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Question

我将-g选项添加到makefile中，如下所示：

CFLAGS=-Wall -g

all:
        cc hello.c -o hello
        cc badprog.c -o badprog

当我使用make编译时：

 cc hello.c -o hello
 cc badprog.c -o badprog

我不认为-g选项here.The结果的valgrind --track-origins=yes ./badprog如下所示：

 ==14412== Conditional jump or move depends on uninitialised value(s)
 ==14412==    at 0x4E7D665: _itoa_word (_itoa.c:179)
 ==14412==    by 0x4E81B91: vfprintf (vfprintf.c:1654)
 ==14412==    by 0x4E880A8: printf (printf.c:34)
 ==14412==    by 0x400564: main (in /home/anr/Desktop/c programming/badprog)
 ==14412==  Uninitialised value was created by a stack allocation
 ==14412==    at 0x40052C: main (in /home/anr/Desktop/c programming/badprog)

Answer 1

因为编译命令中没有引用CFLAGS。将Makefile修改为：

CFLAGS=-Wall -g

all:
        cc hello.c $(CFLAGS) -o hello
        cc badprog.c $(CFLAGS) -o badprog