Add support for vcpkg CRT and library linkage customization

Author: mrexodia

docs/cmake-toml.md

@@ -97,6 +97,8 @@ include-after = ["cmake/after-subdir.cmake"]
 version = "2021.05.12"
 url = "https://github.com/microsoft/vcpkg/archive/refs/tags/2021.05.12.tar.gz"
 packages = ["fmt", "zlib"]
+crt-linkage = "dynamic"
+library-linkage = "dynamic"
 ```
 
 The vcpkg `version` will automatically generate the `url` from the [official repository](https://github.com/microsoft/vcpkg/releases). For a custom registry you can specify your own `url` (and omit the `version`). You can browse available packages on [vcpkg.io](https://vcpkg.io/en/packages.html).
@@ -114,6 +116,8 @@ config = true
 components = ["mycomponent"]
 ```
 
+The `crt-linkage` specifies the MSVC runtime library variant to use while compiling packages. `library-linkage` is whether libraries built are dynamic (default) or static.
+
 ## FetchContent
 
 **Note**: The `[fetch-content]` feature is unpolished and will likely change in a future release.

docs/examples/vcpkg.md

@@ -21,6 +21,8 @@ description = "Dependencies from vcpkg"
 [vcpkg]
 version = "2021.05.12"
 packages = ["fmt"]
+crt-linkage = "dynamic"
+library-linkage = "dynamic"
 
 [find-package]
 fmt = {}

include/project_parser.hpp

@@ -39,6 +39,8 @@ struct Package {
 struct Vcpkg {
     std::string version;
     std::string url;
+    std::string crt_linkage;
+    std::string library_linkage;
 
     struct Package {
         std::string name;

src/cmake_generator.cpp

@@ -634,6 +634,12 @@ void generate_cmake(const char *path, const parser::Project *parent_project) {
             cmd("message")("STATUS", "Fetching vcpkg (" + version_name + ")...");
             cmd("FetchContent_Declare")("vcpkg", "URL", url);
             cmd("FetchContent_MakeAvailable")("vcpkg");
+            if (!project.vcpkg.crt_linkage.empty()) {
+                cmd("set")("VCPKG_CRT_LINKAGE", project.vcpkg.crt_linkage);
+            }
+            if (!project.vcpkg.library_linkage.empty()) {
+                cmd("set")("VCPKG_LIBRARY_LINKAGE", project.vcpkg.library_linkage);
+            }
             cmd("include")("${vcpkg_SOURCE_DIR}/scripts/buildsystems/vcpkg.cmake");
         cmd("endif")();
         endl();

src/project_parser.cpp

@@ -627,6 +627,19 @@ Project::Project(const Project *parent, const std::string &path, bool build) {
         auto &v = checker.create(toml, "vcpkg");
         v.optional("url", vcpkg.url);
         v.optional("version", vcpkg.version);
+
+        auto handle_linkage = [&v](const toml::key &ky, std::string &value) {
+            if (v.contains(ky)) {
+                v.required(ky, value);
+                if (value != "dynamic" && value != "static") {
+                    throw std::runtime_error(format_key_error("Unknown linkage, expected dynamic/static", value, v.find(ky)));
+                }
+            }
+        };
+
+        handle_linkage("crt-linkage", vcpkg.crt_linkage);
+        handle_linkage("library-linkage", vcpkg.library_linkage);
+
         for (const auto &p : v.find("packages").as_array()) {
             Vcpkg::Package package;
             const auto &package_str = p.as_string().str;

tests/vcpkg/cmake.toml

@@ -9,6 +9,8 @@ description = "Dependencies from vcpkg"
 [vcpkg]
 version = "2021.05.12"
 packages = ["fmt"]
+crt-linkage = "dynamic"
+library-linkage = "dynamic"
 
 [find-package]
 fmt = {}