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authorGravatar Yann E. MORIN <yann.morin.1998@free.fr>2015-11-03 00:34:37 +0100
committerGravatar Thomas Petazzoni <thomas.petazzoni@free-electrons.com>2015-11-03 23:50:01 +0100
commite4b1fa69cdd46ea9874de243f52c6938de19674d (patch)
treeeea0a9218313746d19cdead913c11e7e0f58118b /arch
parent4f7f86fb1de4a1e5f56adbb12bd4bff6861a2820 (diff)
downloadbuildroot-e4b1fa69cdd46ea9874de243f52c6938de19674d.tar.gz
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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" <yann.morin.1998@free.fr> Cc: Gustavo Zacarias <gustavo@zacarias.com.ar> Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Acked-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/Config.in.arm6
1 files changed, 6 insertions, 0 deletions
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