From e4b1fa69cdd46ea9874de243f52c6938de19674d Mon Sep 17 00:00:00 2001 From: "Yann E. MORIN" Date: Tue, 3 Nov 2015 00:34:37 +0100 Subject: [PATCH] arch/arm: VFP and Thumb1 are not compatible gcc will refuse to build with both --with-mode=thumb and --with-fpu=vfp, with error messages during ./configure, like: checking for suffix of object files... configure: error: in `/home/ymor in/dev/buildroot/O/build/host-gcc-initial-4.9.3/build/arm-buildroot-lin ux-uclibcgnueabihf/libgcc': configure: error: cannot compute suffix of object files: cannot compile See `config.log' for more details. And config.log informatively contains: sorry, unimplemented: Thumb-1 hard-float VFP ABI This is an error message that comes deep from gcc source files. If gcc says it does not support VFP with Thumb1, then let's disable that combination in our menuconfig. Prefer VFP over Thumb1, i.e. hide Thumb1 when we're not soft-float. Signed-off-by: "Yann E. MORIN" Cc: Gustavo Zacarias Cc: Thomas Petazzoni Acked-by: Arnout Vandecappelle (Essensium/Mind) Signed-off-by: Thomas Petazzoni --- arch/Config.in.arm | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/Config.in.arm b/arch/Config.in.arm index db7b8f2cb4..67ff384b7d 100644 --- a/arch/Config.in.arm +++ b/arch/Config.in.arm @@ -377,12 +377,18 @@ config BR2_ARM_INSTRUCTIONS_ARM config BR2_ARM_INSTRUCTIONS_THUMB bool "Thumb" depends on BR2_ARM_CPU_HAS_THUMB + # Thumb-1 and VFP are not compatible + depends on BR2_ARM_SOFT_FLOAT help This option instructions the compiler to generate Thumb instructions, which allows to mix 16 bits instructions and 32 bits instructions. This generally provides a much smaller compiled binary size. +comment "Thumb1 is not compatible with VFP" + depends on BR2_ARM_CPU_HAS_THUMB + depends on !BR2_ARM_SOFT_FLOAT + config BR2_ARM_INSTRUCTIONS_THUMB2 bool "Thumb2" depends on BR2_ARM_CPU_HAS_THUMB2 -- 2.30.2