[Issue 16794] Official .deb packages must compile libphobos2.a with -fPIC

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=16794

--- Comment #7 from hsteoh at quickfur.ath.cx ---
As for building libphobos.a with -fPIC, it's definitely possible, as I
described. At least, I managed to get it to work on my system.  I'm not sure
what is causing problems on your system that makes this impossible.

To recap, what I did to make it work is:

(1) Bootstrap dmd from an older non-PIE dmd installation:
    a) create a wrapper script for gcc/g++ (say, g++wrapper) that invokes it
with -no-pie.
    b) run make in the dmd subdir with HOST_CXX set to this wrapper, and
HOST_DMD set to your bootstrapping compiler. Make sure the bootstrapping
compiler's dmd.conf (preferably dedicated for bootstrapping) that has the right
paths to its corresponding version of druntime/phobos (which, presumably, are
from a non-PIE release).
    c) if you're having trouble bootstrapping dmd in spite of this, you may
want to check if gcc-specific flags like -Wnarrowing are being passed to gcc
when compiling dmd modules. If not, you may need to add a hack to g++wrapper
that echoes "g++" when the command-line contains "-version". This is a hack to
workaround posix.mak bogonity that tries to parse the output of `cc -version`
for identifying signs of gcc, but fails horribly with certain versions of
Debian's gcc distribution.

(2) (Re)build druntime/phobos with the new compiler, with PIC=1 passed to the
makefile to force libphobos.a to be built with -fPIC.

(3) Edit dmd.conf (of the bootstrapped compiler) and add -fPIC to the default
flags.

(4) (optionally) install dmd/libphobos in your system directories.

The new compiler should now be able to successfully compile and link PIE
executables that are statically linked to libphobos.a. Note that libphobos.a
built this way will be PIC, and may not be linkable to non-PIE executables
anymore.

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