From 4dfbdb5451ec3041b206bc057b5c1a2eb2a6b774 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Andreas=20K=2E=20H=C3=BCttel?= <dilfridge@gentoo.org>
Date: Sat, 20 Jan 2018 18:35:27 +0100
Subject: [PATCH] sys-libs/glibc: Test for IA32 emulation before building amd64
 multilib glibc, bug 326693.

Based on the patch by Steven Presser.

Closes: https://bugs.gentoo.org/326693
Package-Manager: Portage-2.3.19, Repoman-2.3.6
---
 sys-libs/glibc/glibc-9999.ebuild | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/sys-libs/glibc/glibc-9999.ebuild b/sys-libs/glibc/glibc-9999.ebuild
index 522a3674fe0c..81dadb177948 100644
--- a/sys-libs/glibc/glibc-9999.ebuild
+++ b/sys-libs/glibc/glibc-9999.ebuild
@@ -701,6 +701,23 @@ pkg_pretend() {
 			fi
 		done
 	fi
+
+	# ABI-specific checks follow here. Hey, we have a lot more specific conditions that
+	# we test for...
+	if ! is_crosscompile ; then
+
+		if use amd64 && use multilib ; then
+			ebegin "Checking that IA32 emulation is enabled in the running kernel"
+			echo 'int main(){return 0;}' > "${T}/check-ia32-emulation.c"
+			"${CC-${CHOST}-gcc}" ${CFLAGS_x86} "${T}/check-ia32-emulation.c" -o "${T}/check-ia32-emulation.elf32"
+			"${T}/check-ia32-emulation.elf32"
+			local STAT=$?
+			rm -f "${T}/check-ia32-emulation.elf32"
+			eend $STAT
+			[ $STAT -eq 0 ] || die "CONFIG_IA32_EMULATION must be enabled in the kernel to compile a multilib glibc."
+		fi
+
+	fi
 }
 # todo: shouldn't most of these checks be called also in src_configure again?
 # (since consistency is not guaranteed between pkg_ and src_)
-- 
2.26.2