Re: [igt-dev] [PATCH i-g-t 1/4] lib: Make libunwind optional again

[Daniel Vetter <daniel@ffwll.ch>]

On Mon, Oct 29, 2018 at 12:20:50PM +0200, Petri Latvala wrote:
> On Mon, Oct 29, 2018 at 09:10:27AM +0100, Daniel Vetter wrote:
> > Apparently it's really not great to require it for a bunch of
> > platforms. Requested by Sean and Eric.
> > 
> > Cc: Sean Paul <sean@poorly.run>
> > Cc: Eric Anholt <eric@anholt.net>
> > Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
> > ---
> >  lib/meson.build                 |  7 ++++-
> >  lib/stubs/libunwind/libunwind.h | 46 +++++++++++++++++++++++++++++++++
> >  meson.build                     | 13 +++++++++-
> >  meson_options.txt               |  6 +++++
> >  4 files changed, 70 insertions(+), 2 deletions(-)
> >  create mode 100644 lib/stubs/libunwind/libunwind.h
> > 
> > diff --git a/lib/meson.build b/lib/meson.build
> > index 7e2c9b7a98e0..8961ca494af8 100644
> > --- a/lib/meson.build
> > +++ b/lib/meson.build
> > @@ -59,7 +59,6 @@ lib_deps = [
> >  	libkmod,
> >  	libprocps,
> >  	libudev,
> > -	libunwind,
> >  	libdw,
> >  	pciaccess,
> >  	pthreads,
> > @@ -76,6 +75,12 @@ else
> >  	inc = [ inc, include_directories('stubs/drm') ]
> >  endif
> >  
> > +if libunwind.found()
> > +	lib_deps += libunwind
> > +else
> > +	inc = [ inc, include_directories('stubs/libunwind') ]
> > +endif
> > +
> >  if valgrind.found()
> >  	lib_deps += valgrind
> >  endif
> > diff --git a/lib/stubs/libunwind/libunwind.h b/lib/stubs/libunwind/libunwind.h
> > new file mode 100644
> > index 000000000000..ce5f30df6ce1
> > --- /dev/null
> > +++ b/lib/stubs/libunwind/libunwind.h
> > @@ -0,0 +1,46 @@
> > +/*
> > + * Copyright © 2018 Intel Corporation
> > + *
> > + * Permission is hereby granted, free of charge, to any person obtaining a
> > + * copy of this software and associated documentation files (the "Software"),
> > + * to deal in the Software without restriction, including without limitation
> > + * the rights to use, copy, modify, merge, publish, distribute, sublicense,
> > + * and/or sell copies of the Software, and to permit persons to whom the
> > + * Software is furnished to do so, subject to the following conditions:
> > + *
> > + * The above copyright notice and this permission notice (including the next
> > + * paragraph) shall be included in all copies or substantial portions of the
> > + * Software.
> > + *
> > + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
> > + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
> > + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
> > + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
> > + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
> > + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
> > + * IN THE SOFTWARE.
> > + *
> > + * Authors:
> > + *    Daniel Vetter <daniel.vetter@ffwll.ch>
> > + */
> > +
> > +/* dummy libunwind header with stubs, only the minimal amount we need to get by */
> > +
> > +
> > +typedef int unw_cursor_t;
> > +typedef int unw_context_t;
> > +typedef int unw_word_t;
> > +
> > +#define UNW_REG_IP 0
> > +
> > +static inline void unw_getcontext(unw_context_t *uc) {}
> > +static inline void unw_init_local(unw_cursor_t *cursor, unw_context_t *uc) {}
> > +static inline int unw_step(unw_cursor_t *cursor) { return 0; }
> > +static inline int unw_get_reg (unw_cursor_t *cursor, int i, unw_word_t * word)
> > +{
> > +	return 0;
> > +}
> > +static inline int unw_get_proc_name (unw_cursor_t *cursor, char *c, size_t s, unw_word_t *word)
> > +{
> > +	return 0;
> > +}
> > diff --git a/meson.build b/meson.build
> > index eff35585f619..d0cdffffbaf6 100644
> > --- a/meson.build
> > +++ b/meson.build
> > @@ -50,6 +50,7 @@ build_chamelium = get_option('build_chamelium')
> >  build_docs = get_option('build_docs')
> >  build_tests = get_option('build_tests')
> >  with_libdrm = get_option('with_libdrm')
> > +with_libunwind = get_option('with_libunwind')
> >  build_runner = get_option('build_runner')
> >  
> >  _build_overlay = build_overlay != 'false'
> > @@ -102,7 +103,17 @@ 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)
> > +
> > +libunwind = null_dep
> > +libunwindinfo = 'No'
> > +if with_libunwind.contains('auto') or with_libunwind.contains('true')
> > +	libunwind = dependency('libunwind', required : with_libunwind.contains('true'))
> > +	if libunwind.found()
> > +		libunwindinfo = 'Yes'
> > +	endif
> > +endif
> > +build_info += 'With libunwind: ' + libunwindinfo
> > +
> >  libdw = dependency('libdw', required : true)
> >  ssl = dependency('openssl', required : true)
> >  pixman = dependency('pixman-1', required : true)
> > diff --git a/meson_options.txt b/meson_options.txt
> > index 89a3731c19ee..c33c4b264d86 100644
> > --- a/meson_options.txt
> > +++ b/meson_options.txt
> > @@ -52,6 +52,12 @@ option('with_libdrm',
> >         choices : ['', 'auto', 'intel', 'nouveau', 'amdgpu'],
> >         description : 'libdrm libraries to be used')
> >  
> > +option('with_libunwind',
> > +       type : 'array',
> > +       value : ['auto'],
> > +       choices : ['auto', 'true', 'false'],
> > +       description : 'Use libunwind')
> > +
> 
> 
> Why array instead of combo?

Cause I have no idea how this works and copypasted the wrong one as my
template :-)

Will fix.
-Daniel

> 
> 
> >  option('build_runner',
> >         type : 'combo',
> >         value : 'auto',
> > -- 
> > 2.19.1
> > 
> > _______________________________________________
> > igt-dev mailing list
> > igt-dev@lists.freedesktop.org
> > https://lists.freedesktop.org/mailman/listinfo/igt-dev

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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