8375311: Some builds are missing debug helpers

MBaesken · MBaesken · commit b7346c307fc1 · 2026-01-16T08:03:55.000Z
Reviewed-by: mdoerr, aph
diff --git a/src/hotspot/share/utilities/debug.cpp b/src/hotspot/share/utilities/debug.cpp
@@ -70,8 +70,10 @@
 #include <stdarg.h>
 #include <stdio.h>
 
-// These functions needs to be exported on Windows only
-#define DEBUGEXPORT WINDOWS_ONLY(JNIEXPORT)
+// These functions needs to be exported on Windows
+// On Linux it is also beneficial to export them to avoid
+// losing them e.g. with linktime gc
+#define DEBUGEXPORT JNIEXPORT
 
 // Support for showing register content on asserts/guarantees.
 #ifdef CAN_SHOW_REGISTERS_ON_ASSERT
@@ -653,13 +655,12 @@ extern "C" DEBUGEXPORT intptr_t u5p(intptr_t addr,
 void pp(intptr_t p)          { pp((void*)p); }
 void pp(oop p)               { pp((void*)p); }
 
-void help() {
+extern "C" DEBUGEXPORT void help() {
   Command c("help");
   tty->print_cr("basic");
   tty->print_cr("  pp(void* p)         - try to make sense of p");
   tty->print_cr("  ps()                - print current thread stack");
   tty->print_cr("  pss()               - print all thread stacks");
-  tty->print_cr("  pm(int pc)          - print Method* given compiled PC");
   tty->print_cr("  findnm(intptr_t pc) - find nmethod*");
   tty->print_cr("  findm(intptr_t pc)  - find Method*");
   tty->print_cr("  find(intptr_t x)    - find & print nmethod/stub/bytecode/oop based on pointer into it");
