Bug 298377 – simde: Building on RISC-V with ISA RVA23S64 fails with error: unknown type name 'fixed_vint8m1_t'

• Status: NEW
• Component: New Bugs

[Heinrich Schuchardt]

In an Ubuntu 25.10 virtual machine providing the RISC-V RVA23S64 ISA profile building origin/main as of commit 1dd72c65129700b74c1c2a275bfe16d2b2b9eeb1 fails with:

/<<PKGBUILDDIR>>/Source/WTF/wtf/simde/arm/neon.h:9198:5: error: unknown type name 'fixed_vint8m1_t'
 9198 | fixed_vint8m1_t sv64;
      | ^

The same issue was reported in
https://bugs.launchpad.net/ubuntu/+source/webkit2gtk/+bug/2121516

We are using gcc 15.2

Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/riscv64-linux-gnu/15/lto-wrapper
Target: riscv64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 15.2.0-1ubuntu1' --with-bugurl=file:///usr/share/doc/gcc-15/README.Bugs --enable-languages=c,ada,c++,go,d,fortran,objc,obj-c++,m2,rust,cobol,algol68 --prefix=/usr --with-gcc-major-version-only --program-suffix=-15 --program-prefix=riscv64-linux-gnu- --enable-shared --enable-linker-build-id --libexecdir=/usr/libexec --without-included-gettext --enable-threads=posix --libdir=/usr/lib --enable-nls --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new --enable-libstdcxx-backtrace --enable-gnu-unique-object --disable-libquadmath --disable-libquadmath-support --enable-plugin --enable-default-pie --with-system-zlib --enable-libphobos-checking=release --with-target-system-zlib=auto --enable-objc-gc=auto --enable-multiarch --disable-werror --disable-multilib --with-abi=lp64d --with-arch=rv64i_m_a_f_d_c_b_v_zic64b_zicbom_zicbop_zicboz_ziccamoa_ziccif_zicclsm_ziccrse_zicntr_zicond_zicsr_zifencei_zihintntl_zihintpause_zihpm_zimop_zmmul_za64rs_zaamo_zalrsc_zawrs_zfa_zfhmin_zca_zcb_zcd_zcmop_zba_zbb_zbs_zkt_zvbb_zve32f_zve32x_zve64d_zve64f_zve64x_zvfhmin_zvkb_zvkt_zvl128b_zvl32b_zvl64b_supm --enable-checking=release --build=riscv64-linux-gnu --host=riscv64-linux-gnu --target=riscv64-linux-gnu --with-build-config=bootstrap-lto-lean --enable-link-serialization=4
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 15.2.0 (Ubuntu 15.2.0-1ubuntu1)

Upstream simde-everywhere (https://github.com/simd-everywhere/simde.git) builds without issues.

[Radar WebKit Bug Importer]

<rdar://problem/160353854>