Cannot use variables in the defines sction in project.yml

[tiagomanczak]

I want to pass defines to Ceedling using variables like in my project file below:

---

# Notes:
# Sample project C code is not presently written to produce a release artifact.
# As such, release build options are disabled.
# This sample, therefore, only demonstrates running a collection of unit tests.
:environment:
    - my_test_define: "{`echo | set /p= %MY_DEFINE%`}"

:project:
  :use_exceptions: FALSE
  :use_test_preprocessor: TRUE
  :use_auxiliary_dependencies: TRUE
  :build_root: build
#  :release_build: TRUE
  :test_file_prefix: test_
  :which_ceedling: gem
  :default_tasks:
    - test:all

#:release_build:
#  :output: MyApp.out
#  :use_assembly: FALSE

:environment:

:extension:
  :executable: .out

:paths:
  :test:
    - +:test/**
    - -:test/support
  :source:
    - src/**
  :support:
    - test/support

:defines:
  # in order to add common defines:
  #  1) remove the trailing [] from the :common: section
  #  2) add entries to the :common: section (e.g. :test: has TEST defined)
  :common: &common_defines []
  :test:
    - *common_defines
    - TEST
    - "#{ENV['MY_TEST_DEFINE']}"
  :test_preprocess:
    - *common_defines
    - TEST
    - "#{ENV['MY_TEST_DEFINE']}"

:cmock:
  :mock_prefix: mock_
  :when_no_prototypes: :warn
  :enforce_strict_ordering: TRUE
  :plugins:
    - :ignore
    - :callback
  :treat_as:
    uint8:    HEX8
    uint16:   HEX16
    uint32:   UINT32
    int8:     INT8
    bool:     UINT8

:gcov:
    :html_report: true # Enables the output of an HTML report for utils:gcov
    :html_report_type: basic  # Options are 'basic' or 'detailed'.
    :xml_report: false # Enables the output of an XML report for utils:gcov

#:tools:
# Ceedling defaults to using gcc for compiling, linking, etc.
# As [:tools] is blank, gcc will be used (so long as it's in your system path)
# See documentation to configure a given toolchain for use

# LIBRARIES
# These libraries are automatically injected into the build process. Those specified as
# common will be used in all types of builds. Otherwise, libraries can be injected in just
# tests or releases. These options are MERGED with the options in supplemental yaml files.
:libraries:
  :placement: :end
  :flag: "${1}"  # or "-L ${1}" for example
  :common: &common_libraries []
  :test:
    - *common_libraries
  :release:
    - *common_libraries

:plugins:
  :load_paths:
    - "#{Ceedling.load_path}"
  :enabled:
    - stdout_pretty_tests_report
    - module_generator
...

But when I call the command ceedling on this I get the following error message, where we can see the define was not resolved by ceedling and it is still -D#{ENV['MY_TEST']} and not the content of the Environment Variable as I expected like -DMY_DEFINE_A.

Test 'test_check_define.c'
--------------------------
<command-line>: error: macro names must be identifiers
<command-line>: error: macro names must be identifiers
ERROR: Shell command failed.
> Shell executed command:
'gcc.exe -E -MM -MG -I"C:/Ruby25/lib/ruby/gems/2.5.0/gems/ceedling-0.31.1/vendor/unity/src" -I"C:/Ruby25/lib/ruby/gems/2.5.0/gems/ceedling-0.31.1/vendor/cmock/src" -I"build/test/mocks" -I"test" -I"test/support" -I"src" -DTEST -D#{ENV['MY_TEST']} -DTEST -D#{ENV['MY_TEST']} -DGNU_COMPILER "build/temp/_test_check_define.c"'
> Produced output:
_test_check_define.o: build/temp/_test_check_define.c \
 C:/Ruby25/lib/ruby/gems/2.5.0/gems/ceedling-0.31.1/vendor/unity/src/unity.h \
 C:/Ruby25/lib/ruby/gems/2.5.0/gems/ceedling-0.31.1/vendor/unity/src/unity_internals.h \
 @@@@unity.h
> And exited with status: [1].

rake aborted!
ShellExecutionException: ShellExecutionException
c:/Ruby25/bin/ceedling:23:in `load'
c:/Ruby25/bin/ceedling:23:in `<main>'
Tasks: TOP => default => test:all
(See full trace by running task with --trace)
ERROR: Ceedling Failed

For other sections line project or paths it the same approach with variables works, but for the defines not. How can I get it working for the defines?

[mkarlesky]

This long ago requested feature will be implemented with a coming pre-release version of the latest Ceedling as discussed in #879.