package SPVM::Builder::Config;

use parent 'SPVM::Builder::Config::Linker';

use strict;
use warnings;
use Config;
use Carp 'confess';
use SPVM::Builder::Util;
use SPVM::Builder::Config::Util;

use SPVM::Builder::Accessor 'has';

# Fields
my $cc_fields = [qw(
  cc
  ccflags
  defines
  optimize
  language
  dialect
  std
  ext
  include_dirs
  source_files
  spvm_core_include_dir
  resource_include_dirs
  cc_output_option_name
  copyright_print_ccflags
  cc_input_dir
  language_ccflags
  arch_ccflags
  warn_ccflags
  debug_info_ccflags
  source_encoding_ccflags
  function_level_linking_ccflags
  cpp_exception_handling_ccflags
  library_linkage_ccflags
  position_independent_code_ccflags
  thread_ccflags
  extra_ccflags
  ndebug_ccflags
  before_compile_cbs
  cc_version
)];

has($cc_fields);

sub option_names {
  my ($self) = @_;
  
  return [@{$self->SUPER::option_names}, @$cc_fields];
}

# Class Methods
sub new {
  my $class = shift;
  
  my $self = $class->SUPER::new(@_);
  
  # ccflags
  unless (exists $self->{ccflags}) {
    $self->ccflags([]);
  }
  
  # defines
  unless (exists $self->{defines}) {
    $self->defines([]);
  }

  # position_independent_code_ccflags
  unless (exists $self->{position_independent_code_ccflags}) {
    if (SPVM::Builder::Util::is_windows()) {
      $self->position_independent_code_ccflags([]);
    }
    else {
      $self->position_independent_code_ccflags(['-fPIC']);
    }
  }

  # thread_ccflags
  unless (exists $self->{thread_ccflags}) {
    $self->thread_ccflags(['-pthread']);
  }
  
  # extra_ccflags
  unless (exists $self->{extra_ccflags}) {
    $self->extra_ccflags([]);
  }
  
  # ndebug_ccflags
  unless (exists $self->{ndebug_ccflags}) {
    $self->ndebug_ccflags(['-DNDEBUG']);
  }

  # optimize
  unless (exists $self->{optimize}) {
    $self->optimize('-O3');
  }

  # include_dirs
  unless (exists $self->{include_dirs}) {
    $self->include_dirs([]);
  }

  # spvm_core_include_dir
  unless (exists $self->{spvm_core_include_dir}) {
    my $builder_dir = SPVM::Builder::Util::get_builder_dir();
    my $spvm_core_include_dir = "$builder_dir/include";
    
    $self->spvm_core_include_dir($spvm_core_include_dir);
  }

  # resource_include_dirs
  unless (exists $self->{resource_include_dirs}) {
    $self->resource_include_dirs([]);
  }

  # source_files
  unless (exists $self->{source_files}) {
    $self->source_files([]);
  }

  # before_compile_cbs
  unless (exists $self->{before_compile_cbs}) {
    $self->before_compile_cbs([]);
  }

  # copyright_print_ccflags
  unless (exists $self->{copyright_print_ccflags}) {
    $self->copyright_print_ccflags([]);
  }

  # language_ccflags
  unless (exists $self->{language_ccflags}) {
    $self->language_ccflags([]);
  }

  # arch_ccflags
  unless (exists $self->{arch_ccflags}) {
    $self->arch_ccflags([]);
  }
  
  # warn_ccflags
  unless (exists $self->{warn_ccflags}) {
    $self->warn_ccflags([]);
  }
  
  # debug_info_ccflags
  unless (exists $self->{debug_info_ccflags}) {
    $self->debug_info_ccflags([]);
  }
  
  # source_encoding_ccflags
  unless (exists $self->{source_encoding_ccflags}) {
    $self->source_encoding_ccflags([]);
  }
  
  # function_level_linking_ccflags
  unless (exists $self->{function_level_linking_ccflags}) {
    $self->function_level_linking_ccflags([]);
  }

  # cpp_exception_handling_ccflags
  unless (exists $self->{cpp_exception_handling_ccflags}) {
    if (SPVM::Builder::Util::is_windows()) {
      $self->cpp_exception_handling_ccflags(['-D__USE_MINGW_ANSI_STDIO']);
    }
    else {
      $self->cpp_exception_handling_ccflags([]);
    }
  }

  # library_linkage_ccflags
  unless (exists $self->{library_linkage_ccflags}) {
    $self->library_linkage_ccflags([]);
  }

  # cc_output_option_name
  unless (exists $self->{cc_output_option_name}) {
    $self->cc_output_option_name("-o");
  }
  
  return $self;
}

sub new_c {
  my $class = shift;
  
  my $self = $class->new(@_);
  
  # C compiler
  my $config_gcc_version = $Config{gccversion};
  if ($config_gcc_version =~ /\bclang\b/i) {
    $self->cc('clang');
  }
  else {
    $self->cc('gcc');
  }
  
  $self->language('c');
  
  $self->ext('c');
  
  unless (exists $self->{cc_version}) {
    $self->cc_version($self->create_cc_version);
  }
  
  return $self;
}

sub new_c99 {
  my $class = shift;
  
  my $self = $class->new_c(@_);
  
  # C99
  $self->std('c99');
  
  return $self;
}

sub new_c11 {
  my $class = shift;
  
  my $self = $class->new_c(@_);
  
  # C11
  $self->std('c11');
  
  return $self;
}

sub new_cpp {
  my $class = shift;
  
  my $self = $class->new(@_);
  
  # C++ compiler
  my $config_gcc_version = $Config{gccversion};
  if ($config_gcc_version =~ /\bclang\b/i) {
    $self->cc('clang++');
  }
  else {
    $self->cc('g++');
  }
  
  $self->language('cpp');
  
  $self->ext('cpp');
  
  unless (exists $self->{cc_version}) {
    $self->cc_version($self->create_cc_version);
  }
  
  return $self;
}

sub new_cpp11 {
  my $class = shift;
  
  my $self = $class->new_cpp(@_);
  
  # C++11
  $self->std('c++11');
  
  return $self;
}

sub new_cpp14 {
  my $class = shift;
  
  my $self = $class->new_cpp(@_);
  
  # C++14
  $self->std('c++14');
  
  return $self;
}

sub new_cpp17 {
  my $class = shift;
  
  my $self = $class->new_cpp(@_);
  
  # C++17
  $self->std('c++17');
  
  return $self;
}

# Instance Methods
sub add_ccflag {
  my ($self, @ccflags) = @_;
  
  push @{$self->{ccflags}}, @ccflags;
}

sub add_define {
  my ($self, @defines) = @_;
  
  push @{$self->{defines}}, @defines;
}

sub add_include_dir {
  my ($self, @include_dirs) = @_;
  
  push @{$self->{include_dirs}}, @include_dirs;
}

sub add_source_file {
  my ($self, @source_files) = @_;
  
  push @{$self->{source_files}}, @source_files;
}

sub add_before_compile_cb {
  my ($self, @before_compile_cbs) = @_;
  
  push @{$self->{before_compile_cbs}}, @before_compile_cbs;
}

sub get_cc_system_field_names {
  my $self = shift;
  
  return [qw(
    position_independent_code_ccflags
    thread_ccflags
    extra_ccflags
    ndebug_ccflags
    copyright_print_ccflags
    language_ccflags
    arch_ccflags
    warn_ccflags
    debug_info_ccflags
    source_encoding_ccflags
    function_level_linking_ccflags
    cpp_exception_handling_ccflags
    library_linkage_ccflags
  )];
}

sub clear_system_fields {
  my $self = shift;
  
  $self->SUPER::clear_system_fields;
  
  my $field_names = $self->get_cc_system_field_names;
  
  for my $field_name (@$field_names) {
    $self->$field_name([]);
  }
}

my %CC_VERSION_CACHE;

sub create_cc_version {
  my ($self) = @_;
  
  my $cc = $self->cc;
  my $path_env = $ENV{PATH} // '';
  
  if (exists $CC_VERSION_CACHE{$cc}{$path_env}) {
    return $CC_VERSION_CACHE{$cc}{$path_env};
  }
  
  my $cc_version = `$cc --version 2>&1` // '';
  
  $cc_version =~ s/\n.*//s;
  
  $CC_VERSION_CACHE{$cc}{$path_env} = $cc_version;
  
  return $cc_version;
}

sub native_include_dir {
  my ($self) = @_;
  
  my $config_file = $self->file;
  
  unless (defined $config_file) {
    return;
  }
  
  my $native_dir = SPVM::Builder::Config::Util::remove_ext_from_config_file($config_file);
  $native_dir .= '.native';
  my $native_include_dir = "$native_dir/include";
  
  return $native_include_dir;
}

sub native_src_dir {
  my ($self) = @_;
  
  my $config_file = $self->file;
  
  unless (defined $config_file) {
    return;
  }
  
  my $native_dir = SPVM::Builder::Config::Util::remove_ext_from_config_file($config_file);
  $native_dir .= '.native';
  my $native_src_dir = "$native_dir/src";
  
  return $native_src_dir;
}

1;

=head1 Name

SPVM::Builder::Config - Config for Compiling and Linking Native Classes

=head1 Description

L<SPVM::Builder::Config> is a class to manage the configurations for compiling and linking native classes (C, C++, etc.).

An instance of this class holds compiler settings (managed by L<SPVM::Builder::Config> itself), linker and resource settings (inherited from L<SPVM::Builder::Config::Linker>), and configuration loading and common settings (inherited from L<SPVM::Builder::Config::Base>).

Within a configuration file (C<.config>), you can customize the build environment by accessing methods from all of these hierarchical levels.=head1 Usage

  use SPVM::Builder::Config;
  
  # Create a config
  my $config = SPVM::Builder::Config->new;
  
  # C99
  my $config = SPVM::Builder::Config->new_c99;
  
  # C++
  my $config = SPVM::Builder::Config->new_cpp;
  
  # C++11
  my $config = SPVM::Builder::Config->new_cpp11;
  
  # C++17
  my $config = SPVM::Builder::Config->new_cpp17;
  
  # Optimize
  $config->optimize("-O2");
  
  # Optimize with debug mode
  $config->optimize("-O0 -g");
  
  # Add ccflags
  $config->add_ccflag("-DFOO");
  
  $config->add_define("FOO");
  
  # Add source files
  $config->add_source_file("foo.c", "bar.c", "baz/baz.c");
  
  # Add libraries
  $config->add_lib("gdi32", "d2d1", "Dwrite");
  
  # Add ldflags
  $config->add_ldflag("-pthread");
  
  # Use resource
  $config->use_resource("Resource::MyResource");

=head1 Inheritance

L<SPVM::Builder::Config::Linker>

=head2 Class Hierarchy

=over 2

=item 1. L<SPVM::Builder::Config::Base>

The base class for all configuration classes. It provides the "loading configuration files" mechanism and manages common settings shared across all build phases, such as C<class_name>, and C<quiet>.

=item 2. L<SPVM::Builder::Config::Linker>

This class manages settings for "linking" (converting object files to shared libraries or executables) and "resource management". Fields like C<ld>, C<libs>, C<ldflags>, and C<resources> are defined in this class. Inherits L<SPVM::Builder::Config::Base>.

=item 3. L<SPVM::Builder::Config>

This class primarily manages settings for "compilation" (converting C/C++ source files to object files). Inherits L<SPVM::Builder::Config::Linker> and L<SPVM::Builder::Config::Base>.

=back

=head1 Fields

=head2 ext

  my $ext = $config->ext;
  $config->ext($ext);

Gets and sets C<ext> field, the extension of a native class.

Examples:

  # MyClass.c
  $config->ext('c');
  
  # MyClass.cpp
  $config->ext('cpp');
  
  # MyClass.cc
  $config->ext('cc');
  
  # MyClass.cu
  $config->ext('cu');
  
  # MyClass.m
  $config->ext('m');

=head2 cc

  my $cc = $config->cc;
  $config->cc($cc);

Gets and sets C<cc> field, a compiler name.

Examples:
  
  # gcc
  $config->cc('gcc');
  
  # g++ for C++
  $config->cc('g++');
  
  # nvcc for CUDA/GUP
  $config->cc('nvcc');
  
=head2 include_dirs

  my $include_dirs = $config->include_dirs;
  $config->include_dirs($include_dirs);

Gets and sets C<include_dirs> field, an array reference containing header file search directories.

The values of this field are converted to C<-I> options when the arguments of the compiler L</"cc"> are created.

  # -I /path1 -I /path2
  $config->include_dirs(['/path1', '/path2']);

=head2 spvm_core_include_dir

  my $spvm_core_include_dir = $config->spvm_core_include_dir;
  $config->spvm_core_include_dir($spvm_core_include_dir);

Gets and sets C<spvm_core_include_dir> field, an SPVM core header file search directory.

The value of this field is converted to C<-I> option when the arguments of the compiler L</"cc"> are created.

=head2 resource_include_dirs

  my $resource_include_dirs = $config->resource_include_dirs;
  $config->resource_include_dirs($resource_include_dirs);

Gets and sets C<resource_include_dirs> field, an SPVM resource header files search directory.

The value of this field is converted to C<-I> option when the arguments of the compiler L</"cc"> are created.

=head2 ccflags

  my $ccflags = $config->ccflags;
  $config->ccflags($ccflags);

Gets and sets C<ccflags> field, an array reference containing arugments of the compiler L</"cc">.

=head2 defines

  my $defines = $config->defines;
  $config->defines($defines);

Gets and sets C<defines> field, an array reference containing the values of C<-D> arugments of the compiler L</"cc">.

=head2 cc_version

  my $cc_version = $config->cc_version;
  $config->cc_version($cc_version);

Gets and sets C<cc_version> field, the compiler version to be used for the build cache digest.

=head2 optimize

  my $optimize = $config->optimize;
  $config->optimize($optimize);

Gets and sets C<optimize> field, an arugment of the compiler L</"cc"> for optimization.

Examples:

  $config->optimize('-O3 -DNDEBUG');
  $config->optimize('-O2');
  $config->optimize('-g -O0');

=head2 position_independent_code_ccflags

  my $flags = $config->position_independent_code_ccflags;
  $config->position_independent_code_ccflags(['-fPIC']);

Gets or sets the compiler flags required to generate Position Independent Code (PIC). 
This is typically an array reference containing flags like C<-fPIC>, which are 
necessary for building libraries intended for dynamic linking.

=cut

=head2 thread_ccflags

  my $thread_ccflags = $config->thread_ccflags;
  $config->thread_ccflags($thread_ccflags);

Gets and sets C<thread_ccflags> field, an array reference containing arugments of the compiler L</"cc"> for threads.

=head2 extra_ccflags

  my $extra_ccflags = $config->extra_ccflags;
  $config->extra_ccflags(['-Wno-unused-variable']);

Gets and sets C<extra_ccflags> field, an array reference containing extra arguments of the compiler L</"cc">.

=head2 ndebug_ccflags

  my $ndebug_ccflags = $config->ndebug_ccflags;
  $config->ndebug_ccflags(['-DNDEBUG']);

Gets and sets C<ndebug_ccflags> field, an array reference containing compiler flags to deactivate debug features like C<assert>. 
This field is typically used to provide C<-DNDEBUG> for production builds.

=head2 std

  my $std = $config->std;
  $config->std($std);

Gets and sets C<std> field, a language standard.

This field is converted to C<-std> option when the arguments of the compiler L</"cc"> are created.

Examples:
  
  # -std=c99
  $config->std('c99');
  
  # -std=cpp
  $config->std('cpp');
  
  # -std=cpp11
  $config->std('cpp11');
  
  # -std=cpp17
  $config->std('cpp17');

=head2 source_files

  my $source_files = $config->source_files;
  $config->source_files($source_files);

Gets and sets C<source_files> field, an array reference containing relative paths of L<native source file|SPVM::Document::NativeClass/"Native Source Files"> file from C<src> directory.

=head2 before_compile_cbs

  my $before_compile_cbs = $config->before_compile_cbs;
  $config->before_compile_cbs($before_compile_cbs);

Gets and sets C<before_compile_cbs> field, an array reference containing callbacks called just before the compile command L</"cc"> is executed.

These callbacks are executed only if an object file is actually generated.

The 1th argument of the callback is an L<SPVM::Builder::Config> object.

The 2th argument of the callback is an L<SPVM::Builder::CompileInfo> object.

=head2 cc_input_dir

  my $cc_input_dir = $config->cc_input_dir;
  $config->cc_input_dir($cc_input_dir);

Gets and sets C<cc_input_dir> field, an input directory for the compiler L</"cc">.

=head2 language

  my $language = $config->language;
  $config->language($language);

Gets and sets the C<language> field.

The language of the source files.

One of the following languages can be specified:

=over 2

=item * C<c>

C language

=item * C<cpp>

C++ language

=back

=head2 dialect

  my $dialect = $config->dialect;
  $config->dialect($dialect);

Gets and sets the C<dialect> field.

The dialect of the language.

You can specify any dialect name, but the following names are reserved for specific compilers or toolchains:

Each unit of a dialect name must consist of lowercase alphanumeric characters (C<a-z0-9>).

Multiple units can be combined using a hyphen (C<->) to represent sub-dialects, such as C<arduino-avr>, C<esp32-s3>, or C<cuda-sm80>.

You can specify any dialect name, but the following names are reserved for specific compilers or toolchains:

=over 2

=item * C Based Dialects

=over 4

=item * Languages

=over 6

=item * C<objc>

Objective-C language

=back

=item * Shaders

=over 6

=item * C<glsl>

Vulkan/OpenGL Shading Language. (Requires C<glslc>)

=back

=item * Microcontrollers

=over 6

=item * C<arduino>

Arduino dialect. Requires C<avr-gcc> or C<arm-none-eabi-gcc>.

=item * C<esp32>

ESP32 specific dialect. Requires C<xtensa-esp32-elf-gcc>.

=item * C<pic>

Microchip PIC dialect. Requires C<xc8>, C<xc16>, or C<xc32>.

=item * C<avr>

Raw AVR dialect. Requires C<avr-gcc>.

=back

=back

=item * C++ Based Dialects

=over 4

=item * Languages

=over 6

=item * C<objcpp>

Objective-C++ language

=back

=item * Shaders

=over 6

=item * C<metal> - Apple Metal Shading Language. (Based on C++14. Requires C<metal> compiler)

=back

=item * GPU Computing

=over 6

=item * C<cuda> - NVIDIA CUDA dialect. (Requires C<nvcc>)

=item * C<hip> - AMD ROCm HIP dialect. (Requires C<hipcc>)

=item * C<sycl> - SYCL dialect for heterogeneous computing. (Requires C<dpc++>)

=back

=item * Hardware Logic Design (FPGA)

=over 6

=item * C<hls> - High-Level Synthesis dialect. (Usually based on C++. Requires C<v++>)

=back

=back

=back

=head2 copyright_print_ccflags

  my $copyright_print_ccflags = $config->copyright_print_ccflags;
  $config->copyright_print_ccflags(['-nologo']);

Gets and sets the C<copyright_print_ccflags> field, an array reference containing compiler arguments to control the printing of the copyright banner or logo (e.g., C<-nologo> in MSVC).

=head2 language_ccflags

  my $language_ccflags = $config->language_ccflags;
  $config->language_ccflags($language_ccflags);

Gets and sets C<language_ccflags> field, an array reference containing arguments of the compiler L</"cc"> for language.

=head2 arch_ccflags

  my $arch_ccflags = $config->arch_ccflags;
  $config->arch_ccflags($arch_ccflags);

Gets and sets C<arch_ccflags> field, an array reference containing arguments of the compiler L</"cc"> for CPU architecture or host environment.

=head2 warn_ccflags

  my $warn_ccflags = $config->warn_ccflags;
  $config->warn_ccflags(['-Wall', '-Wextra']);

Gets and sets the C<warn_ccflags> field, an array reference containing compiler arguments for warning settings.

=head2 debug_info_ccflags

  my $debug_info_ccflags = $config->debug_info_ccflags;
  $config->debug_info_ccflags(['-g']);

Gets and sets the C<debug_info_ccflags> field, an array reference containing compiler arguments for generating debug information.

=head2 source_encoding_ccflags

  my $source_encoding_ccflags = $config->source_encoding_ccflags;
  $config->source_encoding_ccflags(['-finput-charset=UTF-8']);

Gets and sets the C<source_encoding_ccflags> field, an array reference containing compiler arguments for source file encoding settings.

=head2 function_level_linking_ccflags

  my $function_level_linking_ccflags = $config->function_level_linking_ccflags;
  $config->function_level_linking_ccflags(['-Gy']);

Gets and sets the C<function_level_linking_ccflags> field, an array reference containing compiler arguments to enable function-level linking (e.g., C<-Gy> in MSVC).

This allows the linker to optimize the executable size by removing unreferenced functions.

=head2 cpp_exception_handling

  my $cpp_exception_handling = $config->cpp_exception_handling;
  $config->cpp_exception_handling(1);

Gets and sets the C<cpp_exception_handling> field, a boolean value that indicates whether C++ exception handling is enabled.

If this value is true, the compiler is configured to support C++ exceptions (e.g., C<-EHsc> in MSVC, C<-fexceptions> in GCC). 
Defaults to undef.

=head2 library_linkage_ccflags

  my $library_linkage_ccflags = $config->library_linkage_ccflags;
  $config->library_linkage_ccflags(['-MT']);

Gets and sets the C<library_linkage_ccflags> field, an array reference containing compiler arguments to specify the library linkage (e.g., static or dynamic linking).

These flags are passed to the compiler L</"cc"> to determine how libraries (such as the C runtime library) are linked. For example, C<-MT> or C<-MD> in MSVC.

=head2 cc_output_option_name

  my $cc_output_option_name = $config->cc_output_option_name;
  $config->cc_output_option_name($cc_output_option_name);

Gets and sets C<cc_output_option_name> field, a string that is an option name to specify a compiler output file name.

=head1 Class Methods

=head2 new

  my $config = SPVM::Builder::Config->new(%fields);

Creates a new C<SPVM::Builder::Config> object. This method calls the C<new> method of the super class L<SPVM::Builder::Config::Linker>.

Default settings for the GCC or Clang compiler are performed.

Field Default Values:

=over 2

=item * L</"cc">

  undef

=item * L</"ccflags">

  []

=item * L</"defines">

  []

=item * L</"cc_version">

  The return value of L</"create_cc_version">.

=item * L</"optimize">

  "-O3"

=item * L</"copyright_print_ccflags">

  []

=item * L</"language_ccflags">

  []

=item * L</"arch_ccflags">

  []

=item * L</"warn_ccflags">

  []

=item * L</"debug_info_ccflags">

  []

=item * L</"source_encoding_ccflags">

  []

=item * L</"function_level_linking_ccflags">

  []

=item * L</"cpp_exception_handling_ccflags">

Windows:

  ['-D__USE_MINGW_ANSI_STDIO']

Other OSs:

  []

=item * L</"library_linkage_ccflags">

  []

=item * L</"position_independent_code_ccflags">

Windows:

  []

Other OSs:

  ["-fPIC"]

=item * L</"thread_ccflags">

  ["-pthread"]

=item * L</"extra_ccflags">

  []

=item * L</"ndebug_ccflags">

  ["-DNDEBUG"]

=item * L</"include_dirs">

  []

=item * L</"spvm_core_include_dir">

The SPVM core header file search directory.

=item * L</"resource_include_dirs">

  []

=item * L</"native_include_dir">

The directory described in L<SPVM::Document::NativeClass/"Native Header Files">.

=item * L</"source_files">

  []

=item * L</"before_compile_cbs">

  []

=item * L</"cc_output_option_name">

"-o"

=back

=cut

=head2 new_c

  my $config = SPVM::Builder::Config->new_c;

Calls L</"new"> method and sets L</"ext"> field to C<c>, L</"language"> field to C<c>, L</"cc"> field to a C++ compiler, and returns the return value of L</"new"> method.

=head2 new_c99
  
  my $config = SPVM::Builder::Config->new_c99;

Calls L</"new_c"> method and sets L</"std"> field to C<c99>, and returns the return value of L</"new_c"> method.

=head2 new_c11
  
  my $config = SPVM::Builder::Config->new_c11;

Calls L</"new_c"> method and sets L</"std"> field to C<c11>, and returns the return value of L</"new_c"> method.

=head2 new_cpp

  my $config = SPVM::Builder::Config->new_cpp;

Calls L</"new"> method and sets L</"ext"> field to C<cpp>, L</"language"> field to C<cpp>, L</"cc"> field to a C++ compiler, and L</"ld"> field to a C++ linker, and returns the return value of L</"new"> method.

If C<$Config{gccversion}> contains C<clang>, L</"cc"> field and L</"ld"> field are set to C<clang++>. Otherwise, L</"cc"> field and L</"ld"> field are set to C<g++>.

=head2 new_cpp11
  
  my $config = SPVM::Builder::Config->new_cpp11;

Calls L</"new_cpp"> method and sets L</"std"> field to C<c++11>, and returns the return value of L</"new_cpp"> method.

=head2 new_cpp14
  
  my $config = SPVM::Builder::Config->new_cpp14;

Calls L</"new_cpp"> method and sets L</"std"> field to C<c++14>, and returns the return value of L</"new_cpp"> method.

=head2 new_cpp17
  
  my $config = SPVM::Builder::Config->new_cpp17;

Calls L</"new_cpp"> method and sets L</"std"> field to C<c++17>, and returns the return value of L</"new_cpp"> method.

=head1 Instance Methods

=head2 add_ccflag

  $config->add_ccflag(@ccflags);

Adds @ccflags to the end of L</"ccflags"> field.

=head2 add_define

  $config->add_define(@defines);

Adds @defines to the end of L</"defines"> field.

=head2 add_include_dir

  $config->add_include_dir(@include_dirs);

Adds @include_dirs to the end of L</"include_dirs"> field.

=head2 add_source_file

  $config->add_source_file(@source_files);

Adds @source_files to the end of L</"source_files"> field.

Examples:

  $config->add_source_file('foo.c', 'bar.c');

=head2 add_before_compile_cb

  $config->add_before_compile_cb(@before_compile_cbs);

Adds @before_compile_cbs to the end of L</"before_compile_cbs"> field.

Examples:

  $config->add_before_compile_cb(sub {
    my ($config, $compile_info) = @_;
    
    my $cc_command = $compile_info->to_command;
    
    # Do something
  });

=head2 clear_system_fields

  $config->clear_system_fields;

Clears the fields that are set by default for a specific environment.

These fields might be updated in the future to support appropriate settings for different environments.

This method calls the L<clear_system_fields|SPVM::Builder::Config::Linker/"clear_system_fields"> method of the L<SPVM::Builder::Config::Linker> class to clear linker settings.

Then it clears the compiler settings whose field names are returned by the L<get_cc_system_field_names|/"get_cc_system_field_names"> method by setting them to C<[]>.

=cut

=head2 get_cc_system_field_names

  my $field_names = $config->get_cc_system_field_names;

Returns the field names of the compiler settings that are set by default for a specific environment.

These fields might be updated in the future to support appropriate settings for different environments.

The field names returned by this method are used by the L<clear_system_fields|/"clear_system_fields"> method to clear the compiler settings.

The following field names are returned:

=over 2

=item * C<position_independent_code_ccflags>

=item * C<thread_ccflags>

=item * C<extra_ccflags>

=item * C<ndebug_ccflags>

=item * C<copyright_print_ccflags>

=item * C<language_ccflags>

=item * C<arch_ccflags>

=item * C<warn_ccflags>

=item * C<debug_info_ccflags>

=item * C<source_encoding_ccflags>

=item * C<function_level_linking_ccflags>

=item * C<cpp_exception_handling_ccflags>

=item * C<library_linkage_ccflags>

=back

=cut

=head2 create_cc_version

  my $cc_version = $config->create_cc_version;

Executes the compiler defined in L</"cc"> with the C<--version> option and returns the output.

The return value contains the compiler command itself and its version information (the first line of the output). 

If the execution fails, an empty string is returned.

This information is intended to be used as a part of the digest for the build cache.

=head2 native_include_dir

  my $native_include_dir = $config->native_include_dir;
  $config->native_include_dir($native_include_dir);

Creates the path of C<include> header directory for the native class.

=head2 native_src_dir

  my $native_src_dir = $config->native_src_dir;
  $config->native_src_dir($native_src_dir);

Creates the path of C<src> source directory for the native class.

=head1 Copyright & License

Copyright (c) 2023 Yuki Kimoto

MIT License