[Buildroot] [PATCH 2/4] Infrastructure to warn the user about missing 32 bits libraries
arnout at mind.be
Mon Jan 7 07:55:06 UTC 2013
On 12/29/12 17:14, Thomas Petazzoni wrote:
> Many users trying to use external toolchains on x86-64 machines get a
> very confusing message:
> "Can't execute cross-compiler"
> They get this message because they forgot to install the 32 bits
> compatibility libraries that are needed to run binaries compiled for
> x86 on x86-64 machines.
> Since this is the case for both external toolchains and certain
> binary-only tools like SAM-BA, we add a new Kconfig option
> BR2_HOSTARCH_NEEDS_IA32_LIBS, that packages must select if they need
Since x86_64 is also an IA32, I would rather call it
> the 32 bits compatibility libraries. When this option is enabled,
> dependencies.sh checks that the 32 bits dynamic library loader is
> present on the system, and if not, it stops and shows an error.
> The path and name of the 32 bits dynamic loader is hardcoded because
> it is very unlikely to change, as it would break the ABI for all
> Also, it is worth noting that the check will be done even if we're
> running on a 32 bits machine. This is harmless, as 32 bits machines
> necessarily have the 32 bits dynamic loader installed, so the error
> will never show up in this case.
Perhaps move these two comments to dependencies.sh so we don't forget
> Signed-off-by: Thomas Petazzoni<thomas.petazzoni at free-electrons.com>
Acked-by: Arnout Vandecappelle (Essensium/Mind) <arnout at mind.be>
> Config.in | 6 ++++++
> support/dependencies/dependencies.sh | 11 +++++++++++
> 2 files changed, 17 insertions(+)
> diff --git a/Config.in b/Config.in
> index b319ac7..af77a83 100644
> --- a/Config.in
> +++ b/Config.in
> @@ -14,6 +14,12 @@ config BR2_HOSTARCH
> option env="HOSTARCH"
> +# Hidden boolean selected by pre-built packages for x86, when they
> +# need to run on x86-64 machines (example: pre-built external
> +# toolchains, binary tools like SAM-BA, etc.).
> +config BR2_HOSTARCH_NEEDS_IA32_LIBS
> + bool
> source "arch/Config.in"
> menu "Build options"
> diff --git a/support/dependencies/dependencies.sh b/support/dependencies/dependencies.sh
> index 7a02512..03e2742 100755
> --- a/support/dependencies/dependencies.sh
> +++ b/support/dependencies/dependencies.sh
> @@ -166,3 +166,14 @@ if grep -q ^BR2_PACKAGE_CLASSPATH=y $CONFIG_FILE ; then
> +if grep -q ^BR2_HOSTARCH_NEEDS_IA32_LIBS=y $CONFIG_FILE ; then
> + if test ! -f /lib/ld-linux.so.2 ; then
> + /bin/echo -e "\nYour Buildroot configuration uses some pre-built tools for the x86 architecture,"
> + /bin/echo -e "but your build machine uses the x86-64 architecture without the 32 bits compatibility"
This line is more than 80 columns.
> + /bin/echo -e "library."
> + /bin/echo -e "If you're running a Debian/Ubuntu distribution, install the libc:i386 package."
> + /bin/echo -e "For other distributions, refer to the documentation on how to install the 32 bits"
> + /bin/echo -e "compatibility libraries."
"the documentation" sounds as if it is the buildroot documentation, so
make it "refer to your distribution's documentation"
Also this is only for relatively recent Debian/Ubuntu with full
multilib support. Before that it was called libc-i386 IIRC.
Is there anyone out there with a Redhat/Fedora who can tell us how to
install it there?
And finally, it would be good to mention this in
> + exit 1
> + fi
Arnout Vandecappelle arnout at mind be
Senior Embedded Software Architect +32-16-286500
G.Geenslaan 9, 3001 Leuven, Belgium BE 872 984 063 RPR Leuven
LinkedIn profile: http://www.linkedin.com/in/arnoutvandecappelle
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