gcc: turning off large-address awareness

Ken Brown kbrown@cornell.edu
Sat Apr 14 18:48:00 GMT 2012


On 4/14/2012 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.

That works, thanks.  I didn't know about spec files.

Ken


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