Discover module and #include dependencies for a given file.

To be useful, giraffe needs to know the include paths and #define macros being using by your project's gcc installation. This information can be discovered like so:

# Print out include paths, and #define macros.
# Use 'gcc' for C code. Don't forget to specify
# any additional command line options.
gcc -x c++ -dM -E -Wp,-v - </dev/null

Once the correct set of command line options is specified, save the output to a configuration file that is later loaded into giraffe.

# Example, using C++20. Note use of 2>&1 to capture include paths.
gcc -x c++ -std=c++20 -dM -E -Wp,-v - </dev/null 1>g++-config.text 2>&1

• TODO, very minimal example Makefile
• Example with run.sh

• Intended for gcc -- would not be hard to support clang.
• Have to supply the installation path for system libraries.
• No sizeof operator in constant expressions.
• All constant expressions are treated as integers.

• Roll eval-context into context, including symbol table
• Scanner built from token sequence
• Diagnostics to store their own error messages