Rpaths start working.

backends.py

@@ -225,7 +225,6 @@ class Backend():
             if compiler.id == 'msvc':
                 if fname.endswith('dll'):
                     fname = fname[:-3] + 'lib'
-            fname = os.path.join('.', fname) # Hack to make ldd find the library.
             args.append(fname)
         return args
 
@@ -852,6 +851,7 @@ class NinjaBackend(Backend):
         elif isinstance(target, build.SharedLibrary):
             commands += linker.get_std_shared_lib_link_flags()
             commands += linker.get_pic_flags()
+            commands += linker.get_soname_flags(target.name)
         elif isinstance(target, build.StaticLibrary):
             commands += linker.get_std_link_flags()
         else:
@@ -860,6 +860,7 @@ class NinjaBackend(Backend):
             commands += dep.get_link_flags()
         dependencies = target.get_dependencies()
         commands += self.build_target_link_arguments(linker, dependencies)
+        commands.append(linker.build_rpath_arg(self.environment.get_build_dir(), target.get_rpaths()))
         if self.environment.coredata.coverage:
             commands += linker.get_coverage_link_flags()
         dep_targets = [self.get_dependency_filename(t) for t in dependencies]

build.py

@@ -143,6 +143,15 @@ class BuildTarget():
                     newd.append(i)
             self.kwargs['deps'] = newd
 
+    def get_rpaths(self):
+        return self.get_transitive_rpaths()
+
+    def get_transitive_rpaths(self):
+        result = []
+        for i in self.link_targets:
+            result += i.get_rpaths()
+        return result
+
     def process_kwargs(self, kwargs):
         self.copy_kwargs(kwargs)
         kwargs.get('modules', [])
@@ -404,6 +413,9 @@ class SharedLibrary(BuildTarget):
     def get_shbase(self):
         return self.prefix + self.name + '.' + self.suffix
 
+    def get_rpaths(self):
+        return [self.subdir] + self.get_transitive_rpaths()
+
     def get_filename(self):
         fname = self.get_shbase()
         if self.version is None:

depfixer.py

@@ -187,6 +187,17 @@ class Elf():
         self.bf.seek(strtab.val + soname.val)
         print(self.read_str())
 
+    def get_rpath_offset(self):
+        sec = self.find_section(b'.dynstr')
+        for i in self.dynamic:
+            if i.d_tag == DT_RPATH:
+                rpath = i
+        return sec.sh_offset + rpath.val
+
+    def print_rpath(self):
+        self.bf.seek(self.get_rpath_offset())
+        print(self.read_str())
+
     def print_deps(self):
         sec = self.find_section(b'.dynstr')
         deps = []
@@ -217,14 +228,26 @@ class Elf():
                 self.bf.seek(offset)
                 self.bf.write(newname)
 
+    def fix_rpath(self, new_rpath):
+        rp_off = self.get_rpath_offset()
+        self.bf.seek(rp_off)
+        old_rpath = self.read_str()
+        if len(old_rpath) < len(new_rpath):
+            print("New rpath must not be longer than the old one.")
+        self.bf.seek(rp_off)
+        self.bf.write(new_rpath)
+        self.bf.write(b'\0'*(len(old_rpath) - len(new_rpath) + 1))
 
 if __name__ == '__main__':
-    if len(sys.argv) != 3:
-        print('This application converts absolute dep paths to relative ones.')
+    if len(sys.argv) < 2 or len(sys.argv) > 3:
+        print('This application resets target rpath.')
         print('Don\'t run this unless you know what you are doing.')
         print('%s: <binary file> <prefix>' % sys.argv[0])
         exit(1)
     e = Elf(sys.argv[1])
-    prefix = sys.argv[2]
-    #e.print_deps()
-    e.fix_deps(prefix.encode())
+    if len(sys.argv) == 2:
+        e.print_rpath()
+    else:
+        new_rpath = sys.argv[2]
+        e.fix_rpath(new_rpath.encode('utf8'))
+    #e.fix_deps(prefix.encode())

environment.py

@@ -56,6 +56,15 @@ class CCompiler():
     def get_always_flags(self):
         return []
 
+    def get_soname_flags(self, shlib_name):
+        return []
+
+    def split_shlib_to_parts(self, fname):
+        return (None, fname)
+
+    def build_rpath_arg(self, build_dir, rpath_paths):
+        return ''
+
     def get_id(self):
         return self.id
 
@@ -503,6 +512,15 @@ class GnuCCompiler(CCompiler):
     def get_pch_suffix(self):
         return 'gch'
 
+    def split_shlib_to_parts(self, fname):
+        return (os.path.split(fname)[0], fname)
+
+    def build_rpath_arg(self, build_dir, rpath_paths):
+        return '-Wl,-rpath,' + ':'.join([os.path.join(build_dir, p) for p in rpath_paths])
+
+    def get_soname_flags(self, shlib_name):
+        return ['-Wl,-soname,lib%s.so' % shlib_name]
+
 class GnuObjCCompiler(ObjCCompiler):
     std_warn_flags = ['-Wall', '-Winvalid-pch']
     std_opt_flags = ['-O2']

test cases/common/46 library chain/main.c

@@ -0,0 +1,5 @@
+int libfun();
+
+int main() {
+  return libfun();
+}

test cases/common/46 library chain/meson.build

@@ -0,0 +1,5 @@
+project('libchain', 'c')
+
+subdir('subdir')
+e = executable('prog', 'main.c', link_with : lib1)
+test('tst', e)

test cases/common/46 library chain/subdir/lib1.c

@@ -0,0 +1,6 @@
+int lib2fun();
+int lib3fun();
+
+int libfun() {
+  return lib2fun() + lib3fun();
+}

test cases/common/46 library chain/subdir/meson.build

@@ -0,0 +1,4 @@
+subdir('subdir2')
+subdir('subdir3')
+
+lib1 = shared_library('lib1', 'lib1.c', link_with : [lib2, lib3])

test cases/common/46 library chain/subdir/subdir2/lib2.c

@@ -0,0 +1,3 @@
+int lib2fun() {
+  return 0;
+}

test cases/common/46 library chain/subdir/subdir2/meson.build

@@ -0,0 +1 @@
+lib2 = shared_library('lib2', 'lib2.c')

test cases/common/46 library chain/subdir/subdir3/lib3.c

@@ -0,0 +1,3 @@
+int lib3fun()  {
+  return 0;
+}

test cases/common/46 library chain/subdir/subdir3/meson.build

@@ -0,0 +1 @@
+lib3 = shared_library('lib3', 'lib3.c')