#include macro ignored as a dependency

[bdbaddog]

This issue was originally created at: 2017-03-06 00:28:29.
This issue was reported by: stephendhill.
stephendhill said at 2017-03-06 00:28:29

#include macro, appears to be ignored as a dependency. E.g.

#define TESTPOINT_STEERING_FILE "sys_testpoint_all_sets.h"
#include TESTPOINT_STEERING_FILE

if sys_testpoint_all_sets.h is modified and we perform a build, nothing is rebuilt.

bdbaddog said at 2017-03-06 15:21:11

This is a known issue.

Please bring your issues to the users mailing list prior to filing a bug per the bug policy.

http://scons.org/bugs.html

There is a new scanner for c/C++ files in the work which may work for this use case.

You might try using the code in this pull request and see if it resolves your
issue. Please bring discussion of this to the users mailing list.

[mwichmann]

See also #344 - these look like dupes.

[mwichmann]

The CConditionalScanner does work for this case. It does not, at the moment at least, work for the case where the macro is defined on the command line (that is, comes from CPPDEFINES) - that case is also mentioned in the related issue #344. In order to close this issue out, do we need to document how to select the conditional scanner?