make: simplify code for evaluating the '!=' variable assignment

An undefined variable evaluates to an empty string, without an error
message.

make: simplify parsing of dependency lines

The evaluation modes that allow or deny undefined variables have the same
effect in this case, as Var_Subst does not return an error marker.

make: in the debug log, always qualify line number with filename

Previously, to find out the filename corresponding to a line number from
a 'Parsing' line, it was necessary to find the preceding
'Se

make: in the debug log, always qualify line number with filename

Previously, to find out the filename corresponding to a line number from
a 'Parsing' line, it was necessary to find the preceding
'SetFilenameVars' line, which was unnecessarily time-consuming and
distracting.

The 'filename:line' format matches the one used in PrintStackTrace, and
it differs from the one used in PrintLocation, as the former format is
more common in other tools.

Most of the affected unit tests only use the 'Parsing' lines to give
additional context to their debug log, so no structural changes there.

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make: reduce line length in error messages

The error messages for deeply nested parse errors were hard to decipher,
due to the large amount of text. Split these messages into individual
lines, just

make: reduce line length in error messages

The error messages for deeply nested parse errors were hard to decipher,
due to the large amount of text. Split these messages into individual
lines, just as in the backtrace for .include files and .for loops. This
unified backtrace makes the output more uniform.

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make: error out on parse/evaluation errors in shell commands

The expression ${VAR:X} has an unknown modifier ':X'. Previously, this
expression errored out when the expression was evaluated at parse

make: error out on parse/evaluation errors in shell commands

The expression ${VAR:X} has an unknown modifier ':X'. Previously, this
expression errored out when the expression was evaluated at parse time,
but not when the expression was evaluated when generating the commands
to bring a target up to date. The errors were previously reported, they
didn't affect the exit status, though.

Now, errors in expressions are handled in the same way, regardless of
the time at which they are evaluated.

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make: only generate code for cleanup functions in CLEANUP mode

make: add more context information to error messages

In case of a parse error or evaluation error, print the variable value
in addition to the variable name, to see the effects of previous
expressio

make: add more context information to error messages

In case of a parse error or evaluation error, print the variable value
in addition to the variable name, to see the effects of previous
expression modifiers.

In nested make calls, print the current directory at the bottom of a
stack trace, as that information is otherwise hard to get in a parallel
build spanning multiple directories.

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make: in warnings, move the word "warning" to the front

make: sync VarEvalMode constant names with their debug log names

make: add .export-all

An explicit syntax for exporting all global variables is much safer
than allowing .export with no argument to do the same.

Add .export-all and have .export with no argument th

make: add .export-all

An explicit syntax for exporting all global variables is much safer
than allowing .export with no argument to do the same.

Add .export-all and have .export with no argument throw a warning saying
to use .export-all

Reviewed by: rillig

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make: clean up API for iterating over hash tables

make: use fewer technical terms in debug message for dependency

make: fix memory leak for command strings

make: fix some more memory leaks

make: fix a few more memory leaks

make: use separate function to include makefiles.

Have Dir_FindFile and Dir_FindInclude call FindFile with a
bool flag to indicate whether .CURDIR should be be searched at all.

make: simplify freeing of lists

make: clean up comments, code and tests

make: provide more context information for parse/evaluate errors

make: add debug logging for .if and .for lines in -dp mode

This helps track down in which line a condition is evaluated.

make: exit immediately after reading a null byte from a makefile

The chance of other garbage bytes in such a file is just too high.

make: remove unneeded conditional-compilation toggles

The toggles INCLUDES, LIBRARIES, POSIX, SYSVINCLUDE, SYSVVARSUB,
GMAKEEXPORT and SUNSHCMD are no longer needed, they were unconditionally
set.

make: remove unneeded conditional-compilation toggles

The toggles INCLUDES, LIBRARIES, POSIX, SYSVINCLUDE, SYSVVARSUB,
GMAKEEXPORT and SUNSHCMD are no longer needed, they were unconditionally
set.

The toggle NO_REGEX was configurable from the command line, but
disabling it would result in various error messages about the unknown
':C' modifier.

OK sjg@.

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make: clean up comments, constify shell name

make: miscellaneous cleanups

make: do not add newline to an empty buffer

When LoadFile reads from /dev/null the buffer will be empty,
appending "\n" just results in an unnecessary extra call
to ParseRawLine.

Reviewed by: rillig