unifdef: Don't use C23 constexpr keyword

Fixes build with GCC-15

(From OE-Core rev: 6aa6b4d59cbbc385edd96fa489b27c1a1848566a)

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 59 insertions, 1 deletions

diff --git a/meta/recipes-devtools/unifdef/unifdef/0001-Don-t-use-C23-constexpr-keyword.patch b/meta/recipes-devtools/unifdef/unifdef/0001-Don-t-use-C23-constexpr-keyword.patch
new file mode 100644
index 0000000000..9d02183930
--- /dev/null
+++ b/meta/recipes-devtools/unifdef/unifdef/0001-Don-t-use-C23-constexpr-keyword.patch
@@ -0,0 +1,57 @@
+From ca1ac9c8bde84dbdea972299b1a6e30e78c2d785 Mon Sep 17 00:00:00 2001
+From: Sam James <sam@gentoo.org>
+Date: Sun, 17 Nov 2024 01:26:27 +0000
+Subject: [PATCH] Don't use C23 constexpr keyword
+
+This fixes building with upcoming GCC 15 which defaults to -std=gnu23.
+
+Upstream-Status: Submitted [https://github.com/fanf2/unifdef/pull/19]
+Signed-off-by: Khem Raj <raj.khem@gmail.com>
+---
+ unifdef.c | 10 +++++-----
+ 1 file changed, 5 insertions(+), 5 deletions(-)
+
+diff --git a/unifdef.c b/unifdef.c
+index dc145a2..4bd3bda 100644
+--- a/unifdef.c
++++ b/unifdef.c
+@@ -202,7 +202,7 @@ static int              depth;                      /* current #if nesting */
+ static int              delcount;              /* count of deleted lines */
+ static unsigned         blankcount;            /* count of blank lines */
+ static unsigned         blankmax;              /* maximum recent blankcount */
+-static bool             constexpr;             /* constant #if expression */
++static bool             is_constexpr;          /* constant #if expression */
+ static bool             zerosyms;              /* to format symdepth output */
+ static bool             firstsym;              /* ditto */
+ 
+@@ -1086,7 +1086,7 @@ eval_unary(const struct ops *ops, long *valp, const char **cpp)
+                        *valp = (value[sym] != NULL);
+                        lt = *valp ? LT_TRUE : LT_FALSE;
+                }
+-               constexpr = false;
++               is_constexpr = false;
+        } else if (!endsym(*cp)) {
+                debug("eval%d symbol", prec(ops));
+                sym = findsym(&cp);
+@@ -1103,7 +1103,7 @@ eval_unary(const struct ops *ops, long *valp, const char **cpp)
+                        lt = *valp ? LT_TRUE : LT_FALSE;
+                        cp = skipargs(cp);
+                }
+-               constexpr = false;
++               is_constexpr = false;
+        } else {
+                debug("eval%d bad expr", prec(ops));
+                return (LT_ERROR);
+@@ -1170,10 +1170,10 @@ ifeval(const char **cpp)
+        long val = 0;
+ 
+        debug("eval %s", *cpp);
+-       constexpr = killconsts ? false : true;
++       is_constexpr = killconsts ? false : true;
+        ret = eval_table(eval_ops, &val, cpp);
+        debug("eval = %d", val);
+-       return (constexpr ? LT_IF : ret == LT_ERROR ? LT_IF : ret);
++       return (is_constexpr ? LT_IF : ret == LT_ERROR ? LT_IF : ret);
+ }
+ 
+ /*
diff --git a/meta/recipes-devtools/unifdef/unifdef_2.12.bb b/meta/recipes-devtools/unifdef/unifdef_2.12.bb
index 3e08b3a0a4..bf0f3e1b17 100644
--- a/meta/recipes-devtools/unifdef/unifdef_2.12.bb
+++ b/meta/recipes-devtools/unifdef/unifdef_2.12.bb
@@ -8,7 +8,8 @@ LIC_FILES_CHKSUM = "file://COPYING;md5=3498caf346f6b77934882101749ada23 \
                     file://unifdef.c;endline=32;md5=6f4ee8085d6e6ab0f7cb4390e1a9c497 \
                     "
 
-SRC_URI = "http://dotat.at/prog/${BPN}/${BP}.tar.xz"
+SRC_URI = "http://dotat.at/prog/${BPN}/${BP}.tar.xz \
+           file://0001-Don-t-use-C23-constexpr-keyword.patch"
 SRC_URI[md5sum] = "ae8c0b3b4c43c1f6bc5f32412a820818"
 SRC_URI[sha256sum] = "43ce0f02ecdcdc723b2475575563ddb192e988c886d368260bc0a63aee3ac400"