Build error on hitags

[JohnDoeIsKIng]

Dear community,

last week I encountered an error during building. The error evolved on the target hitags.
Here 's the build log:
compiler version: arm-none-eabi-gcc (15:6.3.1+svn253039-1build1) 6.3.1 20170620 [-] GEN fpga_version_info.c [-] CC fpga_version_info.c [-] GEN obj/fpga_all.bit.z [-] GEN obj/fpga_all.o [-] CC start.c [-] CC iso15693.c [-] CC ../common/iso15693tools.c [-] CC thinfilm.c [-] CC lfops.c [-] CC lfsampling.c [-] CC pcf7931.c [-] CC ../common/lfdemod.c [-] CC lfadc.c [-] CC ../common/lz4/lz4.c [-] CC legicrf.c [-] CC legicrfsim.c [-] CC ../common/legic_prng.c [-] CC ../common/hitag2/hitag2_crypto.c [-] CC hitag2.c [-] CC hitagS.c hitagS.c: In function 'hts_select_tag': hitagS.c:1158:13: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing] key_le = *(uint64_t *)packet->key; ^~~~~~ hitagS.c:1160:13: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing] uint64_t state = ht2_hitag2_init(reflect48(key_le), reflect32(tag.data.s.uid_le), reflect32(*(uint32_t *)rnd)); ^~~~~~~~ hitagS.c:1252:13: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing] uint64_t state = ht2_hitag2_init(reflect48(key_le), reflect32(tag.data.s.uid_le), reflect32(*(uint32_t *)rnd)); ^~~~~~~~ cc1: all warnings being treated as errors ../common_arm/Makefile.common:118: recipe for target 'obj/hitagS.o' failed make[1]: *** [obj/hitagS.o] Error 1 Makefile:167: recipe for target 'armsrc/all' failed make: *** [armsrc/all] Error 2

john@pc:~/Githubs/proxmark3$ cc --version cc (Ubuntu 10.3.0-1ubuntu1~18.04~1) 10.3.0

Any hints to solve that are appreciated.
Best regards

JD.

[iceman1001]

No idea. GH Actions doesn't show any build errors or warnings.

Have you cleaned your env? make clean; make -j ?

[JohnDoeIsKIng]

Greets iceman,

yes I have cleaned and build new.
The issue seems to relate to a compiler standard, see here:

https://stackoverflow.com/questions/7630150/dereferencing-type-punned-pointer-will-break-strict-aliasing-rules

I will try to build a fix and come back.
Regards

JD.