Date: Mon, 03 Jul 2000 22:43:10 +0200 From: Poul-Henning Kamp <phk@critter.freebsd.dk> To: David Malone <dwmalone@maths.tcd.ie> Cc: freebsd-hackers@FreeBSD.ORG Subject: Re: Global variables defined several times. Message-ID: <8739.962656990@critter.freebsd.dk> In-Reply-To: Your message of "Mon, 03 Jul 2000 21:40:21 BST." <200007032140.aa37554@salmon.maths.tcd.ie>
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In message <200007032140.aa37554@salmon.maths.tcd.ie>, David Malone writes: >I've just noticed that usr.bin/ftp/ftp_var.h defines a large >selection of global variables, and then this header file is included >in multiple C source files. > >I thought this should lead to one copy of the global varible per >source file, and then a warning or error at link time due to symbols >being defined multiple times. This doesn't seem to be the case with >the toolchain - you seem to get one copy of each variable for the >final linked unit. This is called "common" variables. They're documented with that behaviour in the old and new testament. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD coreteam member | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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