sim: common: add $LINENO rewriting support to genmloop scripts
The generated mloop files can trigger compile time warnings. It can
be difficult to see/understand where the original code is coming from
as all the diagnostics point to the generated output. Using #line
pragmas, we can point people to the original source files.
Unfortunately, this code is written in POSIX shell, and that lacks
support for line number tracking. The $LINENO variable, even when
available, can just be plain wrong. For example, when using dash
and subshells, $LINENO can end up having negative values. Add a
wrapper script that will uses awk to rewrite the $LINENO variable
to the right value to avoid all that.
Basically lineno.sh takes an input script, rewrites all uses of
$LINENO into the actual line number (and $0 into the original file
name), and then executes the temporary script.
This commit doesn't actually add #line pragmas to any files. That
comes next.
4 files changed
