druntime C parts of binary releases not built with PIC

[dnadlinger]

On a fresh Ubuntu 16.10 image:

ubuntu@ubuntu:~$ echo 'void main() { import std.stdio; writeln("Hello World!"); }' > test.d
ubuntu@ubuntu:~$ ldc2-1.1.0-linux-x86_64/bin/ldc2 test.d
/usr/bin/ld: /home/ubuntu/ldc2-1.1.0-linux-x86_64/bin/../lib/libdruntime-ldc.a(errno.c.o): relocation R_X86_64_PC32 against symbol `__errno_location@@GLIBC_2.2.5' can not be used when making a shared object; recompile with -fPIC
/usr/bin/ld: final link failed: Bad value
collect2: error: ld returned 1 exit status
Error: /usr/bin/gcc failed with status: 1

In Ubuntu 16.10 (and newer), they patched the linker to make position-independent code the default even for executables (to enable ASLR, …). As a consequence, we chose to default to PIC on Linux as well. However, this applies only to the ldc2 output and not the C parts of the runtime – since we build on an old Ubuntu version, gcc still defaults to non-PIC code. As a result, libdruntime-ldc.a is incompatible with the implicit PIE default of the system linker.

We need to push out a 1.1.1 release with this issue fixed.

[kinke]

Ah, so that's the issue the guy in the forum had.

[dnadlinger]

It seems that way. Just found it on an EC2 instance.