ExtUtils::CppGuess(3p)

NAME
ExtUtils::CppGuess - guess C++ compiler and flags

SYNOPSIS
With Extutils::MakeMaker:

    use ExtUtils::CppGuess;

    my $guess = ExtUtils::CppGuess->new;

    WriteMakefile
      ( # MakeMaker args,
        $guess->makemaker_options,
        );

With Module::Build:

    my $guess = ExtUtils::CppGuess->new;

    my $build = Module::Build->new
      ( # Module::Build arguments
        $guess->module_build_options,
        );
    $build->create_build_script;

DESCRIPTION
"ExtUtils::CppGuess" attempts to guess the system's C++ compiler that is compatible with the C compiler that your perl was built with.

It can generate the necessary options to the Module::Build constructor or to ExtUtils::MakeMaker's "WriteMakefile" function.

ENVIRONMENT
As of 0.24, the environment variable "CXX" defines the obvious value, and will be used instead of any detection. Supplied arguments to "new" will still win.

METHODS

  new
Creates a new "ExtUtils::CppGuess" object. Takes the path to the C compiler as the "cc" argument, but falls back to the value of $Config{cc}, which should be what you want anyway.

You can specify "extra_compiler_flags" and "extra_linker_flags" (as strings) which will be merged in with the auto-detected ones.

  module_build_options
Returns the correct options to the constructor of "Module::Build". These are:

    extra_compiler_flags
    extra_linker_flags
    config => { cc => ... }, # as of 0.15

Please note the above may have problems on Perl <= 5.8 with ExtUtils::CBuilder <= 0.280230 due to a Perl RE issue.

  makemaker_options
Returns the correct options to the "WriteMakefile" function of "ExtUtils::MakeMaker". These are:

    CCFLAGS
    dynamic_lib => { OTHERLDFLAGS => ... }
    CC # as of 0.15

If you specify the extra compiler or linker flags in the constructor, they'll be merged into "CCFLAGS" or "OTHERLDFLAGS" respectively.

  is_gcc
Returns true if the detected compiler is in the gcc family.

  is_msvc
Returns true if the detected compiler is in the MS VC family.

  is_clang
Returns true if the detected compiler is in the Clang family.

  is_sunstudio
Returns true if the detected compiler is in the Sun Studio family.

  add_extra_compiler_flags
Takes a string as argument that is added to the string of extra compiler flags.

  add_extra_linker_flags
Takes a string as argument that is added to the string of extra linker flags.

  compiler_command
Returns the string that can be passed to "system" to execute the compiler. Will include the flags returned as the Module::Build "extra_compiler_flags".

Added in 0.13.

  linker_flags
The same as returned as the Module::Build "extra_linker_flags".

Added in 0.13.

  iostream_fname
Returns the filename to "#include" to get iostream capability.

This can be used a bit creatively to be portable in one's XS files, as the tests for this module need to be:

  # in Makefile.PL:
  $guess->add_extra_compiler_flags(
    '-DINCLUDE_DOT=' .
    ($guess->iostream_fname =~ /\./ ? 1 : 0)
  );

  // in your .xs file:
  #if INCLUDE_DOT
  #include <string.h>
  #else
  #include <string>
  #endif

Added in 0.15.

  cpp_flavor_defs
Returns the text for a header that "#define"s "__INLINE_CPP_STANDARD_HEADERS" and "__INLINE_CPP_NAMESPACE_STD" if the standard headers and namespace are available. This is determined by trying to compile C++ with "#define <iostream>" - if it succeeds, the symbols will be defined, else commented.

Added in 0.15.

  cpp_standard_flag
  $guess->cpp_standard_flag( $standard_name )

Given a string $standard_name that is currently one of

•   "C++98"

•   "C++11"

•   "C++14"

•   "C++17"

•   "C++20"

•   "C++23"

returns a string with a flag that can be used to tell the compiler to support that version of the C++ standard or dies if version is not supported.

Added in version v0.22.

AUTHOR
Mattia Barbon <mbarbon@cpan.org>

Steffen Mueller <smueller@cpan.org>

Tobias Leich <froggs@cpan.org>

COPYRIGHT AND LICENSE
Copyright 2010, 2011 by Mattia Barbon.

This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.