8021296: [TESTBUG] Test8017498.sh fails to find "gcc" and fails to compile on some Linux releases

Added checking for gcc and simplified the sig_handler() in the test case

Reviewed-by: dcubed, coleenp, minqi, dlong

hotspot/test/runtime/6929067/Test6929067.sh

@@ -3,6 +3,7 @@
 ##
 ## @test Test6929067.sh
 ## @bug 6929067
+## @bug 8021296
 ## @summary Stack guard pages should be removed when thread is detached
 ## @compile T.java
 ## @run shell Test6929067.sh
@@ -21,6 +22,11 @@ echo "TESTSRC=${TESTSRC}"
 OS=`uname -s`
 case "$OS" in
   Linux)
+    gcc_cmd=`which gcc`
+    if [ "x$gcc_cmd" == "x" ]; then
+        echo "WARNING: gcc not found. Cannot execute test." 2>&1
+        exit 0;
+    fi
     NULL=/dev/null
     PS=":"
     FS="/"
@@ -119,7 +125,7 @@ echo "VM type: ${VMTYPE}"
 # Check to ensure you have a /usr/lib/libpthread.so if you don't please look
 # for /usr/lib/`uname -m`-linux-gnu version ensure to add that path to below compilation.
 
-gcc -DLINUX ${COMP_FLAG} -o invoke \
+$gcc_cmd -DLINUX ${COMP_FLAG} -o invoke \
     -I${COMPILEJAVA}/include -I${COMPILEJAVA}/include/linux \
     -L${COMPILEJAVA}/jre/lib/${ARCH}/${VMTYPE} \
     -ljvm -lpthread invoke.c

hotspot/test/runtime/7107135/Test7107135.sh

@@ -27,6 +27,7 @@
 ##
 ## @test Test7107135.sh
 ## @bug 7107135
+## @bug 8021296
 ## @summary Stack guard pages lost after loading library with executable stack.
 ## @run shell Test7107135.sh
 ##
@@ -45,6 +46,11 @@ OS=`uname -s`
 case "$OS" in
   Linux)
     echo "Testing on Linux"
+    gcc_cmd=`which gcc`
+    if [ "x$gcc_cmd" == "x" ]; then
+        echo "WARNING: gcc not found. Cannot execute test." 2>&1
+        exit 0;
+    fi
     ;;
   *)
     NULL=NUL
@@ -62,7 +68,10 @@ THIS_DIR=.
 cp ${TESTSRC}${FS}*.java ${THIS_DIR}
 ${TESTJAVA}${FS}bin${FS}javac *.java
 
-gcc -fPIC -shared -c -o test.o -I${TESTJAVA}${FS}include -I${TESTJAVA}${FS}include${FS}linux ${TESTSRC}${FS}test.c
+$gcc_cmd -fPIC -shared -c -o test.o \
+    -I${TESTJAVA}${FS}include -I${TESTJAVA}${FS}include${FS}linux \
+    ${TESTSRC}${FS}test.c
+
 ld -shared -z   execstack -o libtest-rwx.so test.o
 ld -shared -z noexecstack -o libtest-rw.so  test.o
 

hotspot/test/runtime/jsig/Test8017498.sh

@@ -27,6 +27,7 @@
 ## @test Test8017498.sh
 ## @bug 8017498
 ## @bug 8020791
+## @bug 8021296
 ## @summary sigaction(sig) results in process hang/timed-out if sig is much greater than SIGRTMAX
 ## @run shell/timeout=30 Test8017498.sh
 ##
@@ -45,6 +46,11 @@ OS=`uname -s`
 case "$OS" in
   Linux)
     echo "Testing on Linux"
+    gcc_cmd=`which gcc`
+    if [ "x$gcc_cmd" == "x" ]; then
+        echo "WARNING: gcc not found. Cannot execute test." 2>&1
+        exit 0;
+    fi
     if [ "$VM_BITS" = "64" ]
     then
         MY_LD_PRELOAD=${TESTJAVA}${FS}jre${FS}lib${FS}amd64${FS}libjsig.so
@@ -64,15 +70,11 @@ THIS_DIR=.
 cp ${TESTSRC}${FS}*.java ${THIS_DIR}
 ${TESTJAVA}${FS}bin${FS}javac *.java
 
-gcc -DLINUX -fPIC -shared \
+$gcc_cmd -DLINUX -fPIC -shared \
     -o ${TESTSRC}${FS}libTestJNI.so \
     -I${TESTJAVA}${FS}include \
     -I${TESTJAVA}${FS}include${FS}linux \
     ${TESTSRC}${FS}TestJNI.c
-if [ $? != 0 ]
-then
-    echo "WARNING: the gcc command failed." 2>&1
-fi
 
 # run the java test in the background
 cmd="LD_PRELOAD=$MY_LD_PRELOAD \

hotspot/test/runtime/jsig/TestJNI.c

@@ -21,7 +21,6 @@
  * questions.
  */
 
-#define _GNU_SOURCE // for the definition of REG_RIP in ucontext.h
 #include <stdio.h>
 #include <jni.h>
 #include <signal.h>
@@ -32,11 +31,8 @@ extern "C" {
 #endif
 
 void sig_handler(int sig, siginfo_t *info, ucontext_t *context) {
-    int thrNum;
 
     printf( " HANDLER (1) " );
-    // Move forward RIP to skip failing instruction
-    context->uc_mcontext.gregs[REG_RIP] += 6;
 }
 
 JNIEXPORT void JNICALL Java_TestJNI_doSomething(JNIEnv *env, jclass klass, jint val) {