Cleanup: use static local variables

source/blender/blenkernel/intern/icons.cc

@@ -86,7 +86,7 @@ static int gNextIconId = 1;
 /* Protected by gIconMutex. */
 static int gFirstIconId = 1;
 
-std::mutex gIconMutex;
+static std::mutex gIconMutex;
 
 /* Not mutex-protected! */
 static GHash *gCachedPreviews = nullptr;

source/blender/blenlib/intern/BLI_mmap.c

@@ -67,7 +67,7 @@ struct BLI_mmap_file {
  * handler if one was configured and abort the process otherwise.
  */
 
-struct error_handler_data {
+static struct error_handler_data {
   ListBase open_mmaps;
   char configured;
   void (*next_handler)(int, siginfo_t *, void *);

source/blender/blenlib/tests/BLI_string_utf8_test.cc

@@ -22,7 +22,7 @@
  * Based on utf-8 decoder stress-test (https://www.cl.cam.ac.uk/~mgk25/ucs/examples/UTF-8-test.txt)
  *     by Markus Kuhn <http://www.cl.cam.ac.uk/~mgk25/> - 2015-08-28 - CC BY 4.0
  */
-const char *utf8_invalid_tests[][3] = {
+static const char *utf8_invalid_tests[][3] = {
 /*    1  Some correct UTF-8 text. */
     {"You should see the Greek word 'kosme':       \"\xce\xba\xe1\xbd\xb9\xcf\x83\xce\xbc\xce\xb5\"                    |",
      "You should see the Greek word 'kosme':       \"\xce\xba\xe1\xbd\xb9\xcf\x83\xce\xbc\xce\xb5\"                    |", "\x00"},

source/blender/editors/animation/keyframes_general.c

@@ -44,6 +44,7 @@
 #include "BKE_report.h"
 
 #include "RNA_access.h"
+#include "RNA_enum_types.h"
 
 #include "ED_anim_api.h"
 #include "ED_keyframes_edit.h"

source/blender/functions/tests/FN_cpp_type_test.cc

@@ -79,7 +79,7 @@ MAKE_CPP_TYPE(TestType, blender::fn::tests::TestType)
 
 namespace blender::fn::tests {
 
-const CPPType &CPPType_TestType = CPPType::get<TestType>();
+static const CPPType &CPPType_TestType = CPPType::get<TestType>();
 
 TEST(cpp_type, Size)
 {

source/blender/modifiers/intern/MOD_boolean.c

@@ -77,9 +77,9 @@
 #endif
 
 #ifdef WITH_GMP
-const bool bypass_bmesh = true;
+static const bool bypass_bmesh = true;
 #else
-const bool bypass_bmesh = false;
+static const bool bypass_bmesh = false;
 #endif
 
 static void initData(ModifierData *md)
@@ -729,6 +729,7 @@ static Mesh *modifyMesh(ModifierData *md, const ModifierEvalContext *ctx, Mesh *
     return exact_boolean_mesh(bmd, ctx, mesh);
   }
 #else
+  UNUSED_VARS(bypass_bmesh);
   const bool use_exact = false;
 #endif