[Scons-users] Code not rebuilt when switching between two VisualStudio versions

[Bill Deegan]

Steve,

Can you share an example command line with your coverage tool? is the
cl.exe still on the command line?

-Bill

On Thu, Mar 25, 2021 at 10:06 AM Steve Hill (Wireless) via Scons-users <
scons-users at scons.org> wrote:

> Hi Mats,
>
> Thanks for your reply.
>
> >> It should be - you should be able to see the compiler as a dependency
> if you run scons with --tree=prune option, and you can later dump the
> database to see stored signatures with the sconsign command.
>
> Obviously, I should have done this before posting! ... and it shows me the
> problem. We use a coverage tool that provides a replacement
> cl.exe/link.exe, which will then invoke the appropriate MSVC
> cl.exe/link.exe. This has the effect of obscuring the dependency on the
> real compiler - SCons only sees the coverage cl.exe as being the
> dependency. Could I use Depends() to indicate that the coverage cl.exe
> "depends on" the real MSVC cl.exe?
>
> Thanks again,
>
> Steve.
>
> -----Original Message-----
> From: Scons-users <scons-users-bounces at scons.org> On Behalf Of Mats
> Wichmann
> Sent: 25 March 2021 15:43
> To: scons-users at scons.org
> Subject: Re: [Scons-users] Code not rebuilt when switching between two
> VisualStudio versions
>
> On 3/25/21 1:54 AM, Steve Hill (Wireless) via Scons-users wrote:
> > Hi all,
> >
> > We are using SCons 3.1.2 and are evaluating moving from MSVS 2017 to
> > MSVS 2019. We have provided a mechanism to switch the setting of
> > MSVS_VERSION/MSVC_VERSION from 14.1 to 14.2 when the Environment is
> > created, and this works well when building clean or incrementally with
> > the same toolchain. However, if switching between toolchains, the
> > C/C++ files don't get rebuilt and, as soon as one file is changed and
> > rebuilt so that the linker is invoked, we get a linker failure. It is
> > almost like the compiler is not included as a dependency of the object
> file?
>
> It should be - you should be able to see the compiler as a dependency if
> you run scons with --tree=prune option, and you can later dump the database
> to see stored signatures with the sconsign command.
>
> > Can anyone give me a clue as to how to ensure that the files are
> > correctly rebuilt (ideally without having to change the places where
> > the files are added into SCons, as our codebase is quite large.)
>
> The thing to check would be if the toolchain is actually switching...
> there's been several iterations of fixing up selecting the right one when
> there are multiple chains installed, some of those may have come after
> 3.1.2.  Memory is hazy as to the timeline...
>
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