@@ -, +, @@ 
 level of -Os
---
 eclass/mozcoreconf-v5.eclass | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)
--- a/eclass/mozcoreconf-v5.eclass	
+++ a/eclass/mozcoreconf-v5.eclass	
@@ -178,8 +178,12 @@ mozconfig_init() {
 			mozconfig_annotate "Gentoo's default optimization" --enable-optimize=-O2
 		fi
 	else
-		# Enable Mozilla's default
-		mozconfig_annotate "mozilla default" --enable-optimize
+		if [[ $(gcc-major-version) -ge 7 ]]; then
+			mozconfig_annotate "Work around broken gcc-7" --enable-optimize=-O2
+		else
+			# Enable Mozilla's default
+			mozconfig_annotate "mozilla default" --enable-optimize
+		fi
 	fi
 
 	# Strip optimization so it does not end up in compile string
--