fn prepare_cmake_build()

in aws-lc-sys/builder/cmake_builder.rs [90:205]

• 102 lines of code
• 20 McCabe index (conditional complexity)

    fn prepare_cmake_build(&self) -> cmake::Config {
        let mut cmake_cfg = self.get_cmake_config();
        if let Some(generator) = optional_env_optional_crate_target("CMAKE_GENERATOR") {
            set_env("CMAKE_GENERATOR", generator);
        }

        if OutputLibType::default() == OutputLibType::Dynamic {
            cmake_cfg.define("BUILD_SHARED_LIBS", "1");
        } else {
            cmake_cfg.define("BUILD_SHARED_LIBS", "0");
        }

        if let Some(prefix) = &self.build_prefix {
            cmake_cfg.define("BORINGSSL_PREFIX", format!("{prefix}_"));
            let include_path = self.manifest_dir.join("generated-include");
            cmake_cfg.define(
                "BORINGSSL_PREFIX_HEADERS",
                include_path.display().to_string(),
            );
        }

        // Build flags that minimize our crate size.
        cmake_cfg.define("BUILD_TESTING", "OFF");
        cmake_cfg.define("BUILD_TOOL", "OFF");
        if cfg!(feature = "ssl") {
            cmake_cfg.define("BUILD_LIBSSL", "ON");
        } else {
            cmake_cfg.define("BUILD_LIBSSL", "OFF");
        }
        if is_no_pregenerated_src() {
            // Go and Perl will be required.
            cmake_cfg.define("DISABLE_PERL", "OFF");
            cmake_cfg.define("DISABLE_GO", "OFF");
        } else {
            // Build flags that minimize our dependencies.
            cmake_cfg.define("DISABLE_PERL", "ON");
            cmake_cfg.define("DISABLE_GO", "ON");
        }

        if is_no_asm() {
            let opt_level = cargo_env("OPT_LEVEL");
            if opt_level == "0" {
                cmake_cfg.define("OPENSSL_NO_ASM", "1");
            } else {
                panic!("AWS_LC_SYS_NO_ASM only allowed for debug builds!")
            }
        }

        if cfg!(feature = "asan") {
            set_env_for_target("CC", "clang");
            set_env_for_target("CXX", "clang++");

            cmake_cfg.define("ASAN", "1");
        }

        let cflags = get_crate_cflags();
        if !cflags.is_empty() {
            set_env_for_target("CFLAGS", cflags);
        }

        if target_env() == "ohos" {
            Self::configure_open_harmony(&mut cmake_cfg);
            return cmake_cfg;
        }

        // cmake-rs has logic that strips Optimization/Debug options that are passed via CFLAGS:
        // https://github.com/rust-lang/cmake-rs/issues/240
        // This breaks build configurations that generate warnings when optimizations
        // are disabled.
        Self::preserve_cflag_optimization_flags(&mut cmake_cfg);

        // Allow environment to specify CMake toolchain.
        if let Some(toolchain) = optional_env_optional_crate_target("CMAKE_TOOLCHAIN_FILE") {
            set_env_for_target("CMAKE_TOOLCHAIN_FILE", toolchain);
            return cmake_cfg;
        }
        // We only consider compiler CFLAGS when no cmake toolchain is set
        self.apply_universal_build_options(&mut cmake_cfg);

        // See issue: https://github.com/aws/aws-lc-rs/issues/453
        if target_os() == "windows" {
            self.configure_windows(&mut cmake_cfg);
        }

        // If the build environment vendor is Apple
        #[cfg(target_vendor = "apple")]
        {
            if target_arch() == "aarch64" {
                cmake_cfg.define("CMAKE_OSX_ARCHITECTURES", "arm64");
                cmake_cfg.define("CMAKE_SYSTEM_PROCESSOR", "arm64");
            }
            if target_arch() == "x86_64" {
                cmake_cfg.define("CMAKE_OSX_ARCHITECTURES", "x86_64");
                cmake_cfg.define("CMAKE_SYSTEM_PROCESSOR", "x86_64");
            }
            if target_os().trim() == "ios" {
                cmake_cfg.define("CMAKE_SYSTEM_NAME", "iOS");
                if effective_target().ends_with("-ios-sim") || target_arch() == "x86_64" {
                    cmake_cfg.define("CMAKE_OSX_SYSROOT", "iphonesimulator");
                } else {
                    cmake_cfg.define("CMAKE_OSX_SYSROOT", "iphoneos");
                }
                cmake_cfg.define("CMAKE_THREAD_LIBS_INIT", "-lpthread");
            }
            if target_os().trim() == "macos" {
                cmake_cfg.define("CMAKE_SYSTEM_NAME", "Darwin");
                cmake_cfg.define("CMAKE_OSX_SYSROOT", "macosx");
            }
        }

        if target_os() == "android" {
            self.configure_android(&mut cmake_cfg);
        }

        cmake_cfg
    }