--- old/make/test/JtregNativeJdk.gmk	2019-02-11 19:00:38.600236738 +0100
+++ new/make/test/JtregNativeJdk.gmk	2019-02-11 19:00:38.262236714 +0100
@@ -82,6 +82,14 @@
   BUILD_JDK_JTREG_EXCLUDE += exeJniInvocationTest.c
 endif
 
+ifeq ($(OPENJDK_TARGET_OS),linux)
+  # Unconditionally compile with debug symbols and don't ever perform
+  # stripping during the test libraries' build.
+  BUILD_JDK_JTREG_LIBRARIES_CFLAGS_libFib := -g
+  BUILD_JDK_JTREG_LIBRARIES_STRIP_SYMBOLS_libFib := false
+endif
+
+
 $(eval $(call SetupTestFilesCompilation, BUILD_JDK_JTREG_LIBRARIES, \
     TYPE := LIBRARY, \
     SOURCE_DIRS := $(BUILD_JDK_JTREG_NATIVE_SRC), \