, "@, in %s (%d)", file, line);
+        snprintf(error_msg, MAX_ERROR_LENGTH, "@, in %s (%d)", file, line); // NOLINT: We are being carefull here by considering MAX_ERROR_LENGTH explicitly.
         struct box error = { .empty = 1, .error_msg = error_msg };
         return error;
     }