[CMake] CHECK_TYPE_SIZE works incorrectly with LDFLAGS="-Wl, --gc-sections"

[Arfrever Frehtes Taifersar Arahesis]

2008-08-06 21:05:50 Brad King napisał(a):
> Arfrever Frehtes Taifersar Arahesis wrote:
> > 2008-08-06 14:06:47 Bill Hoffman napisał(a):
> >> Arfrever Frehtes Taifersar Arahesis wrote:
> >>
> >>>> Can you do a find in your build tree and find CMakeError.log?
> >>> `find -name CMakeError.log` doesn't return anything.
> >>>
> >> Can you do this:
> >>
> >> cmake --debug-trycompile
> >>
> >> Then tar up and zip the whole thing and email it to me off the list.
> > 
> > It doesn't contain any private data, so I'm attaching it here.
> 
> CMake checks the type size by compiling a source file that encodes a
> string literal with the size of the type using the preprocessor.  See
> "Modules/CheckTypeSizeC.c.in" for the actual code.  Then the string
> literal is parsed out of the compiled file.  This avoids needing to run
> the program so the test works for cross compiling.
> 
> The trick is to convince the compiler to put the string in the final
> binary.  Getting this to happen on all compilers has required a few
> iterations.  Basically we have to make sure the program return value
> depends on the data.  It looks like we still need a better method to
> prevent the string from being removed by --gc-sections.  Try editing
> CheckTypeSizeC.c.in in your CMake installation, and replace the line
> 
>   return (&info_sizeof[0] != &info_sizeof[0]);
> 
> with
> 
>   return info_sizeof[0];
> 
> Then try building your project again.

It seems to work correctly.
Please include this change in the next version of CMake.

-- 
Arfrever Frehtes Taifersar Arahesis
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