From: cgw AT pgt DOT com (Charles G Waldman)
Subject: BUG in function parameter passing ??????
28 Aug 1998 00:09:16 -0700
Message-ID: <13798.2205.894237.157257.cygnus.gnu-win32@sirius>
References: <98082711213612 AT psicla DOT psi DOT ch>
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To: Mark DOT Koennecke AT psi DOT ch
Cc: GNU-WIN32 AT cygnus DOT com

Mark DOT Koennecke AT psi DOT ch writes:
 > 
 > int main(int argc, char *argv[])
 > {
 >   char pBuffer[132];
 >   
 >   /* why does this work? */
 >   strcpy(pBuffer,"Hello You");
 >   strtolower(pBuffer);
 >   
 >   /* but this gives a segmentation violation under Cygwin*/
 >   strtolower("Hello You");
 >   


Because the string "Hello You" is a constant, and is allocated in the
read-only segment of the executable.  The buffer pBuffer is allocated
read/write.   This is done so that storage for literal strings can be
shared between object files.

There's a compiler option to turn off this behavior.  Try adding
-fwritable-strings to your compilation flags.


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