From cad06cdb2c3aeef869a839fb020ca0cecfe5029f Mon Sep 17 00:00:00 2001
From: Jason Volk <jason@zemos.net>
Date: Mon, 20 Jun 2022 20:02:21 -0700
Subject: [PATCH] configure: Add --with-gcc-toolchain for library version
 workarounds (clang-10).

---
 configure.ac | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/configure.ac b/configure.ac
index 3140d14c6..b2d1ec567 100644
--- a/configure.ac
+++ b/configure.ac
@@ -529,6 +529,27 @@ AC_ARG_ENABLE(lowmem-compile, RB_HELP_STRING([--enable-lowmem-compile], [Enable
 
 AM_CONDITIONAL([LOWMEM_COMPILE], [[[[ $lowmem_compile = "yes" ]]]])
 
+dnl
+dnl GCC toolchain selection (for clang)
+dnl
+
+AC_MSG_CHECKING(whether to use a specific GCC toolchain)
+AC_ARG_WITH(gcc-toolchain, RB_HELP_STRING([--with-gcc-toolchain], [Path to GCC toolchain]),
+[
+	with_gcc_toolchain=$withval
+	AC_MSG_RESULT([yes, "$with_gcc_toolchain"])
+	AC_SUBST(GCC_TOOLCHAIN, $with_gcc_toolchain)
+	AM_COND_IF(CLANG,
+	[
+		RB_VAR_PREPEND([CXXFLAGS], ["--gcc-toolchain=$with_gcc_toolchain"])
+		RB_VAR_PREPEND([LDFLAGS], ["--gcc-toolchain=$with_gcc_toolchain"])
+	], [
+		AC_MSG_WARN([--with-gcc-toolchain only applies to clang builds.])
+	])
+], [
+	AC_MSG_RESULT([no])
+])
+
 
 dnl ***************************************************************************
 dnl