From b73f8cf68dc30d2274887454adbd6e54353c495e Mon Sep 17 00:00:00 2001
From: Andy Fiddaman <omnios@citrus-it.co.uk>
Date: Tue, 31 Aug 2021 21:40:48 +0000
Subject: libstdc++ must use thread-local errno

---
 libstdc++-v3/configure    | 6 ++++++
 libstdc++-v3/configure.ac | 5 +++++
 2 files changed, 11 insertions(+)

diff --git a/libstdc++-v3/configure b/libstdc++-v3/configure
index 326a279c54f..09377ed04b0 100755
--- a/libstdc++-v3/configure
+++ b/libstdc++-v3/configure
@@ -77492,6 +77492,12 @@
 tmake_file="${tmake_file_}"
 
 
+case "${target}" in *-*-solaris2*)
+	EXTRA_CFLAGS="$EXTRA_CFLAGS -D_TS_ERRNO"
+	EXTRA_CXX_FLAGS="$EXTRA_CXX_FLAGS -D_TS_ERRNO"
+esac
+
+
 # Add CET specific flags if Intel CET is enabled.
  # Check whether --enable-cet was given.
 if test "${enable_cet+set}" = set; then :
diff --git a/libstdc++-v3/configure.ac b/libstdc++-v3/configure.ac
index 3c799be82b1..37651e211d4 100644
--- a/libstdc++-v3/configure.ac
+++ b/libstdc++-v3/configure.ac
@@ -584,6 +584,11 @@
 tmake_file="${tmake_file_}"
 AC_SUBST(tmake_file)
 
+case "${target}" in *-*-solaris2*)
+	EXTRA_CFLAGS="$EXTRA_CFLAGS -D_TS_ERRNO"
+	EXTRA_CXX_FLAGS="$EXTRA_CXX_FLAGS -D_TS_ERRNO"
+esac
+
 # Add CET specific flags if Intel CET is enabled.
 GCC_CET_FLAGS(CET_FLAGS)
 EXTRA_CXX_FLAGS="$EXTRA_CXX_FLAGS $CET_FLAGS"