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gstreamer/meson.build
Tim-Philipp Müller dc29bc4e13 libs: fix API export/import and 'inconsistent linkage' on MSVC 
For each lib we build export its own API in headers when we're
building it, otherwise import the API from the headers.

This fixes linker warnings on Windows when building with MSVC.

The problem was that we had defined all GST_*_API decorators
unconditionally to GST_EXPORT. This was intentional and only
supposed to be temporary, but caused linker warnings because
we tell the linker that we want to export all symbols even
those from externall DLLs, and when the linker notices that
they were in external DLLS and not present locally it warns.

What we need to do when building each library is: export
the library's own symbols and import all other symbols. To
this end we define e.g. BUILDING_GST_FOO and then we define
the GST_FOO_API decorator either to export or to import
symbols depending on whether BUILDING_GST_FOO is set or not.
That way external users of each library API automatically
get the import.

While we're at it, add new GST_API_EXPORT in config.h and use
that for GST_*_API decorators instead of GST_EXPORT.

The right export define depends on the toolchain and whether
we're using -fvisibility=hidden or not, so it's better to set it
to the right thing directly than hard-coding a compiler whitelist
in the public header.

We put the export define into config.h instead of passing it via the
command line to the compiler because it might contain spaces and brackets
and in the autotools scenario we'd have to pass that through multiple
layers of plumbing and Makefile/shell escaping and we're just not going
to be *that* lucky.

The export define is only used if we're compiling our lib, not by external
users of the lib headers, so it's not a problem to put it into config.h

Also, this means all .c files of libs need to include config.h
to get the export marker defined, so fix up a few that didn't
include config.h.

This commit depends on a common submodule commit that makes gst-glib-gen.mak
add an #include "config.h" to generated enum/marshal .c files for the
autotools build.

https://bugzilla.gnome.org/show_bug.cgi?id=797185
2018-09-24 08:45:34 +01:00

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project('gst-plugins-base', 'c',
version : '1.15.0.1',
meson_version : '>= 0.47',
default_options : [ 'warning_level=1',
'buildtype=debugoptimized' ])
gst_version = meson.project_version()
version_arr = gst_version.split('.')
gst_version_major = version_arr[0].to_int()
gst_version_minor = version_arr[1].to_int()
gst_version_micro = version_arr[2].to_int()
if version_arr.length() == 4
gst_version_nano = version_arr[3].to_int()
else
gst_version_nano = 0
endif
gst_version_is_dev = gst_version_minor % 2 == 1 and gst_version_micro < 90
have_cxx = add_languages('cpp', required : false)
have_objc = add_languages('objc', required : false)
glib_req = '>= 2.40.0'
orc_req = '>= 0.4.24'
gst_req = '>= @0@.@1@.0'.format(gst_version_major, gst_version_minor)
api_version = '1.0'
soversion = 0
# maintaining compatibility with the previous libtool versioning
# current = minor * 100 + micro
curversion = gst_version_minor * 100 + gst_version_micro
libversion = '@0@.@1@.0'.format(soversion, curversion)
osxversion = curversion + 1
plugins_install_dir = '@0@/gstreamer-1.0'.format(get_option('libdir'))
cc = meson.get_compiler('c')
host_system = host_machine.system()
if cc.get_id() == 'msvc'
# Ignore several spurious warnings for things gstreamer does very commonly
# If a warning is completely useless and spammy, use '/wdXXXX' to suppress it
# If a warning is harmless but hard to fix, use '/woXXXX' so it's shown once
# NOTE: Only add warnings here if you are sure they're spurious
add_project_arguments(
'/wd4018', # implicit signed/unsigned conversion
'/wd4146', # unary minus on unsigned (beware INT_MIN)
'/wd4244', # lossy type conversion (e.g. double -> int)
'/wd4305', # truncating type conversion (e.g. double -> float)
cc.get_supported_arguments(['/utf-8']), # set the input encoding to utf-8
language : 'c')
# Disable SAFESEH with MSVC for plugins and libs that use external deps that
# are built with MinGW
noseh_link_args = ['/SAFESEH:NO']
else
noseh_link_args = []
endif
if cc.has_link_argument('-Wl,-Bsymbolic-functions')
add_project_link_arguments('-Wl,-Bsymbolic-functions', language : 'c')
endif
core_conf = configuration_data()
# Symbol visibility
if cc.get_id() == 'msvc'
export_define = '__declspec(dllexport) extern'
elif cc.has_argument('-fvisibility=hidden')
add_project_arguments('-fvisibility=hidden', language: 'c')
export_define = 'extern __attribute__ ((visibility ("default")))'
else
export_define = 'extern'
endif
# Passing this through the command line would be too messy
core_conf.set('GST_API_EXPORT', export_define)
# Disable strict aliasing
if cc.has_argument('-fno-strict-aliasing')
add_project_arguments('-fno-strict-aliasing', language: 'c')
endif
# Define G_DISABLE_DEPRECATED for development versions
if gst_version_is_dev
message('Disabling deprecated GLib API')
add_project_arguments('-DG_DISABLE_DEPRECATED', language: 'c')
endif
cast_checks = get_option('gobject-cast-checks')
if cast_checks.disabled() or (cast_checks.auto() and not gst_version_is_dev)
message('Disabling GLib cast checks')
add_project_arguments('-DG_DISABLE_CAST_CHECKS', language: 'c')
endif
glib_asserts = get_option('glib-asserts')
if glib_asserts.disabled() or (glib_asserts.auto() and not gst_version_is_dev)
message('Disabling GLib asserts')
add_project_arguments('-DG_DISABLE_ASSERT', language: 'c')
endif
glib_checks = get_option('glib-checks')
if glib_checks.disabled() or (glib_checks.auto() and not gst_version_is_dev)
message('Disabling GLib checks')
add_project_arguments('-DG_DISABLE_CHECKS', language: 'c')
endif
check_headers = [
['HAVE_DLFCN_H', 'dlfcn.h'],
['HAVE_EMMINTRIN_H', 'emmintrin.h'],
['HAVE_INTTYPES_H', 'inttypes.h'],
['HAVE_MEMORY_H', 'memory.h'],
['HAVE_PROCESS_H', 'process.h'],
['HAVE_SMMINTRIN_H', 'smmintrin.h'],
['HAVE_STDINT_H', 'stdint.h'],
['HAVE_STDLIB_H', 'stdlib.h'],
['HAVE_STRINGS_H', 'strings.h'],
['HAVE_STRING_H', 'string.h'],
['HAVE_SYS_SOCKET_H', 'sys/socket.h'],
['HAVE_SYS_STAT_H', 'sys/stat.h'],
['HAVE_SYS_TYPES_H', 'sys/types.h'],
['HAVE_SYS_WAIT_H', 'sys/wait.h'],
['HAVE_UNISTD_H', 'unistd.h'],
['HAVE_WINSOCK2_H', 'winsock2.h'],
['HAVE_XMMINTRIN_H', 'xmmintrin.h'],
['HAVE_LINUX_DMA_BUF_H', 'linux/dma-buf.h'],
]
foreach h : check_headers
if cc.has_header(h.get(1))
core_conf.set(h.get(0), 1)
endif
endforeach
check_functions = [
['HAVE_DCGETTEXT', 'dcgettext', '#include<libintl.h>'],
['HAVE_GMTIME_R', 'gmtime_r', '#include<time.h>'],
['HAVE_LRINTF', 'lrintf', '#include<math.h>'],
['HAVE_MMAP', 'mmap', '#include<sys/mman.h>'],
['HAVE_LOG2', 'log2', '#include<math.h>'],
]
libm = cc.find_library('m', required : false)
foreach f : check_functions
if cc.has_function(f.get(1), prefix : f.get(2), dependencies : libm)
core_conf.set(f.get(0), 1)
endif
endforeach
core_conf.set('SIZEOF_CHAR', cc.sizeof('char'))
core_conf.set('SIZEOF_INT', cc.sizeof('int'))
core_conf.set('SIZEOF_LONG', cc.sizeof('long'))
core_conf.set('SIZEOF_SHORT', cc.sizeof('short'))
core_conf.set('SIZEOF_VOIDP', cc.sizeof('void*'))
core_conf.set_quoted('GETTEXT_PACKAGE', 'gst-plugins-base-1.0')
core_conf.set_quoted('LOCALEDIR', join_paths(get_option('prefix'), get_option('localedir')))
core_conf.set_quoted('PACKAGE', 'gst-plugins-base')
core_conf.set_quoted('VERSION', gst_version)
core_conf.set_quoted('PACKAGE_VERSION', gst_version)
core_conf.set_quoted('GST_API_VERSION', api_version)
core_conf.set_quoted('GST_DATADIR', join_paths(get_option('prefix'), get_option('datadir')))
core_conf.set_quoted('GST_LICENSE', 'LGPL')
install_plugins_helper = get_option('install_plugins_helper')
if install_plugins_helper == ''
install_plugins_helper = join_paths(get_option('prefix'),
get_option('libexecdir'),
'gst-install-plugins-helper')
endif
core_conf.set_quoted('GST_INSTALL_PLUGINS_HELPER', install_plugins_helper)
warning_flags = [
'-Wmissing-declarations',
'-Wredundant-decls',
'-Wundef',
'-Wwrite-strings',
'-Wformat',
'-Wformat-nonliteral',
'-Wformat-security',
'-Winit-self',
'-Wmissing-include-dirs',
'-Waddress',
'-Wno-multichar',
'-Wvla',
'-Wpointer-arith',
]
warning_c_flags = [
'-Wmissing-prototypes',
'-Wdeclaration-after-statement',
]
warning_cxx_flags = [
'-Waggregate-return',
]
if have_cxx
cxx = meson.get_compiler('cpp')
foreach extra_arg : warning_cxx_flags
if cxx.has_argument (extra_arg)
add_project_arguments([extra_arg], language: 'cpp')
endif
endforeach
endif
foreach extra_arg : warning_flags
if cc.has_argument (extra_arg)
add_project_arguments([extra_arg], language: 'c')
endif
if have_cxx and cxx.has_argument (extra_arg)
add_project_arguments([extra_arg], language: 'cpp')
endif
endforeach
foreach extra_arg : warning_c_flags
if cc.has_argument (extra_arg)
add_project_arguments([extra_arg], language: 'c')
endif
endforeach
# GStreamer package name and origin url
gst_package_name = get_option('package-name')
if gst_package_name == ''
if gst_version_nano == 0
gst_package_name = 'GStreamer Base Plug-ins source release'
elif gst_version_nano == 1
gst_package_name = 'GStreamer Base Plug-ins git'
else
gst_package_name = 'GStreamer Base Plug-ins prerelease'
endif
endif
core_conf.set_quoted('GST_PACKAGE_NAME', gst_package_name)
core_conf.set_quoted('GST_PACKAGE_ORIGIN', get_option('package-origin'))
# FIXME: These should be configure options
core_conf.set_quoted('DEFAULT_VIDEOSINK', 'autovideosink')
core_conf.set_quoted('DEFAULT_AUDIOSINK', 'autoaudiosink')
# Set whether the audioresampling method should be detected at runtime
core_conf.set('AUDIORESAMPLE_FORMAT_' + get_option('audioresample_format').to_upper(), true)
gst_plugins_base_args = ['-DHAVE_CONFIG_H']
if get_option('default_library') == 'static'
gst_plugins_base_args += ['-DGST_STATIC_COMPILATION']
endif
# X11 checks are for sys/ and tests/
x11_dep = dependency('x11', required : get_option('x11'))
# GLib checks are for the entire project
# Almost everything that uses glib also uses gobject
glib_deps = [dependency('glib-2.0', version : glib_req, fallback: ['glib', 'libglib_dep']),
dependency('gobject-2.0', fallback: ['glib', 'libgobject_dep'])]
# GIO is used by the GIO plugin, and by the TCP, SDP, and RTSP plugins
gio_dep = dependency('gio-2.0', fallback: ['glib', 'libgio_dep'])
giounix_dep = dependency('gio-unix-2.0', version : glib_req, required : host_system != 'windows',
fallback: ['glib', 'libgiounix_dep'])
gmodule_dep = dependency('gmodule-no-export-2.0',
fallback: ['glib', 'libgmodule_dep'])
# some of the examples can use gdk-pixbuf and GTK+3
gdk_pixbuf_dep = dependency('gdk-pixbuf-2.0', required : get_option('examples'))
gtk_dep = dependency('gtk+-3.0', version : '>= 3.10', required : get_option('examples'))
# TODO: https://github.com/mesonbuild/meson/issues/3941
if not get_option('x11').disabled()
gtk_x11_dep = dependency('gtk+-x11-3.0', version : '>= 3.10', required : get_option('examples'))
else
gtk_x11_dep = dependency('', required : false)
endif
# gtk+ quartz backend is only available on macOS
if host_system == 'darwin'
gtk_quartz_dep = dependency('gtk+-quartz-3.0', version : '>= 3.10', required : get_option('examples'))
else
gtk_quartz_dep = dependency('', required : false)
endif
core_conf.set('HAVE_X', x11_dep.found())
core_conf.set('HAVE_GIO_UNIX_2_0', giounix_dep.found())
if gio_dep.type_name() == 'pkgconfig'
core_conf.set_quoted('GIO_MODULE_DIR',
gio_dep.get_pkgconfig_variable('giomoduledir'))
core_conf.set_quoted('GIO_LIBDIR',
gio_dep.get_pkgconfig_variable('libdir'))
core_conf.set_quoted('GIO_PREFIX',
gio_dep.get_pkgconfig_variable('prefix'))
else
core_conf.set_quoted('GIO_MODULE_DIR', join_paths(get_option('prefix'),
get_option('libdir'), 'gio/modules'))
core_conf.set_quoted('GIO_LIBDIR', join_paths(get_option('prefix'),
get_option('libdir')))
core_conf.set_quoted('GIO_PREFIX', get_option('prefix'))
endif
configinc = include_directories('.')
libsinc = include_directories('gst-libs')
# To use the subproject make subprojects directory
# and put gstreamer meson git there (symlinking is fine)
gst_dep = dependency('gstreamer-1.0', version : gst_req,
fallback : ['gstreamer', 'gst_dep'])
gst_base_dep = dependency('gstreamer-base-1.0', version : gst_req,
fallback : ['gstreamer', 'gst_base_dep'])
gst_net_dep = dependency('gstreamer-net-1.0', version : gst_req,
fallback : ['gstreamer', 'gst_net_dep'])
if host_system != 'windows'
gst_check_dep = dependency('gstreamer-check-1.0', version : gst_req,
required : get_option('tests'),
fallback : ['gstreamer', 'gst_check_dep'])
endif
gst_controller_dep = dependency('gstreamer-controller-1.0', version : gst_req,
fallback : ['gstreamer', 'gst_controller_dep'])
have_orcc = false
orcc_args = []
# Used by various libraries/elements that use Orc code
orc_dep = dependency('orc-0.4', version : orc_req, required : get_option('orc'))
orcc = find_program('orcc', required : get_option('orc'))
if orc_dep.found() and orcc.found()
have_orcc = true
orcc_args = [orcc, '--include', 'glib.h']
core_conf.set('HAVE_ORC', 1)
else
message('Orc Compiler not found or disabled, will use backup C code')
core_conf.set('DISABLE_ORC', 1)
endif
# Used to build SSE* things in audio-resampler
sse_args = '-msse'
sse2_args = '-msse2'
sse41_args = '-msse4.1'
have_sse = cc.has_argument(sse_args)
have_sse2 = cc.has_argument(sse2_args)
have_sse41 = cc.has_argument(sse41_args)
if gst_dep.type_name() == 'internal'
gst_proj = subproject('gstreamer')
if not gst_proj.get_variable('gst_debug')
message('GStreamer debug system is disabled')
add_project_arguments('-Wno-unused', language: 'c')
else
message('GStreamer debug system is enabled')
endif
else
# We can't check that in the case of subprojects as we won't
# be able to build against an internal dependency (which is not built yet)
if not cc.compiles('''
#include <gst/gstconfig.h>
#ifdef GST_DISABLE_GST_DEBUG
#error "debugging disabled, make compiler fail"
#endif''' , dependencies: gst_dep)
message('GStreamer debug system is disabled')
add_project_arguments('-Wno-unused', language: 'c')
else
message('GStreamer debug system is enabled')
endif
endif
gir = find_program('g-ir-scanner', required : get_option('introspection'))
gnome = import('gnome')
build_gir = gir.found() and not meson.is_cross_build()
gir_init_section = [ '--add-init-section=extern void gst_init(gint*,gchar**);' + \
'g_setenv("GST_REGISTRY_DISABLE", "yes", TRUE);' + \
'g_setenv("GST_REGISTRY_1.0", "@0@", TRUE);'.format(meson.current_build_dir() + '/gir_empty_registry.reg') + \
'g_setenv("GST_PLUGIN_PATH_1_0", "", TRUE);' + \
'g_setenv("GST_PLUGIN_SYSTEM_PATH_1_0", "", TRUE);' + \
'gst_init(NULL,NULL);' ]
pkgconfig = import('pkgconfig')
plugins_pkgconfig_install_dir = join_paths(plugins_install_dir, 'pkgconfig')
if get_option('default_library') == 'shared'
# If we don't build static plugins there is no need to generate pc files
plugins_pkgconfig_install_dir = disabler()
endif
subdir('gst-libs')
subdir('gst')
subdir('ext')
subdir('sys')
if not get_option('tools').disabled()
subdir('tools')
endif
subdir('tests')
subdir('pkgconfig')
# xgettext is optional (on Windows for instance)
if find_program('xgettext', required : get_option('nls')).found()
core_conf.set('ENABLE_NLS', 1)
subdir('po')
endif
if build_machine.system() == 'windows'
message('Disabling gtk-doc while building on Windows')
else
if find_program('gtkdoc-scan', required : get_option('gtk_doc')).found()
subdir('docs')
else
message('Not building documentation as gtk-doc was not found')
endif
endif
# Use core_conf after all subdirs have set values
configure_file(output : 'config.h', configuration : core_conf)
python3 = import('python3').find_python()
run_command(python3, '-c', 'import shutil; shutil.copy("hooks/pre-commit.hook", ".git/hooks/pre-commit")')
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