https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110478
Bug ID: 110478
Summary: RISC-V multilib gcc zicsr in the -march causing
incorrect libgcc to be used
Product: gcc
Version: 13.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: driver
Assignee: unassigned at gcc dot gnu.org
Reporter: bmeng.cn at gmail dot com
Target Milestone: ---
Using the prebuilt toolchain from kernel.org to test this.
$ cd /tmp
$ wget
https://mirrors.edge.kernel.org/pub/tools/crosstool/files/bin/x86_64/13.1.0/x86_64-gcc-13.1.0-nolibc-riscv64-linux.tar.xz
$ tar xf x86_64-gcc-13.1.0-nolibc-riscv64-linux.tar.xz
$ cd /tmp/gcc-13.1.0-nolibc/riscv64-linux/bin
$ ./riscv64-linux-gcc -march=rv64gc -mabi=lp64 -print-libgcc-file-name
/tmp/gcc-13.1.0-nolibc/riscv64-linux/bin/../lib/gcc/riscv64-linux/13.1.0/lib64/lp64/libgcc.a
$ ./riscv64-linux-gcc -march=rv32gc -mabi=ilp32 -print-libgcc-file-name
/tmp/gcc-13.1.0-nolibc/riscv64-linux/bin/../lib/gcc/riscv64-linux/13.1.0/lib32/ilp32/libgcc.a
$ ./riscv64-linux-gcc -march=rv64gc_zicsr -mabi=lp64 -print-libgcc-file-name
/tmp/gcc-13.1.0-nolibc/riscv64-linux/bin/../lib/gcc/riscv64-linux/13.1.0/libgcc.a
$ ./riscv64-linux-gcc -march=rv32gc_zicsr -mabi=ilp32 -print-libgcc-file-name
/tmp/gcc-13.1.0-nolibc/riscv64-linux/bin/../lib/gcc/riscv64-linux/13.1.0/libgcc.a
As you can see from above, without "zicsr" in the "-march", the libgcc path
correctly reflects its multilib configuration, i.e.: 64-bit will link the
libgcc.a in the lib64 sub-directory.
But with "zicsr" in the "-march", the libgcc path is always the non-multilib
version.
The toolchain was configured by:
$ ./riscv64-linux-gcc -###
Using built-in specs.
COLLECT_GCC=./riscv64-linux-gcc
COLLECT_LTO_WRAPPER=/tmp/gcc-13.1.0-nolibc/riscv64-linux/bin/../libexec/gcc/riscv64-linux/13.1.0/lto-wrapper
Target: riscv64-linux
Configured with: /home/arnd/git/gcc/configure --host=x86_64-linux-gnu
--build=aarch64-linux --target=riscv64-linux --enable-targets=all
--prefix=/home/arnd/cross/x86_64/gcc-13.1.0-nolibc/riscv64-linux
--enable-languages=c --without-headers --disable-bootstrap --disable-nls
--disable-threads --disable-shared --disable-libmudflap --disable-libssp
--disable-libgomp --disable-decimal-float --disable-libquadmath
--disable-libatomic --disable-libcc1 --disable-libmpx --enable-checking=release
--with-static-standard-libraries
Thread model: single
Supported LTO compression algorithms: zlib zstd
gcc version 13.1.0 (GCC)
It seems this multilib bug was introduced when zicsr was introduced to RISC-V
GCC.
