meson.build

# This file is part of glibmm.

project('glibmm', 'cpp',
  version: '2.82.0',
  license: 'LGPLv2.1+',
  default_options: [
    'cpp_std=c++17',
    'warning_level=1',
  ],
  meson_version: '>= 0.62.0', # required for variables in pkgconfig.generate()
)

glibmm_api_version = '2.68'
glibmm_pcname = '@0@-@1@'.format(meson.project_name(), glibmm_api_version)
giomm_pcname = 'giomm-@0@'.format(glibmm_api_version)

glibmm_version_array = meson.project_version().split('.')
glibmm_major_version = glibmm_version_array[0].to_int()
glibmm_minor_version = glibmm_version_array[1].to_int()
glibmm_micro_version = glibmm_version_array[2].to_int()

# http://www.gnu.org/software/libtool/manual/html_node/Updating-version-info.html
# The relation between libtool's current:revison:age interface versioning
# and the .so filename, .so.x.y.z, is
# x = current - age
# y = age
# z = revision
# If libtool_soversion is updated as described in libtool's documentation,
# x.y.z will usually *not* be equal to meson.project_version().
libtool_soversion = [4, 0, 3]
glibmm_libversion = '@0@.@1@.@2@'.format(
  libtool_soversion[0] - libtool_soversion[2],
  libtool_soversion[2],
  libtool_soversion[1]
)
macos_darwin_versions = [
  libtool_soversion[0] + 1,
  '@0@.@1@'.format(libtool_soversion[0] + 1, libtool_soversion[1])
]

# Use these instead of meson.source_root() and meson.build_root() in subdirectories.
# source_root() and build_root() are not useful, if this is a subproject.
project_source_root = meson.current_source_dir()
project_build_root = meson.current_build_dir()

cpp_compiler = meson.get_compiler('cpp')
is_msvc = cpp_compiler.get_id() == 'msvc'
is_host_windows = host_machine.system() == 'windows'
is_os_cocoa = host_machine.system() == 'darwin'

python3 = find_program('python3', version: '>=3.7')
pkgconfig = import('pkgconfig')
common_pkgconfig_vars = [
  'doxytagfile=${docdir}/reference/@0@.tag'.format(glibmm_pcname),
  'htmlrefdir=${docdir}/reference/html',
  'htmlrefpub=https://gnome.pages.gitlab.gnome.org/@0@/'.format(meson.project_name()),
]
base_pkgconfig_vars = [
  'exec_prefix=${prefix}',
  'datarootdir=${datadir}',
  'docdir=${datadir}/doc/@0@'.format(glibmm_pcname),
] + common_pkgconfig_vars
base_pkgconfig_uninstalled_vars = [
  'docdir=${prefix}/docs',
] + common_pkgconfig_vars

# Do we build from a git repository?
# Suppose we do if and only if the meson.build file is tracked by git.
cmd_py = '''
import shutil, subprocess, sys
git_exe = shutil.which('git')
if not git_exe:
  sys.exit(1)
cmd = [ git_exe, 'ls-files', '--error-unmatch', 'meson.build' ]
sys.exit(subprocess.run(cmd, cwd=sys.argv[1], stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL).returncode)
'''
is_git_build = run_command(
  python3, '-c', cmd_py,
  project_source_root,
  check: false,
).returncode() == 0

# Are we testing a dist tarball while it's being built?
# There ought to be a better way. https://github.com/mesonbuild/meson/issues/6866
is_dist_check = project_source_root.contains('dist-unpack') and \
                project_build_root.contains('dist-build')

# Options.
maintainer_mode_opt = get_option('maintainer-mode')
maintainer_mode = maintainer_mode_opt == 'true' or \
                 (maintainer_mode_opt == 'if-git-build' and is_git_build)
if is_dist_check
  message('Looks like a tarball is being tested. ' + \
          'Option "dist-warnings" is used instead of "warnings".')
  cpp_warnings = get_option('dist-warnings')
else
  cpp_warnings = get_option('warnings')
endif
if get_option('warning_level') in ['0','1','2','3','4','5']
  warning_level = get_option('warning_level').to_int()
else
  # For instance get_option('warning_level') == 'everything'
  warning_level = 99
endif
werror = get_option('werror')
build_deprecated_api = get_option('build-deprecated-api')
build_documentation_opt = get_option('build-documentation')
build_documentation = build_documentation_opt == 'true' or \
                     (build_documentation_opt == 'if-maintainer-mode' and maintainer_mode)
build_examples = get_option('build-examples')

use_msvc14x_toolset_ver = get_option('msvc14x-parallel-installable')

# Installation directories are relative to {prefix}.
install_prefix = get_option('prefix')
install_includedir = get_option('includedir')
install_libdir = get_option('libdir')
install_datadir = get_option('datadir')
install_pkgconfigdir = install_libdir / 'pkgconfig'

# Dependencies. <pkg> = glib and gio
# <pkg>mm_build_dep: Dependencies when building the <pkg>mm library.
# <pkg>mm_dep (created in <pkg>/<pkg>mm/meson.build):
#   Dependencies when using the <pkg>mm library.

sigcxx_req = '>= 3.0.0'
glib_req = '>= 2.81.0'

# There are pkg-config files for sigc++ and glib on MSVC, so just use that.
sigcxx_dep = dependency('sigc++-3.0', version: sigcxx_req)
glib_dep = dependency('glib-2.0', version: glib_req)
gobject_dep = dependency('gobject-2.0', version: glib_req)
gmodule_dep = dependency('gmodule-2.0', version: glib_req)

glibmm_build_dep = [sigcxx_dep, glib_dep, gobject_dep, gmodule_dep]

gio_dep = dependency('gio-2.0', version: glib_req)
giomm_build_dep = glibmm_build_dep + [gio_dep]
if not is_host_windows
  gio_unix_dep = dependency('gio-unix-2.0', version: glib_req)
  giomm_build_dep += gio_unix_dep
endif

# Some dependencies are required only in maintainer mode and/or if
# reference documentation shall be built.
mm_common_get = find_program('mm-common-get', required: false)
if maintainer_mode and not mm_common_get.found()
  message('Maintainer mode requires the \'mm-common-get\' command. If it is not found,\n' +
          'install the \'mm-common\' package, version 1.0.0 or higher.')
  # If meson --wrap-mode != forcefallback, Meson falls back to the mm-common
  # subproject only if mm-common-get is required.
  mm_common_get = find_program('mm-common-get', required: true)
endif
m4 = find_program('m4', required: maintainer_mode) # Used by gmmproc
doxygen = find_program('doxygen', required: build_documentation)
dot = find_program('dot', required: build_documentation) # Used by Doxygen
xsltproc = find_program('xsltproc', required: build_documentation)

# Where to find gmmproc and generate_wrap_init.pl.
gmmproc_dir = project_build_root / 'tools'

# Script files copied to 'untracked' by mm-common-get.
script_dir = project_source_root / 'untracked' / 'build_scripts'
generate_binding_py = script_dir / 'generate-binding.py'
doc_reference_py = script_dir / 'doc-reference.py'
dist_changelog_py = script_dir / 'dist-changelog.py'
dist_build_scripts_py = script_dir / 'dist-build-scripts.py'

if maintainer_mode
  # Copy files to untracked/build_scripts and untracked/docs.
  run_command(mm_common_get, '--force', script_dir,
    project_source_root / 'untracked' / 'docs',
    check: true,
  )
elif not import('fs').is_file(generate_binding_py)
  error('Missing files in untracked/. You must enable maintainer-mode.')
endif

# Check if perl is required and available.
doc_perl_prop = run_command(
  python3, doc_reference_py, 'get_script_property',
  '', # MMDOCTOOLDIR is not used
  'requires_perl',
  check: false,
)
doc_requires_perl = true
if doc_perl_prop.returncode() == 0 and doc_perl_prop.stdout() == 'false'
  doc_requires_perl = false
endif

perl = find_program('perl', required: maintainer_mode or \
  (build_documentation and doc_requires_perl))

# glibmm's own script files.
glibmm_script_dir = project_source_root / 'tools' / 'build_scripts'
handle_built_files_py = glibmm_script_dir / 'handle-built-files.py'
dummy_header_py = glibmm_script_dir / 'dummy-header.py'
compile_schemas_py = glibmm_script_dir / 'compile-schemas.py'

# Set compiler warnings.
# Meson warns if any of the /W1, /W2, /W3, /W4, /Wall, -Wall, -Wextra, -Werror
# compiler options are added with add_project_arguments().
# Avoid such warnings, when possible.
# See _warn_about_builtin_args() in meson/mesonbuild/interpreter/interpreter.py.
warning_flags = []
if cpp_warnings == 'min'
  if warning_level == 0
    warning_flags = is_msvc ? ['/W2'] : ['-Wall']
  endif
elif cpp_warnings == 'max' or cpp_warnings == 'fatal'
  if warning_level < 3
    warning_flags = is_msvc ? ['/W4'] : ['-pedantic', '-Wall', '-Wextra']
  endif
  if not is_msvc
    warning_flags += '-Wformat-security -Wsuggest-override -Wshadow -Wno-long-long'.split()
  endif
  if cpp_warnings == 'fatal'
    if not werror
      warning_flags += is_msvc ? ['/WX'] : ['-Werror']
    endif
    deprecations = 'G SIGCXX'.split()
    foreach d : deprecations
      warning_flags += '-D@0@_DISABLE_DEPRECATED'.format(d)
    endforeach
  endif
endif

warning_flags = cpp_compiler.get_supported_arguments(warning_flags)
add_project_arguments(warning_flags, language: 'cpp')

# Add toolset version in builds done with Visual Studio 2015 (v14x) or later
msvc14x_toolset_ver = ''

# MSVC: Ignore warnings that aren't really harmful, but make those
#       that should not be overlooked stand out.
if is_msvc
  disable_warnings_list = [
    '/FImsvc_recommended_pragmas.h', # Turn off harmless warnings but make potentially
                                     # dangerous ones glaring, distributed with GLib
    '/EHsc',  # avoid warnings caused by exception handling model used
    '/utf-8', # Avoid C4819 unicode conversion warnings when building on CJK locales
    '/wd4589', # Constructor of abstract class 'bb' ignores
               # initializer for virtual base class 'aa'
    '/wd4702', # unreachable code
  ]
  if host_machine.cpu_family() == 'x86_64' or host_machine.cpu_family() == 'aarch64'
  # 'var' : conversion from 'size_t' to 'type', possible loss of data (applies on 64-bit builds)
    disable_warnings_list += '/wd4267'
  endif
  add_project_arguments(
    cpp_compiler.get_supported_arguments(disable_warnings_list),
    language: 'cpp',
  )

  if use_msvc14x_toolset_ver
    if cpp_compiler.version().version_compare('>=19.30')
      msvc14x_toolset_ver = '-vc143'
    elif cpp_compiler.version().version_compare('>=19.20')
      msvc14x_toolset_ver = '-vc142'
    elif cpp_compiler.version().version_compare('>=19.10')
      msvc14x_toolset_ver = '-vc141'
    elif cpp_compiler.version().version_compare('>=19.00')
      msvc14x_toolset_ver = '-vc140'
    else
      message('Visual Studio toolset version not applied for pre-Visual Studio 2015 builds')
    endif
  endif
endif

glibmm_libname = meson.project_name() + msvc14x_toolset_ver + '-' + glibmm_api_version
giomm_libname = 'giomm' + msvc14x_toolset_ver + '-' + glibmm_api_version

subdir('tools')
subdir('glib')
subdir('MSVC_NMake/glibmm')
subdir('glib/glibmm')
subdir('gio')
subdir('MSVC_NMake/giomm')
subdir('gio/giomm')
subdir('examples')
subdir('tests')
subdir('docs/reference')

# Add a ChangeLog file to the distribution directory.
meson.add_dist_script(
  python3, dist_changelog_py,
  project_source_root,
)

# Don't distribute these files.
dont_distribute = [
  'glibmm.doap',
  '.gitlab-ci.yml',
]
# Add build scripts to the distribution directory, and delete .gitignore
# files and an empty $MESON_PROJECT_DIST_ROOT/build/ directory.
meson.add_dist_script(
  python3, dist_build_scripts_py,
  project_source_root,
  'untracked' / 'build_scripts',
  dont_distribute,
)

if meson.is_subproject()
  # A version of gmmproc that can be executed uninstalled by a main project.
  conf_data_subproj = configuration_data()
  conf_data_subproj.merge_from(gmmproc_conf_data)
  conf_data_subproj.set('configure_input', 'tools/gmmproc (for execution uninstalled).  Generated from gmmproc.in')
  conf_data_subproj.set('libdir', project_build_root)
  gmmproc_subproj = configure_file(
    input: 'tools' / 'gmmproc.in',
    output: '@BASENAME@',
    configuration: conf_data_subproj,
    install: false,
  )
  gmmproc_subproj_dir = project_build_root / glibmm_pcname / 'proc'
  run_command(
    python3, handle_built_files_py, 'copy_built_files',
    project_build_root,
    gmmproc_subproj_dir,
    'gmmproc',
    check: true,
  )
  run_command(
    python3, handle_built_files_py, 'copy_built_files',
    project_build_root / 'tools',
    gmmproc_subproj_dir,
    'generate_wrap_init.pl',
    check: true,
  )

  # Copy files needed by gmmproc from source dir to build dir.
  # The directory structure must be the same as in the installation directory.
  run_command(
    python3, handle_built_files_py, 'copy_built_files',
    project_source_root / 'tools' / 'm4',
    gmmproc_subproj_dir / 'm4',
    m4_basefiles,
    check: true,
  )
  run_command(
    python3, handle_built_files_py, 'copy_built_files',
    project_source_root / 'tools' / 'pm',
    gmmproc_subproj_dir / 'pm',
    pm_basefiles,
    check: true,
  )

  pkgconfig_vars = {
    'htmlrefdir': install_prefix / install_docdir / 'reference' / 'html',
    'htmlrefpub': 'https://gnome.pages.gitlab.gnome.org/' + meson.project_name(),
  }
  if build_documentation
    pkgconfig_vars += {'doxytagfile': tag_file.full_path()}
    # May be used in a main project.
    global_tag_file_target = tag_file
  endif
  giomm_dep = declare_dependency(
    dependencies: giomm_own_dep,
    variables: pkgconfig_vars,
  )

  pkgconfig_vars += {'gmmprocdir': gmmproc_subproj_dir}
  glibmm_dep = declare_dependency(
    dependencies: glibmm_own_dep,
    variables: pkgconfig_vars,
  )

  # A main project that looks for glibmm_pcname.pc and giomm_pcname.pc
  # shall find glibmm_dep and giomm_dep.
  meson.override_dependency(glibmm_pcname, glibmm_dep)
  meson.override_dependency(giomm_pcname, giomm_dep)
endif

# Print a summary.
real_maintainer_mode = ''
if maintainer_mode_opt == 'if-git-build'
  real_maintainer_mode = ' (@0@)'.format(maintainer_mode)
endif

real_build_documentation = ''
if build_documentation_opt == 'if-maintainer-mode'
  real_build_documentation = ' (@0@)'.format(build_documentation)
endif

summary = [
  '',
  '------',
  meson.project_name() + ' ' + meson.project_version(),
  '',
  '         Maintainer mode: @0@@1@'.format(maintainer_mode_opt, real_maintainer_mode),
  '       Compiler warnings: @0@ (warning_level: @1@, werror: @2@)'. \
                             format(cpp_warnings, warning_level, werror),
  '    Build deprecated API: @0@'.format(build_deprecated_api),
  'Build HTML documentation: @0@@1@'.format(build_documentation_opt, real_build_documentation),
  '  Build example programs: @0@'.format(build_examples),
  'Directories:',
  '                  prefix: @0@'.format(install_prefix),
  '              includedir: @0@'.format(install_prefix / install_includedir),
  '        includeglibmmdir: @0@'.format(install_prefix / install_includedir / glibmm_pcname),
  '         includegiommdir: @0@'.format(install_prefix / install_includedir / giomm_pcname),
  '                  libdir: @0@'.format(install_prefix / install_libdir),
  '         glibmmconfigdir: @0@'.format(install_prefix / install_glibmmconfigdir),
  '          giommconfigdir: @0@'.format(install_prefix / install_giommconfigdir),
  '              gmmprocdir: @0@'.format(install_prefix / install_procdir),
  '            pkgconfigdir: @0@'.format(install_prefix / install_pkgconfigdir),
  '                 datadir: @0@'.format(install_prefix / install_datadir),
  '                  docdir: @0@'.format(install_prefix / install_docdir),
  '              devhelpdir: @0@'.format(install_prefix / install_devhelpdir),
  '------'
]

message('\n'.join(summary))