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core: add BR2_HOSTARCH_NEEDS_IA32_COMPILER option

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Some bootloaders (such as Grub) need to be built for x86 (i.e IA32)
even if the target architecture is x86-64. However, when the target
architecture is x86-64, the cross-compiler generated by Buildroot is
not able to generate 32 bits code.

To solve this, we will rely on the host compiler being a x86 + x86-64
compiler. Therefore, this commit introduces the
BR2_HOSTARCH_NEEDS_IA32_COMPILER option, which tells the dependency
checking logic to verify that the host compiler is indeed capable of
building x86 32 bits code.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
This commit is contained in:
Thomas Petazzoni 2013-11-11 17:47:25 +01:00 committed by Peter Korsgaard
parent 971795f55a
commit 0e4bc50210
2 changed files with 15 additions and 0 deletions
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6
Config.in
View File

@ -20,6 +20,12 @@ config BR2_HOSTARCH
config BR2_HOSTARCH_NEEDS_IA32_LIBS
bool
# Hidden boolean selected by packages that need to build 32 bits
# binaries with the host compiler, even on 64 bits build machines (e.g
# bootloaders).
config BR2_HOSTARCH_NEEDS_IA32_COMPILER
bool
source "arch/Config.in"
menu "Build options"

9
support/dependencies/dependencies.sh
View File

@ -186,6 +186,15 @@ if grep -q ^BR2_HOSTARCH_NEEDS_IA32_LIBS=y $BUILDROOT_CONFIG ; then
fi
fi
if grep -q ^BR2_HOSTARCH_NEEDS_IA32_COMPILER=y $BUILDROOT_CONFIG ; then
if ! echo "int main(void) {}" | gcc -m32 -x c - ; then
/bin/echo -e "\nYour Buildroot configuration needs a compiler capable of building 32 bits binaries."
/bin/echo -e "If you're running a Debian/Ubuntu distribution, install the gcc-multilib package."
/bin/echo -e "For other distributions, refer to their documentation."
exit 1
fi
fi
# Check that the Perl installation is complete enough to build
# host-autoconf.
if ! perl -e "require Data::Dumper" > /dev/null 2>&1 ; then