GCC-Plugin reproducer

basic_plugin.c

#include "bversion.h"
#if BUILDING_GCC_VERSION >= 6000
#include "gcc-plugin.h"
#else
#include "plugin.h"
#endif

#define __visible __attribute__((visibility("default")))

__visible int plugin_is_GPL_compatible;

static struct plugin_info basic_plugin_info = {
	.version = "201703181846",
	.help    = "Very basic plugin that does nothing",
};

__visible int plugin_init(struct plugin_name_args *plugin_info, struct plugin_gcc_version *version)
{
	const char * const plugin_name = plugin_info->base_name;

	register_callback(plugin_name, PLUGIN_INFO, NULL, &basic_plugin_info);

	return 0;
}

empty.c

int main(void)
{
	return 0;
}

gcc-debug-reproducer.patch

--- a/plugin.c
+++ b/plugin.c
@@ -143,6 +143,25 @@
   return base_name;
 }

+void dump_test_plugin_adresses(const char * context)
+{
+  int i;
+  fprintf(stderr, "Testing known plugins %s\n", context);
+  for (i = 1; i < 12; ++i) {
+    char * name;
+    if (asprintf(&name, "basic_plugin_%i", i) < 0) {
+      fprintf(stderr, "  %i: memory failure!\n", i);
+      break;
+    }
+    char *** slot = (char***) htab_find_slot (plugin_name_args_tab, name, NO_INSERT);
+    if (slot == NULL)
+        fprintf(stderr, "  %i(%s): %p\n", i, name, slot);
+    else
+        fprintf(stderr, "  %i(%s): %p (%s)\n", i, name, slot, **slot);
+    free(name);
+  }
+}
+

 /* Create a plugin_name_args object for the given plugin and insert it
    to the hash table. This function is called when

@@ -187,7 +202,8 @@
   if (!plugin_name_args_tab)
     plugin_name_args_tab = htab_create (10, htab_hash_string, htab_str_eq,
                                         NULL);
-
+  dump_test_plugin_adresses("Before insertion");
+  fprintf(stderr, "Inserting %s\n", base_name);
   slot = htab_find_slot (plugin_name_args_tab, base_name, INSERT);

   /* If the same plugin (name) has been specified earlier, either emit an
@@ -207,6 +223,7 @@
   plugin->full_name = plugin_name;

   *slot = plugin;
+  dump_test_plugin_adresses("After insertion");
 }

Makefile

HOST_GCC:=g++
TARGET_GCC:=gcc
GCCPLUGINS_DIR:= $(shell $(TARGET_GCC) -print-file-name=plugin)
CXXFLAGS+= -I$(GCCPLUGINS_DIR)/include -fPIC -fno-rtti -O2 -std=gnu++98 -fvisibility=hidden
PLUGIN_NUMBER:= 11

NUMBERS = $(shell seq 1 $(PLUGIN_NUMBER))
PLUGINS = $(addsuffix .so, $(addprefix basic_plugin_, $(NUMBERS)))
LOAD_PLUGINS = $(addprefix -fplugin=./,$(PLUGINS))

test: $(PLUGINS)
	$(TARGET_GCC) $(LOAD_PLUGINS) -fplugin-arg-basic_plugin_1-enable empty.c -o empty

basic_plugin.so: basic_plugin.c
	$(HOST_GCC) -shared $(CXXFLAGS) $^ -o $@

basic_plugin_%.so: basic_plugin.so
	cp $< $@

clean:
	-rm basic_plugin*.so
	-rm empty