From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 81690 invoked by alias); 14 Feb 2020 08:10:10 -0000 Mailing-List: contact gcc-cvs-wwwdocs-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Archive: List-Post: List-Help: Sender: gcc-cvs-wwwdocs-owner@gcc.gnu.org Received: (qmail 81627 invoked by uid 9071); 14 Feb 2020 08:10:09 -0000 Date: Fri, 14 Feb 2020 08:10:00 -0000 Message-ID: <20200214081009.81623.qmail@sourceware.org> From: jakub@gcc.gnu.org To: gcc-cvs-wwwdocs@gcc.gnu.org Subject: gcc-wwwdocs branch master updated. e37f2d6af29c52a51cb36058e3a7a2b79469f045 X-Git-Refname: refs/heads/master X-Git-Reftype: branch X-Git-Oldrev: 223de66470c17e210f7e7ecceb054c7bb29d49d5 X-Git-Newrev: e37f2d6af29c52a51cb36058e3a7a2b79469f045 X-SW-Source: 2020/txt/msg00087.txt This is an automated email from the git hooks/post-receive script. It was generated because a ref change was pushed to the repository containing the project "gcc-wwwdocs". The branch, master has been updated via e37f2d6af29c52a51cb36058e3a7a2b79469f045 (commit) from 223de66470c17e210f7e7ecceb054c7bb29d49d5 (commit) Those revisions listed above that are new to this repository have not appeared on any other notification email; so we list those revisions in full, below. - Log ----------------------------------------------------------------- commit e37f2d6af29c52a51cb36058e3a7a2b79469f045 Author: Jakub Jelinek Date: Fri Feb 14 09:09:44 2020 +0100 wwwdocs: Mention common attribute diff --git a/htdocs/gcc-10/porting_to.html b/htdocs/gcc-10/porting_to.html index 980d3af1..9574aacc 100644 --- a/htdocs/gcc-10/porting_to.html +++ b/htdocs/gcc-10/porting_to.html @@ -41,7 +41,12 @@ and provide solutions. Let us know if you have suggestions for improvements! which means a linker error will now be reported. To fix this, use extern in header files when declaring global variables, and ensure each global is defined in exactly one C file. - As a workaround, legacy C code can be compiled with -fcommon. + If tentative definitions of particular variables need to be + placed in a common block, __attribute__((__common__)) can be + used to force that behavior even in code compiled without + -fcommon. + As a workaround, legacy C code where all tentative definitions should + be placed into a common block can be compiled with -fcommon. 


       int x;  // tentative definition - avoid in header files

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Summary of changes:
 htdocs/gcc-10/porting_to.html | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)


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