treewide: NIX_*_FLAGS -> string

pkgs/os-specific/linux/kernel/perf.nix

@@ -46,13 +46,13 @@ stdenv.mkDerivation {
 
   # Note: we don't add elfutils to buildInputs, since it provides a
   # bad `ld' and other stuff.
-  NIX_CFLAGS_COMPILE =
-    [ "-Wno-error=cpp"
-      "-Wno-error=bool-compare"
-      "-Wno-error=deprecated-declarations"
-      "-DOBJDUMP_PATH=\"${binutils}/bin/objdump\""
-      "-Wno-error=stringop-truncation"
-    ];
+  NIX_CFLAGS_COMPILE = toString [
+    "-Wno-error=cpp"
+    "-Wno-error=bool-compare"
+    "-Wno-error=deprecated-declarations"
+    "-DOBJDUMP_PATH=\"${binutils}/bin/objdump\""
+    "-Wno-error=stringop-truncation"
+  ];
 
   doCheck = false; # requires "sparse"
   doInstallCheck = false; # same

pkgs/os-specific/linux/lttng-modules/default.nix

@@ -14,7 +14,7 @@ stdenv.mkDerivation rec {
 
   hardeningDisable = [ "pic" ];
 
-  NIX_CFLAGS_COMPILE = [ "-Wno-error=implicit-function-declaration" ];
+  NIX_CFLAGS_COMPILE = "-Wno-error=implicit-function-declaration";
 
   preConfigure = ''
     export KERNELDIR="${kernel.dev}/lib/modules/${kernel.modDirVersion}/build"

pkgs/os-specific/linux/pktgen/default.nix

@@ -22,7 +22,7 @@ stdenv.mkDerivation rec {
   RTE_TARGET = "x86_64-native-linuxapp-gcc";
   GUI = stdenv.lib.optionalString withGtk "true";
 
-  NIX_CFLAGS_COMPILE = [ "-msse3" ];
+  NIX_CFLAGS_COMPILE = "-msse3";
 
   postPatch = let dpdkMajor = lib.versions.major dpdk.version; in ''
     substituteInPlace lib/common/lscpu.h --replace /usr/bin/lscpu ${utillinux}/bin/lscpu

pkgs/os-specific/linux/sysdig/default.nix

@@ -28,10 +28,7 @@ stdenv.mkDerivation rec {
   ] ++ optional (kernel == null) "-DBUILD_DRIVER=OFF";
 
   # needed since luajit-2.1.0-beta3
-  NIX_CFLAGS_COMPILE = [
-    "-DluaL_reg=luaL_Reg"
-    "-DluaL_getn(L,i)=((int)lua_objlen(L,i))"
-  ];
+  NIX_CFLAGS_COMPILE = "-DluaL_reg=luaL_Reg -DluaL_getn(L,i)=((int)lua_objlen(L,i))";
 
   preConfigure = ''
     cmakeFlagsArray+=(-DCMAKE_EXE_LINKER_FLAGS="-ltbb -lcurl")