From 0aaca0a6204d5fdd823fda311a91367d2d9d8097 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Matthias=20Bartelme=C3=9F?= <mba@fourplusone.de>
Date: Mon, 29 Aug 2022 23:25:50 +0200
Subject: [PATCH] fpc: support darwin

---
 .../compilers/fpc/binary-builder-darwin.sh    | 17 +++++++++++
 pkgs/development/compilers/fpc/binary.nix     | 21 ++++++++++++--
 pkgs/development/compilers/fpc/default.nix    | 28 ++++++++++++++++---
 .../compilers/fpc/remove-signature.sh         |  3 ++
 4 files changed, 63 insertions(+), 6 deletions(-)
 create mode 100755 pkgs/development/compilers/fpc/binary-builder-darwin.sh
 create mode 100755 pkgs/development/compilers/fpc/remove-signature.sh

diff --git a/pkgs/development/compilers/fpc/binary-builder-darwin.sh b/pkgs/development/compilers/fpc/binary-builder-darwin.sh
new file mode 100755
index 00000000000..f9bdf18e7d6
--- /dev/null
+++ b/pkgs/development/compilers/fpc/binary-builder-darwin.sh
@@ -0,0 +1,17 @@
+source $stdenv/setup
+
+pkgdir=$(pwd)/pkg
+deploydir=$(pwd)/deploy
+
+undmg $src
+mkdir $out
+mkdir $pkgdir
+mkdir $deploydir
+
+pkg=*.mpkg/Contents/Packages/*.pkg
+xar -xf $pkg -C $pkgdir
+pushd $deploydir
+cat $pkgdir/Payload | gunzip -dc | cpio -i
+popd
+echo $deploydir
+cp -r $deploydir/usr/local/* $out
diff --git a/pkgs/development/compilers/fpc/binary.nix b/pkgs/development/compilers/fpc/binary.nix
index e7afa7c7698..e4c8a2358fc 100644
--- a/pkgs/development/compilers/fpc/binary.nix
+++ b/pkgs/development/compilers/fpc/binary.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchurl }:
+{ stdenv, fetchurl, undmg, cpio, xar, lib }:
 
 stdenv.mkDerivation rec {
   pname = "fpc-binary";
@@ -20,9 +20,26 @@ stdenv.mkDerivation rec {
         url = "mirror://sourceforge/project/freepascal/Linux/${version}/fpc-${version}.aarch64-linux.tar";
         sha256 = "b39470f9b6b5b82f50fc8680a5da37d2834f2129c65c24c5628a80894d565451";
       }
+    else if stdenv.isDarwin then
+      fetchurl {
+        url = "mirror://sourceforge/project/freepascal/Mac%20OS%20X/${version}/fpc-${version}.intelarm64-macosx.dmg";
+        sha256 = "05d4510c8c887e3c68de20272abf62171aa5b2ef1eba6bce25e4c0bc41ba8b7d";
+      }
     else throw "Not supported on ${stdenv.hostPlatform.system}.";
 
-  builder = ./binary-builder.sh;
+
+  nativeBuildInputs = lib.optionals stdenv.hostPlatform.isDarwin [
+    undmg
+    xar
+    cpio
+  ];
+
+  builder =
+    if stdenv.hostPlatform.isLinux then
+      ./binary-builder.sh
+    else if stdenv.hostPlatform.isDarwin then
+      ./binary-builder-darwin.sh
+    else throw "Not supported on ${stdenv.hostPlatform}.";
 
   meta = {
     description = "Free Pascal Compiler from a binary distribution";
diff --git a/pkgs/development/compilers/fpc/default.nix b/pkgs/development/compilers/fpc/default.nix
index 2b14e48ba4b..ca16c08b572 100644
--- a/pkgs/development/compilers/fpc/default.nix
+++ b/pkgs/development/compilers/fpc/default.nix
@@ -1,6 +1,6 @@
-{ lib, stdenv, fetchurl, gawk, fetchpatch }:
+{ lib, stdenv, fetchurl, gawk, fetchpatch, undmg, cpio, xar, darwin, libiconv }:
 
-let startFPC = import ./binary.nix { inherit stdenv fetchurl; }; in
+let startFPC = import ./binary.nix { inherit stdenv fetchurl undmg cpio xar lib; }; in
 
 stdenv.mkDerivation rec {
   version = "3.2.2";
@@ -11,7 +11,12 @@ stdenv.mkDerivation rec {
     sha256 = "85ef993043bb83f999e2212f1bca766eb71f6f973d362e2290475dbaaf50161f";
   };
 
-  buildInputs = [ startFPC gawk ];
+  buildInputs = [ startFPC gawk ]
+    ++ lib.optionals stdenv.isDarwin [
+      libiconv
+      darwin.apple_sdk.frameworks.CoreFoundation
+    ];
+
   glibc = stdenv.cc.libc.out;
 
   # Patch paths for linux systems. Other platforms will need their own patches.
@@ -29,8 +34,18 @@ stdenv.mkDerivation rec {
     # substitute the markers set by the mark-paths patch
     substituteInPlace fpcsrc/compiler/systems/t_linux.pas --subst-var-by dynlinker-prefix "${glibc}"
     substituteInPlace fpcsrc/compiler/systems/t_linux.pas --subst-var-by syslibpath "${glibc}/lib"
+    # Replace the `codesign --remove-signature` command with a custom script, since `codesign` is not available
+    # in nixpkgs
+    substituteInPlace fpcsrc/compiler/Makefile \
+      --replace \
+        "\$(CODESIGN) --remove-signature" \
+        "${./remove-signature.sh}" \
+      --replace "ifneq (\$(CODESIGN),)" "ifeq (\$(OS_TARGET), darwin)"
   '';
 
+  NIX_LDFLAGS = lib.optionalString
+    stdenv.isDarwin (with darwin.apple_sdk.frameworks; "-F${CoreFoundation}/Library/Frameworks");
+
   makeFlags = [ "NOGDB=1" "FPC=${startFPC}/bin/fpc" ];
 
   installFlags = [ "INSTALL_PREFIX=\${out}" ];
@@ -41,6 +56,11 @@ stdenv.mkDerivation rec {
     done
     mkdir -p $out/lib/fpc/etc/
     $out/lib/fpc/*/samplecfg $out/lib/fpc/${version} $out/lib/fpc/etc/
+
+    # Generate config files in /etc since on darwin, ppc* does not follow symlinks
+    # to resolve the location of /etc
+    mkdir -p $out/etc
+    $out/lib/fpc/*/samplecfg $out/lib/fpc/${version} $out/etc
   '';
 
   passthru = {
@@ -52,6 +72,6 @@ stdenv.mkDerivation rec {
     homepage = "https://www.freepascal.org";
     maintainers = [ maintainers.raskin ];
     license = with licenses; [ gpl2 lgpl2 ];
-    platforms = platforms.linux;
+    platforms = platforms.unix;
   };
 }
diff --git a/pkgs/development/compilers/fpc/remove-signature.sh b/pkgs/development/compilers/fpc/remove-signature.sh
new file mode 100755
index 00000000000..9fed8ab057c
--- /dev/null
+++ b/pkgs/development/compilers/fpc/remove-signature.sh
@@ -0,0 +1,3 @@
+source $stdenv/setup
+
+codesign_allocate -r -i "$1" -o "$1"