make: fix confusing debug logging when deleting a variable

Be clear when deleting a variable is ignored and state the reason,
instead of only providing a keyword as a hint for insiders.

make: add space after colon in debug logging for variables

These log messages are intended for human interpretation, so don't make
them unnecessarily hard to read.

make: make debug logging for comparisons less technical

make: in debug log, add space between scope and variable name

Without this space, the debug log looked more like line noise, even
though the only punctuation was a single innocent ':'. From a make
user's perspective, the variable name is a word of its own and should
not be visually glued to its namespace.

make: change debug log for variable evaluation flags to lowercase

This makes them easier distinguishable from variable names since the
latter are usually uppercase.

No functional change outside debug mode.

make(1): add more tests for parsing .MAKEFLAGS lines

make(1): add test for dollar in .MAKEFLAGS target

make(1): add dummies for fine-grained tests, one per single feature

The test names have been derived from the current manual page.

All these tests are dummies right now, and the code from the existing
tests will be moved into the new tests step by step.

This is done to prevent modmisc, escape, varmod-edge and varmisc from
growing without any bounds, and to reduce the side-effects of one test
to the others.

make: add space after colon in debug logging for variables

These log messages are intended for human interpretation, so don't make
them unnecessarily hard to read.

make: make debug logging for comparisons less technical

make: in debug log, add space between scope and variable name

Without this space, the debug log looked more like line noise, even
though the only punctuation was a single innocent ':'. From a make
user's perspective, the variable name is a word of its own and should
not be visually glued to its namespace.

make: change debug log for variable evaluation flags to lowercase

This makes them easier distinguishable from variable names since the
latter are usually uppercase.

No functional change outside debug mode.

make(1): add more tests for parsing .MAKEFLAGS lines

make(1): add test for dollar in .MAKEFLAGS target

make(1): add dummies for fine-grained tests, one per single feature

The test names have been derived from the current manual page.

All these tests are dummies right now, and the code from the existing
tests will be moved into the new tests step by step.

This is done to prevent modmisc, escape, varmod-edge and varmisc from
growing without any bounds, and to reduce the side-effects of one test
to the others.

make: make debug logging for comparisons less technical

make: in debug log, add space between scope and variable name

Without this space, the debug log looked more like line noise, even
though the only punctuation was a single innocent ':'. From a make
user's perspective, the variable name is a word of its own and should
not be visually glued to its namespace.

make: change debug log for variable evaluation flags to lowercase

This makes them easier distinguishable from variable names since the
latter are usually uppercase.

No functional change outside debug mode.

make(1): add more tests for parsing .MAKEFLAGS lines

make(1): add test for dollar in .MAKEFLAGS target

make(1): add dummies for fine-grained tests, one per single feature

The test names have been derived from the current manual page.

All these tests are dummies right now, and the code from the existing
tests will be moved into the new tests step by step.

This is done to prevent modmisc, escape, varmod-edge and varmisc from
growing without any bounds, and to reduce the side-effects of one test
to the others.

make: in debug log, add space between scope and variable name

Without this space, the debug log looked more like line noise, even
though the only punctuation was a single innocent ':'. From a make
user's perspective, the variable name is a word of its own and should
not be visually glued to its namespace.

make: change debug log for variable evaluation flags to lowercase

This makes them easier distinguishable from variable names since the
latter are usually uppercase.

No functional change outside debug mode.

make(1): add more tests for parsing .MAKEFLAGS lines

make(1): add test for dollar in .MAKEFLAGS target

make(1): add dummies for fine-grained tests, one per single feature

The test names have been derived from the current manual page.

All these tests are dummies right now, and the code from the existing
tests will be moved into the new tests step by step.

This is done to prevent modmisc, escape, varmod-edge and varmisc from
growing without any bounds, and to reduce the side-effects of one test
to the others.

make: change debug log for variable evaluation flags to lowercase

This makes them easier distinguishable from variable names since the
latter are usually uppercase.

No functional change outside debug mode.

make(1): add more tests for parsing .MAKEFLAGS lines

make(1): add test for dollar in .MAKEFLAGS target

make(1): add dummies for fine-grained tests, one per single feature

The test names have been derived from the current manual page.

All these tests are dummies right now, and the code from the existing
tests will be moved into the new tests step by step.

This is done to prevent modmisc, escape, varmod-edge and varmisc from
growing without any bounds, and to reduce the side-effects of one test
to the others.

make(1): add more tests for parsing .MAKEFLAGS lines

make(1): add test for dollar in .MAKEFLAGS target

make(1): add dummies for fine-grained tests, one per single feature

The test names have been derived from the current manual page.

All these tests are dummies right now, and the code from the existing
tests will be moved into the new tests step by step.

This is done to prevent modmisc, escape, varmod-edge and varmisc from
growing without any bounds, and to reduce the side-effects of one test
to the others.

make(1): add test for dollar in .MAKEFLAGS target

make(1): add dummies for fine-grained tests, one per single feature

The test names have been derived from the current manual page.

All these tests are dummies right now, and the code from the existing
tests will be moved into the new tests step by step.

This is done to prevent modmisc, escape, varmod-edge and varmisc from
growing without any bounds, and to reduce the side-effects of one test
to the others.

make(1): add dummies for fine-grained tests, one per single feature

The test names have been derived from the current manual page.

All these tests are dummies right now, and the code from the existing
tests will be moved into the new tests step by step.

This is done to prevent modmisc, escape, varmod-edge and varmisc from
growing without any bounds, and to reduce the side-effects of one test
to the others.