From 988fd0eec5d88bf6534fb1f645777350c20d4723 Mon Sep 17 00:00:00 2001 From: Boris Kolpackov Date: Sat, 30 Jul 2016 11:41:48 +0200 Subject: Actualize project root directories This solves the problem of changing path spelling on platforms with case- insensitive filesystems. For example, you may build a project in the current working directory without specifying any paths. This means the current working directory will be used as the project's root. On Windows this could be C:\x. Now you are building another project that imports the above project and you specify config.import.x variable pointing to the above build. But you are lazy to type capital C so you spell it as config.import.x=c:\x. What happens now is the value from config.import.x is used as the project root. And now it is a different spelling compared to your original build. This is not a problem when the build system itself is concerned -- it is smart enough to use case-insensitive comparison. However, we often use roots to derive other things, say, -I options that we pass to compilers. And these options are normally no longer treated as (case-insensitive) paths. If they are hashed and the result stored in depdb, then we end up with rebuilds that are triggered by changes from C:\ to c:\. --- build2/types | 2 ++ 1 file changed, 2 insertions(+) (limited to 'build2/types') diff --git a/build2/types b/build2/types index 5409c60..8ccbd13 100644 --- a/build2/types +++ b/build2/types @@ -91,6 +91,8 @@ namespace build2 // a (variable) value of this type gets initialized from untyped names. See // value_type for details. // + // Note that currently we also normalize and actualize the path. + // struct abs_dir_path: dir_path { using dir_path::dir_path; -- cgit v1.1