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Fix handling of architecture options in compilation flags

Merged Fix handling of architecture options in compilation flags
fix-arch-options into master
Merged Marco Clemencic requested to merge fix-arch-options into master
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fragments/compilation_flags.cmake
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@@ -23,7 +23,7 @@ string(REPLACE "_" "-" LCG_ARCHITECTURE "${LCG_ARCHITECTURE}")
string(REPLACE "vecwid256" "prefer-vector-width=256" LCG_ARCHITECTURE "${LCG_ARCHITECTURE}")
# - extract main arch and options
if(LCG_ARCHITECTURE MATCHES "\\+")
string(REGEX MATCHALL "[^+]+" LCG_ARCHITECTURE_OPTIONS "${${_variable}_ARCH}")
string(REGEX MATCHALL "[^+]+" LCG_ARCHITECTURE_OPTIONS "${LCG_ARCHITECTURE}")
# the first chunk is the actual architecture
list(POP_FRONT LCG_ARCHITECTURE_OPTIONS LCG_ARCHITECTURE)
list(TRANSFORM LCG_ARCHITECTURE_OPTIONS PREPEND "-m")