DC=... can't find alternative D compilers

[WebDrake]

I'm trying to build dub from git-HEAD source on an Ubuntu 13.10 system that has all 3 D compilers installed. Just running build.sh works fine (DMD is auto-detected and the library compiles), but running it with the DC=... option fails:

$ ./build.sh DC=ldmd2
Generating version file...
Running dmd...
Error: cannot read file DC=ldmd2.d

$ ./build.sh DC=/opt/ldc/bin/ldmd2
Generating version file...
Running dmd...
Error: cannot read file DC=/opt/ldc/bin/ldmd2.d

$ ./build.sh DC=gdmd
Generating version file...
Running dmd...
Error: cannot read file DC=gdmd.d

[s-ludwig]

You need to turn that around: DC=ldmd2 ./build.sh
It's not a command line option, but rather an environment variable. Have you seen anything documented about "DC" by any chance? This needs to be added to the README and on the code.dlang.org documentation.

[WebDrake]

No, have seen nothing documented. I'm used to such things being defined after the command (e.g. ./configure CFLAGS=... etc.), so assumed this would work similarly.

Thanks for the quick response!

[WebDrake]

Compiling using ldmd2 or gdmd falls over, however:

$ DC=ldmd2 ./build.sh 
Generating version file...
Running ldmd2...
bin/dub.o:(.rodata._D123TypeInfo_S3std8typecons86__T10RefCountedTS3std4file15DirIteratorImplVE3std8typecons24RefCountedAutoInitialize0Z10RefCounted6__initZ[_D123TypeInfo_S3std8typecons86__T10RefCountedTS3std4file15DirIteratorImplVE3std8typecons24RefCountedAutoInitialize0Z10RefCounted6__initZ]+0x60): undefined reference to `_D3std8typecons86__T10RefCountedTS3std4file15DirIteratorImplVE3std8typecons24RefCountedAutoInitialize0Z10RefCounted10__postblitMFZv'
collect2: error: ld returned 1 exit status
Error: /usr/bin/gcc failed with status: 1

$ DC=gdmd ./build.sh 
Generating version file...
Running gdmd...
/opt/gdc/include/d/4.8.2/x86_64-unknown-linux-gnu/core/time.di:224: error: this cannot be interpreted at compile time, because it has no available source code
/opt/gdc/include/d/4.8.2/std/net/curl.d:195: note: called from here: dur(2L)

[s-ludwig]

Hm, both seem to be bugs of those compilers, although it's hard to judge for the LDC case. Can you file bug reports against those? Hopefully the maintainers will be willing to reduce the test case if required.

[mihails-strasuns]

gdc failure is issue on their side - they install only .di files for druntime by default.
http://forum.dlang.org/post/evgopfyvfbpcopwrnqll@forum.dlang.org

[WebDrake]

The GDC devs are aware of the issue, it was flagged in a different context by another user.

[WebDrake]

The LDC error is also a bug, now fixed: ldc-developers/ldc#454. So I think we can close this.