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* [Buildroot] [PATCH] package/erlang: fix build with BR2_TIME_BITS_64
@ 2026-10-01 14:18 Yegor Yefremov via buildroot
  2026-10-02 19:50 ` Thomas Petazzoni via buildroot
  2026-10-10  9:23 ` Thomas Perale via buildroot
  0 siblings, 2 replies; 3+ messages in thread
From: Yegor Yefremov via buildroot @ 2026-10-01 14:18 UTC (permalink / raw)
  To: buildroot; +Cc: Will Newton

From: Yegor Yefremov <yegorslists@googlemail.com>

erts/emulator/sys/unix/sys_time.c undefines _FILE_OFFSET_BITS before
including system headers. With BR2_TIME_BITS_64=y, Buildroot passes
-D_TIME_BITS=64, which glibc only accepts together with
_FILE_OFFSET_BITS=64, so the build fails with:

  error: #error "_TIME_BITS=64 is allowed only with _FILE_OFFSET_BITS=64"

Backport the upstream commit that removes this ancient workaround.

Fixes:
https://autobuild.buildroot.org/results/72443d8e794451cbc4063e906d6b2405021cb52f

Assisted-by: Claude:claude-opus-5-5
Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>
---
 .../erlang/0002-otp-Fix-build-on-Yocto.patch  | 80 +++++++++++++++++++
 1 file changed, 80 insertions(+)
 create mode 100644 package/erlang/0002-otp-Fix-build-on-Yocto.patch

diff --git a/package/erlang/0002-otp-Fix-build-on-Yocto.patch b/package/erlang/0002-otp-Fix-build-on-Yocto.patch
new file mode 100644
index 0000000000..9f4de3508e
--- /dev/null
+++ b/package/erlang/0002-otp-Fix-build-on-Yocto.patch
@@ -0,0 +1,80 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?John=20H=C3=B6gberg?= <john@erlang.org>
+Date: Wed, 13 Dec 2023 16:34:04 +0100
+Subject: [PATCH] otp: Fix build on Yocto
+
+A workaround to avoid breaking "micro level process accounting on
+/proc/self" broke the build on Yocto. As this is a really ancient
+workaround (pre-2009) and the comment is unclear about what
+actually breaks, we'll try removing it to see if this is still a
+problem.
+
+Upstream: https://github.com/erlang/otp/commit/c38fc7c62e818273870340f3faf83cc3905e1cf1
+Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>
+---
+ erts/configure                    |  9 ---------
+ erts/emulator/sys/unix/sys_time.c | 10 ----------
+ make/autoconf/otp.m4              |  9 ---------
+ 3 files changed, 28 deletions(-)
+
+diff --git a/erts/configure b/erts/configure
+index 1d573b4..0b046dd 100755
+--- a/erts/configure
++++ b/erts/configure
+@@ -24417,15 +24417,6 @@ else $as_nop
+ /* end confdefs.h.  */
+ 
+ /* gethrvtime procfs ioctl test */
+-/* These need to be undef:ed to not break activation of
+- * micro level process accounting on /proc/self
+- */
+-#ifdef _LARGEFILE_SOURCE
+-#  undef _LARGEFILE_SOURCE
+-#endif
+-#ifdef _FILE_OFFSET_BITS
+-#  undef _FILE_OFFSET_BITS
+-#endif
+ #include <stdlib.h>
+ #include <unistd.h>
+ #include <string.h>
+diff --git a/erts/emulator/sys/unix/sys_time.c b/erts/emulator/sys/unix/sys_time.c
+index eb2c47b..f60e345 100644
+--- a/erts/emulator/sys/unix/sys_time.c
++++ b/erts/emulator/sys/unix/sys_time.c
+@@ -22,16 +22,6 @@
+ #  include "config.h"
+ #endif
+ 
+-/* These need to be undef:ed to not break activation of
+- * micro level process accounting on /proc/self 
+- */
+-#ifdef _LARGEFILE_SOURCE
+-#  undef _LARGEFILE_SOURCE
+-#endif
+-#ifdef _FILE_OFFSET_BITS
+-#  undef _FILE_OFFSET_BITS
+-#endif
+-
+ #include <stdlib.h>
+ #include "sys.h"
+ #include "global.h"
+diff --git a/make/autoconf/otp.m4 b/make/autoconf/otp.m4
+index f543101..984ee1a 100644
+--- a/make/autoconf/otp.m4
++++ b/make/autoconf/otp.m4
+@@ -2705,15 +2705,6 @@ dnl
+ AC_MSG_CHECKING([if gethrvtime works and how to use it])
+ AC_RUN_IFELSE([AC_LANG_SOURCE([[
+ /* gethrvtime procfs ioctl test */
+-/* These need to be undef:ed to not break activation of
+- * micro level process accounting on /proc/self 
+- */
+-#ifdef _LARGEFILE_SOURCE
+-#  undef _LARGEFILE_SOURCE
+-#endif
+-#ifdef _FILE_OFFSET_BITS
+-#  undef _FILE_OFFSET_BITS
+-#endif
+ #include <stdlib.h>
+ #include <unistd.h>
+ #include <string.h>
-- 
2.34.1

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2026-10-01 14:18 [Buildroot] [PATCH] package/erlang: fix build with BR2_TIME_BITS_64 Yegor Yefremov via buildroot
2026-10-02 19:50 ` Thomas Petazzoni via buildroot
2026-10-10  9:23 ` Thomas Perale via buildroot

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