[llvm] Revert f9146ccbe940d8b8eb15e7686a511a28eb0abc6b (PR #131656)

[Alexey Samsonov via llvm-commits]

https://github.com/vonosmas created https://github.com/llvm/llvm-project/pull/131656

This reverts commit f9146ccbe940d8b8eb15e7686a511a28eb0abc6b ([libc][bazel] explicitly use system-provided errno in Bazel builds. (#130663))

This change causes problems in Bazel builds where system errno is set to non-zero before the tests even begin to run - see PR #131650 for the disucssion on how to address this.

>From e5c9f6e8eb9d08326180ff1fd4895411dafaa2a7 Mon Sep 17 00:00:00 2001
From: Alexey Samsonov <vonosmas at gmail.com>
Date: Mon, 17 Mar 2025 11:28:16 -0700
Subject: [PATCH] Revert "[libc][bazel] explicitly use system-provided errno in
 Bazel builds. (#130663)"

This reverts commit f9146ccbe940d8b8eb15e7686a511a28eb0abc6b.

This change causes problems in Bazel builds where system errno is set to
non-zero before the tests even begin to run - see PR #131650 for the
disucssion on how to address this.
---
 .../llvm-project-overlay/libc/libc_configure_options.bzl     | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/utils/bazel/llvm-project-overlay/libc/libc_configure_options.bzl b/utils/bazel/llvm-project-overlay/libc/libc_configure_options.bzl
index 672ce8c0723ec..f65da9e98226b 100644
--- a/utils/bazel/llvm-project-overlay/libc/libc_configure_options.bzl
+++ b/utils/bazel/llvm-project-overlay/libc/libc_configure_options.bzl
@@ -44,11 +44,6 @@ LIBC_CONFIGURE_OPTIONS = [
     # "LIBC_COPT_STRTOFLOAT_DISABLE_EISEL_LEMIRE",
     # "LIBC_COPT_STRTOFLOAT_DISABLE_SIMPLE_DECIMAL_CONVERSION",
 
-    # Documentation in libc/src/errno/...
-    # Since we're only using Bazel for overlay build for now, explicitly
-    # enforce using the system-provided errno in both tests and release build.
-    "LIBC_ERRNO_MODE=LIBC_ERRNO_MODE_SYSTEM",
-
     # Documentation in libc/src/__support/libc_assert.h
     # "LIBC_COPT_USE_C_ASSERT",
 ]