Build failure on RISC-V64 in Node.js v24.14.0

[SaitejaB31]

Hi,

I am encountering a compilation failure when building Node.js v24.14.0 natively on RISC-V64.
The build breaks in deps/v8/src/json/json-stringifier.cc. The FastJsonStringifier requests a 16-lane vector, but on RISC-V64 without the V-extension, Highway falls back to a strict 1-lane scalar implementation, causing template deduction to fail.

Error:-
../deps/v8/src/json/json-stringifier.cc:3356:33: error: no matching function for call to ‘Set(hwy::N_SCALAR::FixedTag<unsigned char, 16>&, int)’
3356 | const auto mask_0x20 = hw::Set(tag, 0x20);
| ~~~~~~~^~~~~~~~~~~
../deps/v8/third_party/highway/src/hwy/ops/scalar-inl.h:116:17: note: candidate: ‘template<class D, hwy::EnableIf<(D::kPrivateLanes == 1)>* , class T, class T2> hwy::N_SCALAR::Vec1 hwy::N_SCALAR::Set(D, T2)’
116 | HWY_API Vec1 Set(D /* tag /, const T2 t) {
| ^~~
../deps/v8/third_party/highway/src/hwy/ops/scalar-inl.h:116:17: note: template argument deduction/substitution failed:
../deps/v8/src/json/json-stringifier.cc:3357:33: error: no matching function for call to ‘Set(hwy::N_SCALAR::FixedTag<unsigned char, 16>&, int)’
3357 | const auto mask_0x22 = hw::Set(tag, 0x22);
| ~~~~~~~^~~~~~~~~~~
../deps/v8/third_party/highway/src/hwy/ops/scalar-inl.h:116:17: note: candidate: ‘template<class D, hwy::EnableIf<(D::kPrivateLanes == 1)> , class T, class T2> hwy::N_SCALAR::Vec1 hwy::N_SCALAR::Set(D, T2)’
116 | HWY_API Vec1 Set(D /* tag /, const T2 t) {
| ^~~
../deps/v8/third_party/highway/src/hwy/ops/scalar-inl.h:116:17: note: template argument deduction/substitution failed:
../deps/v8/src/json/json-stringifier.cc:3358:33: error: no matching function for call to ‘Set(hwy::N_SCALAR::FixedTag<unsigned char, 16>&, int)’
3358 | const auto mask_0x5c = hw::Set(tag, 0x5c);
| ~~~~~~~^~~~~~~~~~~
../deps/v8/third_party/highway/src/hwy/ops/scalar-inl.h:116:17: note: candidate: ‘template<class D, hwy::EnableIf<(D::kPrivateLanes == 1)> , class T, class T2> hwy::N_SCALAR::Vec1 hwy::N_SCALAR::Set(D, T2)’
116 | HWY_API Vec1 Set(D /* tag /, const T2 t) {
| ^~~
../deps/v8/third_party/highway/src/hwy/ops/scalar-inl.h:116:17: note: template argument deduction/substitution failed:
../deps/v8/src/json/json-stringifier.cc:3361:33: error: no matching function for call to ‘LoadU(hwy::N_SCALAR::FixedTag<unsigned char, 16>&, const unsigned char&)’
3361 | const auto input = hw::LoadU(tag, block);
| ~~~~~~~~~^~~~~~~~~~~~
../deps/v8/third_party/highway/src/hwy/ops/scalar-inl.h:1090:17: note: candidate: ‘template<class D, hwy::EnableIf<(D::kPrivateLanes == 1)>* , class T> hwy::N_SCALAR::Vec1 hwy::N_SCALAR::LoadU(D, const T*)’
1090 | HWY_API Vec1 LoadU(D d, const T* HWY_RESTRICT p) {
| ^~~~~
../deps/v8/third_party/highway/src/hwy/ops/scalar-inl.h:1090:17: note: template argument deduction/substitution failed:
make[1]: *** [tools/v8_gypfiles/v8_base_without_compiler.target.mk:1139: /home/user/node/out/Release/obj.target/v8_base_without_compiler/deps/v8/src/json/json-stringifier.o] Error 1
make[1]: *** Waiting for unfinished jobs....
rm c963181735d03de3bf99d3bc40db2e1e69f974c40ec0d109a7f24e14c00b737a.intermediate 68281cc6b5dfa4c0a2cf02421dc41eacecb50a2b11ce1ebe1f983bf22b2a6dbe.intermediate 6964f3c902231b8cdbd04ff5036cb56e7d1e1db774ad7dc13a467d17a2261f7f.intermediate
make: *** [Makefile:143: node] Error 2

Could smeone help me resolve this issue?

[sxa]

Hi @SaitejaB31,

Can you confirm which compiler you're using? Assuming you're using gcc (instead of clang) and it's not a bleeding edge GCC16 then that looks like the issue you can work around with export CXXFLAGS=-DHWY_BROKEN_EMU128=0 which has been working for me (although the error I was getting in json-stringifier isn't identical to yours).

See nodejs/build#4099 (comment)

[SaitejaB31]

Hi @sxa,
I’m currently using GCC 12. I have already applied the patches from this link (https://github.com/felixonmars/archriscv-packages/blob/master/nodejs-lts-krypton/hwy-broken-rvv.diff) and configured the build using ./configure --openssl-no-asm.
Despite those changes, I am still encountering the error.
I'll try your suggested CXXFLAGS workaround to see if it resolves the conflict.

[sxa]

I've built Node 24 natively with gcc-12 on a VisionFive2 board with that option and it works so hopefully it will be good for you too (I don't think Node 24 requires that other patch but it shouldn't do any harm!)

[damianremington274-blip]

Thanks for the update. I will try the build again using the export CXXFLAGS=-DHWY_BROKEN_EMU128=0 workaround with GCC 12 as you suggested. I'll let you know if this resolves the compilation error on my end.

…

On Thu, Apr 9, 2026, 11:54 AM Stewart X Addison ***@***.***> wrote: *sxa* left a comment (nodejs/node#62642) <#62642 (comment)> I've built Node 24 natively with gcc-12 on a VisionFive2 board with that option and it works so hopefully it will be good for you too (I don't think Node 24 requires that other patch but it shouldn't do any harm!) — Reply to this email directly, view it on GitHub <#62642 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/B7YAFGQ5BQXNKZXRDRHPECT4U7IVRAVCNFSM6AAAAACXR7EISKVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHM2DEMJVHE4TMMZQGM> . You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>

[kxxt]

Error:-
../deps/v8/src/json/json-stringifier.cc:3356:33: error: no matching function for call to ‘Set(hwy::N_SCALAR::FixedTag<unsigned char, 16>&, int)’
3356 | const auto mask_0x20 = hw::Set(tag, 0x20);
| ~~~~~~~^~~~~~~~~~~
../deps/v8/third_party/highway/src/hwy/ops/scalar-inl.h:116:17: note: candidate: ‘template<class D, hwy::EnableIf<(D::kPrivateLanes == 1)>* , class T, class T2> hwy::N_SCALAR::Vec1 hwy::N_SCALAR::Set(D, T2)’
116 | HWY_API Vec1 Set(D /* tag /, const T2 t) {

Please see nodejs/build#4099 (comment) for the possible solutions.

And please avoid asking the same issue simultaneously in multiple repositories without linking them together.