From b88536173b6ca2e79d8837bed62b9452920a319e Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Mon, 31 Mar 2014 16:22:27 -0400
Subject: castxml: Report help with '-help' and '--help'

Also pass the flag through so Clang reports its help too.
---
 src/castxml.cxx                  | 15 +++++++++++++++
 test/CMakeLists.txt              |  2 ++
 test/expect/cmd.help1-stderr.txt |  1 +
 test/expect/cmd.help1-stdout.txt |  7 +++++++
 test/expect/cmd.help2-stderr.txt |  1 +
 test/expect/cmd.help2-stdout.txt |  7 +++++++
 6 files changed, 33 insertions(+)
 create mode 100644 test/expect/cmd.help1-stderr.txt
 create mode 100644 test/expect/cmd.help1-stdout.txt
 create mode 100644 test/expect/cmd.help2-stderr.txt
 create mode 100644 test/expect/cmd.help2-stdout.txt

diff --git a/src/castxml.cxx b/src/castxml.cxx
index 8f496d0..cf6fb27 100644
--- a/src/castxml.cxx
+++ b/src/castxml.cxx
@@ -85,6 +85,9 @@ int main(int argc_in, const char** argv_in)
     "  --castxml-start <name>\n"
     "    Start AST traversal at declaration with given (qualified) name\n"
     "\n"
+    "  -help, --help\n"
+    "    Print castxml and internal Clang compiler usage information\n"
+    "\n"
     "  -o <file>\n"
     "    Write output to <file>\n"
     "\n"
@@ -194,6 +197,18 @@ int main(int argc_in, const char** argv_in)
           ;
         return 1;
       }
+    } else if(strcmp(argv[i], "-help") == 0 ||
+              strcmp(argv[i], "--help") == 0) {
+      std::cout <<
+        usage <<
+        "\n"
+        "Help for the internal Clang compiler appears below.\n"
+        "\n"
+        "---------------------------------------------------------------"
+        "\n" <<
+        std::endl;
+      // Also print Clang help.
+      clang_args.push_back(argv[i]);
     } else if(strcmp(argv[i], "--version") == 0) {
       std::cout << "castxml version " << getVersionString() << std::endl;
       // Also print Clang version.
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index 6d3d8a9..19c00dc 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -63,6 +63,8 @@ set(empty_cxx ${input}/empty.cxx)
 set(empty_m ${input}/empty.m)
 set(empty_mm ${input}/empty.mm)
 
+castxml_test_cmd(help1 -help)
+castxml_test_cmd(help2 --help)
 castxml_test_cmd(no-arguments)
 castxml_test_cmd(version --version)
 
diff --git a/test/expect/cmd.help1-stderr.txt b/test/expect/cmd.help1-stderr.txt
new file mode 100644
index 0000000..10f3293
--- /dev/null
+++ b/test/expect/cmd.help1-stderr.txt
@@ -0,0 +1 @@
+^$
diff --git a/test/expect/cmd.help1-stdout.txt b/test/expect/cmd.help1-stdout.txt
new file mode 100644
index 0000000..9b47306
--- /dev/null
+++ b/test/expect/cmd.help1-stdout.txt
@@ -0,0 +1,7 @@
+^Usage: castxml .*
+
+Help for the internal Clang compiler appears below.
+
+---------------------------------------------------------------
+
+OVERVIEW: clang LLVM compiler
diff --git a/test/expect/cmd.help2-stderr.txt b/test/expect/cmd.help2-stderr.txt
new file mode 100644
index 0000000..10f3293
--- /dev/null
+++ b/test/expect/cmd.help2-stderr.txt
@@ -0,0 +1 @@
+^$
diff --git a/test/expect/cmd.help2-stdout.txt b/test/expect/cmd.help2-stdout.txt
new file mode 100644
index 0000000..9b47306
--- /dev/null
+++ b/test/expect/cmd.help2-stdout.txt
@@ -0,0 +1,7 @@
+^Usage: castxml .*
+
+Help for the internal Clang compiler appears below.
+
+---------------------------------------------------------------
+
+OVERVIEW: clang LLVM compiler
-- 
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