Due to c++17 eval order in gcc 7 we need to be more careful.

From gcc 7 release notes.
"The C++17 evaluation order requirements can be selected in other modes with the -fstrong-eval-order flag, or disabled in C++17 mode with -fno-strong-eval-order."

1 files changed, 2 insertions, 1 deletions

diff --git a/vespalib/src/tests/stllike/asciistream_test.cpp b/vespalib/src/tests/stllike/asciistream_test.cpp
index 63066a1bf14..958eb80392a 100644
--- a/vespalib/src/tests/stllike/asciistream_test.cpp
+++ b/vespalib/src/tests/stllike/asciistream_test.cpp
@@ -103,7 +103,8 @@ AsciistreamTest::testIllegalNumbers()
         float f(0);
         EXPECT_EXCEPTION(is >> f, IllegalArgumentException, "float value is outside of range '7777777777777777777777777777777777777777'");
         EXPECT_EQUAL(40u, is.size());
-        is << "e" << is.str();
+        vespalib::string tmp = is.str();
+        is << "e" << tmp;
         EXPECT_EQUAL(81u, is.size());
         double d(0);
         EXPECT_EXCEPTION(is >> d, IllegalArgumentException, "double value is outside of range '7777777777777777777777777777777777777777e7777777777777777777777777777777777777777'");