GCC should still build with GCC 4.8.3 or newer [1] using C++03 by default. But a recent change in RISC-V port introduced a C++11 feature "std::log2" [2].
Use log2 from the C header, without the namespace [3]. [1] https://gcc.gnu.org/install/prerequisites.html [2] https://gcc.gnu.org/git/?p=gcc.git;a=patch;h=7caa1ae5e451e780fbc4746a54e3f19d4f4304dc [3] https://stackoverflow.com/questions/26733413/error-log2-is-not-a-member-of-std Fixes: https://gitlab.com/buildroot.org/toolchains-builder/-/jobs/4202276589 gcc/ChangeLog: * config/riscv/genrvv-type-indexer.cc: Use log2 from the C header, without the namespace. Signed-off-by: Romain Naour <romain.na...@gmail.com> --- gcc/config/riscv/genrvv-type-indexer.cc | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/gcc/config/riscv/genrvv-type-indexer.cc b/gcc/config/riscv/genrvv-type-indexer.cc index e677b55290c..eebe382d1c3 100644 --- a/gcc/config/riscv/genrvv-type-indexer.cc +++ b/gcc/config/riscv/genrvv-type-indexer.cc @@ -115,9 +115,9 @@ same_ratio_eew_type (unsigned sew, int lmul_log2, unsigned eew, bool unsigned_p, if (sew == eew) elmul_log2 = lmul_log2; else if (sew > eew) - elmul_log2 = lmul_log2 - std::log2 (sew / eew); + elmul_log2 = lmul_log2 - log2 (sew / eew); else /* sew < eew */ - elmul_log2 = lmul_log2 + std::log2 (eew / sew); + elmul_log2 = lmul_log2 + log2 (eew / sew); if (float_p) return floattype (eew, elmul_log2); -- 2.34.3
