Switch boost to the overlay convention

.orchestra/config/components.yml

@@ -15,7 +15,6 @@
 #@ load("/components/glibc.lib.yml", "glibc_component")
 #@ load("/components/libffi.lib.yml", "libffi_component")
 #@ load("/components/qemu.lib.yml", "qemu_component")
-#@ load("/components/boost.lib.yml", "boost_component")
 #@ load("/components/revng.lib.yml", "revng_component")
 #@ load("/components/revng_c.lib.yml", "revng_c_component")
 #@ load("/components/caliban.lib.yml", "caliban_component")
@@ -71,7 +70,6 @@ components:
   glibc: #@ glibc_component
   libffi: #@ libffi_component
   qemu: #@ qemu_component
-  boost: #@ boost_component
   revng: #@ revng_component
   revng-c: #@ revng_c_component
   caliban: #@ caliban_component

.orchestra/config/components/boost.lib.yml

-#@ load("/global_options.lib.yml", "options")
-
-#@yaml/text-templated-strings
----
-#@ def _boost_component():
-builds:
-  default:
-    configure: |
-      mkdir -p "$BUILD_DIR"
-
-      extract.sh --into "$BUILD_DIR" "https://dl.bintray.com/boostorg/release/1.71.0/source/boost_1_71_0.tar.bz2"
-      patch-if-exists "${PATCH_DIR}/boost-1.63.0-icl-disable-LessThanComparableConcept.patch" "$BUILD_DIR"
-      cd "$BUILD_DIR" && ./bootstrap.sh --prefix="$ORCHESTRA_ROOT" --with-libraries=test
-    install: |
-      cd "$BUILD_DIR"
-      export ORIGIN='$ORIGIN'
-      ./b2 \
-        --prefix="${DESTDIR}${ORCHESTRA_ROOT}" \
-        --ignore-site-config toolset='clang' \
-        cxxflags='(@= options["use_old_glibc_cflags"] @) (@= options["regular_cxx_flags"] @)' \
-        linkflags='(@= options["use_old_glibc_lflags"] @) (@= options["regular_linker_flags"] @) -Wl,-rpath=$ORIGIN/../lib'
-      ./b2 \
-        --prefix="${DESTDIR}${ORCHESTRA_ROOT}" \
-        --ignore-site-config toolset='clang' \
-        cxxflags='(@= options["regular_cxx_flags"] @)' \
-        linkflags='(@= options["regular_linker_flags"] @) -Wl,-rpath=$ORIGIN/../lib' \
-        install
-    dependencies:
-      - clang-release
-      - toolchain/host/gcc
-      - libunwind
-#@ end
-
----
-#@ boost_component = _boost_component()

.orchestra/config/components/boost.yml

+#@ load("@ytt:template", "template")
+#@ load("@ytt:overlay", "overlay")
+
+#@ load("/lib/create_component.lib.yml", "single_build_component")
+
+#@ load("/global_options.lib.yml", "options")
+
+#@ def _boost():
+configure: |
+  mkdir -p "$BUILD_DIR"
+
+  extract.sh --into "$BUILD_DIR" "https://dl.bintray.com/boostorg/release/1.71.0/source/boost_1_71_0.tar.bz2"
+  patch-if-exists "${PATCH_DIR}/boost-1.63.0-icl-disable-LessThanComparableConcept.patch" "$BUILD_DIR"
+  cd "$BUILD_DIR" && ./bootstrap.sh --prefix="$ORCHESTRA_ROOT" --with-libraries=test
+install: |
+  cd "$BUILD_DIR"
+  export ORIGIN='$ORIGIN'
+  ./b2 \
+    --prefix="${DESTDIR}${ORCHESTRA_ROOT}" \
+    --ignore-site-config toolset='clang' \
+    cxxflags='(@= options["use_old_glibc_cflags"] @) (@= options["regular_cxx_flags"] @)' \
+    linkflags='(@= options["use_old_glibc_lflags"] @) (@= options["regular_linker_flags"] @) -Wl,-rpath=$ORIGIN/../lib'
+  ./b2 \
+    --prefix="${DESTDIR}${ORCHESTRA_ROOT}" \
+    --ignore-site-config toolset='clang' \
+    cxxflags='(@= options["regular_cxx_flags"] @)' \
+    linkflags='(@= options["regular_linker_flags"] @) -Wl,-rpath=$ORIGIN/../lib' \
+    install
+dependencies:
+  - clang-release
+  - toolchain/host/gcc
+  - libunwind
+#@ end
+
+#@overlay/match by=overlay.all, expects=1
+#@overlay/match-child-defaults missing_ok=True
+#@yaml/text-templated-strings
+---
+components:
+  boost: #@ single_build_component(**_boost())

.orchestra/config/lib/create_component.lib.yml

@@ -15,8 +15,9 @@
 #@      build_dependencies=[],
 #@      repository=None,
 #@      add_to_path=[],
-#@      pre_install="",
-#@      post_install="",
+#@      install=None,
+#@      pre_install=None,
+#@      post_install=None,
 #@  ):
 
 #@ if/end repository:
@@ -33,17 +34,24 @@ builds:
     configure: #@ configure
 
     install: |
-      (@-= pre_install -@)
-      cd "$BUILD_DIR"
+      (@- if pre_install: @)
+      (@-= pre_install @)
+      (@ end -@)
       (@- if build_system == "make": @)
+      cd "$BUILD_DIR"
       (@= make @)
       (@= make @) install
       (@- elif build_system == "ninja": @)
+      cd "$BUILD_DIR"
       ninja install
-      (@ else: @)
-      (@ fail("build_system must be either make or ninja") @)
-      (@- end @)
+      (@- elif install: @)
+      (@-= install -@)
+      (@- else: @)
+      (@- fail("build_system must be either make or ninja or you must specify an install script") @)
+      (@- end -@)
+      (@- if post_install: -@)
       (@= post_install -@)
+      (@- end -@)
 #@ if/end add_to_path:
 add_to_path: #@ add_to_path
 #@ end