Bug 105655 - segmentation fault on evaluating expr. --*(ptr--)
segmentation fault on evaluating expr. --*(ptr--)
Status: CLOSED NOTABUG
Product: Red Hat Linux
Classification: Retired
Component: gcc (Show other bugs)
9
i686 Linux
medium Severity medium
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Assigned To: Jakub Jelinek
David Lawrence
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Depends On:
Blocks:
  Show dependency treegraph
 
Reported: 2003-09-26 07:46 EDT by ashish
Modified: 2007-04-18 12:57 EDT (History)
0 users

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Doc Type: Bug Fix
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Last Closed: 2003-09-26 08:12:38 EDT
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Description ashish 2003-09-26 07:46:53 EDT
From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.0.1) Gecko/20020830

Description of problem:
When I compiled following program and executed it gives "segmentation fault" error

main()
{
char *ptr = "abcdefg";
printf("\n%c\n",--*(ptr--));
}


Version-Release number of selected component (if applicable):
gcc-3.2.2-5

How reproducible:
Didn't try


Additional info:
Comment 1 Jakub Jelinek 2003-09-26 08:12:38 EDT
And you expected something else?
See ISO C99, 6.4.5 on string literals:
... "If the program attempts to modify such an array, the behavior is undefined." ...
String literals in gcc are in read-only sections if the target supports it.
You can use -fwritable-strings to make them writable (which also means non-shareable).

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