Crystal: unrecognized relocation (0x2a) in section `.text'

[girng]

Preface

I feel like this is an issue because it's happening on a default installation of Debian 8, 64-bit. If it's not, feel free to close this and I will PM Brian on the forums, thanks!

Crystal 0.32.1 [41bd18fbe] (2019-12-18)

Issue

After following the Debian installation instructions, and running a blank .cr file, (crystal muffin.cr), this error will occur:

root@test:~# crystal muffin.cr
/usr/bin/ld: /usr/bin/../lib/crystal/lib/libgc.a(alloc.o): unrecognized relocation (0x2a) in section `.text'
/usr/bin/ld: final link failed: Bad value
collect2: error: ld returned 1 exit status
Error: execution of command failed with code: 1: `cc "${@}" -o '/root/.cache/crystal/crystal-run-muffin.tmp'  -rdynamic  -lpcre -lm /usr/bin/../lib/crystal/lib/libgc.a -lpthread /usr/share/crystal/src/ext/libcrystal.a -levent -lrt -ldl -L/usr/bin/../lib/crystal/lib -L/usr/lib -L/usr/local/lib`

I found this post on SO.

ld -v:

GNU ld (GNU Binutils for Debian) 2.25

[RX14]

This is to do with an old ld binary in debian 8. Perhaps we should compile libgc.a with an even older debian or centos, since debian 8 is still supported until june 30th.

[bcardiff]

A related issue was raised in https://travis-ci.community/t/fails-to-link-against-libgc-a-in-crystal-0-31-0/5197/5 and solved by upgrading binutils but I think you might be in the latest available for jessie

Another related issue is #8323

From the travis issue, a fix might be to ship a gc built with -fno-plt, or use an older debian.

As a workaround is to build/link against a gc other than the one it was shipped. As long as you don't use preview_mt that should be doable with the official package.

[girng]

Aww, maybe I should just upgrade ;S. I think my server files will work on 9/10.
I don't want to bother you guys with older OS issues

[lugia-kun]

From the travis issue, a fix might be to ship a gc built with -fno-plt, or use an older debian.

I did not report to the board of Travis CI, but I have not succeeded with using gc with -fplt nor -fno-plt.

I have not tested (yet), but -fno-pie may affect, because they have given --enable-default-pie option while building GCC:

Singularity debian_10.sif:/home/lugia> gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/8/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Debian 8.3.0-6'
 --with-bugurl=file:///usr/share/doc/gcc-8/README.Bugs
 --enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++ --prefix=/usr
 --with-gcc-major-version-only  --program-suffix=-8 --program-prefix=x86_64-linux-gnu-
 --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext
 --enable-threads=posix --libdir=/usr/lib --enable-nls --enable-bootstrap --enable-clocale=gnu
 --enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new
 --enable-gnu-unique-object --disable-vtable-verify --enable-libmpx --enable-plugin
 --enable-default-pie --with-system-zlib --with-target-system-zlib --enable-objc-gc=auto
 --enable-multiarch --disable-werror --with-arch-32=i686 --with-abi=m64
 --with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic
 --enable-offload-targets=nvptx-none --without-cuda-driver --enable-checking=release 
 --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
gcc version 8.3.0 (Debian 8.3.0-6)

A simple test

Considering following simple C source, with Debian 10 (via Singularity container)

#include <stdio.h>

extern int foo(void);

int main(int argc, char **argv)
{
  printf("%p\n", foo);
  return 0;
}

1. Building with no options: uses R_X86_64_REX_GOTPCRELX relocation (bad)

Singularity debian_10.sif:/home/lugia> gcc -c tmp.c
Singularity debian_10.sif:/home/lugia> readelf -r tmp.o

Relocation section '.rela.text' at offset 0x238 contains 3 entries:
  Offset          Info           Type           Sym. Value    Sym. Name + Addend
000000000012  000b0000002a R_X86_64_REX_GOTP 0000000000000000 foo - 4
00000000001c  000500000002 R_X86_64_PC32     0000000000000000 .rodata - 4
000000000026  000c00000004 R_X86_64_PLT32    0000000000000000 printf - 4

Relocation section '.rela.eh_frame' at offset 0x280 contains 1 entry:
  Offset          Info           Type           Sym. Value    Sym. Name + Addend
000000000020  000200000002 R_X86_64_PC32     0000000000000000 .text + 0

1. Building with -fplt options: no effect.

Singularity debian_10.sif:/home/lugia> gcc -fplt -c tmp.c
Singularity debian_10.sif:/home/lugia> readelf -r tmp.o

Relocation section '.rela.text' at offset 0x238 contains 3 entries:
  Offset          Info           Type           Sym. Value    Sym. Name + Addend
000000000012  000b0000002a R_X86_64_REX_GOTP 0000000000000000 foo - 4
00000000001c  000500000002 R_X86_64_PC32     0000000000000000 .rodata - 4
000000000026  000c00000004 R_X86_64_PLT32    0000000000000000 printf - 4

Relocation section '.rela.eh_frame' at offset 0x280 contains 1 entry:
  Offset          Info           Type           Sym. Value    Sym. Name + Addend
000000000020  000200000002 R_X86_64_PC32     0000000000000000 .text + 0

1. Building with -fno-plt options: makes PLT32 (0x04) relocation to REX_GOTPCRELX (0x29) relocation, but REX_GOTPCRELX (0x2a), which is in the question, has not been changed (i.e. bad)

Singularity debian_10.sif:/home/lugia> gcc -fno-plt -c tmp.c
Singularity debian_10.sif:/home/lugia> readelf -r tmp.o

Relocation section '.rela.text' at offset 0x238 contains 3 entries:
  Offset          Info           Type           Sym. Value    Sym. Name + Addend
000000000012  000b0000002a R_X86_64_REX_GOTP 0000000000000000 foo - 4
00000000001c  000500000002 R_X86_64_PC32     0000000000000000 .rodata - 4
000000000027  000c00000029 R_X86_64_GOTPCREL 0000000000000000 printf - 4

Relocation section '.rela.eh_frame' at offset 0x280 contains 1 entry:
  Offset          Info           Type           Sym. Value    Sym. Name + Addend
000000000020  000200000002 R_X86_64_PC32     0000000000000000 .text + 0

1. Building with -fno-pie: avoids use of REX_GOTPCRELX (success)

Singularity debian_10.sif:/home/lugia> gcc -fno-pie -c tmp.c
Singularity debian_10.sif:/home/lugia> readelf -r tmp.o

Relocation section '.rela.text' at offset 0x200 contains 3 entries:
  Offset          Info           Type           Sym. Value    Sym. Name + Addend
000000000010  000a0000000a R_X86_64_32       0000000000000000 foo + 0
000000000015  00050000000a R_X86_64_32       0000000000000000 .rodata + 0
00000000001f  000b00000004 R_X86_64_PLT32    0000000000000000 printf - 4

Relocation section '.rela.eh_frame' at offset 0x248 contains 1 entry:
  Offset          Info           Type           Sym. Value    Sym. Name + Addend
000000000020  000200000002 R_X86_64_PC32     0000000000000000 .text + 0

1. clang (LLVM8) won't use REX_GOTPCRELX in default for this example.
   
   
   
   • But I'm not sure whether any object files built by Crystal compiler use the relocation.
   
   

Singularity debian_10.sif:/home/lugia> clang-8 -c tmp.c
Singularity debian_10.sif:/home/lugia> readelf -r tmp.o

Relocation section '.rela.text' at offset 0x1a0 contains 3 entries:
  Offset          Info           Type           Sym. Value    Sym. Name + Addend
000000000018  000300000001 R_X86_64_64       0000000000000000 .rodata.str1.1 + 0
000000000022  000400000001 R_X86_64_64       0000000000000000 foo + 0
00000000002d  000600000004 R_X86_64_PLT32    0000000000000000 printf - 4

Relocation section '.rela.eh_frame' at offset 0x1e8 contains 1 entry:
  Offset          Info           Type           Sym. Value    Sym. Name + Addend
000000000020  000200000002 R_X86_64_PC32     0000000000000000 .text + 0

[RX14]

We don't want to include -fno-pie, since that is a huge security risk and disables ASLR.

PIE executables can be built and used on debian 8, it's about downgrading the toolchain version when building.

[lugia-kun]

I just noticed that the distributed binaries are not reported as PIE (but as shared library, which can be ASLR enabled). (I'm using hardening-check version 2.6, which might generate different result to Debian's)

lugia@kanna:~> wget https://github.com/crystal-lang/crystal/releases/download/0.32.1/crystal-0.32.1-1-linux-x86_64.tar.gz
lugia@kanna:~> tar xf crystal-0.32.1-1-linux-x86_64.tar.gz
lugia@kanna:~> hardening-check crystal-0.32.1-1/lib/crystal/bin/crystal
crystal-0.32.1-1/lib/crystal/bin/crystal:
 Position Independent Executable: no, regular shared library (ignored)
 Stack protected: no, not found!
 Fortify Source functions: unknown, no protectable libc functions used
 Read-only relocations: yes
 Immediate binding: yes

Built binaries by Crystal compiler becomes PIE only if -pie is included to the options in CC (Here, --enable-default-pie has not been included while building GCC in openSUSE Tumbleweed, which I'm using).

lugia@kanna:~> cat test2.cr
raise ""
lugia@kanna:~> CC="gcc -pie" crystal-0.32.1-1/bin/crystal build test2.cr
lugia@kanna:~> file test2
test2: ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, BuildID[sha1]=1ff64018bda5e09482ffada008a6ace2cc3d3750, for GNU/Linux 3.2.0, with debug_info, not stripped
lugia@kanna:~> hardening-check test2
test2:
 Position Independent Executable: yes
 Stack protected: no, not found!
 Fortify Source functions: no, only unprotected functions found!
 Read-only relocations: yes
 Immediate binding: no, not found!

lugia@kanna:~> crystal-0.32.1-1/bin/crystal build test2.cr
lugia@kanna:~> file test2
test2: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, BuildID[sha1]=427f36772e024db52865123abc63cc7ee60e6544, for GNU/Linux 3.2.0, with debug_info, not stripped
lugia@kanna:~> hardening-check test2
test2:
 Position Independent Executable: no, normal executable!
 Stack protected: no, not found!
 Fortify Source functions: no, only unprotected functions found!
 Read-only relocations: yes
 Immediate binding: no, not found!



md5-5f632f3906e64e37d08f5c4886eb62b2

lugia@kanna:~/build/crystal-for-legacy-dist/distribution-scripts> make CRYSTAL_VERSION=0.32.1 PREVIOUS_CRYSTAL_RELEASE_LINUX64_TARGZ=https://github.com/crystal-lang/crystal/releases/download/0.32.1/crystal-0.32.1-1-linux-x86_64.tar.gz PREVIOUS_CRYSTAL_RELEASE_LINUX32_TARGZ=https://github.com/crystal-lang/crystal/releases/download/0.32.1/crystal-0.32.1-1-linux-i686.tar.gz
lugia@kanna:~/build/crystal-for-legacy-dist/distribution-scripts> cd ~/tmp
lugia@kanna:~/tmp> tar xf ~/build/crystal-for-legacy-dist/distribution-scripts/linux/build/crystal-0.32.1-1-linux-x86_64.tar.gz
lugia@kanna:~/tmp> CC="gcc -v -pie" crystal-0.32.1-1/bin/crystal build ../test2.cr
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib64/gcc/x86_64-suse-linux/9/lto-wrapper
OFFLOAD_TARGET_NAMES=hsa:nvptx-none
Target: x86_64-suse-linux
Configured with: ../configure --prefix=/usr --infodir=/usr/share/info --mandir=/usr/share/man --libdir=/usr/lib64 --libexecdir=/usr/lib64 --enable-languages=c,c++,objc,fortran,obj-c++,ada,go,d --enable-offload-targets=hsa,nvptx-none=/usr/nvptx-none, --without-cuda-driver --disable-werror --with-gxx-include-dir=/usr/include/c++/9 --enable-ssp --disable-libssp --disable-libvtv --disable-cet --disable-libcc1 --enable-plugin --with-bugurl=https://bugs.opensuse.org/ --with-pkgversion='SUSE Linux' --with-slibdir=/lib64 --with-system-zlib --enable-libstdcxx-allocator=new --disable-libstdcxx-pch --enable-libphobos --enable-version-specific-runtime-libs --with-gcc-major-version-only --enable-linker-build-id --enable-linux-futex --enable-gnu-indirect-function --program-suffix=-9 --without-system-libunwind --enable-multilib --with-arch-32=x86-64 --with-tune=generic --with-build-config=bootstrap-lto-lean --enable-link-mutex --build=x86_64-suse-linux --host=x86_64-suse-linux
Thread model: posix
gcc version 9.2.1 20191209 [gcc-9-branch revision 279114] (SUSE Linux)
COMPILER_PATH=/usr/lib64/gcc/x86_64-suse-linux/9/:/usr/lib64/gcc/x86_64-suse-linux/9/:/usr/lib64/gcc/x86_64-suse-linux/:/usr/lib64/gcc/x86_64-suse-linux/9/:/usr/lib64/gcc/x86_64-suse-linux/:/usr/lib64/gcc/x86_64-suse-linux/9/../../../../x86_64-suse-linux/bin/
LIBRARY_PATH=/usr/lib64/gcc/x86_64-suse-linux/9/:/usr/lib64/gcc/x86_64-suse-linux/9/../../../../lib64/:/lib/../lib64/:/usr/lib/../lib64/:/home/lugia/tmp/crystal-0.32.1-1/bin/../lib/crystal/lib/:/usr/lib64/gcc/x86_64-suse-linux/9/../../../../x86_64-suse-linux/lib/:/usr/lib64/gcc/x86_64-suse-linux/9/../../../:/lib/:/usr/lib/
COLLECT_GCC_OPTIONS='-v' '-pie' '-o' '/home/lugia/tmp/test2' '-rdynamic' '-L/home/lugia/tmp/crystal-0.32.1-1/bin/../lib/crystal/lib' '-L/usr/lib' '-L/usr/local/lib' '-mtune=generic' '-march=x86-64'
/usr/lib64/gcc/x86_64-suse-linux/9/collect2 -plugin /usr/lib64/gcc/x86_64-suse-linux/9/liblto_plugin.so -plugin-opt=/usr/lib64/gcc/x86_64-suse-linux/9/lto-wrapper -plugin-opt=-fresolution=/tmp/cceqEiHw.res -plugin-opt=-pass-through=-lgcc -plugin-opt=-pass-through=-lgcc_s -plugin-opt=-pass-through=-lc -plugin-opt=-pass-through=-lgcc -plugin-opt=-pass-through=-lgcc_s --build-id --eh-frame-hdr -m elf_x86_64 -export-dynamic -dynamic-linker /lib64/ld-linux-x86-64.so.2 -pie -o /home/lugia/tmp/test2 /usr/lib64/gcc/x86_64-suse-linux/9/../../../../lib64/Scrt1.o /usr/lib64/gcc/x86_64-suse-linux/9/../../../../lib64/crti.o /usr/lib64/gcc/x86_64-suse-linux/9/crtbeginS.o -L/home/lugia/tmp/crystal-0.32.1-1/bin/../lib/crystal/lib -L/usr/lib -L/usr/local/lib -L/usr/lib64/gcc/x86_64-suse-linux/9 -L/usr/lib64/gcc/x86_64-suse-linux/9/../../../../lib64 -L/lib/../lib64 -L/usr/lib/../lib64 -L/home/lugia/tmp/crystal-0.32.1-1/bin/../lib/crystal/lib 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D-ebug5858D-W-A-R-F-5858L-ineN-umbers5858S-equence.o A-rray40T-uple40S-5992430a1a7ef1627717adfb71332538.o P-ointer40T-uple4-13415771527eed75ea796bf4f3711255.o A-rray40U-I-nt841.o I-nt8.o S-taticA-rray40U-I-nt84432141.o D-ebug5858D-W-A-R-F-.o D-ebug5858D-W-A-R-F-5858L-ineN-umbers5858R-egister.o D-ebug5858D-W-A-R-F-5858L-ineN-umbers5858R-ow.o A-rray40D-ebug585-1d195a7f864d2d3790ebeadd84b7a4df.o P-ointer40D-ebug5-a50eac5c43900f6bca76f68ff8c8549d.o D-ebug5858D-W-A-R-F-5858L-N-E-.o D-ebug5858D-W-A-R-F-5858L-N-S-.o D-ebug5858D-W-A-R-F-5858S-trings.o A-rray40T-uple40U-997f9e533f193da5e605a2014e7947d9.o P-ointer40T-uple4-aa2454898accd295538d997a0365d41d.o D-ebug5858D-W-A-R-F-5858I-nfo.o D-ebug5858D-W-A-R-F-5858A-bbrev.o A-rray40D-ebug5858D-W-A-R-F-5858A-bbrev41.o P-ointer40D-ebug5858D-W-A-R-F-5858A-bbrev41.o A-rray40D-ebug585-b448de41619185732a02b2b0c778beb9.o P-ointer40D-ebug5-038cd8f166075bfacc819464bf65667a.o D-ebug5858D-W-A-R-F-5858A-bbrev5858A-ttribute.o A-rray40T-uple40D-2934b2835f929d23ac3adb7e5b7b0afe.o P-ointer40T-uple4-6ff119ef58145d1144587389190a4e25.o D-ebug5858D-W-A-R-F-5858F-O-R-M-.o U-nicode5858C-aseO-ptions.o U-nicode.o A-rray40T-uple40I-nt324432I-nt324432I-nt324141.o P-ointer40T-uple40I-nt324432I-nt324432I-nt324141.o H-ash40I-nt324432-c36c7b59ada9577e04b34b7156d26117.o P-ointer40H-ash58-df002967aa38240c2ffc8370480b96df.o H-ash5858E-ntry40-ea883736b6a497e8c0f2d29083b2162a.o A-rray40T-uple40I-nt324432I-nt324141.o P-ointer40T-uple40I-nt324432I-nt324141.o D-ebug5858D-W-A-R-F-5858T-A-G-.o D-ebug5858D-W-A-R-F-5858A-T-.o B-ool.o T-ypeC-astE-rror.o S-tring5858T-oU-64I-nfo.o A-tE-xitH-andlers.o A-rray40P-roc40I--412183da1a81233e2c20c488cb2e890d.o P-ointer40P-roc40-6252237c86bac28658266374d639ebc8.o I-O-5858F-ileD-escriptor.o S-taticA-rray40U-I-nt8443225641.o E-xception43.o T-ime5858L-ocatio-c92d7ae948ed8f4d38520c6d460d1469.o T-ime5858L-ocation5858I-nvalidL-ocationN-ameE-rror.o T-ime5858L-ocation5858I-nvalidT-Z-D-ataE-rror.o T-ime5858F-ormat5858E-rror.o T-ime5858F-loatingT-imeC-onversionE-rror.o B-ase645858E-rror.o P-ath5858E-rror.o F-ile5858B-adP-atternE-rror.o C-oncurrentE-xecutionE-xception.o C-oncurrent5858C-anceledE-rror.o C-hannel5858C-losedE-rror.o E-numerable5858E-mptyE-rror.o N-otI-mplementedE-rror.o O-verflowE-rror.o K-eyE-rror.o P-rocess.o C-rystal5858S-ystem5858F-ileI-nfo.o F-ile5858T-ype.o C-rystal5858S-ystem5858F-iber.o P-roc40F-iber4432-6eb246a0a45118d3c5507cc830b14a70.o S-ignal.o A-tomic5858F-lag.o L-ibC-5858S-igsetT-.o C-rystal5858S-ignal.o I-O-.o S-taticA-rray40I-nt324432241.o P-ointer40I-nt3241.o H-ash40S-ignal4432P-roc40S-ignal4432N-il4141.o P-ointer40H-ash58-0716a66562827a635360751c7a0bfb0b.o H-ash5858E-ntry40-37a9b13947932e73bc9389d755897071.o C-rystal5858S-ignalC-hildH-andler.o M-utex.o A-tomic40I-nt3241.o M-utex5858P-rotection.o I-ntrinsics.o H-ash40I-nt324432C-hannel40I-nt324141.o P-ointer40H-ash58-438550d1ae4863022fe79cbb17acca82.o H-ash5858E-ntry40I-nt324432C-hannel40I-nt324141.o C-hannel40I-nt3241.o C-hannel5858S-ender40I-nt3241.o P-ointer40C-hannel5858S-ender40I-nt324141.o C-rystal5858P-oin-c4f99d9688c0365d7ded28861381dd6c.o P-ointer40C-hannel5858R-eceiver40I-nt324141.o C-hannel5858R-eceiver40I-nt3241.o C-hannel5858S-electC-ontext40I-nt3241.o C-hannel5858S-electC-ontextS-haredS-tate.o A-tomic40C-hannel5858S-electS-tate41.o D-eque40I-nt3241.o C-hannel5858D-eliveryS-tate.o C-rystal5858P-oin-50c6dff1ac01adb5932ab2c073b74d07.o C-hannel5858S-electC-ontext40N-il41.o H-ash40I-nt324432I-nt3241.o P-ointer40H-ash5858E-ntry40I-nt324432I-nt324141.o H-ash5858E-ntry40I-nt324432I-nt3241.o H-ash40T-uple40U-I-nt644432S-ymbol414432B-ool41.o P-ointer40H-ash58-60a3eb55c544b99184778abc7dcee256.o H-ash40S-tring443-d0ef6a484ca24b5e9e1cd150630d96a3.o P-ointer40H-ash58-78e716075e5ec360a5549c235b8e9c11.o C-rystal5858O-nceS-tate.o A-rray40P-ointer40B-ool4141.o P-ointer40P-ointer40B-ool4141.o P-ointer40B-ool41.o P-roc40N-il41.o L-E-B-R-eader.o L-ibU-nwind5858A-ction.o L-ibU-nwind5858R-easonC-ode.o C-allS-tack5858R-epeatedF-rame.o C-rystal.o -lpcre -lm /home/lugia/tmp/crystal-0.32.1-1/bin/../lib/crystal/lib/libgc.a -lpthread /home/lugia/tmp/crystal-0.32.1-1/share/crystal/src/ext/libcrystal.a -levent -lrt -ldl -lgcc --push-state --as-needed -lgcc_s --pop-state -lc -lgcc --push-state --as-needed -lgcc_s --pop-state /usr/lib64/gcc/x86_64-suse-linux/9/crtendS.o /usr/lib64/gcc/x86_64-suse-linux/9/../../../../lib64/crtn.o
COLLECT_GCC_OPTIONS='-v' '-pie' '-o' '/home/lugia/tmp/test2' '-rdynamic' '-L/home/lugia/tmp/crystal-0.32.1-1/bin/../lib/crystal/lib' '-L/usr/lib' '-L/usr/local/lib' '-mtune=generic' '-march=x86-64'
lugia@kanna:~/tmp> hardening-check test2
test2:
Position Independent Executable: yes
Stack protected: no, not found!
Fortify Source functions: no, only unprotected functions found!
Read-only relocations: yes
Immediate binding: no, not found!
lugia@kanna:~/tmp> ldd test2
linux-vdso.so.1 (0x00007ffd77dc9000)
libpcre.so.1 => /usr/lib64/libpcre.so.1 (0x00007ff0b9166000)
libm.so.6 => /lib64/libm.so.6 (0x00007ff0b9021000)
libpthread.so.0 => /lib64/libpthread.so.0 (0x00007ff0b8fff000)
libevent-2.1.so.7 => /usr/lib64/libevent-2.1.so.7 (0x00007ff0b8fa5000)
librt.so.1 => /lib64/librt.so.1 (0x00007ff0b8f9a000)
libdl.so.2 => /lib64/libdl.so.2 (0x00007ff0b8f95000)
libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x00007ff0b8f79000)
libc.so.6 => /lib64/libc.so.6 (0x00007ff0b8db2000)
/lib64/ld-linux-x86-64.so.2 (0x00007ff0b9574000)
lugia@kanna:~/tmp> LANG=C readelf -r crystal-0.32.1-1/lib/crystal/lib/libgc.a | awk '/^Relocation|^ *Offset/ {}; /^[0-9a-f]/ { print $2,$3 }' | sort -k2 | uniq -f1
000900000001 R_X86_64_64
000300000009 R_X86_64_GOTPCREL
000200000002 R_X86_64_PC32
000300000004 R_X86_64_PLT32
001b00000013 R_X86_64_TLSGD

For distributed binary, the output of the last command will be following. So only relocation `0x2a` has been avoided.

lugia@kanna:~> LANG=C readelf -r crystal-0.32.1-1/lib/crystal/lib/libgc.a | awk '/^Relocation|^ *Offset/ {}; /^[0-9a-f]/ { print $2,$3 }' | sort -k2 | uniq -f1
000700000001 R_X86_64_64
001a00000009 R_X86_64_GOTPCREL
000200000002 R_X86_64_PC32
000800000004 R_X86_64_PLT32
00080000002a R_X86_64_REX_GOTP
000d00000013 R_X86_64_TLSGD
```