SERVER-40943 Define a variables file to build with brew llvm and the remote v3 clang

4 files changed, 36 insertions, 3 deletions

diff --git a/etc/scons/icecream_homebrew_macosx.vars b/etc/scons/icecream_homebrew_macosx.vars
new file mode 100644
index 00000000000..0ba7164a456
--- /dev/null
+++ b/etc/scons/icecream_homebrew_macosx.vars
@@ -0,0 +1,28 @@
+# Configures the build to use Toolchain Clang to build with icecream
+# cross compiling for macOS, using homebrew for local and the MongoDB
+# toolchain for remote. You will need brew's llvm@7 installed.
+
+import os
+import subprocess
+import SCons.Defaults
+
+exec(open('etc/scons/xcode_macosx.vars', "rb").read())
+
+# TODO: When we bump the toolchain, these need to move to an equivalent
+# LLVM version. Currently, the stable MongoDB toolchain (v3) uses clang 7.
+CC = "/usr/local/opt/llvm@7/bin/clang"
+CXX = "/usr/local/opt/llvm@7/bin/clang++"
+
+for tool in [CC, CXX]:
+    try:
+        result = subprocess.check_output([tool, '--version']).decode('utf-8').strip()
+    except subprocess.CalledProcessError as e:
+        print('Failed while invoking toolchain binary ' + CXX + ': ' + str(e.output))
+        print('Please ensure that the homebrew llvm@7 package is correctly installed')
+        SCons.Script.Exit(-1)
+    except OSError as e:
+        print('Failed to invoke toolchain binary ' + CXX + ': ' + str(e))
+        print('Please install the homebrew llvm@7 package')
+        SCons.Script.Exit(-1)
+
+exec(open('etc/scons/icecream_remote_mongodbtoolchain.vars', "rb").read())
diff --git a/etc/scons/icecream_macosx_via_linux_cross.vars b/etc/scons/icecream_remote_mongodbtoolchain.vars
index b8f3e75f979..b8f3e75f979 100644
--- a/etc/scons/icecream_macosx_via_linux_cross.vars
+++ b/etc/scons/icecream_remote_mongodbtoolchain.vars
diff --git a/etc/scons/icecream_xcode_macosx.vars b/etc/scons/icecream_xcode_macosx.vars
index 1d0060a01f3..dc8237b416b 100644
--- a/etc/scons/icecream_xcode_macosx.vars
+++ b/etc/scons/icecream_xcode_macosx.vars
@@ -1,4 +1,9 @@
 # Configures the build to use Toolchain Clang to build with icecream
-# cross compiling for macOS
+# cross compiling for macOS, using Xcode for local and the MongoDB
+# toolchain for remote. This will only work if your Xcode version
+# closely matches the mongodbtoolchain version w.r.t. clang. Currently
+# the MongoDB toolchain v3 uses clang-7, so this would only work with
+# XCode 10.
+
 exec(open('etc/scons/xcode_macosx.vars', "rb").read())
-exec(open('etc/scons/icecream_macosx_via_linux_cross.vars', "rb").read())
+exec(open('etc/scons/icecream_remote_mongodbtoolchain.vars', "rb").read())
diff --git a/etc/scons/mongodbtoolchain_v3_gcc.vars b/etc/scons/mongodbtoolchain_v3_gcc.vars
index 784d981568e..f4d08f688ef 100644
--- a/etc/scons/mongodbtoolchain_v3_gcc.vars
+++ b/etc/scons/mongodbtoolchain_v3_gcc.vars
@@ -33,7 +33,7 @@ try:
    AS = subprocess.check_output([CXX, '-print-prog-name=as']).decode('utf-8').strip()
    OBJCOPY = subprocess.check_output([CXX, '-print-prog-name=objcopy']).decode('utf-8').strip()
 except subprocess.CalledProcessError as e:
-   print('Failed while invoking toolchain binary ' + CXX + ': ' + e.output)
+   print('Failed while invoking toolchain binary ' + CXX + ': ' + str(e.output))
    SCons.Script.Exit(-1)
 except OSError as e:
    print('Failed to invoke toolchain binary ' + CXX + ': ' + str(e))