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cb951303
PostPosted: 01.04.2009, 16:49 
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Joined: 01.04.2009, 16:46
Posts: 9
Hello, this is not a bug but I thought like sharing anyway.

gcc 4.3.2 gives a lot of this warning while building Horde 3D 1.0.0 beta 3 on linux: ...warning: deprecated conversion from string constant to ‘char*’

it's not important and it can be turned off with a simple -Wno-write-strings flag to the compiler line

cheers
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phoenix64
PostPosted: 01.04.2009, 21:02 
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Joined: 15.06.2008, 11:21
Posts: 166
Location: Germany
I had a simple hackfix for this using some simple casts from const char* to char*, was only < 10 lines, I lost it though -.-

It's really a simple issue.
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marciano
PostPosted: 02.04.2009, 21:26 
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Joined: 10.09.2006, 15:52
Posts: 1217
If one of you guys has a little patch we are happy to integrate it :)
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cb951303
PostPosted: 02.04.2009, 22:54 
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Joined: 01.04.2009, 16:46
Posts: 9
sure

PS: Note that according to cmake docs IF(UNIX) also takes care of MacOS (which uses gcc too)


Attachments:
File comment: apply on horde3d root dir with patch -p0
gccwpatch.patch [838 Bytes]
Downloaded 722 times
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marciano
PostPosted: 04.04.2009, 14:05 
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Posts: 1217
Thanks, but this just seems to disable the warning and does not fix it.
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swiftcoder
PostPosted: 04.04.2009, 16:10 
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Joined: 22.11.2007, 17:05
Posts: 707
Location: Boston, MA
cb951303 wrote:
gcc 4.3.2 gives a lot of this warning while building Horde 3D 1.0.0 beta 3 on linux: ...warning: deprecated conversion from string constant to ‘char*’
String constants are typically not writeable (and may be shared), so you should always treat them as const char *
Quote:
it's not important and it can be turned off with a simple -Wno-write-strings flag to the compiler line
That merely hides the problem, without fixing it. If you pass a string constant to a function as char *, then the function is allowed to modify the string, and this will cause a segfault.

We should track down all string functions, and make sure that they take const char * unless they actually modify the string.

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Tristam MacDonald - [swiftcoding]
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cb951303
PostPosted: 04.04.2009, 16:40 
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Posts: 9
marciano wrote:
Thanks, but this just seems to disable the warning and does not fix it.


it's really a gcc dumbness more than an error but anyway :D here is the fixed code patch against svn


Attachments:
cstr2chr.patch [968 Bytes]
Downloaded 712 times
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swiftcoder
PostPosted: 04.04.2009, 19:37 
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Joined: 22.11.2007, 17:05
Posts: 707
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cb951303 wrote:
it's really a gcc dumbness more than an error but anyway :D
It is an error - in fact, failure_reason should probably be a const char * as well. Desktop operating systems tend to be very lenient about things such as writing into sting constants, but you won't be so lucky everywhere.

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Volker
PostPosted: 05.04.2009, 08:49 
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Joined: 13.11.2007, 11:07
Posts: 1150
Location: Germany
So is there any reason why we don't use const char* everywhere?

Can someone with a GCC and/or MinGW compiler test the following patch?


Attachments:
cstr2chr.patch [1.61 KiB]
Downloaded 769 times
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cb951303
PostPosted: 05.04.2009, 10:16 
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Posts: 9
Volker wrote:
So is there any reason why we don't use const char* everywhere?

Can someone with a GCC and/or MinGW compiler test the following patch?


you're right there is no reason to make unnecessary type casts :o
it compiles without warnings with gcc 4.3.2

Code:
Scanning dependencies of target Horde3D
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Linking C static library libglfw.a
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Scanning dependencies of target Chicago
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Scanning dependencies of target Terrain
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Linking CXX executable ../../../Horde3D/Binaries/Linux/Terrain
[100%] Built target Terrain
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Volker
PostPosted: 05.04.2009, 10:51 
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Joined: 13.11.2007, 11:07
Posts: 1150
Location: Germany
Thanks for testing it. I committed it to the SVN.
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