Description of problem:
Link Time Optimization was enabled in Fedora 33 Rawhide and
it causes lot of linker warnings via ghc(-8.8.4) for unregisterised
s390x:

+ CFLAGS='-O2 -flto=auto -ffat-lto-objects -fexceptions -g -grecord-gcc-switches -pipe -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -march=zEC12 -mtune=z13 -fasynchronous-unwind-tables -fstack-clash-protection'
+ export CFLAGS
+ export 'LDFLAGS=-Wl,-z,relro -Wl,--as-needed  '
+ LDFLAGS='-Wl,-z,relro -Wl,--as-needed  '
+ '[' -f Setup.hs -o -f Setup.lhs ']'
+ '[' -x Setup ']'
+ ghc --make -package Cabal -no-user-package-db -dynamic Setup
[1 of 1] Compiling Main             ( Setup.hs, Setup.o )
Linking Setup ...
+ LANG=C.utf8
+ ./Setup --version
Cabal library version 3.0.1.0
+ '[' -x Setup ']'
+ LANG=C.utf8
++ echo ' -O2' -flto=auto -ffat-lto-objects -fexceptions -g -grecord-gcc-switches -pipe -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -march=zEC12 -mtune=z13 -fasynchronous-unwind-tables -fstack-clash-protection
++ sed -e 's/ / -optc/g'
++ echo ' -Wl,-z,relro' -Wl,--as-needed
++ sed -e 's/ / -optl/g'
+ ./Setup configure --prefix=/usr --libdir=/usr/lib64 --docdir=/usr/share/licenses/ghc-cryptonite '--libsubdir=$compiler/$pkgid' '--datasubdir=$pkgid' '--libexecsubdir=$pkgid' --ghc --dynlibdir=/usr/lib64 --global '--ghc-options= -optc-O2 -optc-flto=auto -optc-ffat-lto-objects -optc-fexceptions -optc-g -optc-grecord-gcc-switches -optc-pipe -optc-Wp,-D_FORTIFY_SOURCE=2 -optc-Wp,-D_GLIBCXX_ASSERTIONS -optc-specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -optc-fstack-protector-strong -optc-specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -optc-m64 -optc-march=zEC12 -optc-mtune=z13 -optc-fasynchronous-unwind-tables -optc-fstack-clash-protection  -optl-Wl,-z,relro -optl-Wl,--as-needed' -p --enable-shared --htmldir=/usr/share/doc/ghc/html/libraries/cryptonite-0.26 --global
Configuring cryptonite-0.26...
+ '[' -x Setup ']'
+ LANG=C.utf8
+ ./Setup build
Preprocessing library for cryptonite-0.26..
Building library for cryptonite-0.26..
:
:
[131 of 131] Compiling Crypto.Tutorial  ( Crypto/Tutorial.hs, dist/build/Crypto/Tutorial.o )
[  1 of 131] Compiling Crypto.Cipher.DES.Primitive ( Crypto/Cipher/DES/Primitive.hs, dist/build/Crypto/Cipher/DES/Primitive.p_o )
/usr/bin/ld.gold: warning: incremental linking of LTO and non-LTO objects; using -flinker-output=nolto-rel which will bypass whole program optimization
/tmp/ghc794663_0/ghc_19.c:11:19: error:
     warning: type of ‘cryptonitezm0zi26zmIKFu0XykBrR53imeIPM2Uw_CryptoziCipherziDESziPrimitive_CAFs_cc’ does not match original declaration [-Wlto-type-mismatch]
       11 | extern CostCentre cryptonitezm0zi26zmIKFu0XykBrR53imeIPM2Uw_CryptoziCipherziDESziPrimitive_CAFs_cc[];
          |                   ^
   |
11 | extern CostCentre cryptonitezm0zi26zmIKFu0XykBrR53imeIPM2Uw_CryptoziCipherziDESziPrimitive_CAFs_cc[];
   |                   ^
/tmp/ghc794663_0/ghc_18.hc:44:9: error:
     note: type ‘StgWord’ should match type ‘struct CostCentre’
       44 | StgWord cryptonitezm0zi26zmIKFu0XykBrR53imeIPM2Uw_CryptoziCipherziDESziPrimitive_CAFs_cc[]__attribute__((aligned(8)))= {
          |         ^
   |
44 | StgWord cryptonitezm0zi26zmIKFu0XykBrR53imeIPM2Uw_CryptoziCipherziDESziPrimitive_CAFs_cc[]__attribute__((aligned(8)))= {
   |         ^
/tmp/ghc794663_0/ghc_18.hc:44:9: error:
     note: ‘cryptonitezm0zi26zmIKFu0XykBrR53imeIPM2Uw_CryptoziCipherziDESziPrimitive_CAFs_cc’ was previously declared here
   |
44 | StgWord cryptonitezm0zi26zmIKFu0XykBrR53imeIPM2Uw_CryptoziCipherziDESziPrimitive_CAFs_cc[]__attribute__((aligned(8)))= {
   |         ^
/tmp/ghc794663_0/ghc_18.hc:44:9: error:
     note: code may be misoptimized unless ‘-fno-strict-aliasing’ is used
   |
44 | StgWord cryptonitezm0zi26zmIKFu0XykBrR53imeIPM2Uw_CryptoziCipherziDESziPrimitive_CAFs_cc[]__attribute__((aligned(8)))= {
   |         ^
/tmp/ghc794663_0/ghc_19.c:12:24: error:
     warning: type of ‘cryptonitezm0zi26zmIKFu0XykBrR53imeIPM2Uw_CryptoziCipherziDESziPrimitive_CAFs_cc_ccs’ does not match original declaration [-Wlto-type-mismatch]
       12 | extern CostCentreStack cryptonitezm0zi26zmIKFu0XykBrR53imeIPM2Uw_CryptoziCipherziDESziPrimitive_CAFs_cc_ccs[];
          |                        ^
   |
12 | extern CostCentreStack cryptonitezm0zi26zmIKFu0XykBrR53imeIPM2Uw_CryptoziCipherziDESziPrimitive_CAFs_cc_ccs[];
   |                        ^
/tmp/ghc794663_0/ghc_18.hc:50:9: error:
     note: type ‘StgWord’ should match type ‘struct CostCentreStack’
       50 | StgWord cryptonitezm0zi26zmIKFu0XykBrR53imeIPM2Uw_CryptoziCipherziDESziPrimitive_CAFs_cc_ccs[]__attribute__((aligned(8)))= {
          |         ^
:
:
/usr/include/bits/string_fortified.h:59:1: error:
     error: inlining failed in call to ‘always_inline’ ‘memset’: function body can be overwritten at link time
       59 | __NTH (memset (void *__dest, int __ch, size_t __len))
          | ^
   |
59 | __NTH (memset (void *__dest, int __ch, size_t __len))
   | ^
/usr/include/bits/string_fortified.h:71:10: error:
     note: called from here
       71 |   return __builtin___memset_chk (__dest, __ch, __len, __bos0 (__dest));
          |          ^
   |
71 |   return __builtin___memset_chk (__dest, __ch, __len, __bos0 (__dest));
   |          ^
lto-wrapper: fatal error: /usr/bin/gcc returned 1 exit status
compilation terminated.
/usr/bin/ld.gold: fatal error: lto-wrapper failed
collect2: error: ld returned 1 exit status
`gcc' failed in phase `Linker'. (Exit code: 1)
error: Bad exit status from /var/tmp/rpm-tmp.eeilOC (%build)

Version-Release number of selected component (if applicable):
ghc-compiler-8.8.4-107.fc33.s390x
gcc-10.2.1-1.fc33.s390x
annobin-9.27-1.fc33.s390x
binutils-2.35-10.fc33.s390x

How reproducible:
100%

Steps to Reproduce:
1. build Haskell package for F33 on s390x

Actual results:
Additionally this caused ghc-cryptonite-0.26-3.fc33
and ghc-haskell-src-exts-1.23.1-3.fc33 to fail:

https://koji.fedoraproject.org/koji/taskinfo?taskID=48408236
https://koji.fedoraproject.org/koji/taskinfo?taskID=48322376

Expected results:
No problems

Additional info:
For now I will disable lto for s390x in ghc-rpm-macros.
When we move to ghc-8.10 we can switch s390x from gcc to the llvm
backend I hope then this problem should go away.