fluent-bit: fix build on darwin

- Update fix-luajit-darwin.patch to apply to the current version.

- Add a patch to fix compilation of cmetrics on darwin.

- Use default stdenv instead of gccStdenv. The only requirement for GCC
  was the bundled luajit having 'DEFAULT_CC = gcc' hardcoded, but it has
  been fixed with the updated fix-luajit-darwin.patch by adding
  DEFAULT_CC=cc to the arguments.

pkgs/tools/misc/fluent-bit/default.nix

@@ -11,14 +11,17 @@ stdenv.mkDerivation rec {
     sha256 = "sha256-b+MZuZQB/sl0HcioU1KCxH3TNiXYSPBfC9dBKqCVeXk=";
   };
 
+  patches = lib.optionals stdenv.isDarwin [
+    ./fix-cmetrics-darwin.patch
+    ./fix-luajit-darwin.patch
+  ];
+
   nativeBuildInputs = [ cmake flex bison ];
 
   buildInputs = lib.optionals stdenv.isLinux [ systemd ];
 
   cmakeFlags = [ "-DFLB_METRICS=ON" "-DFLB_HTTP_SERVER=ON" ];
 
-  patches = lib.optionals stdenv.isDarwin [ ./fix-luajit-darwin.patch ];
-
   # _FORTIFY_SOURCE requires compiling with optimization (-O)
   NIX_CFLAGS_COMPILE = lib.optionalString stdenv.cc.isGNU "-O";
 

pkgs/tools/misc/fluent-bit/fix-cmetrics-darwin.patch

@@ -0,0 +1,23 @@
+diff --git i/lib/cmetrics/src/cmt_time.c w/lib/cmetrics/src/cmt_time.c
+--- i/lib/cmetrics/src/cmt_time.c
++++ w/lib/cmetrics/src/cmt_time.c
+@@ -20,7 +20,7 @@
+ #include <cmetrics/cmt_info.h>
+ 
+ /* MacOS */
+-#ifdef FLB_HAVE_CLOCK_GET_TIME
++#ifdef CMT_HAVE_CLOCK_GET_TIME
+ #include <mach/clock.h>
+ #include <mach/mach.h>
+ #endif
+@@ -41,8 +41,8 @@
+     mach_timespec_t mts;
+     host_get_clock_service(mach_host_self(), CALENDAR_CLOCK, &cclock);
+     clock_get_time(cclock, &mts);
+-    tm->tv_sec = mts.tv_sec;
+-    tm->tv_nsec = mts.tv_nsec;
++    tm.tv_sec = mts.tv_sec;
++    tm.tv_nsec = mts.tv_nsec;
+     mach_port_deallocate(mach_task_self(), cclock);
+ #else /* __STDC_VERSION__ */
+     clock_gettime(CLOCK_REALTIME, &tm);

pkgs/tools/misc/fluent-bit/fix-luajit-darwin.patch

@@ -1,14 +1,29 @@
 diff -Naur fluent-bit.old/cmake/luajit.cmake fluent-bit.new/cmake/luajit.cmake
 --- fluent-bit.old/cmake/luajit.cmake
 +++ fluent-bit.new/cmake/luajit.cmake
-@@ -11,10 +11,6 @@
- set(LUAJIT_SRC ${CMAKE_CURRENT_SOURCE_DIR}/${FLB_PATH_LIB_LUAJIT})
+@@ -12,15 +12,7 @@
  set(LUAJIT_DEST ${CMAKE_CURRENT_BINARY_DIR})
  
--if (CMAKE_SYSTEM_NAME MATCHES "Darwin")
--  set(CFLAGS "${CFLAGS} -isysroot ${CMAKE_OSX_SYSROOT}")
--endif()
--
+ if (CMAKE_SYSTEM_NAME MATCHES "Darwin")
+-  set(CFLAGS "${CFLAGS} -isysroot ${CMAKE_OSX_SYSROOT} -fno-stack-check")
+-  if (CMAKE_HOST_SYSTEM_VERSION VERSION_GREATER_EQUAL 20
+-      AND CMAKE_HOST_SYSTEM_VERSION VERSION_LESS 21)
+-    set(DEPLOYMENT_TARGET "MACOSX_DEPLOYMENT_TARGET=11.0")
+-  else()
+-    set(DEPLOYMENT_TARGET "MACOSX_DEPLOYMENT_TARGET=10.15")
+-  endif()
+-else()
+-  set(DEPLOYMENT_TARGET "")
++  set(CFLAGS "${CFLAGS} -fno-stack-check")
+ endif()
+ 
  # luajit (UNIX)
- # =============
- ExternalProject_Add(luajit
+@@ -30,7 +22,7 @@
+   EXCLUDE_FROM_ALL TRUE
+   SOURCE_DIR ${LUAJIT_SRC}
+   CONFIGURE_COMMAND ./configure
+-  BUILD_COMMAND $(MAKE) CROSS=${CROSS_PREFIX} CFLAGS=${CFLAGS} BUILD_MODE=static "XCFLAGS=-fPIC" ${DEPLOYMENT_TARGET}
++  BUILD_COMMAND $(MAKE) DEFAULT_CC=cc CROSS=${CROSS_PREFIX} CFLAGS=${CFLAGS} BUILD_MODE=static "XCFLAGS=-fPIC"
+   INSTALL_COMMAND cp src/libluajit.a "${LUAJIT_DEST}/lib/libluajit.a")
+ 
+ # luajit (Windows)

pkgs/top-level/all-packages.nix

@@ -5159,9 +5159,7 @@ with pkgs;
     icu = icu63;
   };
 
-  fluent-bit = callPackage ../tools/misc/fluent-bit {
-    stdenv = gccStdenv;
-  };
+  fluent-bit = callPackage ../tools/misc/fluent-bit { };
 
   flux = callPackage ../development/compilers/flux { };