From eb6a294bd8a0a292967214d1254debcc6e41220e Mon Sep 17 00:00:00 2001
From: Gaetan Lepage <gaetan@glepage.com>
Date: Mon, 26 Jan 2026 14:06:13 +0000
Subject: [PATCH] cudaPackages.cuda_nvcc: patch math_functions.h signatures

Fix compatibility with glibc 2.42
---
 .../cuda-modules/packages/cuda_nvcc.nix       | 27 +++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/pkgs/development/cuda-modules/packages/cuda_nvcc.nix b/pkgs/development/cuda-modules/packages/cuda_nvcc.nix
index dd2b85934b29d..843736314013b 100644
--- a/pkgs/development/cuda-modules/packages/cuda_nvcc.nix
+++ b/pkgs/development/cuda-modules/packages/cuda_nvcc.nix
@@ -6,6 +6,7 @@
   cudaAtLeast,
   cudaOlder,
   cuda_cccl,
+  glibc,
   lib,
   libnvvm,
   makeBinaryWrapper,
@@ -163,6 +164,32 @@ buildRedist (finalAttrs: {
           "''${!outputBin:?}/bin/nvcc" \
           --prefix PATH : ${lib.makeBinPath [ backendStdenv.cc ]}
       ''
+      # Fix compatibility with glibc 2.42:
+      # The cospi|sinpi|rsqrt function signatures in include/common/math_functions.h do not match
+      # glibc 2.42's.
+      # Indeed, there they are declared with noexcept(true) which is not the case in cuda_nvcc.
+      + lib.optionals (lib.versionAtLeast glibc.version "2.42") ''
+        nixLog "Patching math_functions.h signatures to match glibc's ones"
+        substituteInPlace "''${!outputInclude:?}/include/crt/math_functions.h" \
+          --replace-fail \
+            "sinpi(double x);" \
+            "sinpi(double x) noexcept (true);" \
+          --replace-fail \
+            "sinpif(float x);" \
+            "sinpif(float x) noexcept (true);" \
+          --replace-fail \
+            "cospi(double x);" \
+            "cospi(double x) noexcept (true);" \
+          --replace-fail \
+            "cospif(float x);" \
+            "cospif(float x) noexcept (true);" \
+          --replace-fail \
+            "rsqrt(double x);" \
+            "rsqrt(double x) noexcept (true);" \
+          --replace-fail \
+            "rsqrtf(float x);" \
+            "rsqrtf(float x) noexcept (true);"
+      ''
     );
 
   brokenAssertions = [