extra alignment/padding when using pe-i386

[Galen Seitz <galens at seitzassoc dot com>]

When assembling the following code with an assembler that generates 
pe-i386 format, the data section gets extra bytes added *after* the 
constant value.  When the same code is assembled using an assembler 
that generates elf32-i386, the extra bytes are not present.  Is there 
a way to make the output of the pe-i386 and elf32-i386 assemblers 
match?  The pe-i386 assembler is being run under cygwin, and the 
elf32-i386 assembler is being run under linux.  (Please pardon the 
line wrapping.)

thanks,
galen


$ cat bar.s
        .data
        .align 16
        .word   1

#==== cygwin ====
$ gcc -v -c bar.s
Using built-in specs.
Target: i686-pc-cygwin
Configured with: /gnu/gcc/package/gcc4-4.3.2-2/src/gcc-4.3.2/configure 
--srcdir=/gnu/gcc/package/gcc4-4.3.2-2/src/gcc-4.3.2 --prefix=/usr 
--exec-prefix=/usr --bindir=/usr/bin --sbindir=/usr/sbin 
--libexecdir=/usr/sbin --datadir=/usr/share --localstatedir=/var 
--sysconfdir=/etc --infodir=/usr/share/info --mandir=/usr/share/man 
--datadir=/usr/share --infodir=/usr/share/info --mandir=/usr/share/man 
-v --with-gmp=/usr --with-mpfr=/usr --enable-bootstrap 
--enable-version-specific-runtime-libs --with-slibdir=/usr/bin 
--libexecdir=/usr/lib --enable-static --enable-shared 
--enable-shared-libgcc --enable-__cxa_atexit --with-gnu-ld 
--with-gnu-as --with-dwarf2 --disable-sjlj-exceptions 
--enable-languages=ada,c,c++,fortran,java,objc,obj-c++ 
--disable-symvers --enable-libjava --program-suffix=-4 
--enable-libgomp --enable-libssp --enable-libada 
--enable-threads=posix AS=/opt/gcc-tools/bin/as.exe 
AS_FOR_TARGET=/opt/gcc-tools/bin/as.exe LD=/opt/gcc-tools/bin/ld.exe 
LD_FOR_TARGET=/opt/gcc-tools/bin/ld.exe
Thread model: posix
gcc version 4.3.2 20080827 (beta) 2 (GCC)
COLLECT_GCC_OPTIONS='-v' '-c' '-mtune=generic'

/usr/lib/gcc/i686-pc-cygwin/4.3.2/../../../../i686-pc-cygwin/bin/as.exe 
-v -o bar.o bar.s
GNU assembler version 2.18.50 (i686-pc-cygwin) using BFD version (GNU 
Binutils) 2.18.50.20080625
COMPILER_PATH=/usr/lib/gcc/i686-pc-cygwin/4.3.2/:/usr/lib/gcc/i686-pc-cygwin/4.3.2/:/usr/lib/gcc/i686-pc-cygwin/:/usr/lib/gcc/i686-pc-cygwin/4.3.2/:/usr/lib/gcc/i686-pc-cygwin/:/usr/lib/gcc/i686-pc-cygwin/4.3.2/:/usr/lib/gcc/i686-pc-cygwin/:/usr/lib/gcc/i686-pc-cygwin/4.3.2/../../../../i686-pc-cygwin/bin/
LIBRARY_PATH=/usr/lib/gcc/i686-pc-cygwin/4.3.2/:/usr/lib/gcc/i686-pc-cygwin/4.3.2/:/usr/lib/gcc/i686-pc-cygwin/4.3.2/../../../:/lib/:/usr/lib/
COLLECT_GCC_OPTIONS='-v' '-c' '-mtune=generic'

$ objdump.exe -s bar.o

bar.o:     file format pe-i386

Contents of section .data:
 0000 01000000 00000000 00000000 00000000  ................


#==== linux ====
$ gcc -v -c bar.s
Using built-in specs.
Target: i386-redhat-linux
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man 
--infodir=/usr/share/info --enable-shared --enable-threads=posix 
--enable-checking=release --with-system-zlib --enable-__cxa_atexit 
--disable-libunwind-exceptions --enable-libgcj-multifile 
--enable-languages=c,c++,objc,obj-c++,java,fortran,ada 
--enable-java-awt=gtk --disable-dssi --enable-plugin 
--with-java-home=/usr/lib/jvm/java-1.4.2-gcj-1.4.2.0/jre 
--with-cpu=generic --host=i386-redhat-linux
Thread model: posix
gcc version 4.1.2 20080704 (Red Hat 4.1.2-44)
 as -V -Qy -o bar.o bar.s
GNU assembler version 2.17.50.0.6-9.el5 (i386-redhat-linux) using BFD 
version 2.17.50.0.6-9.el5 20061020

$ objdump -s bar.o

bar.o:     file format elf32-i386

Contents of section .data:
 0000 0100                                 ..


--
Galen Seitz
galens@seitzassoc.com