| delorie.com/archives/browse.cgi | search |
--------------ABA29E44476E4C424C8F9FB0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Hubert Garavel wrote:
>
> I face a backward compatibility problem with fstat() due to a recent
> change in gcc -mno-cygwin (the new GCC links against MVSC instead of CRT).
> There have been already a few posts on this issue, but my question is
> different.
>
> I have a binary library (".a" file) which calls fstat().
> This library was obtained by cross-compilation using an older GCC
> that links against CRTDLL (gcc version 2.95.2 19991024 (release-2).
>
> This library worked well on previous versions of Cygwin, but fails
> on the recent ones (lasting from 2001). It seems that, when linked to MSVC,
> fstat() uses different data structures and returns different results than
> when linked to CRT.
>
> If possible, I would keep the .a library unchanged.
>
> Which options should be given to the new gcc (in addition -mno-cygwin)
> so that it continues to link against CRTDLL as before and uses the
> appropriate include files for this? This is really a backard compatibility
> model.
>
I've attached a specs-crtdll file that should work for what you want.
To use it you would `gcc -specs=specs-crtdll'.
> Thanks in advance
> Hubert
>
> PS: For my curiosity, what are the reasons for switching from CRT to MSVC ?
>
The reason is that CRTDLL is deprecated. It was created for Win95
version 1. Microsoft changed to MSVCRT with Win95 version 2. I polled
this list before the change was made. No one spoke against the change.
Earnie.
P.S.: Caveat Emptor: I did not test the specs file. I simply made the
changes I remembered to be necessary.
--------------ABA29E44476E4C424C8F9FB0
Content-Type: text/plain; charset=us-ascii;
name="specs-crtdll"
Content-Transfer-Encoding: 7bit
Content-Disposition: inline;
filename="specs-crtdll"
*asm:
*asm_final:
*cpp:
%{mno-win32: %{mno-cygwin: %emno-cygwin and mno-win32 are not compatible}} %(cpp_cpu) %{posix:-D_POSIX_SOURCE} %{mno-cygwin:-D__MINGW32__ %{mthreads:-D_MT} -isystem /usr/include/mingw/g++-3 -isystem /usr/include/mingw/g++ -isystem /usr/local/include/mingw -idirafter /usr/include/mingw} %{!mno-cygwin:-D__CYGWIN32__ -D__CYGWIN__ -Dunix -D__unix__ -D__unix -isystem /usr/local/include -idirafter /usr/include} %{mwin32|mno-cygwin:-DWIN32 -D_WIN32 -D__WIN32 -D__WIN32__ -DWINNT -idirafter /usr/include/w32api}
*cc1:
%(cc1_spec)
*cc1plus:
*endfile:
*link:
%{mwindows:--subsystem windows} %{mconsole:--subsystem console} %{shared: %{mdll: %eshared and mdll are not compatible}} %{shared: --shared} %{mdll:--dll} %{static:-Bstatic} %{!static:-Bdynamic} %{shared|mdll: -e %{mno-cygwin:_DllMainCRTStartup AT 12} %{!mno-cygwin:__cygwin_dll_entry AT 12}} --dll-search-prefix=cyg
*lib:
%{pg:-lgmon} %{!mno-cygwin:-lcygwin} %{mno-cygwin:%{mthreads:-lmingwthrd} -lmingw32} %{mwindows:-lgdi32 -lcomdlg32} -luser32 -lkernel32 -ladvapi32 -lshell32
*libgcc:
%{mno-cygwin: %{mthreads:-lmingwthrd} -lmingw32} -lgcc %{mno-cygwin:-lcoldname -lcrtdll}
*startfile:
%{shared|mdll: %{mno-cygwin:dllcrt1%O%s}} %{!shared: %{!mdll: %{!mno-cygwin:crt0%O%s} %{mno-cygwin:-L/usr/lib/mingw mingw/crt1%O%s} %{pg:gcrt0%O%s}}}
*switches_need_spaces:
*signed_char:
%{funsigned-char:-D__CHAR_UNSIGNED__}
*predefines:
-Di386 -D__386__ -D__i386 -D_X86=1 -D__STDC__=1 -D__stdcall=__attribute__((__stdcall__)) -D__cdecl=__attribute__((__cdecl__)) -D__declspec(x)=__attribute__((x)) -Asystem(winnt) -Acpu(i386) -Amachine(i386)
*cross_compile:
0
*version:
gcc-2.95.2-9
*multilib:
. ;
*multilib_defaults:
*multilib_extra:
*multilib_matches:
*linker:
collect2
*cpp_486:
%{!ansi:-Di486} -D__i486 -D__i486__
*cpp_586:
%{!ansi:-Di586 -Dpentium} -D__i586 -D__i586__ -D__pentium -D__pentium__
*cpp_k6:
%{!ansi:-Di586 -Dk6} -D__i586 -D__i586__ -D__k6 -D__k6__
*cpp_686:
%{!ansi:-Di686 -Dpentiumpro} -D__i686 -D__i686__ -D__pentiumpro -D__pentiumpro__
*cpp_cpu_default:
%(cpp_686)
*cpp_cpu:
-Acpu(i386) -Amachine(i386) %{!ansi:-Di386} -D__i386 -D__i386__ %{mcpu=i486:%(cpp_486)} %{m486:%(cpp_486)} %{mpentium:%(cpp_586)} %{mcpu=pentium:%(cpp_586)} %{mpentiumpro:%(cpp_686)} %{mcpu=pentiumpro:%(cpp_686)} %{mcpu=k6:%(cpp_k6)} %{!mcpu*:%{!m486:%{!mpentium*:%(cpp_cpu_default)}}}
*cc1_cpu:
%{!mcpu*: %{m386:-mcpu=i386 -march=i386} %{m486:-mcpu=i486 -march=i486} %{mpentium:-mcpu=pentium} %{mpentiumpro:-mcpu=pentiumpro}}
*mingw_include_path:
i686-pc-cygwin
*link_command:
%{!fsyntax-only: %{!c:%{!M:%{!MM:%{!E:%{!S:%(linker) %l %X %{o*} %{A} %{d} %{e*} %{m} %{N} %{n} %{r} %{s} %{t} %{u*} %{x} %{z} %{Z} %{!A:%{!nostdlib:%{!nostartfiles:%S}}} %{static:} %{L*} %D %o %{!nostdlib:%{!nodefaultlibs:%G %L %G}} %{!A:%{!nostdlib:%{!nostartfiles:%E}}} %{T*}
}}}}}}
--------------ABA29E44476E4C424C8F9FB0
Content-Type: text/plain; charset=us-ascii
--
Want to unsubscribe from this list?
Check out: http://cygwin.com/ml/#unsubscribe-simple
--------------ABA29E44476E4C424C8F9FB0--
_________________________________________________________
Do You Yahoo!?
Get your free @yahoo.com address at http://mail.yahoo.com
| webmaster | delorie software privacy |
| Copyright © 2019 by DJ Delorie | Updated Jul 2019 |