https://github.com/libssh2/libssh2/commit/5d03b4f94ac6740e0085a6acda6fc417ca6ecc83

From 5d03b4f94ac6740e0085a6acda6fc417ca6ecc83 Mon Sep 17 00:00:00 2001
From: Viktor Szakats <commit@vsz.me>
Date: Sun, 13 Oct 2024 22:47:25 +0200
Subject: [PATCH] cmake: build but don't install static lib in certain
 conditions

Building 3 tests require static libssh2 lib. Some may prefer not to
create the static lib, yet prefer to build all tests, including those
3 that require it.

Detect such intent by looking for an explicit `BUILD_TESTING=ON` and
`BUILD_STATIC_LIBS=OFF`, then build the static lib anyway but without
installing it.

Reported-by: Eli Schwartz
Fixes #1450
Closes #1469
---
 CMakeLists.txt       | 5 +++++
 src/CMakeLists.txt   | 8 +++++---
 tests/CMakeLists.txt | 2 +-
 3 files changed, 11 insertions(+), 4 deletions(-)

--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -115,6 +115,11 @@ else()
   endif()
 endif()
 
+if(BUILD_TESTING AND NOT BUILD_STATIC_LIBS)
+  # Build static for tests only, but do not install it.
+  set(BUILD_STATIC_FOR_TESTS ON)
+endif()
+
 option(BUILD_EXAMPLES "Build libssh2 examples" ON)
 option(BUILD_TESTING "Build libssh2 test suite" ON)
 
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -94,7 +94,7 @@ set(_sources ${CSOURCES} ${HHEADERS})
 # when building both static and shared library. On Windows, with certain
 # toolchains (e.g. MSVC) these libraries get the same by default, overwriting
 # each other. MinGW is not affected.
-if(WIN32 AND BUILD_STATIC_LIBS AND BUILD_SHARED_LIBS AND
+if(WIN32 AND (BUILD_STATIC_LIBS OR BUILD_STATIC_FOR_TESTS) AND BUILD_SHARED_LIBS AND
    NOT STATIC_LIB_SUFFIX AND NOT IMPORT_LIB_SUFFIX AND
    CMAKE_STATIC_LIBRARY_SUFFIX STREQUAL CMAKE_IMPORT_LIBRARY_SUFFIX)
   set(STATIC_LIB_SUFFIX "_static")
@@ -103,8 +103,10 @@ endif()
 unset(_libssh2_export)
 
 # we want it to be called libssh2 on all platforms
-if(BUILD_STATIC_LIBS)
-  list(APPEND _libssh2_export ${LIB_STATIC})
+if(BUILD_STATIC_LIBS OR BUILD_STATIC_FOR_TESTS)
+  if(NOT BUILD_STATIC_FOR_TESTS)
+    list(APPEND _libssh2_export ${LIB_STATIC})
+  endif()
   add_library(${LIB_STATIC} STATIC ${_sources})
   add_library(${PROJECT_NAME}::${LIB_STATIC} ALIAS ${LIB_STATIC})
   target_compile_definitions(${LIB_STATIC} PRIVATE ${PRIVATE_COMPILE_DEFINITIONS} ${_libssh2_definitions})
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -89,7 +89,7 @@ foreach(_test IN LISTS DOCKER_TESTS STANDALONE_TESTS SSHD_TESTS)
   endif()
 
   # We support the same target as both Docker and SSHD test. Build those just once.
-  # Skip building tests that require the static lib when the static lib is disabled.
+  # Skip building tests that require the static lib when the static lib is not built.
   if(NOT TARGET ${_test} AND _lib_for_tests)
     add_executable(${_test} "${_test}.c")
     target_compile_definitions(${_test} PRIVATE "${CRYPTO_BACKEND_DEFINE}")