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arm/thumb: outputs an implicit IT block to avoid build break

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Fix build break on thumb2 mode:
opus/celt/arm/celt_pitch_xcorr_arm-gnu.S: Assembler messages:
opus/celt/arm/celt_pitch_xcorr_arm-gnu.S:146: Error: thumb conditional instruction should be in IT block -- `movle pc,lr'

Reference:
https://developer.arm.com/documentation/100067/0612/armclang-Command-line-Options/-mimplicit-it

In A32 code, the integrated assembler accepts all conditional instructions
without giving an error or warning. In T32 code, the integrated assembler
outputs an implicit IT block when there is a conditional instruction
without an enclosing IT block. The integrated assembler does not give an
error or warning about this.

Signed-off-by: chao an <anchao@xiaomi.com>
This commit is contained in:
chao an 2022-12-02 03:03:57 +08:00 • committed by Petro Karashchenko
parent 9ab97df0a5
commit 77aede7c87
1 changed files with 5 additions and 0 deletions
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5
arch/arm/src/common/Toolchain.defs
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@ -80,6 +80,11 @@ ifeq ($(CONFIG_ARM_THUMB),y)
# -mthumb option directly to the assembler by prefixing it with -Wa.
ARCHOPTIMIZATION += -Wa,-mthumb
# Outputs an implicit IT block when there is a conditional instruction
# without an enclosing IT block.
ARCHOPTIMIZATION += -Wa,-mimplicit-it=always
endif
ifeq ($(CONFIG_UNWINDER_ARM),y)