# \-DSWIPL\_M32, compiling 32bit prolog under 64bit host fails **URL:** \ **Category:** General\ **Created:** [August 26, 2022, 3:46pm UTC](https://swi-prolog.discourse.group/t/dswipl-m32-compiling-32bit-prolog-under-64bit-host-fails/5712 "2022-08-26T15:46:28Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![swi](https://avatars.discourse-cdn.com/v4/letter/s/51bf81/32.png) [@swi](https://swi-prolog.discourse.group/u/swi)\ **Post date:** [August 26, 2022, 3:46pm UTC](https://swi-prolog.discourse.group/t/dswipl-m32-compiling-32bit-prolog-under-64bit-host-fails/5712/1 "2022-08-26T15:46:28Z")
swi-prolog is not compiling the 32bit version on a 64bit host by using the SWIPL\_M32 flag. The problem maybe comes from the new gmp cmake code for wasm: ```prolog [1/2099] Linking C shared library src/libswipl.so.8.5.15 FAILED: src/libswipl.so.8.5.15 : && /usr/sbin/cc -fPIC -m32 -O2 -shared -Wl,-soname,libswipl.so.8 -o src/libswipl.so.8.5.15 src/CMakeFiles/swiplobjs.dir/pl-atom.c.o src/CMakeFiles/swiplobjs.dir/pl-wam.c.o src/CMakeFiles/swiplobjs.dir/pl-arith.c.o src/CMakeFiles/swiplobjs.dir/pl-bag.c.o src/CMakeFiles/swiplobjs.dir/pl-error.c.o src/CMakeFiles/swiplobjs.dir/pl-comp.c.o src/CMakeFiles/swiplobjs.dir/pl-zip.c.o src/CMakeFiles/swiplobjs.dir/pl-dwim.c.o src/CMakeFiles/swiplobjs.dir/pl-ext.c.o src/CMakeFiles/swiplobjs.dir/pl-flag.c.o src/CMakeFiles/swiplobjs.dir/pl-funct.c.o src/CMakeFiles/swiplobjs.dir/pl-gc.c.o src/CMakeFiles/swiplobjs.dir/pl-privitf.c.o src/CMakeFiles/swiplobjs.dir/pl-list.c.o src/CMakeFiles/swiplobjs.dir/pl-string.c.o src/CMakeFiles/swiplobjs.dir/pl-load.c.o src/CMakeFiles/swiplobjs.dir/pl-modul.c.o src/CMakeFiles/swiplobjs.dir/pl-op.c.o src/CMakeFiles/swiplobjs.dir/pl-prims.c.o src/CMakeFiles/swiplobjs.dir/pl-pro.c.o src/CMakeFiles/swiplobjs.dir/pl-proc.c.o src/CMakeFiles/swiplobjs.dir/pl-prof.c.o src/CMakeFiles/swiplobjs.dir/pl-read.c.o src/CMakeFiles/swiplobjs.dir/pl-rec.c.o src/CMakeFiles/swiplobjs.dir/pl-setup.c.o src/CMakeFiles/swiplobjs.dir/pl-sys.c.o src/CMakeFiles/swiplobjs.dir/pl-trace.c.o src/CMakeFiles/swiplobjs.dir/pl-util.c.o src/CMakeFiles/swiplobjs.dir/pl-wic.c.o src/CMakeFiles/swiplobjs.dir/pl-write.c.o src/CMakeFiles/swiplobjs.dir/pl-term.c.o src/CMakeFiles/swiplobjs.dir/pl-thread.c.o src/CMakeFiles/swiplobjs.dir/pl-xterm.c.o src/CMakeFiles/swiplobjs.dir/pl-srcfile.c.o src/CMakeFiles/swiplobjs.dir/pl-beos.c.o src/CMakeFiles/swiplobjs.dir/pl-attvar.c.o src/CMakeFiles/swiplobjs.dir/pl-gvar.c.o src/CMakeFiles/swiplobjs.dir/pl-btree.c.o src/CMakeFiles/swiplobjs.dir/pl-init.c.o src/CMakeFiles/swiplobjs.dir/pl-gmp.c.o src/CMakeFiles/swiplobjs.dir/pl-segstack.c.o src/CMakeFiles/swiplobjs.dir/pl-hash.c.o src/CMakeFiles/swiplobjs.dir/pl-version.c.o src/CMakeFiles/swiplobjs.dir/pl-codetable.c.o src/CMakeFiles/swiplobjs.dir/pl-supervisor.c.o src/CMakeFiles/swiplobjs.dir/pl-dbref.c.o src/CMakeFiles/swiplobjs.dir/pl-termhash.c.o src/CMakeFiles/swiplobjs.dir/pl-variant.c.o src/CMakeFiles/swiplobjs.dir/pl-assert.c.o src/CMakeFiles/swiplobjs.dir/pl-copyterm.c.o src/CMakeFiles/swiplobjs.dir/pl-debug.c.o src/CMakeFiles/swiplobjs.dir/pl-cont.c.o src/CMakeFiles/swiplobjs.dir/pl-ressymbol.c.o src/CMakeFiles/swiplobjs.dir/pl-dict.c.o src/CMakeFiles/swiplobjs.dir/pl-trie.c.o src/CMakeFiles/swiplobjs.dir/pl-indirect.c.o src/CMakeFiles/swiplobjs.dir/pl-tabling.c.o src/CMakeFiles/swiplobjs.dir/pl-rsort.c.o src/CMakeFiles/swiplobjs.dir/pl-mutex.c.o src/CMakeFiles/swiplobjs.dir/pl-allocpool.c.o src/CMakeFiles/swiplobjs.dir/pl-wrap.c.o src/CMakeFiles/swiplobjs.dir/pl-event.c.o src/CMakeFiles/swiplobjs.dir/pl-transaction.c.o src/CMakeFiles/swiplobjs.dir/pl-undo.c.o src/CMakeFiles/swiplobjs.dir/pl-alloc.c.o src/CMakeFiles/swiplobjs.dir/pl-index.c.o src/CMakeFiles/swiplobjs.dir/pl-fli.c.o src/CMakeFiles/swiplobjs.dir/pl-coverage.c.o src/CMakeFiles/swiplobjs.dir/os/pl-buffer.c.o src/CMakeFiles/swiplobjs.dir/os/pl-ctype.c.o src/CMakeFiles/swiplobjs.dir/os/pl-file.c.o src/CMakeFiles/swiplobjs.dir/os/pl-files.c.o src/CMakeFiles/swiplobjs.dir/os/pl-glob.c.o src/CMakeFiles/swiplobjs.dir/os/pl-os.c.o src/CMakeFiles/swiplobjs.dir/os/pl-stream.c.o src/CMakeFiles/swiplobjs.dir/os/pl-string.c.o src/CMakeFiles/swiplobjs.dir/os/pl-table.c.o src/CMakeFiles/swiplobjs.dir/os/pl-text.c.o src/CMakeFiles/swiplobjs.dir/os/pl-utf8.c.o src/CMakeFiles/swiplobjs.dir/os/pl-fmt.c.o src/CMakeFiles/swiplobjs.dir/os/pl-dtoa.c.o src/CMakeFiles/swiplobjs.dir/os/pl-option.c.o src/CMakeFiles/swiplobjs.dir/os/pl-cstack.c.o src/CMakeFiles/swiplobjs.dir/os/pl-codelist.c.o src/CMakeFiles/swiplobjs.dir/os/pl-prologflag.c.o src/CMakeFiles/swiplobjs.dir/os/pl-tai.c.o src/CMakeFiles/swiplobjs.dir/os/pl-locale.c.o src/CMakeFiles/swiplobjs.dir/os/pl-apple.c.o src/CMakeFiles/swiplobjs.dir/libtai/caltime_utc.c.o src/CMakeFiles/swiplobjs.dir/libtai/caltime_tai.c.o src/CMakeFiles/swiplobjs.dir/libtai/leapsecs_sub.c.o src/CMakeFiles/swiplobjs.dir/libtai/leapsecs_add.c.o src/CMakeFiles/swiplobjs.dir/libtai/caldate_fmjd.c.o src/CMakeFiles/swiplobjs.dir/libtai/caldate_mjd.c.o src/CMakeFiles/swiplobjs.dir/libtai/leapsecs_init.c.o src/CMakeFiles/swiplobjs.dir/libtai/leapsecs_read.c.o src/CMakeFiles/swiplobjs.dir/libtai/tai_pack.c.o src/CMakeFiles/swiplobjs.dir/libtai/tai_unpack.c.o src/CMakeFiles/swiplobjs.dir/minizip/zip.c.o src/CMakeFiles/swiplobjs.dir/minizip/unzip.c.o src/CMakeFiles/swiplobjs.dir/minizip/ioapi.c.o -Wl,-rpath,::::::::::::::::::::::::::::::::::::: -lcurses -lform /lib/libgmp.so /usr/lib/libz.so -ldl -lm -lrt && : /usr/sbin/ld: /lib/libgmp.so: error adding symbols: file in wrong format collect2: error: ld returned 1 exit status ``` I do have the 32 bit version of gmp installed: ```prolog lib32-gmp /usr/ lib32-gmp /usr/lib32/ lib32-gmp /usr/lib32/gmp/ lib32-gmp /usr/lib32/gmp/gmp.h lib32-gmp /usr/lib32/gmp/gmpxx.h lib32-gmp /usr/lib32/libgmp.so lib32-gmp /usr/lib32/libgmp.so.10 lib32-gmp /usr/lib32/libgmp.so.10.4.1 lib32-gmp /usr/lib32/libgmpxx.so lib32-gmp /usr/lib32/libgmpxx.so.4 lib32-gmp /usr/lib32/libgmpxx.so.4.6.1 lib32-gmp /usr/lib32/pkgconfig/ lib32-gmp /usr/lib32/pkgconfig/gmp.pc lib32-gmp /usr/lib32/pkgconfig/gmpxx.pc ``` ---
**Author:** ![jan](https://yyz2.discourse-cdn.com/free1/user_avatar/swi-prolog.discourse.group/jan/32/4_2.png) [@jan](https://swi-prolog.discourse.group/u/jan)\ **Post date:** [August 27, 2022, 7:19am UTC](https://swi-prolog.discourse.group/t/dswipl-m32-compiling-32bit-prolog-under-64bit-host-fails/5712/2 "2022-08-27T07:19:54Z")
> [@swi](#): > > The problem maybe comes from the new gmp cmake code for wasm: Not that likely as I only added an `if(EMSCRPTEN)` section to FindGMP.cmake. There could be the clue though as I still do not understand why this section is needed and why find\_library() doesn’t do the job itself. Seems something is fishy with FindGMP.cmake ☹ ---
**Author:** ![swi](https://avatars.discourse-cdn.com/v4/letter/s/51bf81/32.png) [@swi](https://swi-prolog.discourse.group/u/swi)\ **Post date:** [August 27, 2022, 2:49pm UTC](https://swi-prolog.discourse.group/t/dswipl-m32-compiling-32bit-prolog-under-64bit-host-fails/5712/3 "2022-08-27T14:49:16Z")
> [@jan](#): > > Seems something is fishy with FindGMP.cmake I tried -DUSE\_GMP=off to see what would happen, and `libz` has the same problem: ```prolog swiplobjs.dir/minizip/ioapi.c.o -Wl,-rpath,::::::::::::::::::::::::::::::::::::: -lcurses -lform /usr/lib/libz.so -ldl -lm -lrt && : /usr/sbin/ld: /usr/lib/libz.so: error adding symbols: file in wrong format collect2: error: ld returned 1 exit status [...] ``` it is picking the 64 bit version in `/usr/lib` instead of the 32 bit version in `/usr/lib32`. No clue why. Seems the problem is more than just `FindGMP.cmake`.