DEP: drop older cygwin compatibility shims (#22159)

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numpy · Aug 21, 2022 · a36783e · a36783e
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diff --git a/doc/release/upcoming_changes/22159.expired.rst b/doc/release/upcoming_changes/22159.expired.rst
@@ -0,0 +1 @@
+* Support for cygwin < 3.3 has been removed.
diff --git a/numpy/core/src/common/npy_config.h b/numpy/core/src/common/npy_config.h
@@ -138,18 +138,8 @@
 
 #include <cygwin/version.h>
 #if CYGWIN_VERSION_DLL_MAJOR < 3003
-/* https://cygwin.com/pipermail/cygwin-announce/2021-October/010268.html */
-/* Builtin abs reports overflow */
-#undef HAVE_CABSL
-#undef HAVE_HYPOTL
-#endif
-
-#if CYGWIN_VERSION_DLL_MAJOR < 3002
-/* https://cygwin.com/pipermail/cygwin-announce/2021-March/009987.html */
-/* Segfault */
-#undef HAVE_MODFL
-/* sqrt(-inf) returns -inf instead of -nan */
-#undef HAVE_SQRTL
+// rather than blocklist cabsl, hypotl, modfl, sqrtl, error out
+#error cygwin < 3.3 not supported, please update
 #endif
 #endif