CONFIG: improve support for compiler derivatives (#1671)
- add '[-+.~]' to the recognized qualifiers. This allows simple readable names such as WM_COMPILER=Clang-vendor but also opens the FUTURE (not yet supported) possibility of combining in additional information. For example, WM_COMPILER=Clang~openmp WM_COMPILER=Clang+cuda~openmp by using '+' (add) and '~' (subtract) notation similar to what spack uses. CONFIG: support 'override' rules - if present, compiler-family 'override' rules are included after compiler-family 'general' rules have been included. This allows a central means for including dynamically generated content to override some values. Some examples: To handle different gcc versions (system compiler): wmake/rules/...Gcc/override ``` ifneq (,$(findstring 9, $(WM_COMPILER))) cc := gcc-9 CC := g++-9 -std=c++11 endif ``` To handle different openmp on Darwin (#1656): wmake/rules/darwin64Clang/override ``` # Use libomp (not libgomp) unless openmp is disabled ifeq (,$(findstring "~openmp", "$(WM_COMPILER)")) COMP_OPENMP = -DUSE_OMP -Xpreprocessor -fopenmp LINK_OPENMP = -lomp else include $(GENERAL_RULES)/no-openmp endif ``` This treatment arguably fits into wmake/rules/darwin64Clang/general, but it serves to illustrate a possible use case.
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