[llvm-branch-commits] [compiler-rt] release/19.x: Undef _TIME_BITS along with _FILE_OFFSET_BITS (PR #112247)

[Tobias Hieta via llvm-branch-commits]

https://github.com/tru updated https://github.com/llvm/llvm-project/pull/112247

>From d8752671e825ca5c967cc58a23778ae378c8dea2 Mon Sep 17 00:00:00 2001
From: Thomas Petazzoni <thomas.petazzoni at bootlin.com>
Date: Fri, 19 Jul 2024 22:22:55 +0200
Subject: [PATCH] Undef _TIME_BITS along with _FILE_OFFSET_BITS

This change is identical to
26800a2c7e7996dc773b4e990dd5cca41c45e1a9 ("[sanitizer] Undef
_TIME_BITS along with _FILE_OFFSET_BITS on Linux"), but for
sanitizer_procmaps_solaris.cpp.

Indeed, even though sanitizer_procmaps_solaris.cpp is Solaris
specific, it also gets built on Linux platforms. It also includes
sanitizer_platform.h, which also ends up including features-time64.h,
causing a build failure on 32-bit Linux platforms on which 64-bit
time_t is enabled by setting _TIME_BITS=64.

To fix this, we do the same change: undefine _TIME_BITS, which anyway
will cause no harm as the rest of this file is inside a
SANITIZER_SOLARIS compile-time conditional.

Fixes:

In file included from /home/thomas/buildroot/buildroot/output/host/i686-buildroot-linux-gnu/sysroot/usr/include/features.h:394,
                 from ../../../../libsanitizer/sanitizer_common/sanitizer_platform.h:25,
                 from ../../../../libsanitizer/sanitizer_common/sanitizer_procmaps_solaris.cpp:14:
/home/thomas/buildroot/buildroot/output/host/i686-buildroot-linux-gnu/sysroot/usr/include/features-time64.h:26:5: error: #error "_TIME_BITS=64 is al
lowed only with _FILE_OFFSET_BITS=64"
   26 | #   error "_TIME_BITS=64 is allowed only with _FILE_OFFSET_BITS=64"
      |     ^~~~~

Signed-off-by: Thomas Petazzoni <thomas.petazzoni at bootlin.com>
Closes: https://github.com/llvm/llvm-project/pull/99699
(cherry picked from commit a1217020da219386b29c1a5a4a217904ecf07d7d)
---
 .../lib/sanitizer_common/sanitizer_procmaps_solaris.cpp       | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_procmaps_solaris.cpp b/compiler-rt/lib/sanitizer_common/sanitizer_procmaps_solaris.cpp
index eeb49e2afe34d4..80b8158f43db9e 100644
--- a/compiler-rt/lib/sanitizer_common/sanitizer_procmaps_solaris.cpp
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_procmaps_solaris.cpp
@@ -11,6 +11,10 @@
 
 // Before Solaris 11.4, <procfs.h> doesn't work in a largefile environment.
 #undef _FILE_OFFSET_BITS
+
+// Avoid conflict between `_TIME_BITS` defined vs. `_FILE_OFFSET_BITS`
+// undefined in some Linux configurations.
+#undef _TIME_BITS
 #include "sanitizer_platform.h"
 #if SANITIZER_SOLARIS
 #  include <fcntl.h>