X-Recipient: archive-cygwin@delorie.com X-SWARE-Spam-Status: No, hits=-4.9 required=5.0 tests=AWL,BAYES_00,DKIM_SIGNED,DKIM_VALID,FREEMAIL_FROM,KHOP_RCVD_TRUST,KHOP_THREADED,RCVD_IN_DNSWL_LOW,RCVD_IN_HOSTKARMA_YE,TW_NW X-Spam-Check-By: sourceware.org MIME-Version: 1.0 In-Reply-To: <20120414173342.GD15801@ednor.casa.cgf.cx> References: <4F896504.3030006@cornell.edu> <4F89B215.9050903@cornell.edu> <20120414173342.GD15801@ednor.casa.cgf.cx> Date: Sat, 14 Apr 2012 13:52:46 -0400 Message-ID: Subject: Re: gcc: turning off large-address awareness From: Earnie Boyd To: cygwin@cygwin.com Content-Type: text/plain; charset=UTF-8 X-IsSubscribed: yes Mailing-List: contact cygwin-help@cygwin.com; run by ezmlm Precedence: bulk List-Id: List-Unsubscribe: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner@cygwin.com Mail-Followup-To: cygwin@cygwin.com Delivered-To: mailing list cygwin@cygwin.com Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by delorie.com id q3EHr8fY019896 On Sat, Apr 14, 2012 at 1:33 PM, Christopher Faylor wrote: > On Sat, Apr 14, 2012 at 01:21:25PM -0400, Ken Brown wrote: >>On 4/14/2012 12:37 PM, Earnie Boyd wrote: >>> On Sat, Apr 14, 2012 at 7:52 AM, Ken Brown wrote: >>>> For testing purposes, I'd like to build without large-address awareness. >>>>   What's the right way to do that?  I tried >>>> >>>>    LDFLAGS=-Wl,--no-large-address-aware >>>> >>>> and >>>> >>>>    LDFLAGS=-Wl,--disable-large-address-aware >>>> >>>> but both resulted in "unrecognized option" errors from ld. >>> >>> You specify --large-address-aware if you want it and don't specify if >>> you don't want it. >> >>Sorry, I should have explained more clearly what the issue is.  Cygwin's >>gcc specifies --large-address-aware by default: >> >>$ gcc -dumpspecs | grep large >>   %{mwindows:--subsystem windows}   %{mconsole:--subsystem console} >>%{!mno-cygwin:%{!mno-use-libstdc-wrappers:   --wrap _Znwj   --wrap _Znaj >>   --wrap _ZdlPv   --wrap _ZdaPv   --wrap _ZnwjRKSt9nothrow_t   --wrap >>_ZnajRKSt9nothrow_t   --wrap _ZdlPvRKSt9nothrow_t   --wrap >>_ZdaPvRKSt9nothrow_t }}   %{shared: %{mdll: %eshared and mdll are not >>compatible}}   %{shared: --shared} %{mdll:--dll}   %{static:-Bstatic} >>%{!static:-Bdynamic}   %{shared|mdll: --enable-auto-image-base -e >>%{mno-cygwin:_DllMainCRTStartup@12} >>%{!mno-cygwin:__cygwin_dll_entry@12}} >>%{!mno-cygwin:--dll-search-prefix=cyg     %{!shared: %{!mdll: >>--large-address-aware --tsaware}}} >> >>I'm trying to override this default. > > You're right that there isn't a way to disable --large-address-aware > but, since it's part of the specs, I'm not sure what would take > precedence if there was a --disable* option. > > You could try using the above to create your own spec file and use > that on the command line for gcc, cumbersome as it is. Reading the specs snippet --large-address-aware is only used if -shared and -mdll have *not* been specified, i.e. you are building with -static specified. I think this is a bit strange but I don't know the reasoning behind it. -- Earnie -- https://sites.google.com/site/earnieboyd -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple