[PATCH v3 10/11] telemetry: disable json print formatting with msvc

[Tyler Retzlaff]

VLAs are unsafe and will never be implemented in MSVC. When compiling
with MSVC just return immediately indicating 0 output characters
formatted.

For now telemetry doesn't work on Windows, we will revisit support for
the telemetry library sometime after we establish the DPDK unit tests.

Signed-off-by: Tyler Retzlaff <roret...@linux.microsoft.com>
---
 lib/telemetry/telemetry_json.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/lib/telemetry/telemetry_json.h b/lib/telemetry/telemetry_json.h
index 744bbfe..d847003 100644
--- a/lib/telemetry/telemetry_json.h
+++ b/lib/telemetry/telemetry_json.h
@@ -30,6 +30,7 @@
 static inline int
 __json_snprintf(char *buf, const int len, const char *format, ...)
 {
+#ifndef RTE_TOOLCHAIN_MSVC
        char tmp[len];
        va_list ap;
        int ret;
@@ -41,6 +42,7 @@
                strcpy(buf, tmp);
                return ret;
        }
+#endif
        return 0; /* nothing written or modified */
 }
 
@@ -60,6 +62,7 @@
 static inline int
 __json_format_str(char *buf, const int len, const char *prefix, const char 
*str, const char *suffix)
 {
+#ifndef RTE_TOOLCHAIN_MSVC
        char tmp[len];
        int tmpidx = 0;
 
@@ -98,6 +101,9 @@
 
        strcpy(buf, tmp);
        return tmpidx;
+#else
+       return 0;
+#endif
 }
 
 /* Copies an empty array into the provided buffer. */
-- 
1.8.3.1