In gcc -fdelete-null-pointer-checks is a nightmare.

It is a stupid optimisation which has some bad security track record since
it tends to remove 'if (p == NULL) error out' checks. Now on OpenBSD you can
not map the page at address 0 so it is less of a concern since in that
case the code should crash before the check (at least that is the theory).

The problem with skipping this optimisation is that a lot of c++ code
breaks because of static asserts against nullptr.
Many of those expressions are actually not using proper const expressions
and so gcc errors out. With -fdelete-null-pointer-checks these checks
get optimised away (because the compiler decided that somewhen before the
static assert the pointer was already dereferenced and so impossible to be
NULL).

I got tired to figure out how to pass -fdelete-null-pointer-checks to all
those c++ monsters. The common linux distros all ship with a gcc that has
-fdelete-null-pointer-checks set by default and so we just inflict a lot
of pain on us for being a special snowflake.

-- 
:wq Claudio

Index: Makefile
===================================================================
RCS file: /cvs/ports/lang/gcc/15/Makefile,v
diff -u -p -r1.13 Makefile
--- Makefile	13 Nov 2025 23:30:14 -0000	1.13
+++ Makefile	17 Nov 2025 12:57:04 -0000
@@ -18,7 +18,7 @@ V = 15.2.0
 FULL_VERSION = $V
 FULL_PKGVERSION = $V
 
-REVISION = 3
+REVISION = 4
 
 ADASTRAP-amd64 = adastrap-amd64-11.2.0-5.tar.xz
 ADASTRAP-arm = adastrap-arm-4.9.4-0.tar.xz
Index: patches/patch-gcc_common_opt
===================================================================
RCS file: /cvs/ports/lang/gcc/15/patches/patch-gcc_common_opt,v
diff -u -p -r1.1.1.1 patch-gcc_common_opt
--- patches/patch-gcc_common_opt	18 Aug 2025 19:49:22 -0000	1.1.1.1
+++ patches/patch-gcc_common_opt	12 Nov 2025 12:57:16 -0000
@@ -41,15 +41,6 @@ Index: gcc/common.opt
  Aggressively optimize loops using language constraints.
  
  falign-functions
-@@ -1359,7 +1367,7 @@ Common Var(flag_delete_dead_exceptions) Init(0) Optimi
- Delete dead instructions that may throw exceptions.
- 
- fdelete-null-pointer-checks
--Common Var(flag_delete_null_pointer_checks) Init(-1) Optimization
-+Common Var(flag_delete_null_pointer_checks) Init(0) Optimization
- Delete useless null pointer checks.
- 
- fdevirtualize-at-ltrans
 @@ -1943,7 +1951,7 @@ Enum(hardcfr_check_noreturn_calls) String(always) Valu
  ; On SVR4 targets, it also controls whether or not to emit a
  ; string identifying the compiler.