1 files changed, 73 insertions, 0 deletions
diff --git a/gfx/harfbuzz/src/check-symbols.py b/gfx/harfbuzz/src/check-symbols.py
new file mode 100755
index 0000000000..c366dc0aaf
--- /dev/null
+++ b/gfx/harfbuzz/src/check-symbols.py
@@ -0,0 +1,73 @@
+#!/usr/bin/env python3
+
+import sys, os, shutil, subprocess, re, difflib
+
+os.environ['LC_ALL'] = 'C' # otherwise 'nm' prints in wrong order
+
+builddir = os.getenv ('builddir', os.path.dirname (__file__))
+libs = os.getenv ('libs', '.libs')
+
+IGNORED_SYMBOLS = '|'.join(['_fini', '_init', '_fdata', '_ftext', '_fbss',
+	'__bss_start', '__bss_start__', '__bss_end__', '_edata', '_end', '_bss_end__',
+	'__end__', '__gcov_.*', 'llvm_.*', 'flush_fn_list', 'writeout_fn_list', 'mangle_path'])
+
+nm = shutil.which ('nm')
+if not nm:
+	print ('check-symbols.py: \'nm\' not found; skipping test')
+	sys.exit (77)
+
+cxxflit = shutil.which ('c++filt')
+
+tested = False
+stat = 0
+
+for soname in ['harfbuzz', 'harfbuzz-subset', 'harfbuzz-icu', 'harfbuzz-gobject']:
+	for suffix in ['so', 'dylib']:
+		so = os.path.join (builddir, libs, 'lib%s.%s' % (soname, suffix))
+		if not os.path.exists (so): continue
+
+		# On macOS, C symbols are prefixed with _
+		symprefix = '_' if suffix == 'dylib' else ''
+
+		EXPORTED_SYMBOLS = [s.split ()[2]
+							for s in re.findall (r'^.+ [BCDGIRST] .+$', subprocess.check_output ([nm, so]).decode ('utf-8'), re.MULTILINE)
+							if not re.match (r'.* %s(%s)\b' % (symprefix, IGNORED_SYMBOLS), s)]
+
+		# run again c++flit also if is available
+		if cxxflit:
+			EXPORTED_SYMBOLS = subprocess.check_output (
+				[cxxflit], input='\n'.join (EXPORTED_SYMBOLS).encode ()
+			).decode ('utf-8').splitlines ()
+
+		prefix = (symprefix + os.path.basename (so)).replace ('libharfbuzz', 'hb').replace ('-', '_').split ('.')[0]
+
+		print ('Checking that %s does not expose internal symbols' % so)
+		suspicious_symbols = [x for x in EXPORTED_SYMBOLS if not re.match (r'^%s(_|$)' % prefix, x)]
+		if suspicious_symbols:
+			print ('Ouch, internal symbols exposed:', suspicious_symbols)
+			stat = 1
+
+		def_path = os.path.join (builddir, soname + '.def')
+		if not os.path.exists (def_path):
+			print ('\'%s\' not found; skipping' % def_path)
+		else:
+			print ('Checking that %s has the same symbol list as %s' % (so, def_path))
+			with open (def_path, 'r', encoding='utf-8') as f: def_file = f.read ()
+			diff_result = list (difflib.context_diff (
+				def_file.splitlines (),
+				['EXPORTS'] + [re.sub ('^%shb' % symprefix, 'hb', x) for x in EXPORTED_SYMBOLS] +
+					# cheat: copy the last line from the def file!
+					[def_file.splitlines ()[-1]]
+			))
+
+			if diff_result:
+				print ('\n'.join (diff_result))
+				stat = 1
+
+			tested = True
+
+if not tested:
+	print ('check-symbols.sh: no shared libraries found; skipping test')
+	sys.exit (77)
+
+sys.exit (stat)