Handle GCC 7 std::string operator ABI break

We now require gcc 7 on the packaging side, and add an appropriate
symbol to our symbols file.

Also adjust prepare-release to ignore g++ version requirements
when setting up build dependencies on CI.

Closes: #871275

1 files changed, 1 insertions, 0 deletions

diff --git a/prepare-release b/prepare-release
index 8c4e0978b..d7eb14705 100755
--- a/prepare-release
+++ b/prepare-release
@@ -41,6 +41,7 @@ test_deb_control() {
 	           -e 's#@[^,<>()@]*@##g' \
 	           -e 's#dpkg-dev \([^)]*\)#dpkg-dev#g' \
 	           -e 's#debhelper \([^)]*\)#debhelper#g' \
+	           -e 's#g\+\+ \([^)]*\)#g++#g' \
 	           -e 's#@##g' \
 	           -e 's#,(\s+,)+#, #g' \
 	           -e 's#\s+# #g'