This repository has been archived by the owner on Aug 8, 2023. It is now read-only.
-
Notifications
You must be signed in to change notification settings - Fork 1.3k
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
[documentation] Updated README and DEVELOPING
To reflect changes in the buildsystem.
- Loading branch information
Showing
3 changed files
with
27 additions
and
211 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,168 +1,11 @@ | ||
| # Modern C++ support | ||
| # Developing | ||
|
|
||
| Mapbox GL Native supports the C++14 standard, and encourages contributions to | ||
| the source code using modern C++ idioms like return type deductions, generic | ||
| lambdas, `std::optional` and alike. However, we do not support all the features | ||
| from the final draft of the C++14 standard - we had to sacrifice support for | ||
| these features in order to support GCC from version 4.9 onwards. | ||
| This is been rewritten to include: | ||
|
|
||
| The following C++14 features are **not supported** in Mapbox GL Native: | ||
|
|
||
| ## [C++14 variable templates](https://isocpp.org/wiki/faq/cpp14-language#variable-templates) | ||
|
|
||
| Constructs like the example below are not supported: | ||
|
|
||
| ```C++ | ||
| template<typename T> constexpr T pi = T(3.14); | ||
| ``` | ||
|
|
||
| ### Workarounds: | ||
|
|
||
| - If the variable is an alias, use the call the alias points to: [example](https://github.com/mapbox/mapbox-gl-native/commit/f1ac757bd28351fd57113a1e16f6c2e00ab193c1#diff-711ce10b54a522c948efc9030ffab4fcL269) | ||
| ```C++ | ||
| // auto foo = pi<double>; | ||
| auto foo = double(3.14); | ||
| ``` | ||
|
|
||
| - Replace variable templates with either functions or structs: [example 1](https://github.com/mapbox/mapbox-gl-native/commit/f1ac757bd28351fd57113a1e16f6c2e00ab193c1#diff-ffbe6cdfd30513aaa4749b4d959a5da6L58), [example 2](https://github.com/mapbox/mapbox-gl-native/commit/f1ac757bd28351fd57113a1e16f6c2e00ab193c1#diff-04af54dc8685cdc382ebe24466dc1d00L98) | ||
|
|
||
| ## [C++14 aggregates with non-static data member initializers](http://en.cppreference.com/w/cpp/language/aggregate_initialization) | ||
|
|
||
| Constructs like the example below are not supported: | ||
|
|
||
| ```C++ | ||
| struct Foo { | ||
| int x = { 0 }; | ||
| }; | ||
|
|
||
| // error: no matching function for call to 'Foo::Foo(<brace-enclosed initializer list>)' | ||
| int main() { | ||
| Foo foo { 0 }; | ||
| return 0; | ||
| } | ||
| ``` | ||
| ### Workarounds | ||
| - Replace data member initializers with default parameter values in default constructors: | ||
| ```C++ | ||
| struct Foo { | ||
| Foo(int x_ = 0) : x(x_) {} | ||
| int x; | ||
| }; | ||
| int main() { | ||
| Foo foo { 0 }; // works with default constructor | ||
| return 0; | ||
| } | ||
| ``` | ||
|
|
||
| - Replace bracket initialization with regular round brackets or none: | ||
|
|
||
| ```C++ | ||
| struct Foo { | ||
| Foo(int x_ = 0) : x(x_) {} | ||
| int x; | ||
| }; | ||
|
|
||
| int main() { | ||
| Foo foo(); // works | ||
| Foo bar; // also works | ||
| return 0; | ||
| } | ||
| ``` | ||
| ## [Extended `constexpr` support](https://isocpp.org/wiki/faq/cpp14-language#extended-constexpr) | ||
| GCC 4.9 strictly forbids `constexpr` usage in the following scenarios: | ||
| - No local variable declarations (not `static` or `thread_local`, and no uninitialized variables) | ||
| - Cannot mutate objects whose lifetime began with the constant expression evaluation | ||
| - Disable usage of if, switch, for, while, do-while (not goto) inside constexpr expressions | ||
| - Enforces that constexpr member functions are implicitly const | ||
| ```C++ | ||
| // sorry, unimplemented: use of the value of the object being constructed | ||
| // in a constant expression | ||
| struct Foo { | ||
| int x, y; | ||
| constexpr Foo(int i) : x(i), y(x) {} | ||
| }; | ||
| // error: body of constexpr function 'constexpr int test1(int)' not a | ||
| // return-statement | ||
| constexpr int test1(int i) { | ||
| int j = i; | ||
| return j; | ||
| } | ||
| // error: body of constexpr function 'constexpr bool test2(int)' not a | ||
| // return-statement | ||
| constexpr bool test2(int i) { | ||
| if (i > 0) { | ||
| return true; | ||
| } else { | ||
| return false; | ||
| } | ||
| } | ||
| ``` | ||
|
|
||
| ### Workarounds | ||
|
|
||
| - Either remove `constexpr` specifier or replace it with `inline` in case of | ||
| functions | ||
|
|
||
|
|
||
| ## [Polymorphic lambdas](https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68278) | ||
|
|
||
| GCC 5.2.0 crashes with polymorphic lambdas and this version of the compiler | ||
| is currently used in Qt Automotive. Luckily polymorphic lambdas are rarely | ||
| used/needed but we had one incident fixed by #9665. | ||
|
|
||
| ### Workarounds | ||
|
|
||
| - Copy & Paste™ the code. | ||
|
|
||
|
|
||
| ## [Inheriting Constructors](http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2540.htm) | ||
|
|
||
| Compilers with only partial C++11 support causes compilation errors when using-declaration is used in derived class to inherit its base class's constructors `(e.g. using Base::Base;)`. | ||
|
|
||
| ```C++ | ||
| #include <vector> | ||
|
|
||
| template <typename T> | ||
| struct Varargs : std::vector<T> | ||
| { | ||
| using std::vector<T>::vector; | ||
| }; | ||
|
|
||
| // error: conflicts with version inherited from 'std::__1::vector<int, std::__1::allocator<int> >' | ||
| int main() | ||
| { | ||
| Varargs<int> v; | ||
| return 0; | ||
| } | ||
| ``` | ||
|
|
||
| ### Workarounds | ||
|
|
||
| - Replace using-declaration (e.g. using Base::Base;) in derived class with `universal forwarding constructor`. | ||
|
|
||
| ```C++ | ||
| #include <vector> | ||
|
|
||
| template <typename T> | ||
| struct Varargs : std::vector<T> | ||
| { | ||
| template <class... Args> | ||
| Varargs(Args&&... args) : std::vector<T>(std::forward<Args>(args)...) {} | ||
| }; | ||
|
|
||
| int main() | ||
| { | ||
| Varargs<int> v; | ||
| return 0; | ||
| } | ||
| ``` | ||
| Note: Using `universal forwarding constructor` may not be appropriate when derived class has additional members that are not in base class. Write constructors for the derived class explicitly instead of using `universal forwarding constructor` when the derived class has additional members. | ||
| - How to build for the platforms we support. | ||
| - Acceptance criteria for code contributions (style, static asserts) | ||
| - How to run the unit tests. | ||
| - How to run the benchmarks. | ||
| - How to run the render tests. | ||
| - How to rebaseline baselines metrics. | ||
| - How to use GL Native as a 3rd party library in your project. |
This file was deleted.
Oops, something went wrong.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,42 +1,30 @@ | ||
| # Mapbox GL Native | ||
|
|
||
| [](https://circleci.com/gh/mapbox/workflows/mapbox-gl-native/tree/master) [](https://codecov.io/gh/mapbox/mapbox-gl-native) | ||
|
|
||
| A library for embedding interactive, customizable vector maps into native applications on multiple platforms. It | ||
| takes stylesheets that conform to the [Mapbox Style Specification](https://github.com/mapbox/mapbox-gl-style-spec/), | ||
| applies them to vector tiles that conform to the [Mapbox Vector Tile Specification](https://github.com/mapbox/vector-tile-spec), | ||
| and renders them using OpenGL. [Mapbox GL JS](https://github.com/mapbox/mapbox-gl-js) is the WebGL-based counterpart, | ||
| and renders them using OpenGL or Metal. [Mapbox GL JS](https://github.com/mapbox/mapbox-gl-js) is the WebGL-based counterpart, | ||
| designed for use on the Web. | ||
|
|
||
| | SDK | Languages | Build status | | ||
| | --------------------------------------------------- | ---------------------------------- | ---------------------------------------- | | ||
| | Mapbox GL Native Core | C++14 | [](https://circleci.com/gh/mapbox/workflows/mapbox-gl-native/tree/master) [](https://codecov.io/gh/mapbox/mapbox-gl-native) | | ||
| | [Mapbox Maps SDK for Android](../platform/android/) | Java | [](https://circleci.com/gh/mapbox/workflows/mapbox-gl-native/tree/master) | | ||
| | [Mapbox Maps SDK for iOS](../platform/ios/) | Objective-C or Swift | [](https://circleci.com/gh/mapbox/workflows/mapbox-gl-native/tree/master) | | ||
| | [Mapbox Maps SDK for macOS](../platform/macos/) | Objective-C, Swift, or AppleScript | [](https://circleci.com/gh/mapbox/workflows/mapbox-gl-native/tree/master) | | ||
| | [node-mapbox-gl-native](../platform/node/) | Node.js | [](https://circleci.com/gh/mapbox/workflows/mapbox-gl-native/tree/master) | | ||
| | [Mapbox Maps SDK for Qt](../platform/qt) | C++03 | [](https://circleci.com/gh/mapbox/workflows/mapbox-gl-native/tree/master) [](https://ci.appveyor.com/project/Mapbox/mapbox-gl-native) | | ||
|
|
||
| [Additional Mapbox GL Native–based libraries](https://wiki.openstreetmap.org/wiki/Mapbox_GL#Libraries) for **hybrid applications** are developed outside of this repository. If your platform or hybrid application framework isn’t listed there, consider embedding [Mapbox GL JS](https://github.com/mapbox/mapbox-gl-js) using the standard Web capabilities on your platform. | ||
|
|
||
| ## License | ||
|
|
||
| Mapbox GL Native is licensed under the [3-Clause BSD license](../LICENSE.md). | ||
| ## [Developing](DEVELOPING.md) | ||
|
|
||
| ## Developing | ||
| We use [CMake](https://cmake.org/cmake/help/latest/) to build Mapbox GL Native | ||
| for various platforms, including Linux, Android, iOS, macOS and Windows. The | ||
| following command, executed from the root of this repository tree, will build | ||
| Mapbox GL Native targeting your host architecture given that you have all the | ||
| dependencies installed and run the example app. | ||
|
|
||
| The `next` directory contains the next generation buildsystem for Mapbox GL Native, based solely on CMake with the | ||
| goal of minimizing the use of scripts, increase portability and support building Mapbox GL Native as a subdirectory | ||
| of another CMake project. This new buildsystem is also designed to build offline, making use of pre-installed and | ||
| vendorized dependencies. When using the build bot docker image, the build should produce the exact same results as | ||
| the bots, making it a hermetically sealed build for Linux, Qt and Android. | ||
| ``` | ||
| $ git update submodules --init --recursive | ||
| $ cmake . -B build | ||
| $ cmake --build build | ||
| $ MAPBOX_ACCESS_TOKEN=my_access_token_here ./build/platform/glfw/mbgl-glfw | ||
| ``` | ||
|
|
||
| ### Building and running tests | ||
| ## License | ||
|
|
||
| The following command, executed from the root of this repository tree, will build Mapbox GL Native targeting your | ||
| host architecture given that you have all the dependencies installed. | ||
| Mapbox GL Native is licensed under the [2-Clause BSD license](LICENSE.md). The licenses of its dependencies are tracked via [FOSSA](https://app.fossa.io/projects/git%2Bhttps%3A%2F%2Fgh.neting.cc%2Fmapbox%2Fmapbox-gl-native): | ||
|
|
||
| ``` | ||
| $ mkdir build && cd build | ||
| $ cmake .. | ||
| $ make -j8 | ||
| $ make test ARGS=-V | ||
| ``` | ||
| [](https://app.fossa.io/projects/git%2Bhttps%3A%2F%2Fgh.neting.cc%2Fmapbox%2Fmapbox-gl-native) |