Qt工程加入对 C99 支持

QMAKE_CFLAGS += -std=c99        //Qt中加入此句及可支持C99语言

use option -std=c99 or -std=gnu99 to compile your code

QT中有

TEMPLATE = app

CONFIG += console

CONFIG -= app_bundle

CONFIG -= qt

QMAKE_CFLAGS += -std=c99

SOURCES += main.c

C:\Documents and Settings\Administrator\test_1\main.c:14: error: 'for' loop initial declarations are only allowed in C99 mode

C:\Documents and Settings\Administrator\test_1\main.c:14: use option -std=c99 or -std=gnu99 to compile your code

解决方法：在工程的.pro中添加   QMAKE_CFLAGS += -std=c99    然后重新编译即可！