[flang] Add .clang-format and "make formatted" rule.

Original-commit: flang-compiler/f18@5ef28a6112

flang/.clang-format

@@ -0,0 +1,20 @@
+---
+# See: https://clang.llvm.org/docs/ClangFormatStyleOptions.html
+BasedOnStyle: LLVM
+SpacesBeforeTrailingComments: 2
+AlignEscapedNewlines: DontAlign
+AllowShortCaseLabelsOnASingleLine: true
+AllowShortIfStatementsOnASingleLine: true
+ConstructorInitializerIndentWidth: 2
+AlignAfterOpenBracket: AlwaysBreak
+AlignOperands: false
+AlignConsecutiveAssignments: false
+AlignConsecutiveDeclarations: false
+AlignTrailingComments: false
+SpaceAfterTemplateKeyword: false
+BreakBeforeBinaryOperators: All
+BreakBeforeTernaryOperators: true
+ContinuationIndentWidth: 2
+...
+
+# vim:set filetype=yaml:

flang/.gitignore

@@ -7,3 +7,4 @@ f18
 CMakeCache.txt
 CMakeFiles/*
 cmake_install.cmake
+formatted

flang/Makefile

@@ -51,3 +51,13 @@ parse-state.h: message.h position.h
 	@touch $@
 parse-tree.h: format-specification.h idioms.h indirection.h position.h
 	@touch $@
+
+
+CLANG_FORMAT=/proj/pgi/flang/x86_64/flang-dev/bin/clang-format
+formatted:
+	@mkdir -p formatted
+	@for x in *.h *.cc; do \
+		$(CLANG_FORMAT) < $$x > formatted/$$x; \
+	done
+
+.PHONY: formatted