Solaris fixes

Fixes #5351

mesonbuild/compilers/compilers.py

@@ -1979,6 +1979,8 @@ class GnuLikeCompiler(abc.ABC):
         elif self.compiler_type.is_windows_compiler:
             # For PE/COFF this is impossible
             return []
+        elif mesonlib.is_sunos():
+            return []
         else:
             # GNU ld and LLVM lld
             return ['-Wl,--allow-shlib-undefined']

mesonbuild/environment.py

@@ -1222,6 +1222,8 @@ class Environment:
                 return ArLinker(linker)
             if p.returncode == 1 and err.startswith('Usage'): # AIX
                 return ArLinker(linker)
+            if p.returncode == 1 and err.startswith('ar: bad option: --'): # Solaris
+                return ArLinker(linker)
         self._handle_exceptions(popen_exceptions, linkers, 'linker')
         raise EnvironmentException('Unknown static linker "%s"' % ' '.join(linkers))