Re: Conditional Patch line

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On Mon, 2022-09-05 at 15:00 -0500, Maxwell G via devel wrote:
> On Monday, September 5, 2022 Richard W.M. Jones wrote:
> > I have a downstream patch[0] which -- I don't really understand why
> > --
> > breaks riscv64 builds but is necessary for primary Fedora arches. 
> > Is
> > it correct to do:
> > 
> >   %ifnarch riscv64
> >   Patch123: downstream.patch
> >   %endif
> > 
> > given that the package uses %autosetup and therefore doesn't have
> > explicit %patch lines.
> > 
> > I think this means that if I build the SRPM on riscv64 then the
> > downstream patch wouldn't be included, meaning that SRPM would then
> > fail to build on other arches.  In this particular case that
> > doesn't
> > matter, but it feels wrong.  Is there a recommended way to do this
> > (apart from fixing the patch)?
> 
> Yes, conditionalizing Source or Patch lines is a bad idea. This exact
> case is 
> explicitly forbidden by the guidelines[1]. There is also a guidelines
> PR to 
> forbid any type of Source/Patch conditionaliztion[2].

because src.rpm will be different if build in one specific arch and
src.rpm should have the same results built in any arch 

> [1]: https://docs.fedoraproject.org/en-US/packaging-guidelines/
> #_no_arch_specific_sources_or_patches
> 
> [2]: https://pagure.io/packaging-committee/pull-request/1163
> 
> If you don't want to add %patchX for every Patch, you can use regular
> `%setup 
> -q` together with %autopatch, which allows more granular control than
> `%autosetup`.
> 
> From /usr/lib/rpm/macros:
> 
> ```
> # Apply patches using %autosetup configured SCM.
> # Typically used with no arguments to apply all patches in the order
> # introduced in the spec, but alternatively can be used to apply
> indvidual
> # patches in arbitrary order by passing them as arguments.
> # -v            Verbose
> # -p<N>         Prefix strip (ie patch -p argument)
> # -m<min>       Apply patches with number >= min only (if no
> arguments)
> # -M<max>       Apply patches with number <= max only (if no
> arguments)
> %autopatch(vp:m:M:) %{lua:
> ```

maybe this works: 

%autosetup -M122 -m124  

%ifnarch riscv64
%patch123 -p1 
%endif

-- 
Sérgio M. B.
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