Undefined symbols for architecture x86_64 on jsonnet submission

[Steven Smith]

> You need to try and isolate the one causing the issue, if you believe it is something MacPorts is appending to the env, and then address that specifically.

That’s what I’m asking for help to do.

How are these flags and environment variables set within a Portfile?

I don’t know enough about the MacPorts build design or clang options enough to go through all the combinatoric flag settings, or to divide-and-conquer the problem.

Here are the flags set by Google’s upstream repo, <https://github.com/google/jsonnet/blob/master/Makefile>:
> CXXFLAGS ?= -g $(OPT) -Wall -Wextra -Woverloaded-virtual -pedantic -std=c++0x -fPIC
> CXXFLAGS += -Iinclude -Ithird_party/md5 -Ithird_party/json
> CFLAGS ?= -g $(OPT) -Wall -Wextra -pedantic -std=c99 -fPIC
> CFLAGS += -Iinclude
> MAKEDEPENDFLAGS += -Iinclude -Ithird_party/md5 -Ithird_party/json
> EMCXXFLAGS = $(CXXFLAGS) -g0 -Os --memory-init-file 0 -s DISABLE_EXCEPTION_CATCHING=0 -s OUTLINING_LIMIT=10000 -s RESERVED_FUNCTION_POINTERS=20 -s ASSERTIONS=1 -s ALLOW_MEMORY_GROWTH=1
> EMCFLAGS = $(CFLAGS) --memory-init-file 0 -s DISABLE_EXCEPTION_CATCHING=0 -s ASSERTIONS=1 -s ALLOW_MEMORY_GROWTH=1
> LDFLAGS ?=


How are these variables and flags unset/reset within a Portfile?

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