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riscv-collab / riscv-gnu-toolchain

GNU toolchain for RISC-V, including GCC
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Package gcc-riscv64-unknown-elf on Ubuntu packages is built without newlib #1502

Closed AthaSSiN closed 2 days ago

AthaSSiN commented 3 days ago

What I did:

sudo apt install gcc-riscv64-unknown-elf binutils-riscv64-unknown-elf 
riscv64-unknown-elf-gcc -v

What I got:

Using built-in specs.
COLLECT_GCC=riscv64-unknown-elf-gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/riscv64-unknown-elf/13.2.0/lto-wrapper
Target: riscv64-unknown-elf
Configured with: ../gcc-13.2.0/configure --build=x86_64-linux-gnu --prefix=/usr --includedir='/usr/lib/include' --mandir='/usr/lib/share/man' --infodir='/usr/lib/share/info' --sysconfdir=/etc --localstatedir=/var --disable-option-checking --disable-silent-rules --libdir='/usr/lib/lib/x86_64-linux-gnu' --libexecdir='/usr/lib/lib/x86_64-linux-gnu' --disable-maintainer-mode --disable-dependency-tracking --enable-languages=c,c++ --prefix=/usr/lib --infodir=/usr/share/doc/gcc-riscv64-unknown-elf/info --mandir=/usr/share/man --htmldir=/usr/share/doc/gcc-riscv64-unknown-elf/html --pdfdir=/usr/share/doc/gcc-riscv64-unknown-elf/pdf --bindir=/usr/bin --libexecdir=/usr/lib --libdir=/usr/lib --with-system-zlib --enable-multilib --disable-decimal-float --disable-libffi --disable-libgomp --disable-libmudflap --disable-libquadmath --disable-libssp --disable-libstdcxx-pch --disable-libstdc++-v3 --disable-nls --disable-shared --disable-threads --with-arch=rv64imafdc --enable-tls --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=riscv64-unknown-elf --with-gnu-as --with-gnu-ld --with-headers=no --without-newlib --with-pkgversion=13.2.0-11ubuntu1+12 --without-included-gettext SED=/bin/sed SHELL=/bin/sh BASH=/bin/bash CONFIG_SHELL=/bin/bash AR_FOR_TARGET=riscv64-unknown-elf-ar AS_FOR_TARGET=riscv64-unknown-elf-as LD_FOR_TARGET=riscv64-unknown-elf-ld NM_FOR_TARGET=riscv64-unknown-elf-nm OBJDUMP_FOR_TARGET=riscv64-unknown-elf-objdump RANLIB_FOR_TARGET=riscv64-unknown-elf-ranlib READELF_FOR_TARGET=riscv64-unknown-elf-readelf STRIP_FOR_TARGET=riscv64-unknown-elf-strip ASFLAGS= ASFLAGS_FOR_BUILD= CFLAGS='-g -O2 -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -ffile-prefix-map=/build/gcc-riscv64-unknown-elf-dBf63N/gcc-riscv64-unknown-elf-12=. -fstack-protector-strong -fstack-clash-protection -fcf-protection -fdebug-prefix-map=/build/gcc-riscv64-unknown-elf-dBf63N/gcc-riscv64-unknown-elf-12=/usr/src/gcc-riscv64-unknown-elf-12' 'CFLAGS_FOR_BUILD=-g -O2' CPPFLAGS='-Wdate-time -D_FORTIFY_SOURCE=3' CPPFLAGS_FOR_BUILD= CXXFLAGS='-g -O2 -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -ffile-prefix-map=/build/gcc-riscv64-unknown-elf-dBf63N/gcc-riscv64-unknown-elf-12=. -fstack-protector-strong -fstack-clash-protection -fcf-protection -fdebug-prefix-map=/build/gcc-riscv64-unknown-elf-dBf63N/gcc-riscv64-unknown-elf-12=/usr/src/gcc-riscv64-unknown-elf-12' 'CXXFLAGS_FOR_BUILD=-g -O2' DFLAGS=-frelease DFLAGS_FOR_BUILD=-frelease FCFLAGS='-g -O2 -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -ffile-prefix-map=/build/gcc-riscv64-unknown-elf-dBf63N/gcc-riscv64-unknown-elf-12=. -fstack-protector-strong -fstack-clash-protection -fcf-protection -fdebug-prefix-map=/build/gcc-riscv64-unknown-elf-dBf63N/gcc-riscv64-unknown-elf-12=/usr/src/gcc-riscv64-unknown-elf-12' 'FCFLAGS_FOR_BUILD=-g -O2' FFLAGS='-g -O2 -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -ffile-prefix-map=/build/gcc-riscv64-unknown-elf-dBf63N/gcc-riscv64-unknown-elf-12=. -fstack-protector-strong -fstack-clash-protection -fcf-protection -fdebug-prefix-map=/build/gcc-riscv64-unknown-elf-dBf63N/gcc-riscv64-unknown-elf-12=/usr/src/gcc-riscv64-unknown-elf-12' 'FFLAGS_FOR_BUILD=-g -O2' LDFLAGS='-Wl,-Bsymbolic-functions -Wl,-z,relro -Wl,-z,now' LDFLAGS_FOR_BUILD= OBJCFLAGS='-g -O2 -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -ffile-prefix-map=/build/gcc-riscv64-unknown-elf-dBf63N/gcc-riscv64-unknown-elf-12=. -fstack-protector-strong -fstack-clash-protection -fcf-protection -fdebug-prefix-map=/build/gcc-riscv64-unknown-elf-dBf63N/gcc-riscv64-unknown-elf-12=/usr/src/gcc-riscv64-unknown-elf-12' 'OBJCFLAGS_FOR_BUILD=-g -O2' OBJCXXFLAGS='-g -O2 -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -ffile-prefix-map=/build/gcc-riscv64-unknown-elf-dBf63N/gcc-riscv64-unknown-elf-12=. -fstack-protector-strong -fstack-clash-protection -fcf-protection -fdebug-prefix-map=/build/gcc-riscv64-unknown-elf-dBf63N/gcc-riscv64-unknown-elf-12=/usr/src/gcc-riscv64-unknown-elf-12' 'OBJCXXFLAGS_FOR_BUILD=-g -O2' INHIBIT_LIBC_CFLAGS=-DUSE_TM_CLONE_REGISTRY=0 'CFLAGS_FOR_TARGET=-Os -mcmodel=medany' 'CXXFLAGS_FOR_TARGET=-Os -mcmodel=medany'
Thread model: single
Supported LTO compression algorithms: zlib
gcc version 13.2.0 (13.2.0-11ubuntu1+12)

As can be seen, it has the --without-newlib flag.

As per the README, isn't this build supposed to use newlib?

If there are alternatives (riscv64 binaries that support newlib), it will be really helpful as I am unable to stepi into kernel space while debugging using this binary or the risc64-linux-gnu-gcc binary. I am trying to use them for the xv6-kernel.

This is the solution to my problem I am trying to follow.

I am using Ubuntu 24.04 LTS

TommyMurphyTM1234 commented 3 days ago

You probably need to contact whoever manages this package in the relevant Ubuntu software repository - e.g. to ask them how they build the toolchain and why they use --without-newlib. This has nothing to do with the riscv-gnu-toolchain repository per se.