From owner-freebsd-hackers@FreeBSD.ORG Mon Dec 30 01:31:55 2013 Return-Path: Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id D671D463 for ; Mon, 30 Dec 2013 01:31:55 +0000 (UTC) Received: from mail-ob0-x229.google.com (mail-ob0-x229.google.com [IPv6:2607:f8b0:4003:c01::229]) (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits)) (No client certificate requested) by mx1.freebsd.org (Postfix) with ESMTPS id 99E901863 for ; Mon, 30 Dec 2013 01:31:55 +0000 (UTC) Received: by mail-ob0-f169.google.com with SMTP id wm4so11179693obc.14 for ; Sun, 29 Dec 2013 17:31:55 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; bh=EYcVi9VCj1uWvSHpGKALT/0acqrlXLPWDmDsaWMGUJI=; b=z99DmnF8G6Et96KORCDvckeaShJSKYgSI7nD5XD0iWrZYZhNxNFGwmGzl+vlqMIzob ctxl1gBjoavqpigjJIdYOQWvgUxUQPmBfrqXw8LedBb4DIZKlDLYZozOHsHxPRSOEAX3 bBLFKy2azQkbZoUmgAZy9ibCkJ7SYHJ/R1zwZ7+QtW+cF0RwYvZqo7QRq96E56GKGVz/ u7bLRI/9aybT/HPS3THJjICpTVP55c/SemekVcWHBGZlyu7EaMkoseJVWScRkMcazI6h bXnUZW0lwQEUT5Wz3Ef48mUsVbaGX8PsuvGNxd7iYTIkl+1zr3+e5QSTu0/wgyAD5UDB r4mA== MIME-Version: 1.0 X-Received: by 10.60.56.137 with SMTP id a9mr90780oeq.75.1388367114863; Sun, 29 Dec 2013 17:31:54 -0800 (PST) Received: by 10.182.78.100 with HTTP; Sun, 29 Dec 2013 17:31:54 -0800 (PST) In-Reply-To: References: Date: Sun, 29 Dec 2013 20:31:54 -0500 Message-ID: Subject: Re: template example From: Joe Nosay To: FreeBSD Hackers Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable X-Content-Filtered-By: Mailman/MimeDel 2.1.17 X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 30 Dec 2013 01:31:56 -0000 On Sun, Dec 29, 2013 at 12:22 PM, Tim Kientzle wrote: > On Dec 29, 2013, at 9:11 AM, Joe Nosay wrote: > > > > > On Sat, Dec 28, 2013 at 10:44 PM, Joe Nosay > wrote: > > > > > > > > On Sat, Dec 28, 2013 at 3:52 AM, Tim Kientzle wrote: > > > > On Dec 27, 2013, at 7:41 PM, Joe Nosay wrote: > > > > > The standard "Hello World!" doesn't seem to work. > > > > Which one? Share the program you=92re trying to compile and what erro= rs > you=92re seeing. > > > > Tim > > > > > > > > > > Thanks @Alfred_Perlstein it worked with that example using clang > -fsyntax-only h.cpp > > > > a.out is the file. > > Never post binaries to a mailing list. It's rather rude. > My apologies. > > > > Trying a different approach with ::: > > #include > > > > #include > > > > int > > main(int Argc, char **Argv) > > { > > int rv; > > > > rv =3D system("echo 'ls /tmp' " && " echo blee bble blle "); > > std::cout << "return status from system call is: " << rv << > std::endl; > > return (rv); > > } > > > > > > > > The output comes before the blee and the blee is not printed. What I > need is for the output to be listed - or the act > > ion to be executed - along with the echo. This time, clang -E > -fsyntax-only h.cpp was used with no a.out being created. What was the > difference between Perlstein's script and mine? > > Why are you using -E option here? The -E option actually tells clang to > not compile the program, which is why you got no a.out file. > > You should also probably not get into the habit of using 'clang' directly > but instead use the standard 'cc' or 'c++' commands. These are just > aliases for the default system compiler. You can find out what compiler > that is by asking it: > > $ cc --version > FreeBSD clang version 3.3 (tags/RELEASE_33/final 183502) 20130610 > > > As for your program above, the && is outside of the quotations, so it's > not doing what you expect. > > Try this line instead: > > rv =3D system("echo 'ls /tmp' && echo blee bble blle"); > > This type of programming (mixing C++ and shell) can get very confusing. > > Tim > >