gcc: turning off large-address awareness

[Ken Brown]

On 4/14/2012 1:52 PM, Earnie Boyd wrote:
> 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.

No, you might just be building a .exe.

Ken


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