[Bug build/24577] New: 'make install-headers' fails for riscv64-unknown-linux-gnu: sysdeps/riscv/bits/wordsize.h:28:3: error: #error "rv32i-based targets are not supported"

["slyfox at inbox dot ru" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=24577

            Bug ID: 24577
           Summary: 'make install-headers' fails for
                    riscv64-unknown-linux-gnu:
                    sysdeps/riscv/bits/wordsize.h:28:3: error: #error
                    "rv32i-based targets are not supported"
           Product: glibc
           Version: 2.28
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: build
          Assignee: unassigned at sourceware dot org
          Reporter: slyfox at inbox dot ru
                CC: carlos at redhat dot com
  Target Milestone: ---

Gentoo bootstraps gcc cross-compilers in the following way:

1. build cross-binutils:
2. Install system headers (kernel headers and libc headers):
3. build minimal GCC without libc support (not able to link final
4. build complete libc (gcc will need crt.o files)
5. build full GCC (able to link final binaries for C and C++)

This bug is about build failure on [2.] step. Note: we don't have a
cross-compiler there.

More build failure details are at: https://bugs.gentoo.org/686248
The summary of it is failure to preprocess target files with host compiler:

x86_64-pc-linux-gnu-gcc -E -dM -MD -MP -MF
/tmp/portage/cross-riscv64-unknown-linux-gnu/glibc-2.28-r6/work/build-default-riscv64-unknown-linux-gnu-headers/bits/stdio_lim.dT
-MT
'/tmp/portage/cross-riscv64-unknown-linux-gnu/glibc-2.28-r6/work/build-default-riscv64-unknown-linux-gnu-headers/bits/stdio_lim.h
/tmp/portage/cross-riscv64-unknown-linux-gnu/glibc-2.28-r6/work/build-default-riscv64-unknown-linux-gnu-headers/bits/stdio_lim.d'
   \
       -I../include
-I/tmp/portage/cross-riscv64-unknown-linux-gnu/glibc-2.28-r6/work/build-default-riscv64-unknown-linux-gnu-headers/stdio-common

-I/tmp/portage/cross-riscv64-unknown-linux-gnu/glibc-2.28-r6/work/build-default-riscv64-unknown-linux-gnu-headers
 -I../sysdeps/unix/sysv/linux/riscv/rv64  -I../sysdeps/unix/sysv/linux/riscv 
-I../sysdeps/riscv/nptl  -I../sysdeps/unix/sysv/linux/generic 
-I../sysdeps/unix/sysv/linux/wordsize-64  -I../sysdeps/unix/sysv/linux/include
-I../sysdeps/unix/sysv/linux  -I../sysdeps/nptl  -I../sysdeps/pthread 
-I../sysdeps/gnu  -I../sysdeps/unix/inet  -I../sysdeps/unix/sysv 
-I../sysdeps/unix  -I../sysdeps/posix  -I../sysdeps/riscv/rv64/rvd 
-I../sysdeps/riscv/rv64/rvf  -I../sysdeps/riscv/rvf  -I../sysdeps/riscv/rvd 
-I../sysdeps/riscv/rv64  -I../sysdeps/riscv  -I../sysdeps/init_array 
-I../sysdeps/ieee754/ldbl-128  -I../sysdeps/ieee754/dbl-64 
-I../sysdeps/ieee754/flt-32  -I../sysdeps/wordsize-64  -I../sysdeps/ieee754 
-I../sysdeps/generic  -I.. -I../libio -I. -nostdinc -isystem
/usr/lib/gcc/x86_64-pc-linux-gnu/9.1.0/include -isystem
/usr/lib/gcc/x86_64-pc-linux-gnu/9.1.0/include-fixed -isystem
/usr/riscv64-unknown-linux-gnu/usr/include -xc - -o
/tmp/portage/cross-riscv64-unknown-linux-gnu/glibc-2.28-r6/work/build-default-riscv64-unknown-linux-gnu-headers/bits/stdio_lim.hT
In file included from ../posix/bits/posix1_lim.h:27,
                 from <stdin>:1:
../sysdeps/riscv/bits/wordsize.h:22:3: error: #error unsupported ABI
   22 | # error unsupported ABI
      |   ^~~~~
../sysdeps/riscv/bits/wordsize.h:28:3: error: #error "rv32i-based targets are
not supported"
   28 | # error "rv32i-based targets are not supported"
      |   ^~~~~

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