[Bug 14801] New: buildsys: "File name too long" errors when creating `.dep` files

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=14801

            Bug ID: 14801
           Summary: buildsys: "File name too long" errors when creating
                    `.dep` files
           Product: uClibc++
           Version: 0.2.5
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P5
         Component: Other
          Assignee: unassigned at uclibc.org
          Reporter: alois+busybox at aloisklink.com
                CC: uclibc-cvs at uclibc.org
  Target Milestone: ---

It looks like this error has already been fixed in the `master` branch:
https://git.uclibc.org/uClibc++/commit/?id=6687fc9276fa52defaf8592f2001c19b826aec93

Still, I thought I'd document it since it took me quite a while of debugging to
find the cause of this error (and maybe to gently nudge for a v0.2.6 release)

Building uClibc++ encodes the path to libsup and libgcc as a filename.
On most systems, the maximum filepath is longer than the maximum filename.

Linux defaults to 4096 for the max filepath length and 255 for the max filename
length.

Using cross-compiling SDKs can easily create a filepath over 255 chars, and
thus cause uClibc++ to fail to build due to maximum filepath errors.

This error has reached a few people using the OpenWRT SDK:
  -
https://forum.openwrt.org/t/buid-package-uclibc-failed-by-using-openwrt-sdk/64377
  - https://lists.openwrt.org/pipermail/openwrt-devel/2021-May/035321.html
  - https://github.com/trojan-gfw/trojan/issues/588

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