meson: add opt-out of libunwind

Libunwind has some issues on some platforms, so let's allow people
who have issues to opt-out. This is similar to what we do in automake,
and the implementation is modelled after our opt-out for valgrind.

Signed-off-by: Erik Faye-Lund <kusmabite@gmail.com>
Reviewed-by: Dylan Baker <dylan@pnwbakers.com>

meson.build

@@ -37,6 +37,7 @@ pre_args = [
 with_vulkan_icd_dir = get_option('vulkan-icd-dir')
 with_tests = get_option('build-tests')
 with_valgrind = get_option('valgrind')
+with_libunwind = get_option('libunwind')
 with_asm = get_option('asm')
 with_llvm = get_option('llvm')
 if get_option('texture-float')
@@ -687,7 +688,7 @@ dep_selinux = []
 # TODO: llvm-prefix and llvm-shared-libs
 
 dep_unwind = dependency('libunwind', required : false)
-if dep_unwind.found()
+if dep_unwind.found() and with_libunwind
   pre_args += '-DHAVE_LIBUNWIND'
 endif
 

meson_options.txt

@@ -142,6 +142,12 @@ option(
   value : true,
   description : 'Build with valgrind support if possible'
 )
+option(
+  'libunwind',
+  type : 'boolean',
+  value : true,
+  description : 'Use libunwind for stack-traces if possible'
+)
 option(
   'build-tests',
   type : 'boolean',