libfyaml: fixed building issues (#515614)

pkgs/by-name/li/libfyaml/package.nix

@@ -25,10 +25,29 @@ stdenv.mkDerivation (finalAttrs: {
       url = "https://github.com/pantoniou/libfyaml/commit/0982fcefc6a16d4c8cb5b06747d3fc8e630de3ae.diff";
       hash = "sha256-aDubIn+et+1fWE7XU7a5AGZVacVFbAbC1PoSDrA6hXw=";
     })
+    # backport "Fix C11 atomics detection and buggy macros for C++ compatibility"
+    (fetchpatch {
+      url = "https://github.com/pantoniou/libfyaml/commit/1026d76850909dc9b1c5f95b8cd94e865a313fd5.diff";
+      hash = "sha256-0YfOqdqHdELFMqr52TDAC3BNFLkcuxvuJY5b9yZ7NFk=";
+    })
     (fetchpatch {
       url = "https://github.com/pantoniou/libfyaml/commit/9192deaac095f9881cc1e5756dede683f36b09d6.diff";
       hash = "sha256-cNL9wQtxIRg/ShZLJP4qHYNFRrYo9kRG+/U+3FiUeaI=";
     })
+    # On Darwin, AX_PTHREAD returns empty PTHREAD_LIBS with -pthread in PTHREAD_CFLAGS;
+    # don't force -lpthread when PTHREAD_CFLAGS already provides pthread support.
+    # Pending PR: https://github.com/pantoniou/libfyaml/pull/294
+    ./pthread-darwin.patch
+
+    # backport "build: don't output 'none required' to LIBM if no linker flags needed for it"
+    (fetchpatch {
+      url = "https://github.com/pantoniou/libfyaml/commit/24b18e7363b336962fe160c1dc05ca57ba95783c.diff";
+      hash = "sha256-g5QKI4HuS8MEQ9ddIQNC0j+28Dh9zLAp5RaZX5SWBHk=";
+    })
+    (fetchpatch {
+      url = "https://github.com/pantoniou/libfyaml/commit/9f2492ca27bb1fda64f2b12edc2da17406208b93.diff";
+      hash = "sha256-E4wS+P7R3VGrBpD7swWMMi/QPTF+9rzAeEyxhbmdiwk=";
+    })
   ];
 
   nativeBuildInputs = [

pkgs/by-name/li/libfyaml/pthread-darwin.patch

@@ -0,0 +1,12 @@
+--- a/configure.ac
++++ b/configure.ac
+@@ -99,6 +99,7 @@
+ AX_PTHREAD([], [AC_MSG_ERROR("Missing required pthread support")])
+ 
+-# in some cases PTHREAD_LIBS is empty - force -lpthread */
+-if test "x$PTHREAD_LIBS" = "x"; then
++# In some cases PTHREAD_LIBS is empty; force -lpthread only when PTHREAD_CFLAGS
++# also provides no pthread support (e.g. on Darwin, -pthread in CFLAGS suffices).
++if test "x$PTHREAD_LIBS" = "x" && test "x$PTHREAD_CFLAGS" = "x"; then
+ 	PTHREAD_LIBS="-lpthread"
+ fi