hare: enable cross-compilation

pkgs/by-name/ha/hare/002-dont-build-haredoc.patch

@@ -0,0 +1,43 @@
+diff --git a/Makefile b/Makefile
+index 2482be1f..9d58bc81 100644
+--- a/Makefile
++++ b/Makefile
+@@ -5,7 +5,7 @@ all:
+ include config.mk
+ include makefiles/$(PLATFORM).$(ARCH).mk
+ 
+-all: $(BINOUT)/hare $(BINOUT)/haredoc docs
++all: $(BINOUT)/hare docs
+ 
+ HARE_DEFINES = \
+ 	-D PLATFORM:str='"$(PLATFORM)"' \
+@@ -79,11 +79,10 @@ docs: \
+ 	docs/haredoc.1 \
+ 	docs/hare-run.1 \
+ 	docs/hare-test.1 \
+-	docs/haredoc.5 \
+ 	docs/hare-module.5
+ 
+-MAN1 = hare hare-build hare-cache hare-deps haredoc hare-run hare-test
+-MAN5 = haredoc hare-module
++MAN1 = hare hare-build hare-cache hare-deps hare-run hare-test
++MAN5 = hare-module
+ 
+ bootstrap:
+ 	@BINOUT=$(BINOUT) ./scripts/genbootstrap
+@@ -104,7 +103,6 @@ install-cmd:
+ 		'$(DESTDIR)$(BINDIR)' '$(DESTDIR)$(MANDIR)/man1' \
+ 		'$(DESTDIR)$(BINDIR)' '$(DESTDIR)$(MANDIR)/man5'
+ 	install -m755 '$(BINOUT)/hare' '$(DESTDIR)$(BINDIR)/hare'
+-	install -m755 '$(BINOUT)/haredoc' '$(DESTDIR)$(BINDIR)/haredoc'
+ 	for i in $(MAN1); do install -m644 docs/$$i.1 '$(DESTDIR)$(MANDIR)'/man1/$$i.1; done
+ 	for i in $(MAN5); do install -m644 docs/$$i.5 '$(DESTDIR)$(MANDIR)'/man5/$$i.5; done
+ 
+@@ -115,7 +113,6 @@ install-mods:
+ 
+ uninstall:
+ 	rm -- '$(DESTDIR)$(BINDIR)/hare'
+-	rm -- '$(DESTDIR)$(BINDIR)/haredoc'
+ 	for i in $(MAN1); do rm -- '$(DESTDIR)$(MANDIR)'/man1/$$i.1; done
+ 	for i in $(MAN5); do rm -- '$(DESTDIR)$(MANDIR)'/man5/$$i.5; done
+ 	rm -r -- '$(DESTDIR)$(STDLIB)'

pkgs/by-name/ha/hare/package.nix

@@ -9,6 +9,7 @@
 , scdoc
 , tzdata
 , substituteAll
+, fetchpatch
 , callPackage
 , enableCrossCompilation ? (stdenv.hostPlatform.isLinux && stdenv.hostPlatform.is64bit)
 , pkgsCross
@@ -32,6 +33,11 @@ in
 
 let
   arch = stdenv.hostPlatform.uname.processor;
+  qbePlatform = {
+    x86_64 = "amd64_sysv";
+    aarch64 = "arm64";
+    riscv64 = "rv64";
+  }.${arch};
   platform = lib.toLower stdenv.hostPlatform.uname.system;
   embeddedOnBinaryTools =
     let
@@ -74,6 +80,14 @@ stdenv.mkDerivation (finalAttrs: {
       src = ./001-tzdata.patch;
       inherit tzdata;
     })
+    # Use correct comment syntax for debug+riscv64.
+    (fetchpatch {
+      url = "https://git.sr.ht/~sircmpwn/hare/commit/80e45e4d931a6e90d999846b86471cac00d2a6d5.patch";
+      hash = "sha256-S7nXpiO0tYnKpmpj+fLkolGeHb1TrmgKlMF0+j0qLPQ=";
+    })
+    # Don't build haredoc since it uses the build `hare` bin, which breaks
+    # cross-compilation.
+    ./002-dont-build-haredoc.patch
   ];
 
   nativeBuildInputs = [
@@ -95,6 +109,10 @@ stdenv.mkDerivation (finalAttrs: {
     "PREFIX=${builtins.placeholder "out"}"
     "ARCH=${arch}"
     "VERSION=${finalAttrs.version}-nixpkgs"
+    "QBEFLAGS=-t${qbePlatform}"
+    "CC=${stdenv.cc.targetPrefix}cc"
+    "AS=${stdenv.cc.targetPrefix}as"
+    "LD=${stdenv.cc.targetPrefix}ld"
     # Strip the variable of an empty $(SRCDIR)/hare/third-party, since nix does
     # not follow the FHS.
     "HAREPATH=$(SRCDIR)/hare/stdlib"