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Merged
mrexodia merged 2 commits into from
Feb 1, 2026
Merged

Add support for conditional [project].languages #195

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4772a2b
Add support for conditional [project].languages
mrexodia Feb 1, 2026
433dbb0
Add test for conditional Objective-C support
mrexodia Feb 1, 2026
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30 changes: 30 additions & 0 deletions docs/examples/objective-c.md
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---
# Automatically generated from tests/objective-c/cmake.toml - DO NOT EDIT
layout: default
title: Objective-C
permalink: /examples/objective-c
parent: Examples
nav_order: 11
---

# Objective-C

Add Objective-C sources on Apple platforms:

```toml
[project]
name = "objective-c"
description = "Objective-C"
languages = ["C"]
apple.languages = ["OBJC"]

[target.hello]
type = "executable"
sources = ["src/main.c"]
apple.sources = ["src/apple.m"]
apple.link-libraries = ["$<LINK_LIBRARY:FRAMEWORK,Foundation>"]
```



<sup><sub>This page was automatically generated from [tests/objective-c/cmake.toml](https://github.com/build-cpp/cmkr/tree/main/tests/objective-c/cmake.toml).</sub></sup>
2 changes: 1 addition & 1 deletion include/project_parser.hpp
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Expand Up @@ -194,7 +194,7 @@ struct Project {
std::string project_name;
std::string project_version;
std::string project_description;
std::vector<std::string> project_languages;
ConditionVector project_languages;
bool project_allow_unknown_languages = false;
MsvcRuntimeType project_msvc_runtime = msvc_last;
Condition<std::string> cmake_before;
Expand Down
79 changes: 44 additions & 35 deletions src/cmake_generator.cpp
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Expand Up @@ -725,16 +725,41 @@ void generate_cmake(const char *path, const parser::Project *parent_project) {

parser::Project project(parent_project, path, false);

for (const auto &lang : project.project_languages) {
if (known_languages.find(lang) == known_languages.end()) {
tsl::ordered_set<std::string> flat_project_languages;
for (const auto &itr : project.project_languages) {
for (const auto &language : itr.second) {
flat_project_languages.insert(language);
}
}

// Reference: https://gitlab.kitware.com/cmake/cmake/-/issues/24340#note_1304703
flat_project_languages.insert("RC");

// All acceptable extensions based off our given languages.
tsl::ordered_set<std::string> project_extensions;
for (const auto &language : flat_project_languages) {
auto itr = known_languages.find(language);
if (itr == known_languages.end()) {
if (project.project_allow_unknown_languages) {
printf("[warning] Unknown language '%s' specified\n", lang.c_str());
printf("[warning] Unknown language '%s' specified\n", language.c_str());
} else {
throw std::runtime_error("Unknown language '" + lang + "' specified");
throw std::runtime_error("Unknown language '" + language + "' specified");
}
} else {
project_extensions.insert(itr->second.begin(), itr->second.end());
}
}

auto contains_language_source = [&project_extensions](const std::vector<std::string> &sources) {
for (const auto &source : sources) {
auto extension = fs::path(source).extension().string();
if (project_extensions.count(extension) > 0) {
return true;
}
}
return false;
};

Generator gen(project, path);

// Helper lambdas for more convenient CMake generation
Expand Down Expand Up @@ -912,17 +937,29 @@ void generate_cmake(const char *path, const parser::Project *parent_project) {
gen.conditional_cmake(project.cmake_before);

if (!project.project_name.empty()) {
auto languages = std::make_pair("LANGUAGES", project.project_languages);
auto languages = std::make_pair("LANGUAGES", project.project_languages[""]);
auto version = std::make_pair("VERSION", project.project_version);
auto description = std::make_pair("DESCRIPTION", project.project_description);
cmd("project")(project.project_name, languages, version, description).endl();
cmd("project")(project.project_name, languages, version, description);

for (const auto &language : project.project_languages) {
for (const auto &language : project.project_languages[""]) {
if (language == "CSharp") {
cmd("include")("CSharpUtilities").endl();
break;
}
}

gen.handle_condition(project.project_languages, [&cmd](const std::string &condition, const std::vector<std::string> &languages) {
if (!condition.empty()) {
cmd("enable_language")(languages).endl();
for (const auto &language : languages) {
if (language == "CSharp") {
cmd("include")("CSharpUtilities").endl();
break;
}
}
}
});
}

gen.conditional_includes(project.include_after);
Expand Down Expand Up @@ -1138,34 +1175,6 @@ void generate_cmake(const char *path, const parser::Project *parent_project) {
gen.conditional_cmake(subdir.cmake_after);
}

// The implicit default is ["C", "CXX"], so make sure this list isn't
// empty or projects without languages explicitly defined will error.
auto project_languages = project.project_languages;
if (project_languages.empty())
project_languages = {"C", "CXX"};

// Reference: https://gitlab.kitware.com/cmake/cmake/-/issues/24340#note_1304703
project_languages.push_back("RC");

// All acceptable extensions based off our given languages.
tsl::ordered_set<std::string> project_extensions;
for (const auto &language : project_languages) {
auto itr = known_languages.find(language);
if (itr != known_languages.end()) {
project_extensions.insert(itr->second.begin(), itr->second.end());
}
}

auto contains_language_source = [&project_extensions](const std::vector<std::string> &sources) {
for (const auto &source : sources) {
auto extension = fs::path(source).extension().string();
if (project_extensions.count(extension) > 0) {
return true;
}
}
return false;
};

if (!project.targets.empty()) {
auto project_root = project.root();
for (size_t i = 0; i < project.targets.size(); i++) {
Expand Down
5 changes: 5 additions & 0 deletions src/project_parser.cpp
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Expand Up @@ -301,6 +301,11 @@ Project::Project(const Project *parent, const std::string &path, bool build) : p
project.required("name", project_name);
project.optional("version", project_version);
project.optional("description", project_description);

// The implicit default is ["C", "CXX"], so make sure this list isn't
// empty or projects without languages explicitly defined will error.
project_languages[""] = {"C", "CXX"};

project.optional("languages", project_languages);
project.optional("allow-unknown-languages", project_allow_unknown_languages);
project.optional("cmake-before", cmake_before);
Expand Down
9 changes: 9 additions & 0 deletions tests/CMakeLists.txt
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6 changes: 6 additions & 0 deletions tests/cmake.toml
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Expand Up @@ -65,3 +65,9 @@ name = "relative-paths"
working-directory = "relative-paths"
command = "$<TARGET_FILE:cmkr>"
arguments = ["build"]

[[test]]
name = "objective-c"
working-directory = "objective-c"
command = "$<TARGET_FILE:cmkr>"
arguments = ["build"]
13 changes: 13 additions & 0 deletions tests/objective-c/cmake.toml
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@@ -0,0 +1,13 @@
# Add Objective-C sources on Apple platforms:

[project]
name = "objective-c"
description = "Objective-C"
languages = ["C"]
apple.languages = ["OBJC"]

[target.hello]
type = "executable"
sources = ["src/main.c"]
apple.sources = ["src/apple.m"]
apple.link-libraries = ["$<LINK_LIBRARY:FRAMEWORK,Foundation>"]
7 changes: 7 additions & 0 deletions tests/objective-c/src/apple.m
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#import <Foundation/Foundation.h>

void platform_specific() {
NSFileHandle *stdout = [NSFileHandle fileHandleWithStandardOutput];
NSString *message = @"Hello from Objective-C!\n";
[stdout writeData:[message dataUsingEncoding:NSUTF8StringEncoding] error:nil];
}
14 changes: 14 additions & 0 deletions tests/objective-c/src/main.c
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#include <stdio.h>

#ifdef __APPLE__
void platform_specific();
#else
void platform_specific() {
puts("This is not an Apple platform.");
}
#endif

int main() {
platform_specific();
return 0;
}