15.3 Software Compilation on Biarch Platforms
To develop binaries for the other architecture on a biarch architecture, the
respective libraries for the second architecture must additionally be
installed. These packages are called rpmname-32bit. You also need the respective headers and
libraries from the rpmname-devel
packages and the development libraries for the second architecture from
rpmname-devel-32bit.
Most open source programs use an
autoconf-based program configuration.
To use autoconf for configuring a
program for the second architecture, overwrite the normal compiler
and linker settings of autoconf by
running the configure script with
additional environment variables.
The following example refers to an x86_64 system with x86 as the second
architecture.
-
Use the 32-bit compiler:
CC="gcc -m32"
-
Instruct the linker to process 32-bit objects (always use gcc as the linker
front-end):
LD="gcc -m32"
-
Set the assembler to generate 32-bit objects:
AS="gcc -c -m32"
-
Determine that the libraries for libtool and so
on come from /usr/lib:
LDFLAGS="-L/usr/lib"
-
Determine that the libraries are stored in the
lib subdirectory:
--libdir=/usr/lib
-
Determine that the 32-bit X libraries are used:
--x-libraries=/usr/X11R6/lib/
Not all of these variables are needed for every program.
Adapt them to the respective program.
CC="gcc -m32" \
LDFLAGS="-L/usr/lib;" \
.configure \
--prefix=/usr \
--libdir=/usr/lib
make
make install
