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When building OpenCV with TBB on Jetson TK1, I am hit by the problems similar to https://stackoverflow.com/a/35998110/3154588 and Assembler messages: Error: thumb conditional instruction should be in IT block -- `strexeq r1,r2,[r4]'.

However, I can't really figure out how to add -Wa,-mimplicit-it=thumb to solve the problem. I add it to CMakelists.txt file in OpenCV file, just before CMAKE_CXX_FLAGS, but it doesn't help.

/tmp/ccDH2kIW.s: Assembler messages: /tmp/ccDH2kIW.s:715: Error: thumb conditional instruction should be in IT block -- strexeq r1,r2,[r4]' /tmp/ccDH2kIW.s:1316: Error: thumb conditional instruction should be in IT block --strexeq r1,r2,[r4]' /tmp/ccDH2kIW.s:5706: Error: thumb conditional instruction should be in IT block -- strexeq r1,r2,[r4]' /tmp/ccDH2kIW.s:6001: Error: thumb conditional instruction should be in IT block --strexeq r6,r5,[r4]' /tmp/ccDH2kIW.s:6636: Error: thumb conditional instruction should be in IT block -- `strexeq r1,r3,[r7]'

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Hongyong Huang
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  • "I add it to CMakeLists" - that's not a very accurate description. Create a minimal CMake project (not OpenCV) and learn how to add `-Wa,-mimplicit-it=thumb` there. This seems to be yet another "can't isolate sub-problems" question. – MSalters Mar 10 '17 at 12:10
  • Only in CMakeFile.txt can I find out CMAKE_CXX_FLAGS…… – Hongyong Huang Mar 11 '17 at 00:36
  • Really, `-mimplicit-it` is a bandaid. The TBB template code should add `IT` instructions so that either ARM or THUMB will work. Looking at the current development releases, this seems to be fixed (`__TBB_machine_xxx()` in gcc_armv7.h in TBB source. Use tbb-2017 update 5 if possible. – artless noise Mar 11 '17 at 16:18

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