On 17. 11. 2014 19:35, Óscar Fuentes wrote:
> Building Emacs master with the mingw-w64-i686 toolset on Windows 8.1 64
> bits with MSYS2 64 bits fails because it produces an invalid temacs.exe
> executable:
>
> $ src/temacs.exe
> bash: src/temacs.exe: cannot execute binary file: Exec format error
Few notes first. Running the binary directly from Windows shell causes appinfo
to display an "app can't run on your PC" error, which is common for
architecture mismatches (like when running x64 binary on x86 system). Running
"strace ./temacs" confirmed it by displaying error code 193
(ERROR_BAD_EXE_FORMAT, "... is not a valid Win32 application").
The command that links temacs.exe on i686:
> gcc -std=gnu99 -Demacs -I. -I. -I../lib -I../lib -mtune=generic
> -pthread -mms-bitfields
> -ID:/applications/msys2.x64/mingw32/include/librsvg-2.0
> -ID:/applications/msys2.x64/mingw32/include/gdk-pixbuf-2.0
> -ID:/applications/msys2.x64/mingw32/include/libpng16
> -ID:/applications/msys2.x64/mingw32/include/cairo
> -ID:/applications/msys2.x64/mingw32/include/glib-2.0
> -ID:/applications/msys2.x64/mingw32/lib/glib-2.0/include
> -ID:/applications/msys2.x64/mingw32/include/pixman-1
> -ID:/applications/msys2.x64/mingw32/include -I/mingw32/include
> -I/mingw32/include/freetype2 -I/mingw32/include -I/mingw32/include/libpng16
> -I/mingw32/include/harfbuzz -ID:/applications/msys2.x64/mingw32/include
> -ID:/applications/msys2.x64/mingw32/include/freetype2
> -ID:/applications/msys2.x64/mingw32/include
> -ID:/applications/msys2.x64/mingw32/include/harfbuzz
> -ID:/applications/msys2.x64/mingw32/include/libpng16 -fopenmp
> -DMAGICKCORE_HDRI_ENABLE=1 -DMAGICKCORE_QUANTUM_DEPTH=16 -D_DLL -D_MT
> -fopenmp -DMAGICKCORE_HDR
I_ENABLE=1 -DMAGICKCORE_QUANTUM_DEPTH=16 -D_DLL -D_MT
-ID:/applications/msys2.x64/mingw32/include/ImageMagick-6
-ID:/applications/msys2.x64/mingw32/include/libxml2
-ID:/applications/msys2.x64/mingw32/include/dbus-1.0
-ID:/applications/msys2.x64/mingw32/lib/dbus-1.0/include -MMD -MF
deps/.d -MP -ID:/applications/msys2.x64/mingw32/include
-ID:/applications/msys2.x64/mingw32/include/p11-kit-1
-ID:/applications/msys2.x64/mingw32/include -g3 -O2 -gdwarf-2
-Wl,-stack,0x00800000 -Wl,-heap,0x00100000 -Wl,-image-base,0x400000000
-Wl,-entry,__start -Wl,-Map,./temacs.map -o temacs firstfile.o dispnew.o
frame.o scroll.o xdisp.o menu.o window.o charset.o coding.o category.o ccl.o
character.o chartab.o bidi.o term.o terminal.o xfaces.o dbusbind.o emacs.o
keyboard.o macros.o keymap.o sysdep.o buffer.o filelock.o insdel.o marker.o
minibuf.o fileio.o dired.o cmds.o casetab.o casefiddle.o indent.o search.o
regex.o undo.o alloc.o data.o doc.o editfns.o callint.o eval.o floatfns.o
fns.o font.o print.o lread.o syntax.o unexw32.o bytecode.o process.o gnutls.o
callproc.o region-cache.o sound.o atimer.o doprnt.o intervals.o textprop.o
composite.o xml.o w32notify.o profiler.o decompress.o w32fns.o w32menu.o
w32reg.o w32font.o w32term.o w32xfns.o w32select.o w32uniscribe.o w32.o
w32console.o w32heap.o w32inevt.o w32proc.o fontset.o fringe.o image.o
tparam.o lastfile.o ../lib/libgnu.a emacs.res -lwinmm -lgdi32 -lcomdlg32
-lmpr -lwinspool -lole32 -lcomctl32 -lusp10
-LD:/applications/msys2.x64/mingw32/lib -lMagickWand-6.Q16HDRI
-lMagickCore-6.Q16HDRI -LD:/applications/msys2.x64/mingw32/lib -ldbus-1
The offending argument is "-Wl,-image-base,0x400000000", which sets the
executable to instruct Windows loader to load the executable at the 16 GiB mark
or higher in virtual memory, which is ridiculous for a 32-bit program. So
although the error message is not very clear, it's justified, this binary can't
be loaded.
I found the declaration in configure.ac in a case starting at line 4911. The
linker argument is added there when building on 64-bit mingw, probably in an
attempt to improve performance and/or compatibility. The problem is that even
on i686, the $canonical triplet is "x86_64-pc-mingw32". I have not tried to
find out why the triplet is wrong. The PKGBUILD doesn't have this problem
because it always passes correct "--build=${MINGW_CHOST}" to configure.
--
David Macek
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