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cmake: add CMake Config-based dependency detection

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After limiting `find_package()`/`find_dependency()` calls to curl local
Find modules via the `MODULES` keyword, it became possible to detect
dependencies via CMake Configs from within those local Find modules, by
calling `find_package()` again with the `CONFIG` keyword. This patch
implements this. Then maps detection results to the result variables and
curl-specific imported targets the rest of the build expects.

Also honor recently introduced `*_USE_STATIC_LIBS` (experimental) flags
to map to the static target when requested.

This adds CMake Configs as an alternative to the existing `pkg-config`
and `find_path()`/`find_library()` auto-detection methods.

Enabled by default for MSVC, outside vcpkg and when not cross-building.
To enable for other cases, or override the default, you can use
`-DCURL_USE_CMAKECONFIG=ON` or `OFF`.

When enabled, Config detection happens after `pkg-config` and before
`find_path()`/`find_library()`. Using CMake's built-in options, you may
also manually point to the absolute directory holding Config files:

`Libssh2_DIR`, `MbedTLS_DIR`, `NGHTTP2_DIR`, `NGHTTP3_DIR`,
`NGTCP2_DIR` v1.19.0+ (with non-fork OpenSSL only), `Zstd_DIR` v1.4.5+

E.g. `-DMbedTLS_DIR=/path/to/mbedtls/lib/cmake/MbedTLS`

These dependencies typically need to be built with CMake to support
this.

Tagged as experimental.

Refs:
#20013 #19156 #19117
https://github.com/curl/curl/pull/20784#issuecomment-3984318492

Depends-on: fad1ebaecc #20840
Follow-up to 91e06fde1b #20784
Follow-up to 26c39d8df1 #20015

Closes #20814
This commit is contained in:
Viktor Szakats 2026-03-03 14:48:32 +01:00
parent aef8fd00c8
commit 8fce3e17e6
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11 changed files with 142 additions and 29 deletions
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6
.github/workflows/configure-vs-cmake.yml vendored
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@ -52,7 +52,7 @@ jobs:
mkdir bld-am && cd bld-am && ../configure --enable-static=no --with-openssl --without-libpsl
- name: 'run cmake'
run: cmake -B bld-cm -DCURL_WERROR=ON -DCURL_USE_LIBPSL=OFF
run: cmake -B bld-cm -DCURL_WERROR=ON -DCURL_USE_CMAKECONFIG=OFF -DCURL_USE_LIBPSL=OFF
- name: 'configure log'
run: cat bld-am/config.log 2>/dev/null || true
@ -101,7 +101,7 @@ jobs:
- name: 'run cmake'
run: |
cmake -B bld-cm -DCURL_WERROR=ON -DCURL_USE_LIBPSL=OFF -DCURL_DISABLE_LDAP=ON \
cmake -B bld-cm -DCURL_WERROR=ON -DCURL_USE_CMAKECONFIG=OFF -DCURL_USE_LIBPSL=OFF -DCURL_DISABLE_LDAP=ON \
-DCMAKE_C_COMPILER_TARGET="$(uname -m | sed 's/arm64/aarch64/')-apple-darwin$(uname -r)" \
-DCURL_USE_LIBSSH2=OFF -DUSE_APPLE_SECTRUST=ON
@ -148,7 +148,7 @@ jobs:
- name: 'run cmake'
run: |
cmake -B bld-cm -DCURL_WERROR=ON -DCURL_USE_SCHANNEL=ON -DCURL_USE_LIBPSL=OFF \
cmake -B bld-cm -DCURL_WERROR=ON -DCURL_USE_CMAKECONFIG=OFF -DCURL_USE_SCHANNEL=ON -DCURL_USE_LIBPSL=OFF \
-DCMAKE_SYSTEM_NAME=Windows \
-DCMAKE_C_COMPILER_TARGET="${TRIPLET}" \
-DCMAKE_C_COMPILER="${TRIPLET}-gcc"