error: ‘for’ loop initial declarations are only allowed in C99 mode
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比如写出下面这段程序：
for (int i = 0; i < n; ++i)
do_something();
然后用gcc编译，会报 ‘for’ loop initial declarations are only allowed in C99 mode的错误。
原因是在循环条件中声明变量的话，只在C99标准中支持，C90标准不支持。
所以改成:
int i;
for (i = 0; i < n; ++i)
do_something();
这样编译就可以通过了。
原文地址：http://www.cnblogs.com/306b/archive/2012/12/11/2812545.html
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