[sword-devel] SWORD 1.7.0RC2

Troy A. Griffitts scribe at crosswire.org
Tue Aug 6 09:12:58 MST 2013

Yes, quick lookup and paste for an example, but the problem is the same 
regardless of my mention of vtable:  The classes are different between 
the compiled objects and this is not a safe situation.

My only mention of this is to show that we're not simply speaking of 
obtaining version information when discussion whether or not to use 

As I mentioned to Greg, my initial intent was to give you the define for 
which you asked in swversion.h but didn't want a 3rd place to have to 
change the version number for our package.  I'm happy to generate 
something with the autotools build system, but Greg would probably have 
to follow suite in coordination, or otherwise always rely on autotools 
generating this and we'll commit the generated file into the package, as 
we currently do with config.h.

Regarding saving compile flags in a, e.g., swbuildoptions.h, I'm not 
amiss to this either, but this again would need to be coordinated 
between the autotools and the cmake builds.

I am still of the impression that pkg-config is the right way to solve 
this problem, and the system which don't have pkg-config don't have a 
problem to solve.

e.g., you are grabbing the source for SWORD and installing it and 
compiling it yourself.  You know exactly which options you've chosen to 
compile with, and you know exactly which version of SWORD you grabbed.

In conclusion, I'm not against adding a new version define to 
swversion.h  But we need to coordinate something between the make system 


On 08/06/2013 04:29 PM, Jaak Ristioja wrote:
> Hash: SHA1
> On 06.08.2013 16:05, Troy A. Griffitts wrote:
>> For example, consider the following code:
>> class Q_CORE_EXPORT QString { public: ... #ifndef QT_NO_REGEXP int
>>   indexOf(const QRegExp &, int from = 0) const; int
>> lastIndexOf(const QRegExp &, int from = -1) const; inline QBool
>> contains(const QRegExp &rx) const { return QBool(indexOf(rx) !=
>> -1); } int count(const QRegExp &) const;
>> int indexOf(QRegExp &, int from = 0) const; int lastIndexOf(QRegExp
>> &, int from = -1) const; inline QBool contains(QRegExp &rx) const {
>> return QBool(indexOf(rx) != -1); } #endif
>> ...
>> If this library was compiled with QT_NO_REGEXP defined, and you
>> include this header file in your project and build without
>> QT_NO_REGEXP defined, then your .o files will expect different
>> vtables than what are provided by the compiled library.
> Ok, I think I must have misunderstood where the discussion ended up.
> First of all since none of the functions in that #ifndef block are
> virtual, there's no difference in the vtable. Secondly, during
> compilation time the situation you just described can be better
> circumvented in ways not requiring passing -Ddefines via pkg-config
> (see Greg's reply about config.h files). Thirdly, one usually gets a
> runtime warning like "Symbol _XTV1MyClass has different size in shared
> object, consider re-linking", or a dynamic linking error which
> prevents the program from starting. Proper precautions can be taken
> for most such cases to prevent any memory errors.
> Anyway, I'm not arguing against using pkg-config (or *.cmake files) to
> detect -I, -L and -l options which need to be passed to the
> compiler/linker. With -D and other stuff things might get a bit
> complicated. I still think that #defining a SWORD_VERSION macro should
> instead be done in some installed header file, at least for platforms
> without a working pkg-config (or for devs who don't know what
> pkg-config is or how to use it).
> Blessings,
> Jaak
> PS: Just for your information, I attached to this email a ABI
> compliance checker report for compatibility between Sword 1.6.2 and
> 1.7.0RC2. The tool gave me some compile errors so its output might not
> be fully reliable, but the file might still be informative.
> PPS: For good reading on shared libraries, see
>    http://www.akkadia.org/drepper/dsohowto.pdf
>    http://www.akkadia.org/drepper/goodpractice.pdf
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> =Jtus
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