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e8c6281f13
Details:
- Added logic to configure that checks the version of the compiler
against known version ranges that could cause problems later in the
build process. For example, versions of gcc older than 4.9.0 use
different -march labels than version 4.9.0 or later
('-march=corei7-avx' vs '-march=sandybridge', respectively).
Similarly, before 6.1, compilation on Zen was possible, but you
need to start with -march=bdver4 and then disable instruction sets
that were discarded during the transition from Excavator to Zen. So
now, configure substitutes 'yes'/'no' values into anchors in
config.mk.in, which sets various make variables (e.g. GCC_OT_4_9_0),
which can be accessed and branched upon by the various
configurations' make_defs.mk files when setting their compiler flags.
- Updated config/haswell/make_defs.mk to branch on GCC_OT_4_9_0.
- Updated config/sandybridge/make_defs.mk to branch on GCC_OT_4_9_0.
- Updated config/zen/make_defs.mk to branch on GCC_OT_6_1_0.