unable to build glibc for target riscv64-linux-gnu

[andrewrk]

[nix-shell:~/dev/zig/build]$ ./zig build-exe --c-source hello.c -target riscv64-linux-gnu -lc
/home/andy/dev/zig/lib/libc/glibc/sysdeps/riscv/start.S:37:10: fatal error: 'entry.h' file not found
#include <entry.h>
         ^~~~~~~~~
1 error generated.

The following command failed:
/home/andy/dev/zig/build/zig cc -MD -MV -MF /home/andy/.local/share/zig/stage1/tmp/jy58t2gTUqIE-start.o.d -nostdinc -fno-spell-checking -isystem /home/andy/dev/zig/lib/include -target riscv64-unknown-linux-gnu -g -fno-omit-frame-pointer -D_DEBUG -fno-stack-protector -fPIC -o /home/andy/.local/share/zig/stage1/tmp/jy58t2gTUqIE-start.o -c /home/andy/dev/zig/lib/libc/glibc/sysdeps/riscv/start.S -I /home/andy/dev/zig/lib/libc/glibc/include -I /home/andy/dev/zig/lib/libc/glibc/sysdeps/unix/sysv/linux/riscv -I /home/andy/dev/zig/lib/libc/glibc/sysdeps/riscv/nptl -I /home/andy/dev/zig/lib/libc/glibc/sysdeps/unix/sysv/linux/generic -I /home/andy/dev/zig/lib/libc/glibc/sysdeps/unix/sysv/linux/include -I /home/andy/dev/zig/lib/libc/glibc/sysdeps/unix/sysv/linux -I /home/andy/dev/zig/lib/libc/glibc/sysdeps/nptl -I /home/andy/dev/zig/lib/libc/glibc/sysdeps/pthread -I /home/andy/dev/zig/lib/libc/glibc/sysdeps/unix/sysv -I /home/andy/dev/zig/lib/libc/glibc/sysdeps/unix/riscv -I /home/andy/dev/zig/lib/libc/glibc/sysdeps/unix -I /home/andy/dev/zig/lib/libc/glibc/sysdeps/riscv -I /home/andy/dev/zig/lib/libc/glibc/sysdeps/generic -I /home/andy/dev/zig/lib/libc/glibc -I /home/andy/dev/zig/lib/libc/include/riscv64-linux-gnu -I /home/andy/dev/zig/lib/libc/include/generic-glibc -I /home/andy/dev/zig/lib/libc/include/riscv64-linux-any -I /home/andy/dev/zig/lib/libc/include/any-linux-any -D_LIBC_REENTRANT -include /home/andy/dev/zig/lib/libc/glibc/include/libc-modules.h -DMODULE_NAME=libc -Wno-nonportable-include-path -include /home/andy/dev/zig/lib/libc/glibc/include/libc-symbols.h -DPIC -DSHARED -DTOP_NAMESPACE=glibc -DASSEMBLER -g -Wa,--noexecstack

[andrewrk]

Related: #4459

[daurnimator]

This now seems to fail with:

$ zig build-exe --c-source hello.c -target riscv64-linux-gnu -lc
In file included from hello.c:1:
In file included from /home/daurnimator/src/zig/lib/libc/include/generic-glibc/stdio.h:27:
In file included from /home/daurnimator/src/zig/lib/libc/include/generic-glibc/bits/libc-header-start.h:33:
In file included from /home/daurnimator/src/zig/lib/libc/include/generic-glibc/features.h:489:
/home/daurnimator/src/zig/lib/libc/include/riscv64-linux-gnu/gnu/stubs.h:11:11: fatal error: 'gnu/stubs-lp64d.h' file not found
# include <gnu/stubs-lp64d.h>
          ^~~~~~~~~~~~~~~~~~~
1 error generated.

The following command failed:
/home/daurnimator/src/zig/build/zig clang -c -MD -MV -MF zig-cache/tmp/uZEbEh5O-XWK-hello.o.d -nostdinc -fno-spell-checking -isystem /home/daurnimator/src/zig/lib/include -isystem /home/daurnimator/src/zig/lib/libc/include/riscv64-linux-gnu -isystem /home/daurnimator/src/zig/lib/libc/include/generic-glibc -isystem /home/daurnimator/src/zig/lib/libc/include/riscv64-linux-any -isystem /home/daurnimator/src/zig/lib/libc/include/any-linux-any -target riscv64-unknown-linux-gnu -Xclang -target-feature -Xclang +64bit,+a,+c,+d,-e,+f,+m,-relax,-reserve-x1,-reserve-x10,-reserve-x11,-reserve-x12,-reserve-x13,-reserve-x14,-reserve-x15,-reserve-x16,-reserve-x17,-reserve-x18,-reserve-x19,-reserve-x2,-reserve-x20,-reserve-x21,-reserve-x22,-reserve-x23,-reserve-x24,-reserve-x25,-reserve-x26,-reserve-x27,-reserve-x28,-reserve-x29,-reserve-x3,-reserve-x30,-reserve-x31,-reserve-x4,-reserve-x5,-reserve-x6,-reserve-x7,-reserve-x8,-reserve-x9,-rvc-hints -mno-relax -g -fno-omit-frame-pointer -fsanitize=undefined -fsanitize-trap=undefined -D_DEBUG -Og -fstack-protector-strong --param ssp-buffer-size=4 -fPIC -o zig-cache/tmp/uZEbEh5O-XWK-hello.o hello.c

[andrewrk]

The fix for this issue is likely just copying a few files over from glibc 2.31 into zig's source repo.