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btrfs-progs: build: note about 32bit build on 64bit host

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Notes for making it work:

- "CFLAGS=-m32 LDFLAGS=-m32 ./configure ..." passes the right flags
  everywhere, otherwise just passing it by EXTRA_CFLAGS/EXTRA_LDFLAGS
  might miss some binaries or libraries

- note that passing CFLAGS/LDFLAGS to configure will override the
  default flags

- libbtrfsutil and python bindings require to pass the -m32 flags via
  EXTRA_PYTHON_CFLAGS/EXTRA_PYTHON_LDFLAGS

- all the e2fsprogs, zlib, lzo, util-linux etc need packaging changes to
  provide static libraries - usually frowned upon by distribution unless
  justified, even less so for static + 32bit versions, very niche
  use case

Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2021-03-10 21:35:51 +01:00
parent f537bf6bd7
commit eb84891443
1 changed files with 9 additions and 0 deletions
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INSTALL
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@ -108,5 +108,14 @@ The list of built-ins can be obtained by
The basic set will always contain: mkfs.btrfs, btrfs-image, btrfs-convert.
32bit build on 64bit host
-------------------------
The combination of 32bit build on 64bit host could work but depends on the
libraries that must provide the 32bit versions, or even 32bit static versions.
This is fairly uncommon on contemporary distributions and building 32bit
versions on a 32bit host is recommended.
References:
* https://btrfs.wiki.kernel.org