Commit 09ff191c authored by Committed by Brad King
Fix FindPackageMode test Makefile (#13314)
Use CXXFLAGS in the makefile's link rule since it invokes the C++ compiler front-end. Retool the makefile not to require GNU Make. Using backticks instead of $(shell ...) is safe so long as one guards against the possibility of backslashes getting inside the backticks, so use temporary files and shell variables to avoid them.
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