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Date: Fri, 5 Jun 2009 09:00:45 +0800
Message-ID: <f4d6f44b0906041800y740b2819ub7fe3ea8f382707@mail.gmail.com>
Subject: GCC --enable-auto-import problem
From: Huang Bambo <bambo DOT huang AT gmail DOT com>
To: cygwin AT cygwin DOT com
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1. download db-4.7.25 from oracle at
http://www.oracle.com/database/berkeley-db/index.html (havn't tested
on other version)
2. configure like : ../dist/configure --prefix=3D/home/Bambo/db-for-1.7
--enable-cxx --enable-pthread_api
3. make, it will take you a few minutes
4. write a program like :
#include <db_cxx.h>

int main( void )
{
=A0 =A0 =A0 =A0Db db( NULL, 0 );
=A0 =A0 =A0 =A0return 0;
}

5.compile like :g++ -o t test.cpp -L/home/Bambo/db-for-1.7/lib
-ldb_cxx -I/home/Bambo/db-for-1.7/include
will compile and link ok with information:
Info: resolving typeinfo for std::exception by linking to
__imp___ZTISt9exception (auto-import)
/usr/lib/gcc/i686-pc-cygwin/4.3.2/../../../../i686-pc-cygwin/bin/ld:
warning: auto-importing has been activated without
--enable-auto-import specified on the command line.
This should work unless it involves constant data structures
referencing symbols from auto-imported DLLs.

and the file t.exe can't run, direct run in windows command shell will
report "can't load" with error code 0x00000005.
( use:"ldd t.exe" to find dlls used by the file will hung ldd)

6.compile like:g++ -o t test.cpp -L/home/Bambo/db-for-1.7/lib -ldb_cxx
-I/home/Bambo/db-for-1.7/include -Wl,--enable-auto-import
Then everything goes fine.
ldd t.exe will report:

$ ldd t.exe
=A0 =A0 =A0 =A0ntdll.dll =3D> /cygdrive/c/WINDOWS/system32/ntdll.dll (0x7c9=
20000)
=A0 =A0 =A0 =A0kernel32.dll =3D> /cygdrive/c/WINDOWS/system32/kernel32.dll =
(0x7c800000)
=A0 =A0 =A0 =A0cygwin1.dll =3D> /usr/bin/cygwin1.dll (0x61000000)
=A0 =A0 =A0 =A0ADVAPI32.DLL =3D> /cygdrive/c/WINDOWS/system32/ADVAPI32.DLL =
(0x77da0000)
=A0 =A0 =A0 =A0RPCRT4.dll =3D> /cygdrive/c/WINDOWS/system32/RPCRT4.dll (0x7=
7e50000)
=A0 =A0 =A0 =A0Secur32.dll =3D> /cygdrive/c/WINDOWS/system32/Secur32.dll (0=
x77fc0000)
=A0 =A0 =A0 =A0cyggcc_s-1.dll =3D> /usr/bin/cyggcc_s-1.dll (0x67f00000)
=A0 =A0 =A0 =A0cygstdc++-6.dll =3D> /usr/bin/cygstdc++-6.dll (0x6c480000)


Who can tell me why??? Everything goes fine under cygwin 1.5 with gcc
3,( gcc4 in cygwin 1.5 not tested), even
without "-Wl,--enable-auto-import"

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