[Scons-users] Problem with custom builder

[Michael Pock]

Hi Dirk,

On 29/07/13 22:13, Dirk Bächle wrote:

> Hi Michael,

> 

> On 29.07.2013 08:01, Michael Pock wrote:

>> [...] Hi Dirk,

>> 

>> thanks for your reply. I tried out your suggestions, but,

>> unfortunately, SCons still terminates with the error message

>> 

>> scons: *** Multiple ways to build the same target were specified

>> for: dir.list  (from ['dir.a'] and from ['dir.b'])

>> 

>> It seems there is no way to prevent SCons from stripping source

>> filename suffixes when computing target filenames.

> 

> I had a second look at your Builder and the following code works

> fine on my side:

> 

> env = Environment()

> 

> env["BUILDERS"]["List"] = Builder(action="ls ${SOURCE}

> >${TARGET}", suffix=".list", source_factory=Dir, 

> single_source=True)

> 

> env.List("dir.a.list", "dir.a") env.List("dir.b.list", "dir.b") 

> env.List("dir.c.list", "dir.c")

> 

> The basic problem in your case is, that the suffix of the source

> file changes. Usually, you'd have a single suffix, like ".dvi",

> that would get mapped to a suffix ".pdf" for the target. When

> simply specifying "env.List(['dir.a'])" SCons is confused and 

> assumes that the ".a" is the target suffix already. If specifying

> the full target name explicitly is too cumbersome for your taste,

> you might want to wrap your List() in a pseudo-Builder (see chap. 

> 20 in the UserGuide).

> 

> Best regards,

> 

> Dirk


a pseudo-builder that loops over the directory list seems to be the
way to go. Thanks!

Best regards,
Michael