Jul 29, 2025 · Jul 29, 2025
diff --git a/test/functional/toolchains/cmake/test_cmake_toolchain.py b/test/functional/toolchains/cmake/test_cmake_toolchain.py
    else:
        client.run("build . -s compiler.cppstd=11")
        # It doesn't fail


 @pytest.mark.skipif(platform.system() != "Windows", reason="Only for windows")
 @pytest.mark.tool("cmake")
 def test_cmaketoolchain_check_function_exists():
    c = TestClient()
    conanfile = textwrap.dedent("""
        from conan import ConanFile
        from conan.tools.cmake import CMake, CMakeToolchain
        class Conan(ConanFile):
            settings = "os", "compiler", "arch", "build_type"

            def generate(self):
                tc = CMakeToolchain(self)
                # This gets back to older default behavior
                # tc.blocks["try_compile"].values["config"] = None
                tc.generate()

            def build(self):
                CMake(self).configure()
        """)
    consumer = textwrap.dedent("""
        cmake_minimum_required(VERSION 3.15)
        project(MyHello C)

        include(CheckFunctionExists)
        check_function_exists(pow HAVE_POW)
        check_function_exists(sin HAVE_SIN)
        if(NOT HAVE_POW OR NOT HAVE_SIN)
            message(FATAL_ERROR "Not math!!!!!")
        endif()
       """)
    c.save({"conanfile.py": conanfile,
            "CMakeLists.txt": consumer})

    c.run("build . ")  # Release breaks the check
    print(c.out)
Original file line number	Diff line number	Diff line change
Expand Up		@@ -2063,3 +2063,40 @@ def build(self):
		else:
		client.run("build . -s compiler.cppstd=11")
		# It doesn't fail


		@pytest.mark.skipif(platform.system() != "Windows", reason="Only for windows")
		@pytest.mark.tool("cmake")
		def test_cmaketoolchain_check_function_exists():
		c = TestClient()
		conanfile = textwrap.dedent("""
		from conan import ConanFile
		from conan.tools.cmake import CMake, CMakeToolchain
		class Conan(ConanFile):
		settings = "os", "compiler", "arch", "build_type"

		def generate(self):
		tc = CMakeToolchain(self)
		# This gets back to older default behavior
		# tc.blocks["try_compile"].values["config"] = None
		tc.generate()

		def build(self):
		CMake(self).configure()
		""")
		consumer = textwrap.dedent("""
		cmake_minimum_required(VERSION 3.15)
		project(MyHello C)

		include(CheckFunctionExists)
		check_function_exists(pow HAVE_POW)
		check_function_exists(sin HAVE_SIN)
		if(NOT HAVE_POW OR NOT HAVE_SIN)
		message(FATAL_ERROR "Not math!!!!!")
		endif()
		""")
		c.save({"conanfile.py": conanfile,
		"CMakeLists.txt": consumer})

		c.run("build . ") # Release breaks the check
		print(c.out)