From 3c6f2bf301d529c0836ef591af2663a429850964 Mon Sep 17 00:00:00 2001
From: vasilito <adminpupkin@gmail.com>
Date: Sun, 28 Jun 2026 16:12:48 +0300
Subject: [PATCH] relibc: mirror fresh libc to prefix and redoxer toolchain
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After cooking relibc, copy the freshly built libc.a and libc.so to both
the prefix toolchain and the redoxer toolchain (the latter is what
'make live' actually consumes for cross-recipe builds).

Without this, recipes that link against the dynamic libc.so see a stale
copy (no eventfd, no __fseterr, ...) and fail with 'undefined reference'
at link time. 'make prefix' does this sync via its sysroot rule, but
'make r.relibc' alone does not — covering both paths prevents the
first recipe that needs a new symbol from breaking the build.
---
 recipes/core/relibc/recipe.toml | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/recipes/core/relibc/recipe.toml b/recipes/core/relibc/recipe.toml
index 1a28c222e2..77e1002766 100644
--- a/recipes/core/relibc/recipe.toml
+++ b/recipes/core/relibc/recipe.toml
@@ -37,4 +37,26 @@ export CARGO=${CARGO:-env -u CARGO cargo}
 sed -i '/^int vfprintf(/s/\\.\\.\\./va_list ap/' "${COOKBOOK_STAGE}/usr/include/stdio.h"
 sed -i '/^int vsnprintf(/s/\\.\\.\\./va_list ap/' "${COOKBOOK_STAGE}/usr/include/stdio.h"
 sed -i '/^int vsprintf(/s/\\.\\.\\./va_list ap/' "${COOKBOOK_STAGE}/usr/include/stdio.h"
+
+# Mirror the freshly built libc into the prefix toolchain. `make prefix`
+# does this via mk/prefix.mk, but `make r.relibc` alone does not, and
+# recipes that link against the dynamic libc.so would otherwise see a
+# stale libc.so (no eventfd, no __fseterr, ...) and fail with
+# "undefined reference" at link time. The redoxer toolchain is what
+# `make live` actually consumes for cross-recipe builds, so it must
+# stay in sync too.
+PREFIX_LIB_DIR="${COOKBOOK_HOST_SYSROOT%/}/${TARGET}/lib"
+if [ -d "${PREFIX_LIB_DIR}" ]; then
+    cp -f "${COOKBOOK_STAGE}/usr/lib/libc.a" "${PREFIX_LIB_DIR}/" 2>/dev/null || true
+    if [ -f "${COOKBOOK_STAGE}/usr/lib/libc.so" ]; then
+        cp -f "${COOKBOOK_STAGE}/usr/lib/libc.so" "${PREFIX_LIB_DIR}/" 2>/dev/null || true
+    fi
+fi
+REDOXER_TC_LIB="${HOME}/.redoxer/${TARGET}/toolchain/${TARGET}/lib"
+if [ -d "${REDOXER_TC_LIB}" ]; then
+    cp -f "${COOKBOOK_STAGE}/usr/lib/libc.a" "${REDOXER_TC_LIB}/" 2>/dev/null || true
+    if [ -f "${COOKBOOK_STAGE}/usr/lib/libc.so" ]; then
+        cp -f "${COOKBOOK_STAGE}/usr/lib/libc.so" "${REDOXER_TC_LIB}/" 2>/dev/null || true
+    fi
+fi
 """