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Alexander J. Semenuk 5d5e35fb9b fix: Windows toolchain compatibility (curl 8.21 re-vendor, endless reconfigure loop) (#4355)
## Problem

Windows builds break with a current local toolchain (Scoop LLVM 22.1.8,
CMake 4.4.0, VS 2026), in two independent ways:

1. The build stops at curl's deliberate guard: `#error "no non-blocking
method was found/used/set"` in `third-party/curl/lib/nonblock.c`.
2. From the second configure onward, `cmake --build` re-runs CMake in an
endless loop (observed 42 consecutive reconfigure cycles in a single
build). Likely the same mechanism behind the "endlessly building" VS
2026 note in `docs/setup/dev/vs.md`.

## Root cause

1. `third-party/curl/CMake/CurlTests.c` passes `int *` to
`ioctlsocket()`, whose third parameter is `u_long *`. Clang 22 promotes
`-Wincompatible-pointer-types` to a hard error in C, so the
`HAVE_IOCTLSOCKET_FIONBIO` try_compile silently fails and
`curl_config.h` never defines it. Upstream CI does not see this because
the windows-2022 runner image ships an older LLVM. GCC 14 promotes the
same warning to a hard error, which is very likely the `CurlTests.c.obj`
failure reported from MSYS2 in open-goal/jak-project#3551. Upstream curl
hit the identical problem with GCC 14 and fixed the probe in curl 8.8.0
(curl/curl#13578).
2. The root CMakeLists copies the build tree's `compile_commands.json`
into `<src>/build/` for clangd using `configure_file()`, which registers
its input as a configure dependency. CMake rewrites
`compile_commands.json` late in every generation, after
`CTestTestfile.cmake` and `cmake_install.cmake` (outputs of the same
Ninja regen rule), so once the dependency is registered the rule is
deterministically dirty and every `ninja` invocation re-runs CMake. A
pristine first configure is safe (the file does not exist yet, so the
`if(EXISTS ...)` guard skips the copy), which is why the loop looks
machine- or IDE-specific.

## Fix

1. Per review, re-vendor `third-party/curl` at the `curl-8_21_0` tag
(previously `curl-8_3_0`), which carries the upstream probe fix plus two
years of upstream development; `vendor.yaml` updated to match.
Adjustments the version jump forced:
- curl 8.15 removed the native macOS Secure Transport backend
(`CURL_USE_SECTRANSP`), so macOS now builds curl against OpenSSL like
Linux. The two macOS workflows install Homebrew `openssl@3` and export
`OPENSSL_ROOT_DIR` (keg-only), and the macOS setup docs gained the same
two lines.
- `CURL_BROTLI` / `CURL_ZSTD` switched to AUTO-detection in curl 8.10;
pinned OFF to keep the previous no-compression behavior and avoid
silently linking whatever the CI images happen to have.
- curl's new top-level `BUILD_EXAMPLES` cache option (default ON) leaked
into discord-rpc's identically named option and broke configure at a
nonexistent `examples/send-presence` directory; pinned OFF ahead of the
third-party subdirectories.

The diff is dominated by the mechanical tag-tree swap under
`third-party/curl` (linguist-vendored, collapsed in review). The
hand-written changes are `CMakeLists.txt`, the two macOS workflows,
`docs/setup/system/macos.md`, and `vendor.yaml`.
2. Swap `configure_file()` for `file(COPY ...)`: the same clangd copy
with no configure dependency registered. (`file(COPY_FILE ...
ONLY_IF_DIFFERENT)` would be cleaner still but requires CMake 3.21,
above the declared `cmake_minimum_required(VERSION 3.10)`.)

## Test plan

- [x] Fresh `cmake --preset Release-windows-clang` (LLVM 22, no cache
seeding) completes and logs `Enabled SSL backends: Schannel`; the
FIONBIO probe passes without the previous `#error`
- [x] Full Windows Release build from scratch in the branch worktree
(all 1422 targets)
- [x] goalc-test suite: 1509 passed, 0 failed
- [x] Second consecutive configure with `compile_commands.json` present:
the regen rule in `build.ninja` has no `compile_commands.json` input;
`<src>/build/compile_commands.json` is still refreshed for clangd
- [x] Repeated `ninja` invocations after a full build no longer re-run
CMake
- [x] macOS Intel and ARM CI green (first exercise of the OpenSSL
backend switch)

---

I work off a self-hosted forge, so this GitHub account is quiet; the
configure logs and ninja dirty-node traces from the investigation are
available if anyone wants the raw data.

(AI-assisted)
2026-07-27 19:19:18 -04:00

95 lines
3.3 KiB
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Generated

#!/bin/sh -x
# Copyright (C) Viktor Szakats
#
# SPDX-License-Identifier: curl
# shellcheck disable=SC2086
set -eu
cd "$(dirname "$0")"
mode="${1:-all}"; shift
cmake_consumer="${TEST_CMAKE_CONSUMER:-cmake}"
cmake_provider="${TEST_CMAKE_PROVIDER:-${cmake_consumer}}"
gen="${TEST_CMAKE_GENERATOR:-Ninja}"
cmake_opts='-DBUILD_CURL_EXE=OFF -DBUILD_LIBCURL_DOCS=OFF -DBUILD_MISC_DOCS=OFF -DENABLE_CURL_MANUAL=OFF'
src='../..'
runresults() {
set +x
for bin in "$1"/test-consumer*; do
file "${bin}" || true
${TEST_CMAKE_EXE_RUNNER:-} "${bin}" || true
done
set -x
}
if [ "${mode}" = 'all' ] || [ "${mode}" = 'ExternalProject' ]; then
(cd "${src}"; git archive --format=tar HEAD) | gzip > source.tar.gz
src="${PWD}/source.tar.gz"
sha="$(sha256sum "${src}" | grep -a -i -o -w -E '[0-9a-f]{64}')"
bldc='bld-externalproject'
rm -rf "${bldc}"
"${cmake_consumer}" -B "${bldc}" -G "${gen}" ${TEST_CMAKE_FLAGS:-} -DCURL_TEST_OPTS="${cmake_opts} -DCMAKE_UNITY_BUILD=ON $*" \
-DTEST_INTEGRATION_MODE=ExternalProject \
-DFROM_ARCHIVE="${src}" -DFROM_HASH="${sha}"
"${cmake_consumer}" --build "${bldc}" --verbose
runresults "${bldc}"
fi
if [ "${mode}" = 'all' ] || [ "${mode}" = 'FetchContent' ]; then
src="${PWD}/${src}"
bldc='bld-fetchcontent'
rm -rf "${bldc}"
"${cmake_consumer}" -B "${bldc}" -G "${gen}" ${cmake_opts} -DCMAKE_UNITY_BUILD=ON ${TEST_CMAKE_FLAGS:-} "$@" \
-DTEST_INTEGRATION_MODE=FetchContent \
-DFROM_GIT_REPO="${src}" \
-DFROM_GIT_TAG="$(git rev-parse HEAD)"
"${cmake_consumer}" --build "${bldc}" --verbose
PATH="${bldc}/_deps/curl-build/lib:${PATH}"
runresults "${bldc}"
fi
if [ "${mode}" = 'all' ] || [ "${mode}" = 'add_subdirectory' ]; then
rm -rf curl
if ! ln -s "${src}" curl; then
rm -rf curl; mkdir curl; (cd "${src}"; git archive --format=tar HEAD) | tar -x --directory=curl # for MSYS2/Cygwin
fi
bldc='bld-add_subdirectory'
rm -rf "${bldc}"
"${cmake_consumer}" -B "${bldc}" -G "${gen}" ${cmake_opts} -DCMAKE_UNITY_BUILD=ON ${TEST_CMAKE_FLAGS:-} "$@" \
-DTEST_INTEGRATION_MODE=add_subdirectory
"${cmake_consumer}" --build "${bldc}" --verbose
PATH="${bldc}/curl/lib:${PATH}"
runresults "${bldc}"
fi
if [ "${mode}" = 'all' ] || [ "${mode}" = 'find_package' ]; then
src="${PWD}/${src}"
bldp='bld-curl'
prefix="${PWD}/${bldp}/_pkg"
rm -rf "${bldp}"
"${cmake_provider}" -B "${bldp}" -S "${src}" -G "${gen}" ${cmake_opts} -DCMAKE_UNITY_BUILD=ON ${TEST_CMAKE_FLAGS:-} ${TEST_CMAKE_FLAGS_PROVIDER:-} "$@" \
-DBUILD_SHARED_LIBS=ON \
-DBUILD_STATIC_LIBS=ON \
-DCMAKE_INSTALL_PREFIX="${prefix}"
"${cmake_provider}" --build "${bldp}" --verbose
"${cmake_provider}" --install "${bldp}"
echo '::group::libcurl.pc'; cat "${prefix}"/lib/pkgconfig/*.pc || true; echo '::endgroup::'
echo '::group::curl-config.cmake'; cat "${prefix}"/lib/cmake/CURL/CURL* || true; echo '::endgroup::'
echo '::group::curl-config'; cat "${prefix}"/bin/curl-config || true; echo '::endgroup::'
bldc='bld-find_package'
rm -rf "${bldc}"
"${cmake_consumer}" -B "${bldc}" -G "${gen}" ${TEST_CMAKE_FLAGS:-} ${TEST_CMAKE_FLAGS_CONSUMER:-} \
-DTEST_INTEGRATION_MODE=find_package \
-DCMAKE_PREFIX_PATH="${prefix}/lib/cmake/CURL"
"${cmake_consumer}" --build "${bldc}" --verbose
PATH="${prefix}/bin:${PATH}"
runresults "${bldc}"
fi