ninjabackend: Add support for installing .pdb files

.pdb files are files created by MSVC which have debug symbols. These are
created when /ZI or /Zi is passed to the compiler and /DEBUG to the
linker.

mesonbuild/backend/backends.py

@@ -118,6 +118,12 @@ class Backend():
             return os.path.join(self.get_target_dir(target), target.get_filename())
         raise AssertionError('BUG: Tried to link to something that\'s not a library')
 
+    def get_target_debug_filename(self, target):
+        fname = target.get_debug_filename()
+        if not fname:
+            raise AssertionError("BUG: Tried to generate debug filename when it doesn't exist")
+        return os.path.join(self.get_target_dir(target), fname)
+
     def get_target_dir(self, target):
         if self.environment.coredata.get_builtin_option('layout') == 'mirror':
             dirname = target.get_subdir()

mesonbuild/backend/ninjabackend.py

@@ -523,6 +523,13 @@ int dummy;
                 else:
                     # XXX: Add BuildTarget-specific install dir cases here
                     outdir = self.environment.get_libdir()
+                if isinstance(t, build.SharedLibrary) or isinstance(t, build.Executable):
+                    if t.get_debug_filename():
+                        # Install the debug symbols file in the same place as
+                        # the target itself. It has no aliases, should not be
+                        # stripped, and doesn't have an install_rpath
+                        i = [self.get_target_debug_filename(t), outdir, [], False, '']
+                        d.targets.append(i)
                 i = [self.get_target_filename(t), outdir, t.get_aliaslist(),\
                     should_strip, t.install_rpath]
                 d.targets.append(i)

mesonbuild/build.py

@@ -205,6 +205,8 @@ class BuildTarget():
         self.link_targets = []
         self.link_depends = []
         self.filename = 'no_name'
+        # The file with debugging symbols
+        self.debug_filename = None
         self.need_install = False
         self.pch = {}
         self.extra_args = {}
@@ -466,6 +468,15 @@ class BuildTarget():
     def get_filename(self):
         return self.filename
 
+    def get_debug_filename(self):
+        """
+        The name of the file that contains debugging symbols for this target
+
+        Returns None if there are no debugging symbols or if they are embedded
+        in the filename itself
+        """
+        return self.debug_filename
+
     def get_extra_args(self, language):
         return self.extra_args.get(language, [])
 
@@ -708,6 +719,11 @@ class Executable(BuildTarget):
         self.filename = self.name
         if self.suffix:
             self.filename += '.' + self.suffix
+        # See determine_debug_filenames() in build.SharedLibrary
+        buildtype = environment.coredata.get_builtin_option('buildtype')
+        if compiler_is_msvc(self.sources, is_cross, environment) and \
+           buildtype.startswith('debug'):
+            self.debug_filename = self.prefix + self.name + '.pdb'
 
     def type_suffix(self):
         return "@exe"
@@ -733,6 +749,11 @@ class StaticLibrary(BuildTarget):
             else:
                 self.suffix = 'a'
         self.filename = self.prefix + self.name + '.' + self.suffix
+        # See determine_debug_filenames() in build.SharedLibrary
+        buildtype = environment.coredata.get_builtin_option('buildtype')
+        if compiler_is_msvc(self.sources, is_cross, environment) and \
+           buildtype.startswith('debug'):
+            self.debug_filename = self.prefix + self.name + '.pdb'
 
     def type_suffix(self):
         return "@sta"
@@ -755,6 +776,7 @@ class SharedLibrary(BuildTarget):
             self.suffix = None
         self.basic_filename_tpl = '{0.prefix}{0.name}.{0.suffix}'
         self.determine_filenames(is_cross, environment)
+        self.determine_debug_filenames(is_cross, environment)
 
     def determine_filenames(self, is_cross, env):
         """
@@ -846,6 +868,21 @@ class SharedLibrary(BuildTarget):
             self.suffix = suffix
         self.filename = self.filename_tpl.format(self)
 
+    def determine_debug_filenames(self, is_cross, env):
+        """
+        Determine the debug filename(s) using the prefix/name/etc detected in
+        determine_filenames() above.
+        """
+        buildtype = env.coredata.get_builtin_option('buildtype')
+        if compiler_is_msvc(self.sources, is_cross, env) and buildtype.startswith('debug'):
+            # Currently we only implement separate debug symbol files for MSVC
+            # since the toolchain does it for us. Other toolchains embed the
+            # debugging symbols in the file itself by default.
+            if self.soversion:
+                self.debug_filename = '{0.prefix}{0.name}-{0.soversion}.pdb'.format(self)
+            else:
+                self.debug_filename = '{0.prefix}{0.name}.pdb'.format(self)
+
     def process_kwargs(self, kwargs, environment):
         super().process_kwargs(kwargs, environment)
         # Shared library version