13.3 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/lib/xorg
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
