coreboot/default and fam15h: gmp fix, gcc15 hostcc

gcc 15 defaults to -std=c23, but the older gcc was
using -std=c17. The new c23 breaks GMP, so let's add
a patch from upstream (GMP project) to fix it.

this has been done to both coreboot trees.

Signed-off-by: Leah Rowe <leah@libreboot.org>

1 files changed, 71 insertions, 0 deletions

diff --git a/config/coreboot/default/patches/0041-crossgcc-gmp-Add-upstream-fix-for-GCC-15.patch b/config/coreboot/default/patches/0041-crossgcc-gmp-Add-upstream-fix-for-GCC-15.patch
new file mode 100644
index 00000000..1d0b6072
--- /dev/null
+++ b/config/coreboot/default/patches/0041-crossgcc-gmp-Add-upstream-fix-for-GCC-15.patch
@@ -0,0 +1,71 @@
+From ee3925486f3567b9fe45cb98a88b9acc64991127 Mon Sep 17 00:00:00 2001
+From: Leah Rowe <leah@libreboot.org>
+Date: Tue, 29 Apr 2025 21:15:22 +0100
+Subject: [PATCH 1/1] crossgcc/gmp: Add upstream fix for GCC 15
+
+See:
+https://gmplib.org/list-archives/gmp-devel/2025-January/006279.html
+
+by default, upstream GCC-15 now defaults to -std=c23, instead
+of -std=c17, which can cause some build issues.
+
+GMP has this patch on their mailing list for GCC-15 (see link).
+
+Signed-off-by: Leah Rowe <leah@libreboot.org>
+---
+ .../gmp-6.3.0_acinclude-m4-fix-std-c23.patch  | 43 +++++++++++++++++++
+ 1 file changed, 43 insertions(+)
+ create mode 100644 util/crossgcc/patches/gmp-6.3.0_acinclude-m4-fix-std-c23.patch
+
+diff --git a/util/crossgcc/patches/gmp-6.3.0_acinclude-m4-fix-std-c23.patch b/util/crossgcc/patches/gmp-6.3.0_acinclude-m4-fix-std-c23.patch
+new file mode 100644
+index 0000000000..b884b62df7
+--- /dev/null
++++ b/util/crossgcc/patches/gmp-6.3.0_acinclude-m4-fix-std-c23.patch
+@@ -0,0 +1,43 @@
++From b1b61bc8ab19659f0fb8c0f87edcd79ae1bfef7e Mon Sep 17 00:00:00 2001
++From: Rudi Heitbaum <rudi@heitbaum.com>
++Date: Wed, 22 Jan 2025 02:34:09 +0100
++Subject: [PATCH 1/1] acinclude.m4: fix -std=c23 build failure
++
++Add prototype to configure test function as c23 removes unprototyped
++functions.
++
++gcc-15 switched to -std=c23 by default:
++
++    https://gcc.gnu.org/git/?p=gcc.git;a=commitdiff;h=55e3bd376b2214e200fa76d12b67ff259b06c212
++
++As a result `configure` fails with:
++    conftest.c: In function 'f':
++    conftest.c:12:48: error: too many arguments to function 'g'; expected 0, have 6
++       12 | for(i=0;i<1;i++){if(e(got,got,9,d[i].n)==0)h();g(i,d[i].src,d[i].n,got,d[i].want,9);if(d[i].n)h();}}
++          |                                                ^ ~
++    conftest.c:7:6: note: declared here
++        7 | void g(){}
++          |      ^
++
++Link: https://gmplib.org/list-archives/gmp-bugs/2024-November/005550.html
++Signed-off-by: Rudi Heitbaum <rudi@heitbaum.com>
++---
++ acinclude.m4 | 2 +-
++ 1 file changed, 1 insertion(+), 1 deletion(-)
++
++diff --git a/acinclude.m4 b/acinclude.m4
++index 9cf9483..1eed843 100644
++--- a/acinclude.m4
+++++ b/acinclude.m4
++@@ -609,7 +609,7 @@ GMP_PROG_CC_WORKS_PART([$1], [long long reliability test 1],
++ 
++ #if defined (__GNUC__) && ! defined (__cplusplus)
++ typedef unsigned long long t1;typedef t1*t2;
++-void g(){}
+++void g(int,const t1 *,t1,t1 *,const t1 *,int){}
++ void h(){}
++ static __inline__ t1 e(t2 rp,t2 up,int n,t1 v0)
++ {t1 c,x,r;int i;if(v0){c=1;for(i=1;i<n;i++){x=up[i];r=x+1;rp[i]=r;}}return c;}
++-- 
++2.39.5
++
+-- 
+2.39.5
+