我編譯工程的時候，出現下面錯誤，應該怎么解決呢？懇請大佬幫忙解答
../lib/libc.a(lib_a-svfprintf.o):(.literal+0x10): undefined reference to `_malloc_r'
../lib/libc.a(lib_a-svfprintf.o): In function `_svfprintf_r':
/home/wjg/Repo/esp-open-sdk-20170622/crosstool-NG/.build/src/newlib-2.0.0/newlib/libc/stdio/vfprintf.c:733: undefined reference to `_malloc_r'
../lib/libc.a(lib_a-svfiprintf.o):(.literal+0x4): undefined reference to `_realloc_r'
../lib/libc.a(lib_a-svfiprintf.o):(.literal+0x8): undefined reference to `_free_r'
../lib/libc.a(lib_a-svfiprintf.o): In function `__ssprint_r':
/home/wjg/Repo/esp-open-sdk-20170622/crosstool-NG/.build/src/newlib-2.0.0/newlib/libc/stdio/vfprintf.c:234: undefined reference to `_malloc_r'
/home/wjg/Repo/esp-open-sdk-20170622/crosstool-NG/.build/src/newlib-2.0.0/newlib/libc/stdio/vfprintf.c:245: undefined reference to `_realloc_r'
/home/wjg/Repo/esp-open-sdk-20170622/crosstool-NG/.build/src/newlib-2.0.0/newlib/libc/stdio/vfprintf.c:249: undefined reference to `_free_r'
../lib/libc.a(lib_a-svfiprintf.o): In function `_svfiprintf_r':
/home/wjg/Repo/esp-open-sdk-20170622/crosstool-NG/.build/src/newlib-2.0.0/newlib/libc/stdio/vfprintf.c:733: undefined reference to `_malloc_r'
collect2: error: ld returned 1 exit status
uj5u.com熱心網友回復：
#include "stdio.h"sprintf (buffer, "已經收到\r\nDTH11 H:%d,T:%d\r\n", shidu,wendu);
espconn_sent((struct espconn *)arg,buffer,strlen(buffer));
大佬們，我把工程里的這三條陳述句注釋掉就沒有問題了，我這三條陳述句是不是有問題？
uj5u.com熱心網友回復：
大佬們，我發現如果我注釋掉這條陳述句就沒有錯誤了。我該怎么改，才不會報錯啊
sprintf (buffer, "已經收到\r\nDTH11 H:%d,T:%d\r\n", shidu,wendu);
uj5u.com熱心網友回復：
https://bbs.espressif.com/viewtopic.php?t=404https://www.esp8266.com/viewtopic.php?f=28&t=2173
參見一下這兩個連接，別#include <stdio.h>等C標準庫，用ESP8266的"osapi.h"庫，sprintf用os_sprintf替代
希望能幫到你
uj5u.com熱心網友回復：
這幾句都沒有問題，你應該是別的問題引起的問題
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