Hi Everyone, This is related to Nick and Mathieu's comments about per-object flags and use of CXXFLAGS.
When I change the pattern to: CPU_FLAG = -msse2 libcpu_a_SOURCES = cpu.cpp libcpu_a_CXXFLAGS += $(CPU_FLAG) I encounter: Makefile.am:64: error: libcpu_a_CXXFLAGS must be set with '=' before using '+=' I think there are two or three issues with what I am trying to do, and the issue with "+=" is only the most prominent symptom. I think this document may be controlling: https://www.gnu.org/software/automake/manual/html_node/Flag-Variables-Ordering.html#Flag-Variables-Ordering. The paragraph that starts with "What we recommend is that you define extra flags in separate variables...." is especially interesting to me. It is interesting because `CPU_FLAG` will eventually need to be computed based on the platform. (Eventually we need: i386 gets -msse2; x86_64 gets nothing; ARMv7 gets NEON; and PowerPC gets Power4 and Altivec; others get nothing). Please forgive my ignorance, but how do I fix this issue such that it won't break when I start computing the value of CPU_FLAG in Autoconf? (And my apologies for biting off more than I can chew. I would rather invest the time to do it right once rather than applying band-aides over shoddy techniques). Jeff
