meson: Add blacklist when compiling with tsan

Check whether the compiler actually supports it and if
not than warn about it. Note that meson will also
suggest that one should use the build-in flag, but this
is just sloppy testing for -fsanitize, -fsanitize-blacklist
is actually not available as build-in option.

v2: define THREAD_SANITIZER to 1 or 0 (suggested by Yonggang Luo)
v3: Update comment about meson warning (Dylan Baker)

Signed-off-by: Gert Wollny <gert.wollny@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/28650>

meson.build

@@ -1909,6 +1909,23 @@ else
   asan_c_args = ['-DBUILT_WITH_ASAN=0']
 endif
 
+# ThreadSanitizer can't deal with futexes, and reports races for cases we don't care about
+# so add a define to work silence these issues.
+if get_option('b_sanitize') == 'thread'
+  pre_args += '-DTHREAD_SANITIZER=1'
+  # meson versions prior to 1.4 will warn "Consider using the built-in option for sanitizers ..." 
+  # later on because it only checks whether the option starts with "-fsanitize",
+  # but there is no built-in option for adding a blacklist
+  tsan_blacklist = '-fsanitize-blacklist=@0@'.format(join_paths(meson.project_source_root(), 'tsan-blacklist.txt'))
+  if cc.has_argument(tsan_blacklist)
+    pre_args += tsan_blacklist
+  else
+    warning('Compiler does not support "-fsanitize-blacklist", expected race conditions will not be surpressed')
+  endif
+else
+  pre_args += '-DTHREAD_SANITIZER=0'
+endif
+
 yacc_is_bison = true
 needs_flex_bison = with_any_opengl or with_freedreno_vk or with_intel_tools or with_gallium
 

tsan-blacklist.txt

@@ -0,0 +1,2 @@
+# Placeholder file, will be filled with surpressions for TSAN 
+