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揮発環境確認
$ xcodebuild -version
Xcode 4.3.2
Build version 4E2002
$ xcodebuild -showsdks
Mac OS X SDKs:
Mac OS X 10.6 -sdk macosx10.6
Mac OS X 10.7 -sdk macosx10.7

iOS SDKs:
iOS 5.1 -sdk iphoneos5.1

iOS Simulator SDKs:
Simulator - iOS 4.3 -sdk iphonesimulator4.3
Simulator - iOS 5.0 -sdk iphonesimulator5.0
Simulator - iOS 5.1 -sdk iphonesimulator5.1

xcode3.2の環境は　switchしないとダメみたい

//--- source code sample1.mm start ---
#import <Foundation/Foundation.h>

void (^f)(id) = ^(id x) {
NSLog(@"Hello World %@", x);
};

int main(int argc, char *argv[])
{
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
f(@"hoge");
[pool release];
return 0;
}
//--- source code end ---

コンパイル　build

$clang -framework Foundation sample1.mm -o sample1

実行
.$/sample12012-06-03 08:07:04.079 sample1[4384:707] Hello World hoge

ヘルプ
clang --help
OVERVIEW: clang "gcc-compatible" driver

USAGE: clang [options] <inputs>

OPTIONS:
-### Print the commands to run for this compilation
--analyze Run the static analyzer
--help Display available options
--relocatable-pch Build a relocatable precompiled header
--serialize-diagnostics <value>
Serialize compiler diagnostics to a file
-E Only run the preprocessor
-ObjC++ Treat source input files as Objective-C++ inputs
-ObjC Treat source input files as Objective-C inputs
-Qunused-arguments Don't emit warning for unused driver arguments
-S Only run preprocess and compilation steps
-Wa,<arg> Pass the comma separated arguments in <arg> to the assembler
-Wl,<arg> Pass the comma separated arguments in <arg> to the linker
-Wp,<arg> Pass the comma separated arguments in <arg> to the preprocessor
-Xanalyzer <arg> Pass <arg> to the static analyzer
-Xassembler <arg> Pass <arg> to the assembler
-Xclang <arg> Pass <arg> to the clang compiler
-Xlinker <arg> Pass <arg> to the linker
-Xpreprocessor <arg> Pass <arg> to the preprocessor
-arcmt-migrate-emit-errors
Emit ARC errors even if the migrator can fix them
-arcmt-migrate-report-output <value>
Output path for the plist report
-c Only run preprocess, compile, and assemble steps
-emit-ast Emit Clang AST files for source inputs
-emit-llvm Use the LLVM representation for assembler and object files
-fcatch-undefined-behavior
Generate runtime checks for undefined behavior.
-flimit-debug-info Limit debug information produced to reduce size of debug binary
-fno-limit-debug-info Do not limit debug information produced to reduce size of debug binary
-ftrap-function=<value> Issue call to specified function rather than a trap instruction
-o <file> Write output to <file>
-pipe Use pipes between commands, when possible
-print-file-name=<file> Print the full library path of <file>
-print-libgcc-file-name Print the library path for "libgcc.a"
-print-prog-name=<name> Print the full program path of <name>
-print-search-dirs Print the paths used for finding libraries and programs
-rewrite-objc Rewrite Objective-C source to C++
-save-temps Save intermediate compilation results
-time Time individual commands
-verify Verify output using a verifier.
-v Show commands to run and use verbose output
-working-directory <value>
Resolve file paths relative to the specified directory
-x <language> Treat subsequent input files as having type <language>