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Arcom Embedded Linux Technical Manual Developing software for AEL

Common open source build systems and cross compilation

The majority of open source software available uses configure scripts as part of the

build process. Passing the following on the command line in addition to your normal

options is often all that is required:

--host=SYSTEM-TYPE

Where SYSTEM-TYPE is the system type of the target, for example arm-linux.

‘Host’ in this context refers to the system that the final application is to run on (not to the

build system). For example:

$ ./configure --host=arm-linux [other options]

Some configure scripts accept a --target=SYSTEM-TYPE option ‘Target’ in this context

is only of relevance when building cross-compilers and similar tools, which run on one

system but produce something that runs on a different system (the target).

Not all configure scripts follow this behavior. In particular, build systems not

generated with the autoconf and automake tools are likely to not behave as

expected. Fortunately, a great many open source projects do use these tools.

Building libraries

Building libraries is similar to building applications. The libraries must be configured and

built to run on the target board. This means that the --prefix must be /usr, so that

libraries expect to be installed to /usr/lib/. However, the library and headers must also

be installed on the build system in /opt/arcom/SYSTEM-TYPE/lib and

/opt/arcom/SYSTEM-TYPE/include (where SYSTEM-TYPE is the system type, such as

arm-linux or i386-linux), so that the cross compiler and linker can use them.

With a standard automake and autoconf build system, this can be achieved by entering:

# make install prefix=/opt/arcom/arm-linux

Alternatively, you could install to /tmp/myapp-tmp and move the libraries and headers

into /opt/arcom/SYSTEM-TYPE by hand.

Installing applications and libraries on the target

Installing an application or library that uses the automake tool is normally achieved by

calling the install target, as follows:

$ make install

This causes the application or library to be installed into the host file system,

potentially causing enormous damage to the system.

Consider the consequences of replacing libc on an X86 system with a libc cross

compiled for an ARM system.

Perform the build and install of applications for the target as a non-root user on

the host system, as this can prevent the worst disasters.

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Eurotech ZEUS Bedienungsanleitung Seite 38