patch 8.0.1681: the format attribute fails with MinGWv8.0.1681

Problem:    The format attribute fails with MinGW. (John Marriott)
Solution:   Don't use the format attribute with MinGW.

4 files changed, 11 insertions, 5 deletions

diff --git a/src/channel.c b/src/channel.c
index 0f2e52b97..88c53b7e0 100644
--- a/src/channel.c
+++ b/src/channel.c
@@ -179,8 +179,8 @@ ch_log(channel_T *ch, const char *fmt, ...)
 
     static void
 ch_error(channel_T *ch, const char *fmt, ...)
-#ifdef __GNUC__
-__attribute__((format(printf, 2, 3)))
+#ifdef USE_PRINTF_FORMAT_ATTRIBUTE
+    __attribute__((format(printf, 2, 3)))
 #endif
     ;
 
diff --git a/src/proto.h b/src/proto.h
index 231c53f3b..655b72cac 100644
--- a/src/proto.h
+++ b/src/proto.h
@@ -120,7 +120,7 @@ int
 _RTLENTRYF
 #  endif
 vim_snprintf_add(char *, size_t, char *, ...)
-#ifdef __GNUC__
+#ifdef USE_PRINTF_FORMAT_ATTRIBUTE
     __attribute__((format(printf, 3, 4)))
 #endif
     ;
@@ -130,7 +130,7 @@ int
 _RTLENTRYF
 #  endif
 vim_snprintf(char *, size_t, char *, ...)
-#ifdef __GNUC__
+#ifdef USE_PRINTF_FORMAT_ATTRIBUTE
     __attribute__((format(printf, 3, 4)))
 #endif
     ;
@@ -223,7 +223,7 @@ void qsort(void *base, size_t elm_count, size_t elm_size, int (*cmp)(const void
 
 /* Not generated automatically, to add extra attribute. */
 void ch_log(channel_T *ch, const char *fmt, ...)
-#ifdef __GNUC__
+#ifdef USE_PRINTF_FORMAT_ATTRIBUTE
     __attribute__((format(printf, 2, 3)))
 #endif
     ;
diff --git a/src/version.c b/src/version.c
index f0a21b335..d162de5e8 100644
--- a/src/version.c
+++ b/src/version.c
@@ -763,6 +763,8 @@ static char *(features[]) =
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1681,
+/**/
     1680,
 /**/
     1679,
diff --git a/src/vim.h b/src/vim.h
index 626c0ad12..4b4185790 100644
--- a/src/vim.h
+++ b/src/vim.h
@@ -2085,6 +2085,10 @@ typedef struct _stat64 stat_T;
 typedef struct stat stat_T;
 #endif
 
+#if defined(__GNUC__) && !defined(__MINGW32__)
+# define USE_PRINTF_FORMAT_ATTRIBUTE
+#endif
+
 typedef enum
 {
     ASSERT_EQUAL,