misc pkgs: Remove unneeded *Platform == *Platform comparisons

PR #26007 used these to avoid causing a mass rebuild. Now that we know
things work, we do that to clean up.

pkgs/applications/audio/mpg123/default.nix

@@ -1,6 +1,6 @@
 { stdenv
 , fetchurl, alsaLib
-, buildPlatform, hostPlatform
+, hostPlatform
 }:
 
 stdenv.mkDerivation rec {
@@ -13,7 +13,7 @@ stdenv.mkDerivation rec {
 
   buildInputs = stdenv.lib.optional (!stdenv.isDarwin) alsaLib;
 
-  ${if buildPlatform != hostPlatform then "configureFlags" else null} =
+  configureFlags =
     stdenv.lib.optional (hostPlatform ? mpg123) "--with-cpu=${hostPlatform.mpg123.cpu}";
 
   meta = {

pkgs/applications/editors/ed/default.nix

@@ -32,7 +32,13 @@ stdenv.mkDerivation rec {
     */
   doCheck = !(hostPlatform.isDarwin || hostPlatform != buildPlatform);
 
-  configureFlags = if hostPlatform == buildPlatform then null else [
+  # TODO(@Ericson2314): Use placeholder to make this a configure flag once Nix
+  # 1.12 is released.
+  preConfigure = ''
+    export DESTDIR=$out
+  '';
+
+  configureFlags = [
     "--exec-prefix=${stdenv.cc.prefix}"
     "CC=${stdenv.cc.prefix}cc"
   ];

pkgs/development/compilers/rust/rustc.nix

@@ -138,8 +138,7 @@ stdenv.mkDerivation {
 
   inherit doCheck;
 
-  ${if buildPlatform == hostPlatform then "dontSetConfigureCross" else null} = true;
-  ${if buildPlatform != hostPlatform then "configurePlatforms" else null} = [];
+  configurePlatforms = [];
 
   # https://github.com/NixOS/nixpkgs/pull/21742#issuecomment-272305764
   # https://github.com/rust-lang/rust/issues/30181

pkgs/development/libraries/glew/1.10.nix

@@ -38,8 +38,8 @@ stdenv.mkDerivation rec {
     cp -r README.txt LICENSE.txt doc $out/share/doc/glew
   '';
 
-  makeFlags = if hostPlatform == buildPlatform then null else [
-    "SYSTEM=${if hostPlatform.isMinGW then "mingw" else hostPlatform.parsed.kernel}"
+  makeFlags = [
+    "SYSTEM=${if hostPlatform.isMinGW then "mingw" else hostPlatform.parsed.kernel.name}"
   ];
 
   meta = with stdenv.lib; {

pkgs/development/libraries/glew/default.nix

@@ -39,8 +39,8 @@ stdenv.mkDerivation rec {
     rm $out/lib/*.a
   '';
 
-  makeFlags = if hostPlatform == buildPlatform then null else [
-    "SYSTEM=${if hostPlatform.isMinGW then "mingw" else hostPlatform.parsed.kernel}"
+  makeFlags = [
+    "SYSTEM=${if hostPlatform.isMinGW then "mingw" else hostPlatform.parsed.kernel.name}"
   ];
 
   meta = with stdenv.lib; {

pkgs/development/libraries/libelf/default.nix

@@ -11,9 +11,8 @@ stdenv.mkDerivation rec {
     sha256 = "0vf7s9dwk2xkmhb79aigqm0x0yfbw1j0b9ksm51207qwr179n6jr";
   };
 
-  # TODO(@Ericson2314) Make unconditional next hash break
-  patches = if hostPlatform == buildPlatform then null else [
-    ./cross-ar.patch
+  patches = [
+    ./dont-hardcode-ar.patch
   ];
 
   doCheck = true;

pkgs/development/libraries/zlib/default.nix

@@ -4,10 +4,9 @@
 , static ? false
 }:
 
-let version = "1.2.11"; in
-
 stdenv.mkDerivation rec {
   name = "zlib-${version}";
+  version = "1.2.11";
 
   src = fetchurl {
     urls =
@@ -19,7 +18,7 @@ stdenv.mkDerivation rec {
 
   patches = stdenv.lib.optional hostPlatform.isCygwin ./disable-cygwin-widechar.patch;
 
-  postPatch = stdenv.lib.optionalString stdenv.isDarwin ''
+  postPatch = stdenv.lib.optionalString hostPlatform.isDarwin ''
     substituteInPlace configure \
       --replace '/usr/bin/libtool' 'ar' \
       --replace 'AR="libtool"' 'AR="ar"' \
@@ -30,14 +29,6 @@ stdenv.mkDerivation rec {
   setOutputFlags = false;
   outputDoc = "dev"; # single tiny man3 page
 
-  # TODO(@Dridus) CC set by cc-wrapper setup-hook, so just empty out the preConfigure script when cross building, but leave the old incorrect script when not
-  # cross building to avoid hash breakage. Once hash breakage is acceptable, remove preConfigure entirely.
-  preConfigure = stdenv.lib.optionalString (hostPlatform == buildPlatform) ''
-    if test -n "$crossConfig"; then
-      export CC=$crossConfig-gcc
-    fi
-  '';
-
   # FIXME needs gcc 4.9 in bootstrap tools
   hardeningDisable = [ "stackprotector" ];
 
@@ -49,36 +40,41 @@ stdenv.mkDerivation rec {
     # jww (2015-01-06): Sometimes this library install as a .so, even on
     # Darwin; others time it installs as a .dylib.  I haven't yet figured out
     # what causes this difference.
-  + stdenv.lib.optionalString stdenv.isDarwin ''
+  + stdenv.lib.optionalString hostPlatform.isDarwin ''
     for file in $out/lib/*.so* $out/lib/*.dylib* ; do
       install_name_tool -id "$file" $file
     done
+  ''
+    # Non-typical naming confuses libtool which then refuses to use zlib's DLL
+    # in some cases, e.g. when compiling libpng.
+  + stdenv.lib.optionalString (hostPlatform.libc == "msvcrt") ''
+    ln -s zlib1.dll $out/bin/libz.dll
   '';
 
   # As zlib takes part in the stdenv building, we don't want references
   # to the bootstrap-tools libgcc (as uses to happen on arm/mips)
-  NIX_CFLAGS_COMPILE = stdenv.lib.optionalString (!stdenv.isDarwin) "-static-libgcc";
+  NIX_CFLAGS_COMPILE = stdenv.lib.optionalString (!hostPlatform.isDarwin) "-static-libgcc";
 
-  crossAttrs = {
-    dontStrip = static;
-    configurePlatforms = [];
-  } // stdenv.lib.optionalAttrs (hostPlatform.libc == "msvcrt") {
-    installFlags = [
-      "BINARY_PATH=$(out)/bin"
-      "INCLUDE_PATH=$(dev)/include"
-      "LIBRARY_PATH=$(out)/lib"
-    ];
-    makeFlags = [
-      "-f" "win32/Makefile.gcc"
-      "PREFIX=${stdenv.cc.prefix}"
-    ] ++ stdenv.lib.optional (!static) "SHARED_MODE=1";
+  dontStrip = hostPlatform != buildPlatform && static;
+  configurePlatforms = [];
 
-    # Non-typical naming confuses libtool which then refuses to use zlib's DLL
-    # in some cases, e.g. when compiling libpng.
-    postInstall = postInstall + "ln -s zlib1.dll $out/bin/libz.dll";
-  };
+  installFlags = stdenv.lib.optionals (hostPlatform.libc == "msvcrt") [
+    "BINARY_PATH=$(out)/bin"
+    "INCLUDE_PATH=$(dev)/include"
+    "LIBRARY_PATH=$(out)/lib"
+  ];
 
-  passthru.version = version;
+  makeFlags = [
+    "PREFIX=${stdenv.cc.prefix}"
+  ] ++ stdenv.lib.optionals (hostPlatform.libc == "msvcrt") [
+    "-f" "win32/Makefile.gcc"
+  ] ++ stdenv.lib.optionals (!static) [
+    "SHARED_MODE=1"
+  ];
+
+  passthru = {
+    inherit version;
+  };
 
   meta = with stdenv.lib; {
     description = "Lossless data-compression library";

pkgs/development/tools/misc/binutils/default.nix

@@ -8,10 +8,13 @@ let
   version = "2.28";
   basename = "binutils-${version}";
   inherit (stdenv.lib) optional optionals optionalString;
+  # The prefix prepended to binary names to allow multiple binuntils on the
+  # PATH to both be usable.
+  prefix = optionalString (targetPlatform != hostPlatform) "${targetPlatform.config}-";
 in
 
 stdenv.mkDerivation rec {
-  name = optionalString (targetPlatform != hostPlatform) "${targetPlatform.config}-" + basename;
+  name = prefix + basename;
 
   src = fetchurl {
     url = "mirror://gnu/binutils/${basename}.tar.bz2";
@@ -78,15 +81,20 @@ stdenv.mkDerivation rec {
     then "-Wno-string-plus-int -Wno-deprecated-declarations"
     else "-static-libgcc";
 
+  # TODO(@Ericson2314): Always pass "--target" and always prefix.
+  configurePlatforms = [ "build" "host" ] ++ stdenv.lib.optional (targetPlatform != hostPlatform) "target";
   configureFlags =
     [ "--enable-shared" "--enable-deterministic-archives" "--disable-werror" ]
     ++ optional (stdenv.system == "mips64el-linux") "--enable-fix-loongson2f-nop"
-    ++ optional (targetPlatform != hostPlatform) "--target=${targetPlatform.config}" # TODO: make this unconditional
     ++ optionals gold [ "--enable-gold" "--enable-plugins" ]
     ++ optional (stdenv.system == "i686-linux") "--enable-targets=x86_64-linux-gnu";
 
   enableParallelBuilding = true;
 
+  passthru = {
+    inherit prefix;
+  };
+
   meta = with stdenv.lib; {
     description = "Tools for manipulating binaries (linker, assembler, etc.)";
     longDescription = ''

pkgs/development/tools/misc/gdb/default.nix

@@ -48,15 +48,16 @@ stdenv.mkDerivation rec {
 
   NIX_CFLAGS_COMPILE = "-Wno-format-nonliteral";
 
+  # TODO(@Ericson2314): Always pass "--target" and always prefix.
+  configurePlatforms = [ "build" "host" ] ++ stdenv.lib.optional (targetPlatform != hostPlatform) "target";
+
   configureFlags = with stdenv.lib; [
     "--with-gmp=${gmp.dev}" "--with-mpfr=${mpfr.dev}" "--with-system-readline"
     "--with-system-zlib" "--with-expat" "--with-libexpat-prefix=${expat.dev}"
   ] ++ stdenv.lib.optional hostPlatform.isLinux
       # TODO(@Ericson2314): make this conditional on whether host platform is NixOS
       "--with-separate-debug-dir=/run/current-system/sw/lib/debug"
     ++ stdenv.lib.optional (!pythonSupport) "--without-python"
-    # TODO(@Ericson2314): This should be done in stdenv, not per-package
-    ++ stdenv.lib.optional (targetPlatform != hostPlatform) "--target=${targetPlatform.config}"
     ++ stdenv.lib.optional multitarget "--enable-targets=all";
 
   postInstall =

pkgs/os-specific/darwin/binutils/default.nix

@@ -2,11 +2,12 @@
 , hostPlatform, targetPlatform
 }:
 
-let
-  prefix = stdenv.lib.optionalString
-    (targetPlatform != hostPlatform)
-    "${targetPlatform.config}-";
+# Make sure both underlying packages claim to have prepended their binaries
+# with the same prefix.
+assert binutils-raw.prefix == cctools.prefix;
 
+let
+  inherit (binutils-raw) prefix;
   cmds = [
     "ar" "ranlib" "as" "dsymutil" "install_name_tool"
     "ld" "strip" "otool" "lipo" "nm" "strings" "size"
@@ -50,4 +51,8 @@ stdenv.mkDerivation {
 
     ln -s ${cctools}/libexec $out/libexec
   '';
+
+  passthru = {
+    inherit prefix;
+  };
 }

pkgs/os-specific/darwin/cctools/port.nix

@@ -1,10 +1,12 @@
 { stdenv, fetchFromGitHub, makeWrapper, autoconf, automake, libtool_2
 , llvm, libcxx, libcxxabi, clang, libuuid
 , libobjc ? null, maloader ? null, xctoolchain ? null
-, buildPlatform, hostPlatform, targetPlatform
+, hostPlatform, targetPlatform
 }:
 
 let
+  # The prefix prepended to binary names to allow multiple binuntils on the
+  # PATH to both be usable.
   prefix = stdenv.lib.optionalString
     (targetPlatform != hostPlatform)
     "${targetPlatform.config}-";
@@ -38,13 +40,10 @@ let
 
     enableParallelBuilding = true;
 
+    # TODO(@Ericson2314): Always pass "--target" and always prefix.
+    configurePlatforms = [ "build" "host" ] ++ stdenv.lib.optional (targetPlatform != hostPlatform) "target";
     configureFlags = stdenv.lib.optionals (!stdenv.isDarwin) [
       "CXXFLAGS=-I${libcxx}/include/c++/v1"
-    ] ++ stdenv.lib.optionals (targetPlatform != buildPlatform) [
-      # TODO make unconditional next hash break
-      "--build=${buildPlatform.config}"
-      "--host=${hostPlatform.config}"
-      "--target=${targetPlatform.config}"
     ];
 
     postPatch = ''
@@ -104,6 +103,10 @@ let
         done
       '';
 
+    passthru = {
+      inherit prefix;
+    };
+
     meta = {
       homepage = "http://www.opensource.apple.com/source/cctools/";
       description = "Mac OS X Compiler Tools (cross-platform port)";

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

@@ -63,7 +63,7 @@ stdenv.mkDerivation rec {
     CONFIG_DEFAULT_SETFONT_DIR "/etc/kbd"
 
     ${extraConfig}
-    $extraCrossConfig
+    CONFIG_CROSS_COMPILER_PREFIX "${stdenv.cc.prefix}"
     EOF
 
     make oldconfig
@@ -79,10 +79,6 @@ stdenv.mkDerivation rec {
 
   buildInputs = lib.optionals (enableStatic && !useMusl) [ stdenv.cc.libc stdenv.cc.libc.static ];
 
-  extraCrossConfig = if hostPlatform == buildPlatform then null else ''
-    CONFIG_CROSS_COMPILER_PREFIX "${stdenv.cc.prefix}"
-  '';
-
   enableParallelBuilding = true;
 
   meta = with stdenv.lib; {

pkgs/tools/archivers/unzip/default.nix

@@ -1,7 +1,6 @@
 { stdenv, fetchurl
 , bzip2
 , enableNLS ? false, libnatspec
-, buildPlatform, hostPlatform
 }:
 
 stdenv.mkDerivation {
@@ -23,13 +22,13 @@ stdenv.mkDerivation {
     ./CVE-2015-7697.diff
     ./CVE-2014-9913.patch
     ./CVE-2016-9844.patch
+    ./dont-hardcode-cc.patch
   ] ++ stdenv.lib.optional enableNLS
     (fetchurl {
       url = "http://sources.gentoo.org/cgi-bin/viewvc.cgi/gentoo-x86/app-arch/unzip/files/unzip-6.0-natspec.patch?revision=1.1";
       name = "unzip-6.0-natspec.patch";
       sha256 = "67ab260ae6adf8e7c5eda2d1d7846929b43562943ec4aff629bd7018954058b1";
-    })
-    ++ stdenv.lib.optional (hostPlatform != buildPlatform) ./cross-cc.patch;
+    });
 
   nativeBuildInputs = [ bzip2 ];
   buildInputs = [ bzip2 ] ++ stdenv.lib.optional enableNLS libnatspec;

pkgs/tools/archivers/unzip/cross-cc.patch → pkgs/tools/archivers/unzip/dont-hardcode-cc.patch

@@ -1,12 +1,14 @@
 --- a/unix/Makefile
 +++ b/unix/Makefile
-@@ -42,9 +42,7 @@
+@@ -42,9 +42,9 @@
  # such as -DDOSWILD).
 
  # UnZip flags
 -CC = cc#	try using "gcc" target rather than changing this (CC and LD
++CC ?= cc#	try using "gcc" target rather than changing this (CC and LD
  LD = $(CC)#	must match, else "unresolved symbol:  ___main" is possible)
 -AS = as
++AS ?= as
  LOC = $(D_USE_BZ2) $(LOCAL_UNZIP)
  AF = $(LOC)
  CFLAGS = -O

pkgs/tools/misc/coreutils/default.nix

@@ -70,7 +70,7 @@ stdenv.mkDerivation rec {
     && builtins.storeDir == "/nix/store";
 
   # Prevents attempts of running 'help2man' on cross-built binaries.
-  ${if hostPlatform == buildPlatform then null else "PERL"} = "missing";
+  PERL = if hostPlatform == buildPlatform then null else "missing";
 
   # Saw random failures like ‘help2man: can't get '--help' info from
   # man/sha512sum.td/sha512sum’.
@@ -83,11 +83,11 @@ stdenv.mkDerivation rec {
 
   # Works around a bug with 8.26:
   # Makefile:3440: *** Recursive variable 'INSTALL' references itself (eventually).  Stop.
-  ${if hostPlatform == buildPlatform then null else "preInstall"} = ''
+  preInstall = optionalString (hostPlatform != buildPlatform) ''
     sed -i Makefile -e 's|^INSTALL =.*|INSTALL = ${buildPackages.coreutils}/bin/install -c|'
   '';
 
-  ${if hostPlatform == buildPlatform then null else "postInstall"} = ''
+  postInstall = optionalString (hostPlatform != buildPlatform) ''
     rm $out/share/man/man1/*
     cp ${buildPackages.coreutils}/share/man/man1/* $out/share/man/man1
   '';

pkgs/tools/system/ddrescue/default.nix

@@ -17,11 +17,6 @@ stdenv.mkDerivation rec {
 
   doCheck = hostPlatform == buildPlatform;
 
-  ${if hostPlatform != buildPlatform then "crossPlatforms" else null} = [ ];
-  ${if hostPlatform != buildPlatform then "configureFlags" else null} = [
-    "CXX=${stdenv.cc.prefix}c++"
-  ];
-
   meta = with stdenv.lib; {
     description = "GNU ddrescue, a data recovery tool";