32bit Compile Fails

[shoober420]

I've been trying to compile OpenAL from the master. I have successfully compiled it for 64bit, but not for 32bit. No matter what CMAKE options I try, it still fails. Here is the error.

[100%] Linking CXX executable ../../alsoft-config
/usr/lib/libQt5Widgets.so.5.8.0: error adding symbols: File in wrong format
collect2: error: ld returned 1 exit status
make[2]: *** [utils/alsoft-config/CMakeFiles/alsoft-config.dir/build.make:158: alsoft-config] Error 1
make[1]: *** [CMakeFiles/Makefile2:525: utils/alsoft-config/CMakeFiles/alsoft-config.dir/all] Error 2
make: *** [Makefile:130: all] Error 2
==> ERROR: A failure occurred in build().
    Aborting...

This is compiling on Arch Linux 64bit. Here is my PKGBUILD with all the options.

_pkgbasename=openal
_gitname=openal-soft
pkgname=lib32-openal-git
pkgver=1.17.2
pkgrel=1
pkgdesc="A cross-platform 3D audio library (32-bit)"
arch=(x86_64)
url="https://github.com/kcat/openal-soft"
license=(LGPL)
depends=(lib32-glibc $_pkgbasename)
makedepends=(lib32-alsa-lib pkgconfig cmake lib32-libpulse lib32-portaudio lib32-jack
             git gcc-multilib lib32-ffmpeg lib32-sdl_sound)
source=("git+$url")
sha256sums=('SKIP')

prepare() {
  mkdir build
  cd $_gitname
}

build() {
  export CC="gcc -m32"
  export CXX="g++ -m32"
  export PKG_CONFIG_PATH="/usr/lib32/pkgconfig"

  cd build
  cmake -D CMAKE_INSTALL_PREFIX=/usr -D CMAKE_INSTALL_LIBDIR=/usr/lib32 -D CMAKE_BUILD_TYPE=Release -D LIB_SUFFIX=32 ../$_gitname
  make
}

package() {
  optdepends=('lib32-qt5-base-bin: alsoft-config GUI Configurator'
              'lib32-fluidsynth: MIDI rendering')

  make -C build DESTDIR="$pkgdir/" install
  rm -rf "$pkgdir"/usr/{include,share,bin}
}

[kcat]

Looks like an issue with the Qt5 dev packages, that cmake's picking up a 64-bit lib instead of a 32-bit one. Are you sure the 32-bit versions of the necessary packages are installed? I'm not too familiar with Arch so I'm not sure exactly which packages you need, but alsoft-config uses Qt5Widgets.

[shoober420]

Yes, I have the 32bit qt5 libs installed. They are located in /usr/lib32. Is there a way I can force cmake to look for the qt5 libs in /usr/lib32 instead of /usr/lib?

I made a thread about on the Arch Linux forums and we still haven't figured it out.

https://bbs.archlinux.org/viewtopic.php?id=225588

[kcat]

From my reading of https://doc.qt.io/qt-5/cmake-manual.html:

"In order for find_package to be successful, Qt 5 must be found below the CMAKE_PREFIX_PATH, or the Qt5_DIR must be set in the CMake cache to the location of the Qt5WidgetsConfig.cmake file. The easiest way to use CMake is to set the CMAKE_PREFIX_PATH environment variable to the install prefix of Qt 5."

With CMAKE_PREFIX_PATH set to /usr by default (I presume), CMake might be getting confused with both /usr/lib/cmake/Qt5Widgets and /usr/lib32/cmake/Qt5Widgets existing, so find_package(Qt5Widgets) just "randomly" picks one. Unless there's some other trick Arch Linux has to tell CMake to look in lib32/cmake instead of lib/cmake, it seems you need to explicitly tell it where to look for the Widgets module and its dependencies (Gui and Core):
cmake .. -DQt5Widgets_DIR=/usr/lib32/cmake/Qt5Widgets -DQt5Gui_DIR=/usr/lib32/cmake/Qt5Gui -DQt5Core_DIR=/usr/lib32/cmake/Qt5Core

[shoober420]

It still fails to compile even when adding those setting. It still looks in the /usr/lib directory instead of /usr/lib32. It's the same error.

[kcat]

That was with a clean build directory?

What does your /usr/lib32/cmake/Qt5Widgets/Qt5WidgetsConfig.cmake look like? Does the get_filename_component(_realOrig ...) line have the correct lib32path?

[shoober420]

It appears that it does.

if (CMAKE_VERSION VERSION_LESS 2.8.3)
    message(FATAL_ERROR "Qt 5 requires at least CMake version 2.8.3")
endif()

get_filename_component(_IMPORT_PREFIX "${CMAKE_CURRENT_LIST_FILE}" PATH)
 Use original install prefix when loaded through a
 cross-prefix symbolic link such as /lib -> /usr/lib32.
get_filename_component(_realCurr "${_IMPORT_PREFIX}" REALPATH)
get_filename_component(_realOrig "/usr/lib32/cmake/Qt5Widgets" REALPATH)
if(_realCurr STREQUAL _realOrig)
    get_filename_component(_qt5Widgets_install_prefix "/usr/lib32/../" ABSOLUTE)
else()
    get_filename_component(_qt5Widgets_install_prefix "${CMAKE_CURRENT_LIST_DIR}/../../../" ABSOLUTE)
endif()
unset(_realOrig)
unset(_realCurr)
unset(_IMPORT_PREFIX)

[kcat]

Seems there's a couple lines down a bit farther,
set(imported_location "${_qt5Widgets_install_prefix}...)
do they have the correct lib32 path too?

If so, I'm not sure. Do other cmake projects that use Qt5 work when built for 32-bit?

[shoober420]

You're a fricking genius. Built Successfully. Thank you so much kcat.