meson: Add options to control optional parts

Distributions want explicit control over optional parts so they can
state runtime dependencies before building. Let's restore the
functionality autotools used to provide.

Where possible, the selection is done by choosing whether to build a
particular item and the option name is build_$item. Example:
build_overlay. Where not possible, the option name is
with_$item. Example: with_valgrind.

Array options require a bump of required meson version to 0.44. Debian
stable has meson 0.37 which is already too old, stable-backports has
0.45, CI uses 0.45. Mesa's meson requirement is 0.44.1, for a
perspective.

Note, the old hack for not building docs when cross-compiling is
gone, as doc building can be explicitly controlled now.

v2: glib not optional
v3: bump meson version to 0.44

Signed-off-by: Petri Latvala <petri.latvala@intel.com>
Cc: Matt Turner <mattst88@gmail.com>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Eric Anholt <eric@anholt.net>
Cc: Arkadiusz Hiler <arkadiusz.hiler@intel.com>
Signed-off-by: Arkadiusz Hiler <arkadiusz.hiler@intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>

6 files changed, 225 insertions, 37 deletions

diff --git a/benchmarks/meson.build b/benchmarks/meson.build
index 27836c1d..baf1243d 100644
--- a/benchmarks/meson.build
+++ b/benchmarks/meson.build
@@ -35,10 +35,10 @@ foreach prog : benchmark_progs
 	executable(prog + '_bench', prog + '.c',
 		   install : true,
 		   install_dir : benchmarksdir,
-		   dependencies : test_deps)
+		   dependencies : igt_deps)
 endforeach
 
 executable('gem_wsim_bench', 'gem_wsim.c',
 	   install : true,
 	   install_dir : benchmarksdir,
-	   dependencies : test_deps + [ lib_igt_perf ])
+	   dependencies : igt_deps + [ lib_igt_perf ])
diff --git a/man/meson.build b/man/meson.build
index 49b0686a..fa01f9dd 100644
--- a/man/meson.build
+++ b/man/meson.build
@@ -22,10 +22,10 @@ defs_rst = configure_file(input : 'defs.rst.in',
 		output : 'defs.rst',
 		configuration : config)
 
-rst2man = find_program('rst2man', required : false)
+rst2man = find_program('rst2man', required : _man_required)
 rst2man_script = find_program('rst2man.sh')
 
-if rst2man.found()
+if _build_man and rst2man.found()
 	foreach manpage : manpages
 		custom_target(manpage + '.1',
 				build_by_default : true,
@@ -36,4 +36,10 @@ if rst2man.found()
 				install : true,
 				install_dir : join_paths(mandir, 'man1'))
 	endforeach
+	build_info += 'Build man pages: Yes'
+else
+	if _man_required
+		error('Cannot build man pages due to missing dependencies')
+	endif
+	build_info += 'Build man pages: No'
 endif
diff --git a/meson.build b/meson.build
index 98216fc4..4d15d623 100644
--- a/meson.build
+++ b/meson.build
@@ -5,7 +5,7 @@ project('igt-gpu-tools', 'c',
           'c_std=gnu99',
         ],
 	license : 'MIT',
-	meson_version : '>0.40.0')
+	meson_version : '>0.44.0')
 
 cc = meson.get_compiler('c')
 
@@ -26,36 +26,118 @@ foreach cc_arg : cc_args
   endif
 endforeach
 
+_build_overlay = false
+_overlay_required = false
+_build_man = false
+_man_required = false
+_build_audio = false
+_audio_required = false
+_build_chamelium = false
+_chamelium_required = false
+_build_docs = false
+_docs_required = false
+_build_tests = false
+_tests_required = false
+
+build_overlay = get_option('build_overlay')
+overlay_backends = get_option('overlay_backends')
+build_man = get_option('build_man')
+with_valgrind = get_option('with_valgrind')
+build_audio = get_option('build_audio')
+build_chamelium = get_option('build_chamelium')
+build_docs = get_option('build_docs')
+build_tests = get_option('build_tests')
+with_libdrm = get_option('with_libdrm')
+
+_build_overlay = build_overlay != 'false'
+_overlay_required = build_overlay == 'true'
+_build_man = build_man != 'false'
+_man_required = build_man == 'true'
+_build_audio = build_audio != 'false'
+_audio_required = build_audio == 'true'
+_build_chamelium = build_chamelium != 'false'
+_chamelium_required = build_chamelium == 'true'
+_build_docs = build_docs != 'false'
+_docs_required = build_docs == 'true'
+_build_tests = build_tests != 'false'
+_tests_required = build_tests == 'true'
+
+build_info = []
+
 inc = include_directories('include/drm-uapi', 'lib', '.')
 
 inc_for_gtkdoc = include_directories('lib')
 
 config = configuration_data()
 
+null_dep = dependency('', required : false)
+
+libdrm_info = []
+libdrm_intel = null_dep
+libdrm_nouveau = null_dep
+libdrm_amdgpu = null_dep
+
 libdrm_version = '>=2.4.82'
 libdrm = dependency('libdrm', version : libdrm_version)
-libdrm_intel = dependency('libdrm_intel', version : libdrm_version, required : false)
-libdrm_nouveau = dependency('libdrm_nouveau', version : libdrm_version, required : false)
-libdrm_amdgpu = dependency('libdrm_amdgpu', version : libdrm_version, required : false)
+if with_libdrm.contains('auto') or with_libdrm.contains('intel')
+	libdrm_intel = dependency('libdrm_intel', version : libdrm_version, required : with_libdrm.contains('intel'))
+	libdrm_info += 'intel'
+endif
+if with_libdrm.contains('auto') or with_libdrm.contains('nouveau')
+	libdrm_nouveau = dependency('libdrm_nouveau', version : libdrm_version, required : with_libdrm.contains('nouveau'))
+	libdrm_info += 'nouveau'
+endif
+if with_libdrm.contains('auto') or with_libdrm.contains('amdgpu')
+	libdrm_amdgpu = dependency('libdrm_amdgpu', version : libdrm_version, required : with_libdrm.contains('amdgpu'))
+	libdrm_info += 'amdgpu'
+endif
+
+build_info += 'With libdrm: ' + ','.join(libdrm_info)
 
 pciaccess = dependency('pciaccess', version : '>=0.10')
 libkmod = dependency('libkmod')
 libprocps = dependency('libprocps', required : true)
 libunwind = dependency('libunwind', required : true)
 
-valgrind = dependency('valgrind', required : false)
-if valgrind.found()
-	config.set('HAVE_VALGRIND', 1)
+valgrind = null_dep
+valgrindinfo = 'No'
+if with_valgrind != 'false'
+	valgrind = dependency('valgrind', required : with_valgrind == 'true')
+	if valgrind.found()
+		config.set('HAVE_VALGRIND', 1)
+		valgrindinfo = 'Yes'
+	endif
 endif
+build_info += 'Valgrind annotations: ' + valgrindinfo
 
 cairo = dependency('cairo', version : '>1.12.0', required : true)
 libudev = dependency('libudev', required : true)
 glib = dependency('glib-2.0', required : true)
 
-gsl = dependency('gsl', required : false)
-alsa = dependency('alsa', required : false)
+gsl = null_dep
+alsa = null_dep
+pixman = null_dep
+if _build_audio or _build_chamelium
+	gsl = dependency('gsl', required : _audio_required or _chamelium_required)
+endif
+if _build_audio
+	alsa = dependency('alsa', required : _audio_required)
+endif
+if _build_chamelium
+	pixman = dependency('pixman-1', required : _chamelium_required)
+endif
+
+audioinfo = 'No'
+if _build_audio and alsa.found() and gsl.found()
+	audioinfo = 'Yes'
+else
+	if _audio_required
+		error('Cannot build audio test due to missing dependencies')
+	endif
+	_build_audio = false
+endif
+build_info += 'Build audio test: ' + audioinfo
 
-pixman = dependency('pixman-1', required : false)
 xmlrpc = dependency('xmlrpc', required : false)
 xmlrpc_util = dependency('xmlrpc_util', required : false)
 xmlrpc_client = dependency('xmlrpc_client', required : false)
@@ -73,13 +155,17 @@ if not xmlrpc.found() and xmlrpc_cmd.found()
 	endif
 endif
 
-if pixman.found() and gsl.found() and xmlrpc.found() and xmlrpc_util.found() and xmlrpc_client.found()
+chamelium = null_dep
+chameliuminfo = 'No'
+if _build_chamelium and pixman.found() and gsl.found() and xmlrpc.found() and xmlrpc_util.found() and xmlrpc_client.found()
 	chamelium = declare_dependency(dependencies : [ pixman, xmlrpc,
-	  xmlrpc_util, xmlrpc_client])
+							xmlrpc_util, xmlrpc_client])
 	config.set('HAVE_CHAMELIUM', 1)
-else
-	chamelium = dependency('', required: false)
+	chameliuminfo = 'Yes'
+elif _chamelium_required
+	error('Cannot build chamelium test due to missing dependencies')
 endif
+build_info += 'Build Chamelium test: ' + chameliuminfo
 
 pthreads = dependency('threads')
 math = cc.find_library('m')
@@ -130,17 +216,33 @@ mandir = get_option('mandir')
 pkgconfigdir = join_paths(libdir, 'pkgconfig')
 
 subdir('lib')
-subdir('tests')
+if _build_tests
+	subdir('tests')
+	build_info += 'Build tests: Yes'
+else
+	build_info += 'Build tests: No'
+endif
 subdir('benchmarks')
 subdir('tools')
 if libdrm_intel.found()
 	subdir('assembler')
-	if ['x86', 'x86_64'].contains(host_machine.cpu_family())
-		subdir('overlay')
-	endif
 endif
+subdir('overlay')
 subdir('man')
-# has_exe_wrapper() is undefined if building natively
-if not meson.is_cross_build() or not meson.has_exe_wrapper()
-	subdir('docs')
+
+docs_info = 'No'
+if _build_docs
+	if _build_tests
+		subdir('docs')
+		docs_info = 'Yes'
+	elif _docs_required
+		error('Documentation requires building tests')
+	endif
 endif
+build_info += 'Build documentation: ' + docs_info
+
+message('Build options')
+message('=============')
+foreach str : build_info
+	message(str)
+endforeach
diff --git a/meson_options.txt b/meson_options.txt
index 41be35e0..05e63463 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -1,3 +1,57 @@
+option('build_overlay',
+       type : 'combo',
+       value : 'auto',
+       choices : ['auto', 'true', 'false'],
+       description : 'Build overlay')
+
+option('overlay_backends',
+       type : 'array',
+       value : ['auto'],
+       choices : [ 'auto', 'x', 'xv' ],
+       description : 'Overlay backends to enable')
+
+option('build_audio',
+       type : 'combo',
+       value : 'auto',
+       choices : ['auto', 'true', 'false'],
+       description : 'Build audio test')
+
+option('build_chamelium',
+       type : 'combo',
+       value : 'auto',
+       choices : ['auto', 'true', 'false'],
+       description : 'Build chamelium test')
+
+option('with_valgrind',
+       type : 'combo',
+       value : 'auto',
+       choices : ['auto', 'true', 'false'],
+       description : 'Build with support for valgrind annotations')
+
+option('build_man',
+       type : 'combo',
+       value : 'auto',
+       choices : ['auto', 'true', 'false'],
+       description : 'Build man pages')
+
+option('build_docs',
+       type : 'combo',
+       value : 'auto',
+       choices : ['auto', 'true', 'false'],
+       description : 'Build documentation')
+
+option('build_tests',
+       type : 'combo',
+       value : 'auto',
+       choices : ['auto', 'true', 'false'],
+       description : 'Build tests')
+
+option('with_libdrm',
+       type : 'array',
+       value : ['auto'],
+       choices : ['', 'auto', 'intel', 'nouveau', 'amdgpu'],
+       description : 'libdrm libraries to be used')
+
 option('use_rpath',
        type : 'boolean',
        value : false,
diff --git a/overlay/meson.build b/overlay/meson.build
index 546c8377..46d2d494 100644
--- a/overlay/meson.build
+++ b/overlay/meson.build
@@ -14,20 +14,35 @@ gpu_overlay_src = [
 	'rc6.c',
 ]
 
-xv = dependency('xv', required : false)
-x11 = dependency('x11', required : false)
-xext = dependency('xext', required : false)
-dri2proto = dependency('dri2proto', version : '>= 2.6', required : false)
-cairo_xlib = dependency('cairo-xlib', required : false)
-xrandr = dependency('xrandr', version : '>=1.3', required : false)
+xv_backend_required = false
+xlib_backend_required = false
+build_xv_backend = overlay_backends.contains('xv') or overlay_backends.contains('auto')
+build_xlib_backend = overlay_backends.contains('x') or overlay_backends.contains('auto')
+if _overlay_required
+	xv_backend_required = overlay_backends.contains('xv')
+	xlib_backend_required = overlay_backends.contains('x')
+endif
+
+xv = dependency('xv', required : xv_backend_required)
+x11 = dependency('x11', required : xv_backend_required)
+xext = dependency('xext', required : xv_backend_required)
+dri2proto = dependency('dri2proto',
+		       version : '>= 2.6',
+		       required : xv_backend_required or xlib_backend_required)
+cairo_xlib = dependency('cairo-xlib', required : xlib_backend_required)
+xrandr = dependency('xrandr', version : '>=1.3', required : _overlay_required)
 
 gpu_overlay_deps = [ realtime, math, cairo, pciaccess, libdrm,
 	libdrm_intel, lib_igt_perf ]
 
 both_x11_src = ''
 
+with_xv_backend = false
+with_xlib_backend = false
+backends_strings = []
+
 gpu_overlay_cflags = []
-if xv.found() and x11.found() and xext.found() and dri2proto.found()
+if build_xv_backend and xv.found() and x11.found() and xext.found() and dri2proto.found()
 	both_x11_src = 'x11/position.c'
 	gpu_overlay_src += [
 		'x11/dri2.c',
@@ -38,20 +53,24 @@ if xv.found() and x11.found() and xext.found() and dri2proto.found()
 	]
 	gpu_overlay_deps += [ xv, x11, xext, dri2proto ]
 	gpu_overlay_cflags += [ '-DHAVE_OVERLAY_XVLIB' ]
+	with_xv_backend = true
+	backends_strings += 'Xv'
 endif
 
-if cairo_xlib.found() and xrandr.found() and dri2proto.found()
+if build_xlib_backend and cairo_xlib.found() and dri2proto.found()
 	both_x11_src = 'x11/position.c'
 	gpu_overlay_src += 'x11/x11-window.c'
 	gpu_overlay_deps += [ cairo_xlib, dri2proto ]
 	gpu_overlay_cflags += [ '-DHAVE_OVERLAY_XLIB' ]
+	with_xlib_backend = true
+	backends_strings += 'X'
 endif
 
 gpu_overlay_src += both_x11_src
 
 gpu_overlay_src += 'kms/kms-overlay.c'
 
-leg = find_program('leg', required : false)
+leg = find_program('leg', required : _overlay_required)
 if leg.found()
 	leg_file = custom_target('tracepoint_format',
 		output: 'tracepoint_format.h',
@@ -62,10 +81,17 @@ else
 	message('WARNING: leg command not found, disabling overlay; try : apt-get install peg')
 endif
 
-if leg.found() and xrandr.found() and cairo.found()
+if _build_overlay and ['x86', 'x86_64'].contains(host_machine.cpu_family()) and libdrm_intel.found() and leg.found() and xrandr.found() and cairo.found() and (with_xlib_backend or with_xv_backend)
 	executable('intel-gpu-overlay', gpu_overlay_src,
 			include_directories : inc,
 			c_args : gpu_overlay_cflags,
 			dependencies : gpu_overlay_deps,
 			install : true)
+	build_info += 'Build overlay: Yes'
+	build_info += 'Overlay backends: ' + ','.join(backends_strings)
+else
+	if _overlay_required
+		error('Cannot build overlay due to missing dependencies')
+	endif
+	build_info += 'Build overlay: No'
 endif
diff --git a/tests/meson.build b/tests/meson.build
index cedb4ff1..9ec39e08 100644
--- a/tests/meson.build
+++ b/tests/meson.build
@@ -232,14 +232,14 @@ if libdrm_nouveau.found()
 	test_deps += libdrm_nouveau
 endif
 
-if chamelium.found()
+if _build_chamelium and chamelium.found()
 	test_progs += [
 		'kms_chamelium',
 	]
 	test_deps += chamelium
 endif
 
-if alsa.found() and gsl.found()
+if _build_audio and alsa.found() and gsl.found()
 	test_progs += [
 		'audio',
 	]