Allow soname to be an arbitrary string and fix symlink generation.

mesonbuild/backend/ninjabackend.py

@@ -2004,14 +2004,21 @@ rule FORTRAN_DEP_HACK
     def generate_shlib_aliases(self, target, outdir):
         basename = target.get_filename()
         aliases = target.get_aliaslist()
-        for alias in aliases:
+        for i, alias in enumerate(aliases):
             aliasfile = os.path.join(self.environment.get_build_dir(), outdir, alias)
             try:
                 os.remove(aliasfile)
             except Exception:
                 pass
+            # If both soversion and version are set and to different values,
+            # the .so symlink must point to the soversion symlink rather than the
+            # original file.
+            if i == 0 and len(aliases) > 1:
+                pointed_to_filename = aliases[1]
+            else:
+                pointed_to_filename = basename
             try:
-                os.symlink(basename, aliasfile)
+                os.symlink(pointed_to_filename, aliasfile)
             except NotImplementedError:
                 mlog.debug("Library versioning disabled because symlinks are not supported.")
             except OSError:

mesonbuild/build.py

@@ -1070,12 +1070,10 @@ class SharedLibrary(BuildTarget):
                 self.soversion = str(self.soversion)
             if not isinstance(self.soversion, str):
                 raise InvalidArguments('Shared library soversion is not a string or integer.')
-            try:
-                int(self.soversion)
-            except ValueError:
-                raise InvalidArguments('Shared library soversion must be a valid integer')
         elif self.ltversion:
             # library version is defined, get the soversion from that
+            # We replicate what Autotools does here and take the first
+            # number of the version by default.
             self.soversion = self.ltversion.split('.')[0]
         # Visual Studio module-definitions file
         if 'vs_module_defs' in kwargs:

run_unittests.py

@@ -215,8 +215,7 @@ class LinuxlikeTests(unittest.TestCase):
 
     def test_soname(self):
         testdir = os.path.join(self.unit_test_dir, '1 soname')
-        subprocess.check_call(['cmake', '-DCMAKE_BUILD_TYPE=debug', '-G', 'Ninja', testdir],
+        self.init(testdir)
-                              cwd=self.builddir, stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
         self.build()
 
         # File without aliases set.
@@ -229,9 +228,9 @@ class LinuxlikeTests(unittest.TestCase):
         # File with version set
         verset = os.path.join(self.builddir, 'libverset.so')
         self.assertTrue(os.path.exists(verset + '.4.5.6'))
-        self.assertEqual(os.readlink(verset), 'libverset.so.4.5.6')
+        self.assertEqual(os.readlink(verset), 'libverset.so.4')
-        self.assertEqual(self.get_soname(verset), 'libverset.so.4.5.6')
+        self.assertEqual(self.get_soname(verset), 'libverset.so.4')
-        self.assertEqual(len(glob(verset[:-3] + '*')), 2)
+        self.assertEqual(len(glob(verset[:-3] + '*')), 3)
 
         # File with soversion set
         soverset = os.path.join(self.builddir, 'libsoverset.so')

test cases/unit/1 soname/CMakeLists.txt

@@ -1,3 +1,11 @@
+# This is a CMake version of this test. It behaves slightly differently
+# so in case you ever need to debug this, here it is.
+#
+# The biggest difference is that if SOVERSION is not set, it
+# is set to VERSION. Autotools sets it to the first number
+# of VERSION. That is, for version number 1.2.3 CMake sets
+# soname to 1.2.3 but Autotools sets it to 1.
+
 project(vertest C)
 cmake_minimum_required(VERSION 3.5)
 

test cases/unit/1 soname/meson.build

@@ -0,0 +1,18 @@
+project('vertest', 'c')
+
+shared_library('nover', 'versioned.c')
+
+shared_library('verset', 'versioned.c',
+ version : '4.5.6')
+
+shared_library('soverset', 'versioned.c',
+ soversion : '1.2.3')
+
+shared_library('bothset', 'versioned.c',
+ soversion : '1.2.3',
+ version : '4.5.6')
+
+shared_library('settosame', 'versioned.c',
+  soversion : '7.8.9',
+  version : '7.8.9')
+