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This seems to break the debuginfo for any applications that use libc functions, valgrind will spit the following error when doing a leak check on a program using strcmp:

valgrind:  Fatal error at startup: a function redirection
valgrind:  which is mandatory for this platform-tool combination
valgrind:  cannot be set up.  Details of the redirection are:
valgrind:  
valgrind:  A must-be-redirected function
valgrind:  whose name matches the pattern:      strcmp
valgrind:  in an object with soname matching:   ld-linux-x86-64.so.2
valgrind:  was not found whilst processing
valgrind:  symbols from the object with soname: ld-linux-x86-64.so.2
valgrind:  
valgrind:  Possible fixes: (1, short term): install glibc's debuginfo
valgrind:  package on this machine.  (2, longer term): ask the packagers
valgrind:  for your Linux distribution to please in future ship a non-
valgrind:  stripped ld.so (or whatever the dynamic linker .so is called)
valgrind:  that exports the above-named function using the standard
valgrind:  calling conventions for this platform.  The package you need
valgrind:  to install for fix (1) is called
valgrind:  
valgrind:    On Debian, Ubuntu:                 libc6-dbg
valgrind:    On SuSE, openSuSE, Fedora, RHEL:   glibc-debuginfo
valgrind:  
valgrind:  Note that if you are debugging a 32 bit process on a
valgrind:  64 bit system, you will need a corresponding 32 bit debuginfo
valgrind:  package (e.g. libc6-dbg:i386).
valgrind:  
valgrind:  Cannot continue -- exiting now.  Sorry.

Why does it fail to build?

I have a lot of UNSUPPORTED following two failed checks:

FAIL: misc/tst-preadvwritev2
FAIL: misc/tst-preadvwritev64v2

What might be the issue?

Having this error after update... ==> Cleaning up... [sudo] password for ramazotti: loading packages... resolving dependencies... looking for conflicting packages... :: glibc-eac-2.39-4 and glibc-2.39+r52+gf8e4623421-1 are in conflict. Remove glibc? [y/N] y error: failed to prepare transaction (could not satisfy dependencies) :: removing glibc breaks dependency 'glibc=2.39+r52+gf8e4623421' required by lib32-glibc -> error installing: [/home/ramazotti/.cache/yay/glibc-eac/glibc-eac-2.39-4-x86_64.pkg.tar.zst] - exit status 1

I'm stupid, I wont delete this but post the solution. Just yay -S lib32-glibc-eac

It should work now.

I am trying to build this (with yay first, but also chroot) and I get this failure

<command-line>: error: "_FORTIFY_SOURCE" redefined [-Werror]
<command-line>: note: this is the location of the previous definition
cc1: all warnings being treated as errors
make[2]: *** [../o-iterator.mk:9: /build/glibc-eac/src/glibc-build/stdlib/testmb.o] Error 1
make[2]: Leaving directory '/build/glibc-eac/src/glibc/stdlib'
make[1]: *** [Makefile:484: stdlib/tests] Error 2
make[1]: Leaving directory '/build/glibc-eac/src/glibc'
make: *** [Makefile:9: check] Error 2
==> ERROR: A failure occurred in check().

Try building in a clean chroot.

If that doesn't work, something may be wrong with the patch.

With ld I get: configure: error: --enable-multi-arch support requires assembler and linker support, with lld I also get

ld.lld: warning: unknown -z value: nomark-plt
ld.lld: error: version script assignment of 'GLIBC_2.4' to symbol '__stack_chk_guard' failed: symbol not defined
ld.lld: error: version script assignment of 'GLIBC_PRIVATE' to symbol '__nptl_set_robust_list_avail' failed: symbol not defined
ld.lld: error: version script assignment of 'GLIBC_PRIVATE' to symbol '__pointer_chk_guard' failed: symbol not defined
ld.lld: error: version script assignment of 'GLIBC_PRIVATE' to symbol '_dl_make_stack_executable' failed: symbol not defined
ld.lld: error: version script assignment of 'GLIBC_PRIVATE' to symbol '_dl_starting_up' failed: symbol not defined

So, which linker should I use to make this pkg?

mold: warning: unknown command line option: -z nomark-plt

@konradmoesch Don't use mold.

I get strange errors:

make[2]: Entering directory '/home/user/.cache/yay/glibc-eac/src/glibc/elf'
gcc -Wl,-O1,--sort-common,--as-needed,-z,relro,-z,now -fuse-ld=mold  -nostdlib -nostartfiles -shared -o /home/user/.cache/yay/glibc-eac/src/glibc-build/elf/ld.so.new         \
      -Wl,-z,relro -Wl,--hash-style=both -Wl,-z,nomark-plt -Wl,-z,defs -Wl,-z,now   \
      -Wl,-z,pack-relative-relocs \
      /home/user/.cache/yay/glibc-eac/src/glibc-build/elf/librtld.os -Wl,--version-script=/home/user/.cache/yay/glibc-eac/src/glibc-build/ld.map           \
      -Wl,-soname=ld-linux-x86-64.so.2
mold: warning: unknown command line option: -z nomark-plt
mold: warning: /home/user/.cache/yay/glibc-eac/src/glibc-build/ld.map: cannot assign version `GLIBC_2.4` to symbol `__stack_chk_guard`: symbol not found
mold: warning: /home/user/.cache/yay/glibc-eac/src/glibc-build/ld.map: cannot assign version `GLIBC_PRIVATE` to symbol `__nptl_set_robust_list_avail`: symbol not found
mold: warning: /home/user/.cache/yay/glibc-eac/src/glibc-build/ld.map: cannot assign version `GLIBC_PRIVATE` to symbol `__pointer_chk_guard`: symbol not found
mold: warning: /home/user/.cache/yay/glibc-eac/src/glibc-build/ld.map: cannot assign version `GLIBC_PRIVATE` to symbol `_dl_make_stack_executable`: symbol not found
mold: warning: /home/user/.cache/yay/glibc-eac/src/glibc-build/ld.map: cannot assign version `GLIBC_PRIVATE` to symbol `_dl_starting_up`: symbol not found

I did use --mflags "--nocheck", no effect