backends: fix rpath match pattern

Since -Wl,-rpath= is not the only valid rpath ldflags syntax we
need to try and match all valid rpath ldflags.

In addition we should prevent -Wl,--just-symbols from being used to
set rpath due to inconsistent compiler support.

Signed-off-by: James Hilliard <james.hilliard1@gmail.com>

mesonbuild/backend/backends.py

@@ -14,6 +14,7 @@
 
 from collections import OrderedDict
 from functools import lru_cache
+from pathlib import Path
 import enum
 import json
 import os
@@ -455,10 +456,35 @@ class Backend:
                 args.extend(self.environment.coredata.get_external_link_args(target.for_machine, lang))
             except Exception:
                 pass
+        # Match rpath formats:
+        # -Wl,-rpath=
+        # -Wl,-rpath,
+        rpath_regex = re.compile(r'-Wl,-rpath[=,]([^,]+)')
+        # Match solaris style compat runpath formats:
+        # -Wl,-R
+        # -Wl,-R,
+        runpath_regex = re.compile(r'-Wl,-R[,]?([^,]+)')
+        # Match symbols formats:
+        # -Wl,--just-symbols=
+        # -Wl,--just-symbols,
+        symbols_regex = re.compile(r'-Wl,--just-symbols[=,]([^,]+)')
         for arg in args:
-            if arg.startswith('-Wl,-rpath='):
-                for dir in arg.replace('-Wl,-rpath=','').split(':'):
+            rpath_match = rpath_regex.match(arg)
+            if rpath_match:
+                for dir in rpath_match.group(1).split(':'):
                     dirs.add(dir)
+            runpath_match = runpath_regex.match(arg)
+            if runpath_match:
+                for dir in runpath_match.group(1).split(':'):
+                    # The symbols arg is an rpath if the path is a directory
+                    if Path(dir).is_dir():
+                        dirs.add(dir)
+            symbols_match = symbols_regex.match(arg)
+            if symbols_match:
+                for dir in symbols_match.group(1).split(':'):
+                    # Prevent usage of --just-symbols to specify rpath
+                    if Path(dir).is_dir():
+                        raise MesonException('Invalid arg for --just-symbols, {} is a directory.'.format(dir))
         return dirs
 
     def rpaths_for_bundled_shared_libraries(self, target, exclude_system=True):

run_unittests.py

@@ -6469,19 +6469,34 @@ class LinuxlikeTests(BasePlatformTests):
         self.init(yonder_dir)
         self.build()
         self.install(use_destdir=False)
-        self.new_builddir()
 
-        # Build an app that uses that installed library.
-        # Supply the rpath to the installed library via LDFLAGS
-        # (as systems like buildroot and guix are wont to do)
-        # and verify install preserves that rpath.
-        env = {'LDFLAGS': '-Wl,-rpath=' + yonder_libdir,
-               'PKG_CONFIG_PATH': os.path.join(yonder_libdir, 'pkgconfig')}
-        self.init(testdir, override_envvars=env)
-        self.build()
-        self.install(use_destdir=False)
-        got_rpath = get_rpath(os.path.join(yonder_prefix, 'bin/rpathified'))
-        self.assertEqual(got_rpath, yonder_libdir)
+        # Since rpath has multiple valid formats we need to
+        # test that they are all properly used.
+        rpath_formats = [
+            ('-Wl,-rpath=', False),
+            ('-Wl,-rpath,', False),
+            ('-Wl,--just-symbols=', True),
+            ('-Wl,--just-symbols,', True),
+            ('-Wl,-R', False),
+            ('-Wl,-R,', False)
+        ]
+        for rpath_format, exception in rpath_formats:
+            # Build an app that uses that installed library.
+            # Supply the rpath to the installed library via LDFLAGS
+            # (as systems like buildroot and guix are wont to do)
+            # and verify install preserves that rpath.
+            self.new_builddir()
+            env = {'LDFLAGS': rpath_format + yonder_libdir,
+                   'PKG_CONFIG_PATH': os.path.join(yonder_libdir, 'pkgconfig')}
+            if exception:
+                with self.assertRaises(subprocess.CalledProcessError):
+                    self.init(testdir, override_envvars=env)
+                break
+            self.init(testdir, override_envvars=env)
+            self.build()
+            self.install(use_destdir=False)
+            got_rpath = get_rpath(os.path.join(yonder_prefix, 'bin/rpathified'))
+            self.assertEqual(got_rpath, yonder_libdir, rpath_format)
 
     @skip_if_not_base_option('b_sanitize')
     def test_pch_with_address_sanitizer(self):