In java.base/share/native/libjli/java.c GrowKnownVMs is declared as follows:

static void GrowKnownVMs();

however the actual signature of GrowKnownVMs is:

static void GrowKnownVMs(int minimum);

This leads to the following waring/error:

/usr/work/d046063/OpenJDK/jdk9-dev/jdk/src/java.base/share/native/libjli/java.c: In function ‘ReadKnownVMs’:
/usr/work/d046063/OpenJDK/jdk9-dev/jdk/src/java.base/share/native/libjli/java.c:1686:13: error: call to function ‘GrowKnownVMs’ without a real prototype [-Werror=unprototyped-calls]
             GrowKnownVMs(cnt);
/usr/work/d046063/OpenJDK/jdk9-dev/jdk/src/java.base/share/native/libjli/java.c:148:13: note: ‘GrowKnownVMs’ was declared here
 static void GrowKnownVMs();