Tup having problems reading symbols for PCH

[Casey Rodarmor]

Hi all,

I have a project where turning on the "-g" to clang causes the build to fail.

The first rule of the tupfile (attached) builds a pch from the "common.h" header file. When I uncomment "#CXXFLAGS += -g", I get a bunch of errors like the following:

* 2) cc view.program.c++

fatal error: cannot open file '/Users/rodarmor/pkg/rmr/src/.tup/mnt/@tupjob-1831/Users/rodarmor/pkg/rmr/src/common.h': Operation not permitted

1 error generated.

 *** tup errors ***

 *** Command ID=1631 failed with return value 1

tup error: Expected to write to file 'view.program.o' from cmd 1631 but didn't

 *** Additionally, command 1631 failed to process input dependencies. These should probably be fixed before addressing the command failure.

I think that "-g" is making clang all of a sudden look for symbols in common.h, which it can't open. Is that what's actually happening, and any ideas on how to fix it?

Thanks!

Best,
Casey

[Mike Shal]

Hi Casey,

I can't seem to reproduce this particular behavior (maybe it is specific to the version of clang? I have 3.4.)  However, usually when the .tup/mnt paths are getting stuck in the process, the workaround is to use the ^c flag in your rule. This runs the process in a chroot, so it doesn't see the .tup/mnt path. There are longer-term plans to make this not necessary, but that should work around it for now.

-Mike

[Casey Rodarmor]

Hi Mike,

Thanks! The ^c flag seems to have fixed it, although it adds a couple of seconds to build time. Is that to be expected?

Casey

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