LLVMBuild: Introduce a common section which currently has a list of the

subdirectories to traverse into.
 - Originally I wanted to avoid this and just autoscan, but this has one key
   flaw in that new subdirectories can not automatically trigger a rerun of the
   llvm-build tool. This is particularly a pain when switching back and forth
   between trees where one has added a subdirectory, as the dependencies will
   tend to be wrong. This will also eliminates FIXME implicitly.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146436 91177308-0d34-0410-b5e6-96231b3b80d8

LLVMBuild.txt

@@ -15,6 +15,9 @@
 ;
 ;===------------------------------------------------------------------------===;
 
+[common]
+subdirectories = bindings docs examples lib projects runtime tools utils
+
 [component_0]
 type = Group
 name = Miscellaneous

lib/Analysis/LLVMBuild.txt

@@ -15,6 +15,9 @@
 ;
 ;===------------------------------------------------------------------------===;
 
+[common]
+subdirectories = IPA
+
 [component_0]
 type = Library
 name = Analysis

lib/Bitcode/LLVMBuild.txt

@@ -15,6 +15,9 @@
 ;
 ;===------------------------------------------------------------------------===;
 
+[common]
+subdirectories = Reader Writer
+
 [component_0]
 type = Group
 name = Bitcode

lib/CodeGen/LLVMBuild.txt

@@ -15,6 +15,9 @@
 ;
 ;===------------------------------------------------------------------------===;
 
+[common]
+subdirectories = AsmPrinter SelectionDAG
+
 [component_0]
 type = Library
 name = CodeGen

lib/ExecutionEngine/LLVMBuild.txt

@@ -15,6 +15,9 @@
 ;
 ;===------------------------------------------------------------------------===;
 
+[common]
+subdirectories = Interpreter JIT MCJIT RuntimeDyld
+
 [component_0]
 type = Library
 name = ExecutionEngine

lib/LLVMBuild.txt

@@ -15,6 +15,9 @@
 ;
 ;===------------------------------------------------------------------------===;
 
+[common]
+subdirectories = Analysis Archive AsmParser Bitcode CodeGen DebugInfo ExecutionEngine Linker MC Object Support TableGen Target Transforms VMCore
+
 [component_0]
 type = Group
 name = Libraries

lib/MC/LLVMBuild.txt

@@ -15,6 +15,9 @@
 ;
 ;===------------------------------------------------------------------------===;
 
+[common]
+subdirectories = MCDisassembler MCParser
+
 [component_0]
 type = Library
 name = MC

lib/Target/ARM/LLVMBuild.txt

@@ -15,6 +15,9 @@
 ;
 ;===------------------------------------------------------------------------===;
 
+[common]
+subdirectories = AsmParser Disassembler InstPrinter MCTargetDesc TargetInfo
+
 [component_0]
 type = TargetGroup
 name = ARM

lib/Target/CBackend/LLVMBuild.txt

@@ -15,6 +15,9 @@
 ;
 ;===------------------------------------------------------------------------===;
 
+[common]
+subdirectories = TargetInfo
+
 [component_0]
 type = TargetGroup
 name = CBackend

lib/Target/CellSPU/LLVMBuild.txt

@@ -15,6 +15,9 @@
 ;
 ;===------------------------------------------------------------------------===;
 
+[common]
+subdirectories = MCTargetDesc TargetInfo
+
 [component_0]
 type = TargetGroup
 name = CellSPU

lib/Target/CppBackend/LLVMBuild.txt

@@ -15,6 +15,9 @@
 ;
 ;===------------------------------------------------------------------------===;
 
+[common]
+subdirectories = TargetInfo
+
 [component_0]
 type = TargetGroup
 name = CppBackend

lib/Target/Hexagon/LLVMBuild.txt

@@ -1,4 +1,4 @@
-;===- ./lib/Target/Hexagon/LLVMBuild.txt ----------------------*- Conf -*--===;
+;===- ./lib/Target/Hexagon/LLVMBuild.txt -----------------------*- Conf -*--===;
 ;
 ;                     The LLVM Compiler Infrastructure
 ;
@@ -15,6 +15,9 @@
 ;
 ;===------------------------------------------------------------------------===;
 
+[common]
+subdirectories = TargetInfo
+
 [component_0]
 type = TargetGroup
 name = Hexagon
@@ -27,4 +30,3 @@ name = HexagonCodeGen
 parent = Hexagon
 required_libraries = AsmPrinter CodeGen Core HexagonInfo SelectionDAG Support Target MC
 add_to_library_groups = Hexagon
-

lib/Target/Hexagon/TargetInfo/LLVMBuild.txt

@@ -21,4 +21,3 @@ name = HexagonInfo
 parent = Hexagon
 required_libraries = MC Support
 add_to_library_groups = Hexagon
-

lib/Target/LLVMBuild.txt

@@ -15,6 +15,9 @@
 ;
 ;===------------------------------------------------------------------------===;
 
+[common]
+subdirectories = ARM CBackend CellSPU CppBackend Hexagon MBlaze MSP430 Mips PTX PowerPC Sparc X86 XCore
+
 ; This is a special group whose required libraries are extended (by llvm-build)
 ; with the best execution engine (the native JIT, if available, or the
 ; interpreter).

lib/Target/MBlaze/LLVMBuild.txt

@@ -15,6 +15,9 @@
 ;
 ;===------------------------------------------------------------------------===;
 
+[common]
+subdirectories = AsmParser Disassembler InstPrinter MCTargetDesc TargetInfo
+
 [component_0]
 type = TargetGroup
 name = MBlaze

lib/Target/MSP430/LLVMBuild.txt

@@ -15,6 +15,9 @@
 ;
 ;===------------------------------------------------------------------------===;
 
+[common]
+subdirectories = InstPrinter MCTargetDesc TargetInfo
+
 [component_0]
 type = TargetGroup
 name = MSP430

lib/Target/Mips/LLVMBuild.txt

@@ -15,6 +15,9 @@
 ;
 ;===------------------------------------------------------------------------===;
 
+[common]
+subdirectories = InstPrinter MCTargetDesc TargetInfo
+
 [component_0]
 type = TargetGroup
 name = Mips

lib/Target/PTX/LLVMBuild.txt

@@ -15,6 +15,9 @@
 ;
 ;===------------------------------------------------------------------------===;
 
+[common]
+subdirectories = InstPrinter MCTargetDesc TargetInfo
+
 [component_0]
 type = TargetGroup
 name = PTX

lib/Target/PowerPC/LLVMBuild.txt

@@ -15,6 +15,9 @@
 ;
 ;===------------------------------------------------------------------------===;
 
+[common]
+subdirectories = InstPrinter MCTargetDesc TargetInfo
+
 [component_0]
 type = TargetGroup
 name = PowerPC

lib/Target/Sparc/LLVMBuild.txt

@@ -15,6 +15,9 @@
 ;
 ;===------------------------------------------------------------------------===;
 
+[common]
+subdirectories = MCTargetDesc TargetInfo
+
 [component_0]
 type = TargetGroup
 name = Sparc

lib/Target/X86/LLVMBuild.txt

@@ -15,6 +15,9 @@
 ;
 ;===------------------------------------------------------------------------===;
 
+[common]
+subdirectories = AsmParser Disassembler InstPrinter MCTargetDesc TargetInfo Utils
+
 [component_0]
 type = TargetGroup
 name = X86

lib/Target/XCore/LLVMBuild.txt

@@ -15,6 +15,9 @@
 ;
 ;===------------------------------------------------------------------------===;
 
+[common]
+subdirectories = MCTargetDesc TargetInfo
+
 [component_0]
 type = TargetGroup
 name = XCore

lib/Transforms/LLVMBuild.txt

@@ -15,6 +15,9 @@
 ;
 ;===------------------------------------------------------------------------===;
 
+[common]
+subdirectories = IPO InstCombine Instrumentation Scalar Utils
+
 [component_0]
 type = Group
 name = Transforms

tools/LLVMBuild.txt

@@ -15,6 +15,9 @@
 ;
 ;===------------------------------------------------------------------------===;
 
+[common]
+subdirectories = bugpoint llc lli llvm-ar llvm-as llvm-bcanalyzer llvm-cov llvm-diff llvm-dis llvm-dwarfdump llvm-extract llvm-ld llvm-link llvm-mc llvm-nm llvm-objdump llvm-prof llvm-ranlib llvm-rtdyld llvm-size llvm-stub macho-dump opt
+
 [component_0]
 type = Group
 name = Tools

utils/LLVMBuild.txt

@@ -15,6 +15,9 @@
 ;
 ;===------------------------------------------------------------------------===;
 
+[common]
+subdirectories = TableGen unittest
+
 [component_0]
 type = Group
 name = BuildTools

utils/llvm-build/llvmbuild/main.py

@@ -214,14 +214,45 @@ class LLVMProjectInfo(object):
 
             info_basedir[ci.subpath] = info_basedir.get(ci.subpath, []) + [ci]
 
+        # Compute the list of subdirectories to scan.
+        subpath_subdirs = {}
+        for ci in self.component_infos:
+            # Ignore root components.
+            if ci.subpath == '/':
+                continue
+
+            # Otherwise, append this subpath to the parent list.
+            parent_path = os.path.dirname(ci.subpath)
+            subpath_subdirs[parent_path] = parent_list = subpath_subdirs.get(
+                parent_path, set())
+            parent_list.add(os.path.basename(ci.subpath))
+
         # Generate the build files.
         for subpath, infos in info_basedir.items():
             # Order the components by name to have a canonical ordering.
             infos.sort(key = lambda ci: ci.name)
 
             # Format the components into llvmbuild fragments.
-            fragments = filter(None, [ci.get_llvmbuild_fragment()
+            fragments = []
-                                      for ci in infos])
+
+            # Add the common fragments.
+            subdirectories = subpath_subdirs.get(subpath)
+            if subdirectories:
+                fragment = """\
+subdirectories = %s
+""" % (" ".join(sorted(subdirectories)),)
+                fragments.append(("common", fragment))
+
+            # Add the component fragments.
+            num_common_fragments = len(fragments)
+            for ci in infos:
+                fragment = ci.get_llvmbuild_fragment()
+                if fragment is None:
+                    continue
+
+                name = "component_%d" % (len(fragments) - num_common_fragments)
+                fragments.append((name, fragment))
+
             if not fragments:
                 continue
 
@@ -242,7 +273,7 @@ class LLVMProjectInfo(object):
                 if ln.startswith(';'):
                     comment_block += ln
                 elif ln.startswith('[') and ln.endswith(']\n'):
-                    comments_map[ln[:-1]] = comment_block
+                    comments_map[ln[1:-2]] = comment_block
                 else:
                     comment_block = ""
             f.close()
@@ -275,15 +306,16 @@ class LLVMProjectInfo(object):
 ;===------------------------------------------------------------------------===;
 """ % header_string
 
-            for i,fragment in enumerate(fragments):
+            # Write out each fragment.each component fragment.
-                name = '[component_%d]' % i
+            for name,fragment in fragments:
                 comment = comments_map.get(name)
                 if comment is not None:
                     f.write(comment)
-                print >>f, name
+                print >>f, "[%s]" % name
                 f.write(fragment)
-                if fragment is not fragments[-1]:
+                if fragment is not fragments[-1][1]:
                     print >>f
+
             f.close()
 
     def write_library_table(self, output_path):