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-rw-r--r--tools/m4/patches/001-fix-macos-vasnprintf.patch25
1 files changed, 25 insertions, 0 deletions
diff --git a/tools/m4/patches/001-fix-macos-vasnprintf.patch b/tools/m4/patches/001-fix-macos-vasnprintf.patch
new file mode 100644
index 0000000000..e41315d34e
--- /dev/null
+++ b/tools/m4/patches/001-fix-macos-vasnprintf.patch
@@ -0,0 +1,25 @@
+--- a/lib/vasnprintf.c
++++ b/lib/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,