When you create a branch, if you have already compiled object files, you
can keep them in your folder. You don't have to do a clean build on
creation of the branch. Then you can make your changes, do incremental
builds, and solve the problem/merge your code into the master.
The problem lies in switching between branches that already exist, which
might force a clean build...
As a side note, I'm really enjoying Go's ridiculously fast build times.
On Sun, Oct 20, 2013 at 3:59 AM, Blake McBride <blake1...@gmail.com> wrote:
> Not sure what you mean about designed well, but in order to switch
> branches without having to do a full rebuild would involve:
> 1. switching branches would have to auto-delete compiled modules (object
> files) for source files that aren't contained in the new branch in order to
> avoid link time collisions. Or, your build process would have to detect
> left over object files from a branch switch and delete them at build time.
> 2. from one branch to another there may be an include file (when using
> C/C++) that has a difference possibly necessitating a full rebuild.
> 3. git would have to restore files using the current date and time (as
> opposed to their original date/time) in order for the build system to force
> a recompile on those modules (I checked - git does do this!)
> I am sure there are many other possible system-specific issues as well,
> i.e. many situations where switching branches would subtly necessitate a
> full rebuild. They would present themselves as very hard-to-find bugs
> that would disappear when a full rebuild occurred.
> I can't imagine how any SCMS could solve problems like these. (Although,
> I ask the question in case there is a solution that eludes me.) Without a
> solution to problems like these, given a very large system, many of the
> cool features of a SCMS are not of much use.
> I bring all this up not to be difficult. I read about many cool SCMS
> features, but I can't see how they could be useful in a very large
> environment that I use all the time. I am wondering if there is a solution
> I am unaware of. Thinking about it, I suppose there are some design
> decisions that could be employed that are driven by nothing more than an
> attempt to resolve SCM branch issues, but there is no way I am aware of to
> totally fix the fundamental problems.
> Blake McBride
> On Saturday, October 19, 2013 5:52:00 PM UTC-5, Gergely Polonkai wrote:
>> according to your description, your project seems to be something like
>> the Linux kernel, and Git handles that just fine. Depending on your build
>> environment, Git branches may help you a lot, as, if it is designed well,
>> can prevent full rebuilds.
>> On 19 Oct 2013 23:40, "Blake McBride" <blak...@gmail.com> wrote:
>>> I have a large application that takes about two hours to build.
>>> Sometime I have to do partial-project commits in order to communicate
>>> development from one area to another (I can explain further but it is
>>> irrelevant to the question). I'd prefer (if I was using git rather than
>>> svn) to create a branch to commit the partial work, debug, and finally
>>> merge to the master when it is all done. This way each commit on
>>> masterwould be stable (contain no partial commits). My problem is this.
>>> the size of the project, I can't checkout different versions without
>>> causing a two hour build. I am sure this must be a common problem.
>>> Stated another way - when you have a very large project, branching
>>> becomes a significant problem because of build times. Are there common
>>> solutions to this sort of problem?
>>> Blake McBride
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