php-nan-check.patch

diff --git a/Zend/configure.in b/Zend/configure.in
index 2f24abc..50588bb 100644
--- a/Zend/configure.in
+++ b/Zend/configure.in
@@ -75,7 +75,7 @@ int zend_sprintf(char *buffer, const char *format, ...);
 #elif defined(HAVE_FPCLASS)
 #define zend_isnan(a) ((fpclass(a) == FP_SNAN) || (fpclass(a) == FP_QNAN))
 #else
-#define zend_isnan(a) 0
+#define zend_isnan(a) ((a) != (a))
 #endif
 #endif
 
diff --git a/Zend/tests/bug73954.phpt b/Zend/tests/bug73954.phpt
new file mode 100644
index 0000000..a7d9352
--- /dev/null
+++ b/Zend/tests/bug73954.phpt
+--TEST--
+Bug #73954 (NAN check fails on Alpine Linux with musl)
+--FILE--
+<?php
+
+var_dump(NAN);
+var_dump(is_nan(NAN));
+
+function takes_int(int $int) {
+}
+
+takes_int(NAN);
+
+?>
+--EXPECTF--
+float(NAN)
+bool(true)
+
+Fatal error: Uncaught TypeError: Argument 1 passed to takes_int() must be of the type integer, float given, called in %s on line 9 and defined in %s:6
+Stack trace:
+#0 %s(9): takes_int(NAN)
+#1 {main}
+  thrown in %s on line 6
diff --git a/configure.in b/configure.in
index c7edee2..a7d9352 100644
--- a/configure.in
+++ b/configure.in
@@ -80,7 +80,7 @@ int zend_sprintf(char *buffer, const char *format, ...);
 #elif defined(HAVE_FPCLASS)
 #define zend_isnan(a) ((fpclass(a) == FP_SNAN) || (fpclass(a) == FP_QNAN))
 #else
-#define zend_isnan(a) 0
+#define zend_isnan(a) ((a) != (a))
 #endif
 #endif