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--- a/gnu/vasnprintf.c
+++ b/gnu/vasnprintf.c
@@ -4858,7 +4858,11 @@ VASNPRINTF (DCHAR_T *resultbuf, size_t *
#endif
*fbp = dp->conversion;
#if USE_SNPRINTF
-# if !(((__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 3)) && !defined __UCLIBC__) || ((defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__))
+# if ! (((__GLIBC__ > 2 \
+ || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 3)) \
+ && !defined __UCLIBC__) \
+ || (defined __APPLE__ && defined __MACH__) \
+ || ((defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__))
fbp[1] = '%';
fbp[2] = 'n';
fbp[3] = '\0';
@@ -4872,6 +4876,9 @@ VASNPRINTF (DCHAR_T *resultbuf, size_t *
in format strings in writable memory may crash the program
(if compiled with _FORTIFY_SOURCE=2), so we should avoid it
in this situation. */
+ /* macOS 10.13 High Sierra behaves like glibc with
+ _FORTIFY_SOURCE=2, and older macOS releases
+ presumably do not need %n. */
/* On native Windows systems (such as mingw), we can avoid using
%n because:
- Although the gl_SNPRINTF_TRUNCATION_C99 test fails,
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