diff options
| author | Yann E. MORIN <yann.morin.1998@free.fr> | 2015-11-03 00:34:37 +0100 |
|---|---|---|
| committer | Thomas Petazzoni <thomas.petazzoni@free-electrons.com> | 2015-11-03 23:50:01 +0100 |
| commit | e4b1fa69cdd46ea9874de243f52c6938de19674d (patch) | |
| tree | eea0a9218313746d19cdead913c11e7e0f58118b /arch/Config.in.arm | |
| parent | 4f7f86fb1de4a1e5f56adbb12bd4bff6861a2820 (diff) | |
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/Config.in.arm')
| -rw-r--r-- | arch/Config.in.arm | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/Config.in.arm b/arch/Config.in.arm index db7b8f2cb..67ff384b7 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 |