[Bug 1624610] Re: Can't build a 32-bit GTK2 app on a 64-bit system

[Matthias Klose]

you should install crossbuild-essential-i386 and try to build with dpkg-
buildpackage -a i386

** Changed in: gcc-defaults (Ubuntu)
       Status: New => Invalid

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Title:
  Can't build a 32-bit GTK2 app on a 64-bit system

Status in gcc-defaults package in Ubuntu:
  Invalid

Bug description:
  Description:	Ubuntu 16.04.1 LTS
  Release:	16.04

  gcc-multilib:
    Installed: 4:5.3.1-1ubuntu1
    Candidate: 4:5.3.1-1ubuntu1

  apt install build-essential gcc-multilib libgtk2.0-dev

  The build fails because there is only 64-bit version of glibconfig.h is installed:
  /usr/lib/x86_64-linux-gnu/glib-2.0/include/glibconfig.h

  Running gcc -m32 gives an error:
  /usr/include/glib-2.0/glib/gtypes.h:422:3: error: '_GStaticAssertCompileTimeAssertion_0' declared as an array with a negative size
  G_STATIC_ASSERT(sizeof (unsigned long long) == sizeof (guint64));
  because guint64 is defined as (unsigned long) on a 64-bit platform.

  Also, there is no 32-bit version of the "pkgconfig" files, so you can't use:
  $(pkg-config --cflags gtk+-2.0) with, for example, PKG_CONFIG_PATH=/usr/lib32/pkgconfig.

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