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cmake: fix building with CMAKE_FIND_PACKAGE_PREFER_CONFIG=ON

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This CMake global custom option tells it to find dependencies as cmake
Configs first, and only then look for `Find*` modules. This may result
in `find_package()` succeeding, but without actually creating `CURL::*`
imported targets the curl build scripts are expecting.

For dependencies with curl-specific, local, `Find*` modules, we always
want to use them, via the module detection method, and never a
Config-based detection. Ensure this by passing the `MODULE` option to
`find_package()` and `find_dependency()` to make them use `Find*`
modules unconditionally, making them work as expected with the
`CMAKE_FIND_PACKAGE_PREFER_CONFIG=ON` option set.

curl uses local Find modules for all dependencies except OpenSSL and
ZLIB. The latter two keep using either CMake's built-in Find modules or
Config method as before this patch.

Also:

- apply the same change to `curl-config.cmake`. To fix consuming curl
  with this option set.
  Authored-by: Valerie Snyder
  Ref: #20764
  Follow-up to 16f073ef49 #16973

- GHA/distcheck: add a job testing both building and consuming curl with
  this option set. (takes 15 seconds)
  Use custom NGHTTP2 configuration for an extra twist (not required
  to trigger this issue.)
  Follow-up to fcde8d7e37 #20773

Reported-by: Valerie Snyder
Fixes #20729

Closes #20784
This commit is contained in:
Viktor Szakats 2026-03-01 16:19:33 +01:00
parent 3d708e239b
commit 91e06fde1b
No known key found for this signature in database
4 changed files with 64 additions and 50 deletions
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52
CMakeLists.txt
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@ -401,7 +401,7 @@ set(CURL_LIBS "")
if(ENABLE_ARES)
set(USE_ARES 1)
find_package(Cares REQUIRED)
find_package(Cares MODULE REQUIRED)
list(APPEND CURL_LIBS CURL::cares)
endif()
@ -848,7 +848,7 @@ if(CURL_USE_OPENSSL)
endif()
if(CURL_USE_MBEDTLS)
find_package(MbedTLS REQUIRED)
find_package(MbedTLS MODULE REQUIRED)
if(MBEDTLS_VERSION VERSION_LESS 3.2.0)
message(FATAL_ERROR "mbedTLS v3.2.0 or newer is required.")
endif()
@ -873,7 +873,7 @@ if(CURL_USE_MBEDTLS)
endif()
if(CURL_USE_WOLFSSL)
find_package(WolfSSL REQUIRED)
find_package(WolfSSL MODULE REQUIRED)
set(_ssl_enabled ON)
set(USE_WOLFSSL ON)
list(APPEND CURL_LIBS CURL::wolfssl)
@ -891,9 +891,9 @@ if(CURL_USE_WOLFSSL)
endif()
if(CURL_USE_GNUTLS)
find_package(GnuTLS REQUIRED)
find_package(GnuTLS MODULE REQUIRED)
list(APPEND CURL_LIBS CURL::gnutls)
find_package(Nettle REQUIRED)
find_package(Nettle MODULE REQUIRED)
list(APPEND CURL_LIBS CURL::nettle)
set(_ssl_enabled ON)
set(USE_GNUTLS ON)
@ -914,7 +914,7 @@ if(CURL_USE_GNUTLS)
endif()
if(CURL_USE_RUSTLS)
find_package(Rustls REQUIRED)
find_package(Rustls MODULE REQUIRED)
set(_ssl_enabled ON)
set(USE_RUSTLS ON)
list(APPEND CURL_LIBS CURL::rustls)
@ -1088,7 +1088,7 @@ endif()
option(USE_NGHTTP2 "Use nghttp2 library" ON)
if(USE_NGHTTP2)
find_package(NGHTTP2)
find_package(NGHTTP2 MODULE)
if(NGHTTP2_FOUND)
list(APPEND CURL_LIBS CURL::nghttp2)
else()
@ -1102,33 +1102,33 @@ if(USE_NGTCP2)
message(FATAL_ERROR "MultiSSL cannot be enabled with HTTP/3 and vice versa.")
elseif(USE_OPENSSL OR USE_WOLFSSL)
if(USE_WOLFSSL)
find_package(NGTCP2 REQUIRED COMPONENTS "wolfSSL")
find_package(NGTCP2 MODULE REQUIRED COMPONENTS "wolfSSL")
elseif(HAVE_BORINGSSL OR HAVE_AWSLC)
find_package(NGTCP2 REQUIRED COMPONENTS "BoringSSL")
find_package(NGTCP2 MODULE REQUIRED COMPONENTS "BoringSSL")
elseif(OPENSSL_VERSION VERSION_GREATER_EQUAL 3.5.0)
find_package(NGTCP2 REQUIRED COMPONENTS "ossl")
find_package(NGTCP2 MODULE REQUIRED COMPONENTS "ossl")
if(NGTCP2_VERSION VERSION_LESS 1.12.0)
message(FATAL_ERROR "ngtcp2 1.12.0 or upper required for OpenSSL")
endif()
set(OPENSSL_QUIC_API2 1)
elseif(HAVE_LIBRESSL)
find_package(NGTCP2 COMPONENTS "LibreSSL")
find_package(NGTCP2 MODULE COMPONENTS "LibreSSL")
if(NOT NGTCP2_FOUND)
find_package(NGTCP2 REQUIRED COMPONENTS "quictls") # for ngtcp2 <1.15.0
find_package(NGTCP2 MODULE REQUIRED COMPONENTS "quictls") # for ngtcp2 <1.15.0
endif()
else()
find_package(NGTCP2 REQUIRED COMPONENTS "quictls")
find_package(NGTCP2 MODULE REQUIRED COMPONENTS "quictls")
set(_openssl "quictls")
endif()
curl_openssl_check_quic()
elseif(USE_GNUTLS)
find_package(NGTCP2 REQUIRED "GnuTLS")
find_package(NGTCP2 MODULE REQUIRED "GnuTLS")
else()
message(FATAL_ERROR "ngtcp2 requires a supported TLS-backend")
endif()
list(APPEND CURL_LIBS CURL::ngtcp2)
find_package(NGHTTP3 REQUIRED)
find_package(NGHTTP3 MODULE REQUIRED)
set(USE_NGHTTP3 ON)
list(APPEND CURL_LIBS CURL::nghttp3)
endif()
@ -1140,7 +1140,7 @@ if(USE_QUICHE)
elseif(CURL_WITH_MULTI_SSL)
message(FATAL_ERROR "MultiSSL cannot be enabled with HTTP/3 and vice versa.")
endif()
find_package(Quiche REQUIRED)
find_package(Quiche MODULE REQUIRED)
if(NOT HAVE_BORINGSSL)
message(FATAL_ERROR "quiche requires BoringSSL")
endif()
@ -1176,7 +1176,7 @@ if(NOT CURL_DISABLE_LDAP)
if(USE_OPENSSL)
list(APPEND CMAKE_REQUIRED_LIBRARIES OpenSSL::SSL OpenSSL::Crypto)
endif()
find_package(LDAP)
find_package(LDAP MODULE)
if(LDAP_FOUND)
set(HAVE_LBER_H 1)
set(CURL_LIBS CURL::ldap ${CURL_LIBS})
@ -1244,7 +1244,7 @@ option(USE_LIBIDN2 "Use libidn2 for IDN support" ON)
set(HAVE_IDN2_H OFF)
set(HAVE_LIBIDN2 OFF)
if(USE_LIBIDN2 AND NOT USE_APPLE_IDN AND NOT USE_WIN32_IDN)
find_package(Libidn2)
find_package(Libidn2 MODULE)
if(LIBIDN2_FOUND)
set(CURL_LIBS CURL::libidn2 ${CURL_LIBS})
set(HAVE_IDN2_H 1)
@ -1257,7 +1257,7 @@ option(CURL_USE_LIBPSL "Use libpsl" ON)
mark_as_advanced(CURL_USE_LIBPSL)
set(USE_LIBPSL OFF)
if(CURL_USE_LIBPSL)
find_package(Libpsl REQUIRED)
find_package(Libpsl MODULE REQUIRED)
list(APPEND CURL_LIBS CURL::libpsl)
set(USE_LIBPSL ON)
endif()
@ -1267,7 +1267,7 @@ option(CURL_USE_LIBSSH2 "Use libssh2" ON)
mark_as_advanced(CURL_USE_LIBSSH2)
set(USE_LIBSSH2 OFF)
if(CURL_USE_LIBSSH2)
find_package(Libssh2)
find_package(Libssh2 MODULE)
if(LIBSSH2_FOUND)
set(CURL_LIBS CURL::libssh2 ${CURL_LIBS}) # keep it before TLS-crypto, compression
set(USE_LIBSSH2 ON)
@ -1278,7 +1278,7 @@ endif()
option(CURL_USE_LIBSSH "Use libssh" OFF)
mark_as_advanced(CURL_USE_LIBSSH)
if(NOT USE_LIBSSH2 AND CURL_USE_LIBSSH)
find_package(Libssh REQUIRED)
find_package(Libssh MODULE REQUIRED)
set(CURL_LIBS CURL::libssh ${CURL_LIBS}) # keep it before TLS-crypto, compression
set(USE_LIBSSH ON)
endif()
@ -1286,7 +1286,7 @@ endif()
option(CURL_USE_GSASL "Use libgsasl" OFF)
mark_as_advanced(CURL_USE_GSASL)
if(CURL_USE_GSASL)
find_package(Libgsasl REQUIRED)
find_package(Libgsasl MODULE REQUIRED)
list(APPEND CURL_LIBS CURL::libgsasl)
set(USE_GSASL ON)
endif()
@ -1295,7 +1295,7 @@ option(CURL_USE_GSSAPI "Use GSSAPI implementation" OFF)
mark_as_advanced(CURL_USE_GSSAPI)
if(CURL_USE_GSSAPI)
find_package(GSS)
find_package(GSS MODULE)
set(HAVE_GSSAPI ${GSS_FOUND})
if(GSS_FOUND)
@ -1321,7 +1321,7 @@ if(CURL_USE_LIBBACKTRACE)
if(NOT CMAKE_BUILD_TYPE MATCHES "(Debug|RelWithDebInfo)")
message(FATAL_ERROR "libbacktrace requires debug information")
endif()
find_package(Libbacktrace REQUIRED)
find_package(Libbacktrace MODULE REQUIRED)
list(APPEND CURL_LIBS CURL::libbacktrace)
set(USE_BACKTRACE ON)
endif()
@ -1332,7 +1332,7 @@ if(CURL_USE_LIBUV)
if(NOT ENABLE_DEBUG)
message(FATAL_ERROR "Using libuv without debug support enabled is useless")
endif()
find_package(Libuv REQUIRED)
find_package(Libuv MODULE REQUIRED)
list(APPEND CURL_LIBS CURL::libuv)
set(USE_LIBUV ON)
set(HAVE_UV_H ON)
@ -1340,7 +1340,7 @@ endif()
option(USE_LIBRTMP "Enable librtmp from rtmpdump" OFF)
if(USE_LIBRTMP)
find_package(Librtmp REQUIRED)
find_package(Librtmp MODULE REQUIRED)
list(APPEND CURL_LIBS CURL::librtmp)
endif()