[Scons-users] Building versioned shared library fails when using MinGW

[Bill Deegan]

What's the proper naming for a versioned shared library under mingw?

Currently for your example it's trying to create :  libfoo.dylib.2.4

-Bill

On Sat, Nov 26, 2016 at 4:34 PM, Ray Speth <speth at darkmatter.mit.edu> wrote:

> If I name the target 'foo.dll', then the error becomes:
>
> scons: *** Multiple ways to build the same target were specified for:
> foo.dll
>
> If I change the name to 'foo.bar' then the error references the name
> 'foo.bar'.
>
> Adding either '--deub=presub' or '--tree=prune' does not provide any
> additional information. The output from running 'scons --debug-stacktrace'
> has been added to the previously-linked Gist.
>
> I would also note that debugging this does not necessarily require having
> MinGW installed. I am able to replicate this bug on an Ubuntu system as
> well, with the exception that in the "working" case you end up calling the
> system GCC with some flags that it doesn't like and compilation fails, as
> expected.
>
> Regards,
> Ray
>
> On 11/24/2016 11:05 PM, Bill Deegan wrote:
>
>> What happens when you change the target for SharedLibrary to 'foo.dll' ?
>>
>> On Tue, Nov 22, 2016 at 7:57 PM, Ray Speth <speth at darkmatter.mit.edu
>> <mailto:speth at darkmatter.mit.edu>> wrote:
>>
>>     Bill,
>>
>>     Adding the --tree=prune and --deub=presub options don't change the
>>     output. The value of CCCOM is '$CC -o $TARGET -c $CFLAGS $CCFLAGS
>>     $_CCCOMCOM $SOURCES'. According to env.subst, this works out to 'gcc
>>     -o -c'.
>>
>>     The output from adding the --debug=stacktrace option are posted at
>>     https://gist.github.com/speth/6f022116c3a1273952afe8167c6388ae
>>     <https://gist.github.com/speth/6f022116c3a1273952afe8167c6388ae>,
>>     along with the full output of 'print env.Dump()'.
>>
>>     Regards,
>>     Ray
>>
>>     On 11/20/2016 6:43 PM, Bill Deegan wrote:
>>
>>         Ray,
>>
>>         I don't have mingw installed on a system I have readily
>>         available today.
>>         Can you pastebin the output for the following:
>>
>>         scons --tree=prune
>>         scons --deub=presub
>>
>>         Add:
>>
>>         print env.Dump('CCCOM')
>>
>>         To you Sconstruct and run scons and copy that output as well.
>>
>>         Thanks,
>>
>>         Bill
>>
>>
>>
>>         On Sat, Nov 19, 2016 at 5:59 PM, Ray Speth
>>         <speth at darkmatter.mit.edu <mailto:speth at darkmatter.mit.edu>
>>         <mailto:speth at darkmatter.mit.edu
>>         <mailto:speth at darkmatter.mit.edu>>> wrote:
>>
>>
>>             Hi,
>>
>>             I have encountered an apparent bug when trying to build
>>             versioned
>>
>>         shared libraries with MinGW. A minimal SConstruct:
>>
>>
>>                 env = Environment(tools=['mingw'])
>>                 lib = env.SharedLibrary('foo', ['foo.cpp'],
>>             SHLIBVERSION='2.4')
>>                 env.AlwaysBuild(lib)
>>
>>             generates the following output:
>>
>>                 scons: Reading SConscript files ...
>>                 scons: *** A shared library should have exactly one
>>             target with the
>>             suffix: .dll
>>                 File "path\to\SConstruct", line 2, in <module>
>>
>>             I have tested this with SCons 2.4.1, 2.5.0, and 2.5.1, with
>>             the same
>>
>>         results.
>>
>>
>>             Regards,
>>             Ray
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