release-0.7: switch C++ toolchain to gcc-14

Dockerfile.ci

@@ -1,13 +1,56 @@
-FROM ubuntu:24.04
+FROM debian:trixie-slim
 
-# Base + g++ + git for perf_tests
-RUN DEBIAN_FRONTEND=noninteractive && apt-get update && apt-get install -y gpg wget gcc g++ libunwind-dev jq bash nodejs npm bzip2 \
-    git autoconf make iproute2 jq curl ca-certificates libtool pkg-config cmake lcov && \
-    echo "deb http://apt.llvm.org/jammy/ llvm-toolchain-jammy-19 main" | tee /etc/apt/sources.list.d/archive_uri-http_apt_llvm_org_jammy_-jammy.list && \
-    wget -qO - https://apt.llvm.org/llvm-snapshot.gpg.key | apt-key add - && \
-    apt-get update && apt-get install -y clang-format-19 clang-tidy-19 && \
-    ln -s /usr/lib/llvm-19/bin/clang-tidy /usr/bin/clang-tidy && \
-    ln -s /usr/lib/llvm-19/bin/clang-format /usr/bin/clang-format
+# Align with Deckhouse module (debian-trixie) and libunwind+lzma static link expectations.
+# LLVM 21 from apt.llvm.org (trixie toolchain).
+# binutils-gold: needed only on linux/arm64 because every currently released Go
+# (1.25.x with x<=9 and 1.26.x with x<=2) unconditionally forces `-fuse-ld=gold`
+# for cgo dynamic/PIE links and aborts with "ARM64 external linker must be gold"
+# otherwise (see https://github.com/golang/go/issues/15696 and
+# https://github.com/golang/go/issues/22040). The underlying GNU bfd bug was
+# fixed in binutils 2.36 (we ship 2.44), but Go itself only learned to detect
+# that and fall back to bfd in CL 740480; the backports landed in
+# release-branch.go1.{25,26} on 2026-04-17, *after* the cut of go1.26.2
+# (2026-04-15), so the fix will first ship in Go 1.25.10 / Go 1.26.3.
+# Once GO_VERSION below is bumped to >=1.25.10 or >=1.26.3, this package can
+# be dropped (see https://github.com/golang/go/issues/78405).
+RUN set -eux; \
+    apt-get update; \
+    apt-get install -y --no-install-recommends \
+        ca-certificates \
+        curl \
+        wget \
+        gnupg \
+        gcc-14 \
+        g++-14 \
+        binutils-gold \
+        libunwind-dev \
+        liblzma-dev \
+        libstdc++-14-dev \
+        jq \
+        bash \
+        nodejs \
+        npm \
+        bzip2 \
+        git \
+        autoconf \
+        make \
+        iproute2 \
+        libtool \
+        pkg-config \
+        cmake \
+        lcov; \
+    wget -qO /tmp/llvm-snapshot.gpg.key https://apt.llvm.org/llvm-snapshot.gpg.key; \
+    gpg --dearmor -o /usr/share/keyrings/apt-llvm-org.gpg /tmp/llvm-snapshot.gpg.key; \
+    rm -f /tmp/llvm-snapshot.gpg.key; \
+    echo "deb [signed-by=/usr/share/keyrings/apt-llvm-org.gpg] http://apt.llvm.org/trixie/ llvm-toolchain-trixie-21 main" > /etc/apt/sources.list.d/llvm.list; \
+    apt-get update; \
+    apt-get install -y --no-install-recommends clang-format-21 clang-tidy-21; \
+    ln -sf /usr/lib/llvm-21/bin/clang-tidy /usr/bin/clang-tidy; \
+    ln -sf /usr/lib/llvm-21/bin/clang-format /usr/bin/clang-format; \
+    update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-14 100; \
+    update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-14 100; \
+    update-alternatives --install /usr/bin/gcov gcov /usr/bin/gcov-14 100; \
+    rm -rf /var/lib/apt/lists/*
 
 # Bazel
 ARG BAZEL_VERSION=7.4.1
@@ -16,7 +59,11 @@ RUN wget -qO "/usr/local/bin/bazel" https://github.com/bazelbuild/bazel/releases
     chmod +x "/usr/local/bin/bazel"
 
 # Go + go-tools (GOPATH under /opt so FIRST_GOPATH/bin/goyacc is found when /root is volume-mounted)
-ARG GO_VERSION=1.25.9
+# TODO: when bumping GO_VERSION to >=1.25.10 or >=1.26.3, drop the
+# `binutils-gold` package above — those Go releases no longer require gold on
+# linux/arm64 when GNU ld is 2.36+. See the comment near `binutils-gold` and
+# https://github.com/golang/go/issues/22040 (issue #78405 for the 1.25 backport).
+ARG GO_VERSION=1.26.2
 ARG GO_ARCH
 RUN cd /tmp && curl -LOs https://go.dev/dl/go${GO_VERSION}.linux-${GO_ARCH}.tar.gz && tar -C /usr/local -xzf go${GO_VERSION}.linux-${GO_ARCH}.tar.gz
 ENV GOPATH="/opt/go"
@@ -28,5 +75,4 @@ ARG GOYACC_VERSION=v0.6.0
 RUN go install golang.org/x/tools/cmd/goyacc@${GOYACC_VERSION}
 
 # minio for getting perf test data
-RUN wget -O /usr/local/bin/mcli https://dl.min.io/client/mc/release/linux-amd64/mc
-RUN chmod +x /usr/local/bin/mcli
+RUN wget -O /usr/local/bin/mcli "https://dl.min.io/client/mc/release/linux-${GO_ARCH}/mc" && chmod +x /usr/local/bin/mcli

pp/MODULE.bazel

@@ -5,8 +5,8 @@
 # For more details, please check https://github.com/bazelbuild/bazel/issues/18958
 ###############################################################################
 register_toolchains(
-    "//bazel/toolchain:cc_toolchain_for_g++-13_toolchain_aarch64",
-    "//bazel/toolchain:cc_toolchain_for_g++-13_toolchain_x86_64",
+    "//bazel/toolchain:cc_toolchain_for_g++-14_toolchain_aarch64",
+    "//bazel/toolchain:cc_toolchain_for_g++-14_toolchain_x86_64",
 )
 
 # Hedron's Compile Commands Extractor for Bazel

pp/bare_bones/bitset.h

@@ -12,6 +12,7 @@
 #include <atomic>
 #include <bitset>
 #include <numeric>
+#include <ranges>
 
 #include "bit.h"
 #include "concepts.h"
@@ -263,3 +264,12 @@ template <ReallocatorInterface Reallocator>
 struct IsZeroInitializable<GenericBitset<Reallocator>> : std::true_type {};
 
 }  // namespace BareBones
+
+// GenericBitset::size() is the allocated bit width, not ranges::distance(begin, end) (set-bit
+// count). GCC 14+ libstdc++ uses sized-range fast paths in std::ranges::equal; disable them.
+namespace std::ranges {
+
+template <BareBones::ReallocatorInterface R>
+inline constexpr bool disable_sized_range<BareBones::GenericBitset<R>> = true;
+
+}  // namespace std::ranges

pp/bazel/toolchain/BUILD

@@ -44,41 +44,15 @@ string_flag(
 )
 
 cc_toolchain_suite(
-    name = "g++-13",
+    name = "g++-14",
     toolchains = {
-        "k8": ":g++-13_toolchain_x86_64",
-        "aarch64": ":g++-13_toolchain_aarch64",
+        "k8": ":g++-14_toolchain_x86_64",
+        "aarch64": ":g++-14_toolchain_aarch64",
     },
 )
 
 filegroup(name = "empty")
 
-cc_toolchain(
-    name = "g++-13_toolchain_x86_64",
-    all_files = ":empty",
-    compiler_files = ":empty",
-    dwp_files = ":empty",
-    linker_files = ":empty",
-    objcopy_files = ":empty",
-    strip_files = ":empty",
-    supports_param_files = 0,
-    toolchain_config = ":g++-13_toolchain_config_x86_64",
-    toolchain_identifier = "g++-13_toolchain",
-)
-
-cc_toolchain(
-    name = "g++-13_toolchain_aarch64",
-    all_files = ":empty",
-    compiler_files = ":empty",
-    dwp_files = ":empty",
-    linker_files = ":empty",
-    objcopy_files = ":empty",
-    strip_files = ":empty",
-    supports_param_files = 0,
-    toolchain_config = ":g++-13_toolchain_config_aarch64",
-    toolchain_identifier = "g++-13_toolchain",
-)
-
 cc_toolchain(
     name = "g++-14_toolchain_x86_64",
     all_files = ":empty",
@@ -105,34 +79,6 @@ cc_toolchain(
     toolchain_identifier = "g++-14_toolchain",
 )
 
-toolchain(
-    name = "cc_toolchain_for_g++-13_toolchain_x86_64",
-    toolchain = ":g++-13_toolchain_x86_64",
-    toolchain_type = "@bazel_tools//tools/cpp:toolchain_type",
-    exec_compatible_with = [
-        "@platforms//cpu:x86_64",
-        "@platforms//os:linux",
-    ],
-    target_compatible_with = [
-        "@platforms//cpu:x86_64",
-        "@platforms//os:linux",
-    ],
-)
-
-toolchain(
-    name = "cc_toolchain_for_g++-13_toolchain_aarch64",
-    toolchain = ":g++-13_toolchain_aarch64",
-    toolchain_type = "@bazel_tools//tools/cpp:toolchain_type",
-    exec_compatible_with = [
-        "@platforms//cpu:aarch64",
-        "@platforms//os:linux",
-    ],
-    target_compatible_with = [
-        "@platforms//cpu:aarch64",
-        "@platforms//os:linux",
-    ],
-)
-
 toolchain(
     name = "cc_toolchain_for_g++-14_toolchain_x86_64",
     toolchain = ":g++-14_toolchain_x86_64",
@@ -161,34 +107,6 @@ toolchain(
     ],
 )
 
-cc_toolchain_config(
-    name = "g++-13_toolchain_config_x86_64",
-    builtin_include_directories = [
-        "/usr/lib/gcc/x86_64-alpine-linux-musl",
-        "/usr/lib/gcc/x86_64-linux-gnu/13",
-        "/usr/include",
-        "/usr/lib/linux",
-    ],
-    march = ":march",
-    with_asan = ":asan",
-    with_profiling = ":profiling",
-    profiling_opts = ":profiling_opts",
-)
-
-cc_toolchain_config(
-    name = "g++-13_toolchain_config_aarch64",
-    builtin_include_directories = [
-        "/usr/lib/gcc/aarch64-alpine-linux-musl/13.2.1/include/",
-        "/usr/lib/gcc/aarch64-linux-gnu/13",
-        "/usr/include",
-        "/usr/lib/linux",
-    ],
-    march = ":march",
-    with_asan = ":asan",
-    with_profiling = ":profiling",
-    profiling_opts = ":profiling_opts",
-)
-
 cc_toolchain_config(
     name = "g++-14_toolchain_config_x86_64",
     builtin_include_directories = [

pp/bazel/toolchain/cc_toolchain_config.bzl

@@ -204,10 +204,10 @@ def _impl(ctx):
                             flags = [
                                 "-static-libgcc",
                                 "-static-libstdc++",
-                                "-l:libstdc++.a",
+                                "-lstdc++",
                                 "-lm",
                                 "-lunwind",
-                                "-lstdc++_libbacktrace"
+                                "-lstdc++exp"
                             ],
                         ),
                     ]),

pp/entrypoint/metrics.cpp

@@ -11,7 +11,9 @@ using PromPP::Primitives::Go::String;
 
 extern "C" void prompp_metrics_register() {
   [[maybe_unused]] static auto _ = [] {
+#if JEMALLOC_AVAILABLE
     metrics::CreateMetricsPage<metrics::JemallocMetrics>();
+#endif
     return 0;
   }();
 }

pp/go/cppbridge/entrypoint.go

@@ -12,8 +12,8 @@ package cppbridge
 // #cgo amd64,!asan,dbg LDFLAGS: -l:amd64_entrypoint_init_aio_dbg.a -l:amd64_k8_entrypoint_aio_prefixed_dbg.a -l:amd64_nehalem_entrypoint_aio_prefixed_dbg.a -l:amd64_haswell_entrypoint_aio_prefixed_dbg.a
 // #cgo amd64,asan,!dbg LDFLAGS: -l:amd64_entrypoint_init_aio_opt_asan.a -l:amd64_k8_entrypoint_aio_prefixed_opt_asan.a -l:amd64_nehalem_entrypoint_aio_prefixed_opt_asan.a -l:amd64_haswell_entrypoint_aio_prefixed_opt_asan.a
 // #cgo amd64,asan,dbg LDFLAGS: -l:amd64_entrypoint_init_aio_dbg_asan.a -l:amd64_k8_entrypoint_aio_prefixed_dbg_asan.a -l:amd64_nehalem_entrypoint_aio_prefixed_dbg_asan.a -l:amd64_haswell_entrypoint_aio_prefixed_dbg_asan.a
-// #cgo !static LDFLAGS: -lstdc++ -lm -lgcc_eh -l:libunwind.a -llzma -lstdc++_libbacktrace
-// #cgo static LDFLAGS: -static -static-libgcc -static-libstdc++ -l:libstdc++.a -l:libm.a -l:libgcc_eh.a -l:libunwind.a -l:liblzma.a -l:libstdc++_libbacktrace.a
+// #cgo !static LDFLAGS: -lstdc++ -lm -lgcc_eh -l:libunwind.a -llzma -lstdc++exp
+// #cgo static LDFLAGS: -static -static-libgcc -static-libstdc++ -l:libstdc++.a -l:libm.a -l:libgcc_eh.a -l:libunwind.a -l:liblzma.a -l:libstdc++exp.a
 // #include "entrypoint.h"
 import "C" //nolint:gocritic // because otherwise it won't work
 import (

pp/go/cppbridge/metrics_test.go

@@ -1,6 +1,7 @@
 package cppbridge
 
 import (
+	"strings"
 	"testing"
 
 	"github.com/stretchr/testify/suite"
@@ -14,9 +15,17 @@ func TestCppMetricsSuite(t *testing.T) {
 	suite.Run(t, new(CppMetricsSuite))
 }
 
+// jemallocMetricDescPrefix matches the global jemalloc arena pool metrics that
+// are registered in init() via prompp_metrics_register. They are unrelated to
+// per-test metric pages and are filtered out of the suite's view of CppMetrics.
+const jemallocMetricDescPrefix = `Desc{fqName: "prompp_common_jemalloc_`
+
 func (s *CppMetricsSuite) getMetrics() []*CppMetric {
 	metrics := []*CppMetric(nil)
 	for metric := range CppMetrics {
+		if strings.HasPrefix(metric.descriptor.String(), jemallocMetricDescPrefix) {
+			continue
+		}
 		metrics = append(metrics, metric)
 	}
 

pp/metrics/jemalloc_metrics.h

@@ -3,6 +3,8 @@
 #include "bare_bones/jemalloc.h"
 #include "metrics_page.h"
 
+#if JEMALLOC_AVAILABLE
+
 namespace metrics {
 
 struct JemallocMetrics final : MetricsPage<JemallocMetrics> {
@@ -17,3 +19,5 @@ struct JemallocMetrics final : MetricsPage<JemallocMetrics> {
 };
 
 }  // namespace metrics
+
+#endif  // JEMALLOC_AVAILABLE

pp/primitives/go_metric.h

@@ -96,7 +96,7 @@ struct MetricDescriptor {
     for (const auto& label_pair : labels) {
       const_label_pairs.emplace_back(&label_pair);
     }
-    std::ranges::sort(const_label_pairs, [](const LabelPair* a, const LabelPair* b) { return a->name < b->name; });
+    std::ranges::sort(const_label_pairs, [](const LabelPair* a, const LabelPair* b) { return *a->name < *b->name; });
   }
 
   [[nodiscard]] PROMPP_ALWAYS_INLINE uint64_t calculate_id() const noexcept {

pp/scripts/test_coredump.sh

@@ -33,7 +33,7 @@ OLD_COREDUMP_USE_PID=0
 SAVE_COREDUMP=1
 SKIP_BUILD_TEST=0
 TEST_TARGET_NAME=bare_bones_coredump_test
-TEST_BUILD_COMMAND="bazel build --config=g++-13 $TEST_TARGET_NAME"
+TEST_BUILD_COMMAND="bazel build --config=g++-14 $TEST_TARGET_NAME"
 TEST_BINARY=./bazel-bin/$TEST_TARGET_NAME
 
 eval set -- "${options}"