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D.gnu - gdc broken by ldc-phobos-devel on Fedora

reply mipri <mipri minimaltype.com> writes:
Howdy,

This was the case in Fedora 30, and is now the case in Fedora 31.
RPMs are available for gdc and for ldc2, but when both are
installed gdc can't compile anything as it tries to load a version
of phobos installed by ldc2 which has features gdc doesn't yet
support. For someone who's decided to just use gdc for a project,
they have the easy fix of just uninstalling ldc2, but I'd expect
that someone evaluating D as a language will be interested in
comparing the different compilers, so all the compilers will be
installed--and then only dmd and ldc will be functional.

As commands:

   dnf install gcc-gdc ldc
   echo 'void main() { import std.stdio; writeln("hello"); }' > 
hello.d
   gdc hello.d

This will fail due to ldc-phobos-devel's files in /usr/include/d:

/usr/include/d/core/internal/hash.d:426:16: error: basic type 
expected, not foreach
   426 |         static foreach (i; 0 .. T.sizeof / size_t.sizeof)
       |                ^
/usr/include/d/core/internal/hash.d:426:16: error: no identifier 
for declarator _error_
   426 |         static foreach (i; 0 .. T.sizeof / size_t.sizeof)
       |                ^
/usr/include/d/core/internal/traits.d:175:12: error: declaration 
expected, not 'foreach'
   175 |     static foreach (Ti; T)
       |            ^
/usr/include/d/core/internal/traits.d:175:26: error: no 
identifier for declarator T
   175 |     static foreach (Ti; T)
       |                          ^
/usr/include/d/core/internal/traits.d:175:26: error: declaration 
expected, not ')'
   175 |     static foreach (Ti; T)
       |                          ^
/usr/include/d/core/internal/traits.d:182:5: error: unrecognized 
declaration
   182 |     }
       |     ^

gdc installs its own files into path[1] but prefers 
/usr/include/d:

import path[0] = /usr/include/d
import path[1] = /usr/lib/gcc/x86_64-redhat-linux/9/include/d

and I haven't found a way, in gdc's manpage or in (the much less
examined) gcc documentation, to skip the first path. I'm also not
sure what a proper fix would be. Maybe the ldc rpm should be
updated to install phobos into a similarly ldc-specific directory.
Maybe a gdc update will happen soon and ldc's phobos files will be
acceptable to it.

Mainly I want to mention it here so that people can find it and 
not
just think that gdc is broken on Fedora, like I thought for a good
while.
Nov 20 2019
next sibling parent Iain Buclaw <ibuclaw gdcproject.org> writes:
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Nov 20 2019
prev sibling parent reply Matthias Klumpp <mak debian.org> writes:
On Wednesday, 20 November 2019 at 21:51:58 UTC, mipri wrote:

 Howdy,

 This was the case in Fedora 30, and is now the case in Fedora 
 31.
 RPMs are available for gdc and for ldc2, but when both are
 installed gdc can't compile anything as it tries to load a 
 version
 of phobos installed by ldc2 which has features gdc doesn't yet
 support. For someone who's decided to just use gdc for a 
 project,
 they have the easy fix of just uninstalling ldc2, but I'd expect
 that someone evaluating D as a language will be interested in
 comparing the different compilers, so all the compilers will be
 installed--and then only dmd and ldc will be functional.


That's why we explicitly set the LDC include path in Debian: 
https://salsa.debian.org/d-team/ldc/blob/master/debian/rules#L15
This is a bug in Fedora, you could file an issue with the package 
at Fedora and ask them to do the same as Debian for include paths.
(we do set the path explicitly as linked, and also apply this 
patch: 
https://salsa.debian.org/d-team/ldc/blob/master/debian/patches/02_ldc_include_path.diff

Cheers,
     Matthias
Nov 21 2019
parent BoraxMan <rotflol2 hotmail.com> writes:
On Thursday, 21 November 2019 at 23:25:34 UTC, Matthias Klumpp 
wrote:

 On Wednesday, 20 November 2019 at 21:51:58 UTC, mipri wrote:

 [...]


 That's why we explicitly set the LDC include path in Debian: 
 https://salsa.debian.org/d-team/ldc/blob/master/debian/rules#L15
 This is a bug in Fedora, you could file an issue with the 
 package at Fedora and ask them to do the same as Debian for 
 include paths.
 (we do set the path explicitly as linked, and also apply this 
 patch: 
 https://salsa.debian.org/d-team/ldc/blob/master/debian/patches/02_ldc_include_path.diff

 Cheers,
     Matthias


I filed a bug report with Fedora for this issue.
Dec 13 2019