[klibc] [klibc:master] README.klibc: Document the KBUILD_REPRODUCIBLE variable

[klibc-bot for Ben Hutchings]

Commit-ID:  5def595a55493832f23c7d18a50937e93c61c80e
Gitweb:     http://git.kernel.org/?p=libs/klibc/klibc.git;a=commit;h=5def595a55493832f23c7d18a50937e93c61c80e
Author:     Ben Hutchings <ben at decadent.org.uk>
AuthorDate: Sat, 28 Mar 2020 22:31:19 +0000
Committer:  Ben Hutchings <ben at decadent.org.uk>
CommitDate: Sat, 28 Mar 2020 22:33:28 +0000

[klibc] README.klibc: Document the KBUILD_REPRODUCIBLE variable

Signed-off-by: Ben Hutchings <ben at decadent.org.uk>

---
 usr/klibc/README.klibc | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/usr/klibc/README.klibc b/usr/klibc/README.klibc
index 2b97f294..dfb0895c 100644
--- a/usr/klibc/README.klibc
+++ b/usr/klibc/README.klibc
@@ -92,6 +92,13 @@ don't need the kernel source as well.  You can either:
 2. Set the KLIBCKERNELSRC variable on the "make" command line to
    point to the *parent* of the UAPI headers directory.
 
+Reproducible builds
+-------------------
+
+Static libraries usually contain file timestamps, which are not
+reproducible.  Set KBUILD_REPRODUCIBLE=1 on the "make" command line to
+disable this.
+
 Architecture support
 ====================