From e7e8b6cc33dababfefad8f12cd37c173bba7841b Mon Sep 17 00:00:00 2001
From: ghpzin <ghpzin@gmail.com>
Date: Mon, 24 Nov 2025 08:47:47 +0300
Subject: [PATCH] ecl: fix build with gcc15

- add "CFLAGS=-std=gnu17" to `configureFlags`.

There are patches upstream to make it build with `-std=gnu23`
(default in gcc15):
https://gitlab.com/embeddable-common-lisp/ecl/-/merge_requests/325
https://gitlab.com/embeddable-common-lisp/ecl/-/merge_requests/345
but applying them makes it not build with `-std=gnu17` (default in gcc14)
instead.

Fixes build failure with gcc15:
```
/build/ecl-24.5.10/src/c/dpp.c:112:13: error: 'bool' cannot be defined
via 'typedef'
  112 | typedef int bool;
      |             ^~~~
/build/ecl-24.5.10/src/c/dpp.c:112:13: note: 'bool' is a keyword
with '-std=c23' onwards
/build/ecl-24.5.10/src/c/dpp.c:112:1: warning: useless type name in
empty declaration
  112 | typedef int bool;
      | ^~~~~~~
```
---
 pkgs/development/compilers/ecl/default.nix | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/pkgs/development/compilers/ecl/default.nix b/pkgs/development/compilers/ecl/default.nix
index c937ad95afa4..644ce3cc6be6 100644
--- a/pkgs/development/compilers/ecl/default.nix
+++ b/pkgs/development/compilers/ecl/default.nix
@@ -59,6 +59,8 @@ stdenv.mkDerivation rec {
   ];
 
   configureFlags = [
+    # Fix build with gcc15
+    "CFLAGS=-std=gnu17"
     (if threadSupport then "--enable-threads" else "--disable-threads")
     "--with-gmp-incdir=${lib.getDev gmp}/include"
     "--with-gmp-libdir=${lib.getLib gmp}/lib"