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Configure error when building glibc for RISC V


Hello,
Am trying to build the library for RISCV.
With following sources,
Have taken glibc-2.27.tar.xz & glibc-2.29.tar.xz
Linux headers linux-4.15.1

RISCV toolchain is built from instructions in
https://github.com/riscv/riscv-gnu-toolchain,(make linux).

But facing an Error, I can't able to sort it out, please help me out.

Following is the command,log and error:

$ ~/Downloads/glibc-2.27/Build$ ../configure \
> CC="riscv64-unknown-linux-gnu-gcc " \
> CXX="riscv64-unknown-linux-gnu-g++ " \
> CFLAGS=" -mcmodel=medlow -g -O2 " \
> CXXFLAGS=" -mcmodel=medlow -g -O2 " \
> ASFLAGS=" -mcmodel=medlow " \
> --host=riscv64-unknown-linux-gnu \
> --prefix=/home/ghalib/ws/Build-ETC/RGT-Linux-with-makefile/Exe-ETC-linux-elf/riscv64-linux-elf \
> --disable-werror \
> --enable-shared \
> --enable-obsolete-rpc \
> --with-headers=/home/ghalib/ws/Build-ETC/RGT-Linux-with-makefile/linux-headers/include \
> --disable-multilib \
> --libdir=/home/ghalib/ws/Build-ETC/RGT-Linux-with-makefile/Exe-ETC-linux-elf/sysroot/usr/lib libc_cv_slibdir=/home/ghalib/ws/Build-ETC/RGT-Linux-with-makefile/Exe-ETC-linux-elf/lib libc_cv_rtlddir=/home/ghalib/ws/Build-ETC/RGT-Linux-with-makefile/Exe-ETC-linux-elf/lib
checking build system type... x86_64-pc-linux-gnu
checking host system type... riscv64-unknown-linux-gnu
checking for riscv64-unknown-linux-gnu-gcc... riscv64-unknown-linux-gnu-gcc
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether riscv64-unknown-linux-gnu-gcc  accepts -g... yes
checking for gcc... gcc
checking for riscv64-unknown-linux-gnu-readelf...
riscv64-unknown-linux-gnu-readelf
checking whether we are using the GNU C++ compiler... yes
checking whether riscv64-unknown-linux-gnu-g++  accepts -g... yes
checking whether riscv64-unknown-linux-gnu-g++  can link programs... yes
checking for sysdeps preconfigure fragments... aarch64 alpha arm hppa
i386 m68k microblaze mips nios2 powerpc riscv s390 sh sparc tile
x86_64
checking for use of fpu sysdeps directories... yes
checking for -fstack-protector... yes
checking for -fstack-protector-strong... yes
checking for -fstack-protector-all... yes
checking for assembler and linker STT_GNU_IFUNC support... no
checking for gcc attribute ifunc support... no
checking if compiler warns about alias for function with incompatible
types... yes
configure: WARNING: gcc emits a warning for alias between functions of
incompatible types
configure: WARNING: Multi-arch is disabled.
checking sysdep dirs... sysdeps/unix/sysv/linux/riscv/rv64
sysdeps/unix/sysv/linux/riscv sysdeps/riscv/nptl
sysdeps/unix/sysv/linux/generic sysdeps/unix/sysv/linux/wordsize-64
sysdeps/unix/sysv/linux sysdeps/nptl sysdeps/pthread sysdeps/gnu
sysdeps/unix/inet sysdeps/unix/sysv sysdeps/unix sysdeps/posix
sysdeps/riscv/rv64/rvd sysdeps/riscv/rv64/rvf sysdeps/riscv/rvf
sysdeps/riscv/rvd sysdeps/riscv/rv64 sysdeps/riscv sysdeps/init_array
sysdeps/ieee754/ldbl-128 sysdeps/ieee754/dbl-64 sysdeps/ieee754/flt-32
sysdeps/wordsize-64 sysdeps/ieee754 sysdeps/generic
checking for a BSD-compatible install... /usr/bin/install -c
checking whether ln -s works... yes
checking whether
/home/ghalib/ws/Build-RGT/riscv-gnu-toolchain/Exe/Exe-RGT-Linux/bin/../lib/gcc/riscv64-unknown-linux-gnu/8.2.0/../../../../riscv64-unknown-linux-gnu/bin/as
is GNU as... yes
checking whether
/home/ghalib/ws/Build-RGT/riscv-gnu-toolchain/Exe/Exe-RGT-Linux/bin/../lib/gcc/riscv64-unknown-linux-gnu/8.2.0/../../../../riscv64-unknown-linux-gnu/bin/ld
is GNU ld... yes
checking for /home/ghalib/ws/Build-RGT/riscv-gnu-toolchain/Exe/Exe-RGT-Linux/bin/../lib/gcc/riscv64-unknown-linux-gnu/8.2.0/../../../../riscv64-unknown-linux-gnu/bin/as...
/home/ghalib/ws/Build-RGT/riscv-gnu-toolchain/Exe/Exe-RGT-Linux/bin/../lib/gcc/riscv64-unknown-linux-gnu/8.2.0/../../../../riscv64-unknown-linux-gnu/bin/as
checking version of
/home/ghalib/ws/Build-RGT/riscv-gnu-toolchain/Exe/Exe-RGT-Linux/bin/../lib/gcc/riscv64-unknown-linux-gnu/8.2.0/../../../../riscv64-unknown-linux-gnu/bin/as...
2.31.1, ok
checking for /home/ghalib/ws/Build-RGT/riscv-gnu-toolchain/Exe/Exe-RGT-Linux/bin/../lib/gcc/riscv64-unknown-linux-gnu/8.2.0/../../../../riscv64-unknown-linux-gnu/bin/ld...
/home/ghalib/ws/Build-RGT/riscv-gnu-toolchain/Exe/Exe-RGT-Linux/bin/../lib/gcc/riscv64-unknown-linux-gnu/8.2.0/../../../../riscv64-unknown-linux-gnu/bin/ld
checking version of
/home/ghalib/ws/Build-RGT/riscv-gnu-toolchain/Exe/Exe-RGT-Linux/bin/../lib/gcc/riscv64-unknown-linux-gnu/8.2.0/../../../../riscv64-unknown-linux-gnu/bin/ld...
2.31.1, ok
checking for gnumake... no
checking for gmake... no
checking for make... make
checking version of make... 4.1, ok
checking for gnumsgfmt... no
checking for gmsgfmt... no
checking for msgfmt... msgfmt
checking version of msgfmt... 0.19.7, ok
checking for makeinfo... makeinfo
checking version of makeinfo... 6.1, ok
checking for sed... sed
checking version of sed... 4.2.2, ok
checking for gawk... gawk
checking version of gawk... 4.1.3, ok
checking for bison... bison
checking version of bison... 3.0.4, ok
checking if riscv64-unknown-linux-gnu-gcc  is sufficient to build libc... yes
checking for riscv64-unknown-linux-gnu-nm... riscv64-unknown-linux-gnu-nm
checking for python3... python3
checking LD_LIBRARY_PATH variable... ok
checking for bash... /bin/bash
checking for perl... /usr/bin/perl
checking for install-info... /usr/bin/install-info
checking for .set assembler directive... yes
checking linker support for protected data symbol... yes
checking linker support for INSERT in linker script... yes
checking for broken __attribute__((alias()))... no
checking whether to put _rtld_local into .sdata section... yes
checking whether to use .ctors/.dtors header and trailer... no
checking for libunwind-support in compiler... no
checking whether --noexecstack is desirable for .S files... yes
checking for -z combreloc... yes
checking for linker that supports -z execstack... yes
checking for linker that supports --no-dynamic-linker... yes
checking for -static-pie... yes
checking for -fpie... yes
checking for --hash-style option... yes
checking for sufficient default -shared layout... no
checking for GLOB_DAT reloc... no
checking linker output format... elf64-littleriscv
checking for -fno-toplevel-reorder -fno-section-anchors... yes
checking for -mtls-dialect=gnu2... no
checking whether cc puts quotes around section names... no
checking for __builtin_memset... no
checking for redirection of built-in functions... yes
checking for compiler option to disable generation of FMA
instructions... -ffp-contract=off
checking if riscv64-unknown-linux-gnu-gcc  accepts
-fno-tree-loop-distribute-patterns with __attribute__
((__optimize__))... yes
checking for libgd... no
checking for is_selinux_enabled in -lselinux... no
checking for _FORTIFY_SOURCE predefine... no
checking whether the linker provides working __ehdr_start... yes
checking for __builtin_trap with no external dependencies... yes
checking whether the C++ compiler supports thread_local... yes
running configure fragment for sysdeps/unix/sysv/linux/riscv
checking for grep that handles long lines and -e... /bin/grep
checking for egrep... /bin/grep -E
running configure fragment for sysdeps/unix/sysv/linux
checking installed Linux kernel header files... 3.2.0 or later
checking for kernel header at least 4.15.0... too old!
configure: error: *** The available kernel headers are older than the requested
*** compatible kernel version

Could you please help us fix the configure error? The same issue is
seen with glibc 2.29

Thanks in Advance.


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