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我是新成員，作爲此論壇。我的問題是關於兩個版本的gcc編譯器給我不同的結果。 gcc版本4.9.2編譯並運行時沒有核心轉儲。但是，海灣合作委員會版本5.3編譯沒有任何警告，但執行轉儲核心。如果有人能夠啓發我的不同，我將非常感激。我已經嘗試過用malloc，它通過兩個gcc版本導致更多的錯誤。提前致謝。請閱讀下面的更多細節。Valgrind - 所有分配的內存已釋放，仍然無效
有問題的版本
1. gcc版本4.9.2 20150212（紅帽4.9.2-6）（GCC）（Fedora的21 - 3.19.5-200.fc21.i686） - Valgrind的3.10
2. gcc版本5.3.1 20151207（紅帽5.3.1-2）（GCC）（Fedora的23 - 4.2.3-300.fc23.x86_64） - Valgrind的3.11
的代碼片段給出如下：
#include <stdio.h>
#include <string.h>
#include <strings.h>
#include <stdlib.h>
char *somval[12][2] =
{
{"one", "ONE"},
{"two", "TWO"},
{"three", "THREE"},
{"four", "FOUR"},
{"five", "FIVE"},
{"six", "SIX"},
{"seven", "SEVEN"},
{"eight", "EIGHT"},
{"nine", "NINE"},
{"ten", "TEN"},
{NULL, NULL}
};
typedef struct _getval
{
char **val1;
char **val2;
}GETVAL;
int main()
{
int i;
GETVAL *getval;
getval = calloc(1, sizeof(GETVAL));
getval->val1 = calloc(12, sizeof(int));
getval->val2 = calloc(12, sizeof(int));
for(i = 0; somval[i][1] != NULL; i++)
{
getval->val1[i] = calloc(101, sizeof(int));
getval->val1[i] = somval[i][0];
getval->val2[i] = somval[i][1];
printf("%s = %s\n", getval->val1[i], getval->val2[i]);
}
for(i = 0; somval[i][1] != NULL; i++)
{
free(getval->val1[i]);
}
free(getval->val1);
free(getval->val2);
free(getval);
return 0;
}
Compile the program with gcc or cc and valgrind ./a.out gives the following on gcc version 4.92. The program runs fine without a core dump and executed without valgrind.
==4818== Memcheck, a memory error detector
==4818== Copyright (C) 2002-2013, and GNU GPL'd, by Julian Seward et al.
==4818== Using Valgrind-3.10.1 and LibVEX; rerun with -h for copyright info
==4818== Command: ./a.out
==4818==
one = ONE
two = TWO
three = THREE
four = FOUR
five = FIVE
six = SIX
seven = SEVEN
eight = EIGHT
nine = NINE
ten = TEN
==4818== Invalid free()/delete/delete[]/realloc()
==4818== at 0x40082CD: free (in /usr/lib/valgrind/vgpreload_memcheck-x86-linux.so)
==4818== by 0x80485A1: main (in /users/netha/NTFiles/progs/cprog/test/a.out)
==4818== Address 0x8048684 is not stack'd, malloc'd or (recently) free'd
==4818==
==4818==
==4818== HEAP SUMMARY:
==4818== in use at exit: 4,040 bytes in 10 blocks
==4818== total heap usage: 13 allocs, 13 frees, 4,144 bytes allocated
==4818==
==4818== LEAK SUMMARY:
==4818== definitely lost: 4,040 bytes in 10 blocks
==4818== indirectly lost: 0 bytes in 0 blocks
==4818== possibly lost: 0 bytes in 0 blocks
==4818== still reachable: 0 bytes in 0 blocks
==4818== suppressed: 0 bytes in 0 blocks
==4818== Rerun with --leak-check=full to see details of leaked memory
==4818==
==4818== For counts of detected and suppressed errors, rerun with: -v
==4818== ERROR SUMMARY: 10 errors from 1 contexts (suppressed: 0 from 0)
----------------------------------------------------
Compile the program with gcc or cc and valgrind ./a.out gives the following on gcc version 5.3. The program runs fine without a core dump and executed with valgrind. Otherwise, the program dumps core without valgrind.
==29481== Memcheck, a memory error detector
==29481== Copyright (C) 2002-2015, and GNU GPL'd, by Julian Seward et al.
==29481== Using Valgrind-3.11.0 and LibVEX; rerun with -h for copyright info
==29481== Command: ./a.out
==29481==
one = ONE
two = TWO
three = THREE
four = FOUR
five = FIVE
six = SIX
==29481== Invalid write of size 8
==29481== at 0x400645: main (in /XtraStorage/netha/jayami/progs/cprog/gtk_examples/a.out)
==29481== Address 0x51f60c0 is 0 bytes after a block of size 48 alloc'd
==29481== at 0x4C2AA98: calloc (vg_replace_malloc.c:711)
==29481== by 0x4005F0: main (in /XtraStorage/netha/jayami/progs/cprog/gtk_examples/a.out)
==29481==
==29481== Invalid write of size 8
==29481== at 0x40066E: main (in /XtraStorage/netha/jayami/progs/cprog/gtk_examples/a.out)
==29481== Address 0x51f60c0 is 0 bytes after a block of size 48 alloc'd
==29481== at 0x4C2AA98: calloc (vg_replace_malloc.c:711)
==29481== by 0x4005F0: main (in /XtraStorage/netha/jayami/progs/cprog/gtk_examples/a.out)
==29481==
==29481== Invalid write of size 8
==29481== at 0x400698: main (in /XtraStorage/netha/jayami/progs/cprog/gtk_examples/a.out)
==29481== Address 0x51f6130 is 0 bytes after a block of size 48 alloc'd
==29481== at 0x4C2AA98: calloc (vg_replace_malloc.c:711)
==29481== by 0x400609: main (in /XtraStorage/netha/jayami/progs/cprog/gtk_examples/a.out)
==29481==
==29481== Invalid read of size 8
==29481== at 0x4006B0: main (in /XtraStorage/netha/jayami/progs/cprog/gtk_examples/a.out)
==29481== Address 0x51f6130 is 0 bytes after a block of size 48 alloc'd
==29481== at 0x4C2AA98: calloc (vg_replace_malloc.c:711)
==29481== by 0x400609: main (in /XtraStorage/netha/jayami/progs/cprog/gtk_examples/a.out)
==29481==
==29481== Invalid read of size 8
==29481== at 0x4006C7: main (in /XtraStorage/netha/jayami/progs/cprog/gtk_examples/a.out)
==29481== Address 0x51f60c0 is 0 bytes after a block of size 48 alloc'd
==29481== at 0x4C2AA98: calloc (vg_replace_malloc.c:711)
==29481== by 0x4005F0: main (in /XtraStorage/netha/jayami/progs/cprog/gtk_examples/a.out)
==29481==
seven = SEVEN
eight = EIGHT
nine = NINE
ten = TEN
==29481== Invalid free()/delete/delete[]/realloc()
==29481== at 0x4C29E00: free (vg_replace_malloc.c:530)
==29481== by 0x400722: main (in /XtraStorage/netha/jayami/progs/cprog/gtk_examples/a.out)
==29481== Address 0x400810 is in a r-x mapped file /XtraStorage/netha/jayami/progs/cprog/gtk_examples/a.out segment
==29481==
==29481== Invalid read of size 8
==29481== at 0x400718: main (in /XtraStorage/netha/jayami/progs/cprog/gtk_examples/a.out)
==29481== Address 0x51f60c0 is 0 bytes after a block of size 48 alloc'd
==29481== at 0x4C2AA98: calloc (vg_replace_malloc.c:711)
==29481== by 0x4005F0: main (in /XtraStorage/netha/jayami/progs/cprog/gtk_examples/a.out)
==29481==
==29481==
==29481== HEAP SUMMARY:
==29481== in use at exit: 4,040 bytes in 10 blocks
==29481== total heap usage: 13 allocs, 13 frees, 4,152 bytes allocated
==29481==
==29481== LEAK SUMMARY:
==29481== definitely lost: 4,040 bytes in 10 blocks
==29481== indirectly lost: 0 bytes in 0 blocks
==29481== possibly lost: 0 bytes in 0 blocks
==29481== still reachable: 0 bytes in 0 blocks
==29481== suppressed: 0 bytes in 0 blocks
==29481== Rerun with --leak-check=full to see details of leaked memory
==29481==
==29481== For counts of detected and suppressed errors, rerun with: -v
==29481== ERROR SUMMARY: 34 errors from 7 contexts (suppressed: 0 from 0)