From d4673a2ff058529488dddf2e0520ee68ec88a0c7 Mon Sep 17 00:00:00 2001
From: Egor Tensin <Egor.Tensin@gmail.com>
Date: Mon, 25 Jan 2021 16:05:51 +0300
Subject: project.ci: use pre-built Boost when available

---
 project/ci/appveyor/generator.py | 13 +++++++++++++
 project/ci/cmake.py              | 11 ++++++++++-
 project/ci/dirs.py               | 22 ++++++++++++++++++++++
 3 files changed, 45 insertions(+), 1 deletion(-)

diff --git a/project/ci/appveyor/generator.py b/project/ci/appveyor/generator.py
index 19c11df..454bd4a 100644
--- a/project/ci/appveyor/generator.py
+++ b/project/ci/appveyor/generator.py
@@ -28,6 +28,19 @@ class Image(Enum):
     def get():
         return Image.parse(env('APPVEYOR_BUILD_WORKER_IMAGE'))
 
+    def get_prebuilt_boost_dir(self):
+        # As of 2021-01-25, these are the latest pre-built Boost distributions:
+        # https://www.appveyor.com/docs/windows-images-software/#boost
+        if self is Image.VS_2013:
+            return 'C:\\Libraries\\boost_1_58_0'
+        if self is Image.VS_2015:
+            return 'C:\\Libraries\\boost_1_69_0'
+        if self is Image.VS_2017:
+            return 'C:\\Libraries\\boost_1_69_0'
+        if self is Image.VS_2019:
+            return 'C:\\Libraries\\boost_1_73_0'
+        raise NotImplementedError(f'unsupported AppVeyor image: {self}')
+
 
 class Generator(Enum):
     VS_2013 = 'Visual Studio 12 2013'
diff --git a/project/ci/cmake.py b/project/ci/cmake.py
index 6635dbf..70fd885 100644
--- a/project/ci/cmake.py
+++ b/project/ci/cmake.py
@@ -43,12 +43,21 @@ def build_ci(dirs, argv=None):
         src_dir = os.path.join(src_dir, args.subdir)
     install_dir = dirs.get_install_dir() if args.install else None
 
+    boost_dir = args.boost_dir
+    if not boost_dir:
+        # If we've built Boost using project.ci.boost already, use that.
+        # Otherwise, try to use the latest pre-built Boost provided by the CI
+        # system.
+        boost_dir = dirs.get_boost_dir()
+        if not os.path.isdir(boost_dir):
+            boost_dir = dirs.get_prebuilt_boost_dir()
+
     params = BuildParameters(src_dir,
                              build_dir=dirs.get_cmake_dir(),
                              install_dir=install_dir,
                              platform=dirs.get_platform(),
                              configuration=dirs.get_configuration(),
-                             boost_dir=args.boost_dir or dirs.get_boost_dir(),
+                             boost_dir=boost_dir,
                              toolset=dirs.get_toolset(),
                              cmake_args=dirs.get_cmake_args() + args.cmake_args)
     build(params)
diff --git a/project/ci/dirs.py b/project/ci/dirs.py
index 33bd667..946a315 100644
--- a/project/ci/dirs.py
+++ b/project/ci/dirs.py
@@ -10,6 +10,7 @@ import os.path
 from project.boost.version import Version
 from project.ci.appveyor.generator import Generator, Image
 from project.configuration import Configuration
+import project.os
 from project.platform import Platform
 from project.toolchain import ToolchainType
 from project.utils import env
@@ -59,6 +60,10 @@ class Dirs(abc.ABC):
     def get_build_dir(self):
         pass
 
+    @abc.abstractmethod
+    def get_prebuilt_boost_dir(self):
+        pass
+
     def get_boost_version(self):
         return Version.from_string(env('boost_version'))
 
@@ -118,6 +123,11 @@ class Travis(Dirs):
     def get_build_dir(self):
         return env('HOME')
 
+    def get_prebuilt_boost_dir(self):
+        # Travis doesn't have pre-built Boost (available for installation from
+        # the official Ubuntu repositories though).
+        return None
+
     def get_cmake_args(self):
         return []
 
@@ -142,6 +152,9 @@ class AppVeyor(Dirs):
     def get_build_dir(self):
         return R'C:\projects'
 
+    def get_prebuilt_boost_dir(self):
+        return Image.get().get_prebuilt_boost_dir()
+
     def get_cmake_args(self):
         return ['-G', str(Generator.from_image(Image.get()))]
 
@@ -166,6 +179,15 @@ class GitHub(Dirs):
     def get_build_dir(self):
         return os.path.dirname(env('GITHUB_WORKSPACE'))
 
+    def get_prebuilt_boost_dir(self):
+        # As of 2021-01-25, Boost 1.72.0 is pre-built (on all images except for
+        # ubuntu-20.04 for some reason).  The path is stored in environment
+        # variable BOOST_ROOT_1_72_0.
+        var_name = 'BOOST_ROOT_1_72_0'
+        if var_name in os.environ:
+            return os.environ[var_name]
+        return None
+
     def get_cmake_args(self):
         return []
 
-- 
cgit v1.2.3