core: add BR2_HOSTARCH_NEEDS_IA32_COMPILER option

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>

1 files changed, 6 insertions, 0 deletions

diff --git a/Config.in b/Config.in
index d87e0f0c5..677fff620 100644
--- a/Config.in
+++ b/Config.in
@@ -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"