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digitalmars.D - Nothing builds on debian anymore.

reply deadalnix <deadalnix gmail.com> writes:
https://issues.dlang.org/show_bug.cgi?id=17236

Coming to you on ubuntu soon.
Mar 03 2017
next sibling parent "H. S. Teoh via Digitalmars-d" <digitalmars-d puremagic.com> writes:
On Fri, Mar 03, 2017 at 06:11:29PM +0000, deadalnix via Digitalmars-d wrote:

 https://issues.dlang.org/show_bug.cgi?id=17236
 
 Coming to you on ubuntu soon.


I just built dmd/druntime/phobos on Debian, and it works fine.  But then
again, I'm using my -fPIC workaround, which has been officially turned
down as a viable solution, so *shrug*.

For those who are interested, here's how to do it:

NOTE: this assumes you have a working bootstrap compiler installed in
/usr/src/d/install/ (I use 2.069 for this purpose but it should probably
work with other recent releases as well).

1) Create a g++ wrapper, say /usr/src/d/g++wrapper, with the following
contents:





	CXX_FLAGS=-no-pie

	if [ "$1" = "--version" ] ; then



		echo g++
		exit 0
	fi
	/usr/bin/g++ $CXX_FLAGS "$ "

2) Build dmd:

	export HOST_DMD=/usr/src/d/install/linux/bin64/dmd
	cd dmd/src
	make -f posix.mak clean
	make -f posix.mak \
		HOST_CXX=/usr/src/d/g++wrapper \
		HOST_DMD="/usr/src/d/install/linux/bin64/dmd
-conf=/usr/src/d/install/linux/bin64/dmd.conf" \
		MODEL=64 -j3

3) Build druntime/phobos with PIC=1:

	cd ../../druntime
	make -f posix.mak PIC=1 MODEL=64

	cd ../phobos
	make -f posix.mak PIC=1 MODEL=64

Yes, this makes druntime/phobos PIC, even for static linking, which may
introduce performance degradation.  But I'd rather suffer a slight
performance degradation than to be unable to use D at all.

Now, if there was a way to coax dmd to invoke g++ with -no-pie (besides
using the g++wrapper hack above), I'd be all ears, 'cos that would mean
we can build druntime/phobos without PIC=1, and simply have dmd always
emit non-PIC / non-PIE code.  However, the last time I tried this, I
still ran into problems with dmd-personality / g++-personality symbols
that for whatever reason are still incompatible with PIE.

Besides, even if somebody could figure out how to make this work, this
still defeats the purpose of PIE-by-default on Debian, so the REAL
solution is to implement emitting PIE (but not necessarily PIC) code in
dmd.

I hate to say it, knowing how busy Walter/Andrei and the rest of the dmd
devs are, but losing Debian/Ubuntu means losing a pretty significant
chunk of our userbase, so implementing PIE support in dmd should be a
pretty high priority.  But, sorry to say, I doubt anything will happen
on this front unless Walter was forced to use Debian for the next 6
months and has to personally face the frustration of being unable to
build dmd due to PIE-by-default.


T

-- 
Leather is waterproof.  Ever see a cow with an umbrella?
Mar 03 2017
prev sibling next sibling parent reply "H. S. Teoh via Digitalmars-d" <digitalmars-d puremagic.com> writes:
On Fri, Mar 03, 2017 at 10:32:34AM -0800, H. S. Teoh via Digitalmars-d wrote:

 On Fri, Mar 03, 2017 at 06:11:29PM +0000, deadalnix via Digitalmars-d wrote:

 https://issues.dlang.org/show_bug.cgi?id=17236
 
 Coming to you on ubuntu soon.


 
 I just built dmd/druntime/phobos on Debian, and it works fine.  But then
 again, I'm using my -fPIC workaround, which has been officially turned
 down as a viable solution, so *shrug*.


[...]

Actually, I just tested on a freshly-cloned copy of dmd/druntime/phobos,
it seems that building on Debian does work. Digging into the git log, it
appears that commit 78cd023 *should* have added -fPIC to the makefiles.

So how come it's still not working for you?  Are you using an older
bootstrap compiler? (If so, the g++wrapper trick I posted should solve
that problem -- you can skip the PIC=1 hacks for druntime/phobos as this
is apparently already merged into git master.)


T

-- 
Almost all proofs have bugs, but almost all theorems are true. -- Paul Pedersen
Mar 03 2017
parent reply deadalnix <deadalnix gmail.com> writes:
On Friday, 3 March 2017 at 18:47:53 UTC, H. S. Teoh wrote:

 Actually, I just tested on a freshly-cloned copy of 
 dmd/druntime/phobos, it seems that building on Debian does 
 work. Digging into the git log, it appears that commit 78cd023 
 *should* have added -fPIC to the makefiles.

 So how come it's still not working for you?  Are you using an 
 older bootstrap compiler? (If so, the g++wrapper trick I posted 
 should solve that problem -- you can skip the PIC=1 hacks for 
 druntime/phobos as this is apparently already merged into git 
 master.)


 T


I blasted everything away, reinstalled everything and now it 
builds....

Something must be broken with make clean then.
Mar 03 2017
parent Andrei Alexandrescu <SeeWebsiteForEmail erdani.org> writes:
On 3/3/17 6:27 PM, deadalnix wrote:

 On Friday, 3 March 2017 at 18:47:53 UTC, H. S. Teoh wrote:

 Actually, I just tested on a freshly-cloned copy of
 dmd/druntime/phobos, it seems that building on Debian does work.
 Digging into the git log, it appears that commit 78cd023 *should* have
 added -fPIC to the makefiles.

 So how come it's still not working for you?  Are you using an older
 bootstrap compiler? (If so, the g++wrapper trick I posted should solve
 that problem -- you can skip the PIC=1 hacks for druntime/phobos as
 this is apparently already merged into git master.)


 T


 I blasted everything away, reinstalled everything and now it builds....

 Something must be broken with make clean then.


Good to hear, could you please update (if reproducible) or close the 
issue. Thanks! -- Andrei
Mar 03 2017
prev sibling next sibling parent David Nadlinger <code klickverbot.at> writes:
On Friday, 3 March 2017 at 18:11:29 UTC, deadalnix wrote:

 https://issues.dlang.org/show_bug.cgi?id=17236

 Coming to you on ubuntu soon.


I'm pretty sure that would still work with LDC. So not exactly 
"nothing". ;)

  – David
Mar 03 2017
prev sibling parent Seb <seb wilzba.ch> writes:
On Friday, 3 March 2017 at 18:11:29 UTC, deadalnix wrote:

 https://issues.dlang.org/show_bug.cgi?id=17236

 Coming to you on ubuntu soon.


I started a new Docker instance and tried this:

```
docker run -i -t ubuntu:16.10 /bin/bash
apt-get update
apt-get install git curl gcc g++ unzip
git clone https://github.com/dlang/dmd
git clone https://github.com/dlang/druntime
git clone https://github.com/dlang/phobos
cd dmd
make -j8 -f posix.mak  AUTO_BOOTSTRAP=1
cd ../phobos
make -j8 -f posix.mak
```

Everything builds just fine!
As mentioned on a different ticket of yours, I believe it's still 
an issue with your setup and most likely an outdated DMD binary 
in `dmd`.
In case you think this isn't the case, please provide a proper 
bug report.

Moreover, as Martin has stated it before ranting here isn't a 
nice behavior, especially if it's _not_ our fault and "nothing" 
just refers to your build setup.
Mar 03 2017