Building qt 5.5.1 with TDM GCC for 32 bit Windows

[_matt.]

I have TDM GCC 64 which does support building 32 bit targets with -m32 flag.
However, no matter what flags I pass to qt's configure it always sets the architecture to 64 bits.
Is there a way to compile qt from sources with TDM GCC for 32 bit Windows?

Here are the typical flags:

configure -static -prefix C:\qt_static -release -platform win32-g++ -nomake tests -nomake examples -opengl desktop -opensource -confirm-license

Here is the output:

QMAKESPEC...................win32-g++ (commandline)
Architecture................x86_64, features: mmx sse sse2
Host Architecture...........x86_64, features: mmx sse sse2
Maketool....................mingw32-make
Debug.......................no
Force debug info............no
C++11 support...............yes
Link Time Code Generation...no
Accessibility support.......yes
RTTI support................yes
SSE2 support................yes
SSE3 support................yes
SSSE3 support...............yes
SSE4.1 support..............yes
SSE4.2 support..............yes
AVX support.................yes
AVX2 support................yes
NEON support................no
OpenGL support..............yes
Large File support..........yes
NIS support.................no
Iconv support...............no
Evdev support...............no
Mtdev support...............no
Inotify support.............no
eventfd(7) support..........no
Glib support................no
CUPS support................no
OpenVG support..............no
SSL support.................no
OpenSSL support.............no
libproxy support............no
Qt D-Bus support............no
Qt Widgets module support...yes
Qt GUI module support.......yes
QML debugging...............yes
DirectWrite support.........no
Use system proxies..........no

QPA Backends:
    GDI.....................yes
    Direct2D................no

Third Party Libraries:
    ZLIB support............qt
    GIF support.............yes
    JPEG support............yes
    PNG support.............yes
    FreeType support........yes
    Fontconfig support......no
    HarfBuzz support........qt
    PCRE support............qt
    ICU support.............no
    ANGLE...................no
    Dynamic OpenGL..........no

Styles:
    Windows.................yes
    Windows XP..............yes
    Windows Vista...........yes
    Fusion..................yes
    Windows CE..............no
    Windows Mobile..........no

Sql Drivers:
    ODBC....................no
    MySQL...................no
    OCI.....................no
    PostgreSQL..............no
    TDS.....................no
    DB2.....................no
    SQLite..................yes (qt)
    SQLite2.................no
    InterBase...............no

Sources are in..............C:\Users\GT70\Source\qt_source\qt-everywhere-opensource-src-5.5.1\qtbase
Build is done in............C:\Users\GT70\Source\qt_source\qt-everywhere-opensource-src-5.5.1\qtbase
Install prefix..............C:\qt_static
Headers installed to........C:\qt_static\include
Libraries installed to......C:\qt_static\lib
Arch-dep. data to...........C:\qt_static
Plugins installed to........C:\qt_static\plugins
Library execs installed to..C:\qt_static\bin
QML1 imports installed to...C:\qt_static\imports
QML2 imports installed to...C:\qt_static\qml
Binaries installed to.......C:\qt_static\bin
Arch-indep. data to.........C:\qt_static
Docs installed to...........C:\qt_static\doc
Translations installed to...C:\qt_static\translations
Examples installed to.......C:\qt_static\examples
Tests installed to..........C:\qt_static\tests
WARNING: Using static linking will disable the use of plugins.
         Make sure you compile ALL needed modules into the library.



Qt is now configured for building. Just run mingw32-make.
To reconfigure, run mingw32-make confclean and configure.

[SGaist]

Hi and welcome to devnet,

I'd copy the win32-g++ mkspec to e.g. win32-g++32 and add

QMAKE_CFLAGS            = -m32
QMAKE_LFLAGS            = -m32

to qmake.conf

Don't forget the license implication when using a static build.

[_matt.]

Thank you for quick reply.
I found a way to configure it to compile 32 bit architecture.
Here is what I used:

$ configure -prefix C:/qt_source -release -opengl desktop -xplatform win32-g++ -opensource -confirm-license -nomake tests -nomake examples -static -device-option CROSS_COMPILE=mingw32-

Now I hit another problem, when it is invoking archiver, it is looking for mingw32-ar, while TDM GCC's archiver is called just ar.
I tried just renaming it, but there were still issues building it. (The files are not compatible)
Do you have any ideas what to add to that?

[SGaist]

Then you may have to also add some parameters to ar, you can modify that in the qmake.conf file under QMAKE_LIB

[_matt.]

I added "--target=pei-i386" to QMAKE_LIB it so that they are 32bits.
However, I still get error:

g++ -Wl,--gc-sections -Wl,-s -Wl,-subsystem,console -o ..\..\..\bin\moc.exe .obj/release/moc.o .obj/release/preprocessor.o .obj/release/generator.o .obj/release/parser.o .obj/release/token.o .obj/release/main.o  -LC:/Users/GT70/Source/qt_source/qt-everywhere-opensource-src-5.5.1/qtbase/lib -lQt5Bootstrap -luser32 -lole32 -ladvapi32 -lshell32
C:/Users/GT70/Source/qt_source/qt-everywhere-opensource-src-5.5.1/qtbase/lib/libQt5Bootstrap.a: error adding symbols: Archive has no index; run ranlib to add one
collect2.exe: error: ld returned 1 exit status
Makefile.Release:100: recipe for target '..\..\..\bin\moc.exe' failed

There is the same error if I do not include this flag either.

[SGaist]

Did you do a clean build after you modified the mkspec ?

[_matt.]

yes I did.
I think I will switch to another tool and give it a go there, TDM GCC is not the best set up for cross compiling I guess.