Add 'third_party/nix/' from commit 'be66c7a6b24e3c3c6157fd37b86c7203d14acf10' r/724

git-subtree-dir: third_party/nix
git-subtree-mainline: cf8cd640c1adf74a3706efbcb0ea4625da106fb2
git-subtree-split: be66c7a6b24e3c3c6157fd37b86c7203d14acf10

1 files changed, 79 insertions, 0 deletions

diff --git a/third_party/nix/mk/programs.mk b/third_party/nix/mk/programs.mk
new file mode 100644
index 0000000000..d93df44680
--- /dev/null
+++ b/third_party/nix/mk/programs.mk
@@ -0,0 +1,79 @@
+programs-list :=
+
+# Build a program with symbolic name $(1).  The program is defined by
+# various variables prefixed by ‘$(1)_’:
+#
+# - $(1)_DIR: the directory where the (non-installed) program will be
+#   placed.
+#
+# - $(1)_SOURCES: the source files of the program.
+#
+# - $(1)_CFLAGS: additional C compiler flags.
+#
+# - $(1)_CXXFLAGS: additional C++ compiler flags.
+#
+# - $(1)_ORDER_AFTER: a set of targets on which the object files of
+#   this program will have an order-only dependency.
+#
+# - $(1)_LIBS: the symbolic names of libraries on which this program
+#   depends.
+#
+# - $(1)_LDFLAGS: additional linker flags.
+#
+# - $(1)_INSTALL_DIR: the directory where the program will be
+#   installed; defaults to $(bindir).
+define build-program
+  _d := $(buildprefix)$$($(1)_DIR)
+  _srcs := $$(sort $$(foreach src, $$($(1)_SOURCES), $$(src)))
+  $(1)_OBJS := $$(addprefix $(buildprefix), $$(addsuffix .o, $$(basename $$(_srcs))))
+  _libs := $$(foreach lib, $$($(1)_LIBS), $$($$(lib)_PATH))
+  $(1)_PATH := $$(_d)/$(1)
+
+  $$(eval $$(call create-dir, $$(_d)))
+
+  $$($(1)_PATH): $$($(1)_OBJS) $$(_libs) | $$(_d)/
+	$$(trace-ld) $(CXX) -o $$@ $$(LDFLAGS) $$(GLOBAL_LDFLAGS) $$($(1)_OBJS) $$($(1)_LDFLAGS) $$(foreach lib, $$($(1)_LIBS), $$($$(lib)_LDFLAGS_USE))
+
+  $(1)_INSTALL_DIR ?= $$(bindir)
+  $(1)_INSTALL_PATH := $$($(1)_INSTALL_DIR)/$(1)
+
+  $$(eval $$(call create-dir, $$($(1)_INSTALL_DIR)))
+
+  install: $(DESTDIR)$$($(1)_INSTALL_PATH)
+
+  ifeq ($(BUILD_SHARED_LIBS), 1)
+
+    _libs_final := $$(foreach lib, $$($(1)_LIBS), $$($$(lib)_INSTALL_PATH))
+
+    $(DESTDIR)$$($(1)_INSTALL_PATH): $$($(1)_OBJS) $$(_libs_final) | $(DESTDIR)$$($(1)_INSTALL_DIR)/
+	$$(trace-ld) $(CXX) -o $$@ $$(LDFLAGS) $$(GLOBAL_LDFLAGS) $$($(1)_OBJS) $$($(1)_LDFLAGS) $$(foreach lib, $$($(1)_LIBS), $$($$(lib)_LDFLAGS_USE_INSTALLED))
+
+  else
+
+    $(DESTDIR)$$($(1)_INSTALL_PATH): $$($(1)_PATH) | $(DESTDIR)$$($(1)_INSTALL_DIR)/
+	install -t $(DESTDIR)$$($(1)_INSTALL_DIR) $$<
+
+  endif
+
+  # Propagate CFLAGS and CXXFLAGS to the individual object files.
+  $$(foreach obj, $$($(1)_OBJS), $$(eval $$(obj)_CFLAGS=$$($(1)_CFLAGS)))
+  $$(foreach obj, $$($(1)_OBJS), $$(eval $$(obj)_CXXFLAGS=$$($(1)_CXXFLAGS)))
+
+  # Make each object file depend on the common dependencies.
+  $$(foreach obj, $$($(1)_OBJS), $$(eval $$(obj): $$($(1)_COMMON_DEPS) $$(GLOBAL_COMMON_DEPS)))
+
+  # Make each object file have order-only dependencies on the common
+  # order-only dependencies. This includes the order-only dependencies
+  # of libraries we're depending on.
+  $(1)_ORDER_AFTER_CLOSED = $$($(1)_ORDER_AFTER) $$(foreach lib, $$($(1)_LIBS), $$($$(lib)_ORDER_AFTER_CLOSED))
+
+  $$(foreach obj, $$($(1)_OBJS), $$(eval $$(obj): | $$($(1)_ORDER_AFTER_CLOSED) $$(GLOBAL_ORDER_AFTER)))
+
+  # Include .dep files, if they exist.
+  $(1)_DEPS := $$(foreach fn, $$($(1)_OBJS), $$(call filename-to-dep, $$(fn)))
+  -include $$($(1)_DEPS)
+
+  programs-list += $$($(1)_PATH)
+  clean-files += $$($(1)_PATH) $$(_d)/*.o $$(_d)/.*.dep $$($(1)_DEPS) $$($(1)_OBJS)
+  dist-files += $$(_srcs)
+endef