Allow using Xcode Command Line Tools to build Qt

Some users don't want to download the full Xcode installation which can
weigh upwards of 5 GB download and 20 GB installed.

[ChangeLog][macOS / iOS] Qt can now be built using just the Xcode
Command Line Tools, without needing to install the full Xcode IDE.

Task-number: QTBUG-35928
Task-number: QTBUG-41908
Change-Id: I6d13c9a03ab9087b3ab56e8547f53f0cc2806c7b
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Jake Petroules <jake.petroules@qt.io>

4 files changed, 30 insertions, 14 deletions

diff --git a/mkspecs/features/mac/default_post.prf b/mkspecs/features/mac/default_post.prf
index 395ac34001..e645ba5803 100644
--- a/mkspecs/features/mac/default_post.prf
+++ b/mkspecs/features/mac/default_post.prf
@@ -183,6 +183,7 @@ macx-xcode {
 }
 
 cache(QMAKE_XCODE_DEVELOPER_PATH, stash)
-cache(QMAKE_XCODE_VERSION, stash)
+!isEmpty(QMAKE_XCODE_VERSION): \
+    cache(QMAKE_XCODE_VERSION, stash)
 
 QMAKE_XCODE_LIBRARY_SUFFIX = $$qtPlatformTargetSuffix()
diff --git a/mkspecs/features/mac/default_pre.prf b/mkspecs/features/mac/default_pre.prf
index e21e749ee9..44636f2288 100644
--- a/mkspecs/features/mac/default_pre.prf
+++ b/mkspecs/features/mac/default_pre.prf
@@ -10,18 +10,23 @@ isEmpty(QMAKE_XCODE_DEVELOPER_PATH) {
     # Make sure Xcode path is valid
     !exists($$QMAKE_XCODE_DEVELOPER_PATH): \
         error("Xcode is not installed in $${QMAKE_XCODE_DEVELOPER_PATH}. Please use xcode-select to choose Xcode installation path.")
-
-    # Make sure Xcode is set up properly
-    isEmpty($$list($$system("/usr/bin/xcrun -find xcodebuild 2>/dev/null"))): \
-        error("Xcode not set up properly. You may need to confirm the license agreement by running /usr/bin/xcodebuild.")
 }
 
-isEmpty(QMAKE_XCODE_VERSION) {
-    # Extract Xcode version using xcodebuild
-    xcode_version = $$system("/usr/bin/xcodebuild -version")
-    QMAKE_XCODE_VERSION = $$member(xcode_version, 1)
-    isEmpty(QMAKE_XCODE_VERSION): error("Could not resolve Xcode version.")
-    unset(xcode_version)
+isEmpty(QMAKE_XCODEBUILD_PATH): \
+    QMAKE_XCODEBUILD_PATH = $$system("/usr/bin/xcrun -find xcodebuild 2>/dev/null")
+
+!isEmpty(QMAKE_XCODEBUILD_PATH) {
+    # Make sure Xcode is set up properly
+    !system("/usr/bin/xcrun xcodebuild -license check 2>/dev/null"): \
+        error("Xcode not set up properly. You need to confirm the license agreement by running 'sudo xcrun xcodebuild -license accept'.")
+
+    isEmpty(QMAKE_XCODE_VERSION) {
+        # Extract Xcode version using xcodebuild
+        xcode_version = $$system("/usr/bin/xcrun xcodebuild -version")
+        QMAKE_XCODE_VERSION = $$member(xcode_version, 1)
+        isEmpty(QMAKE_XCODE_VERSION): error("Could not resolve Xcode version.")
+        unset(xcode_version)
+    }
 }
 
 isEmpty(QMAKE_TARGET_BUNDLE_PREFIX) {
diff --git a/mkspecs/features/mac/sdk.prf b/mkspecs/features/mac/sdk.prf
index 68ab7e4053..3f6dc076ca 100644
--- a/mkspecs/features/mac/sdk.prf
+++ b/mkspecs/features/mac/sdk.prf
@@ -7,13 +7,22 @@ contains(QMAKE_MAC_SDK, .*/.*): \
 
 defineReplace(xcodeSDKInfo) {
     info = $$1
+    equals(info, "Path"): \
+        info = --show-sdk-path
+    equals(info, "PlatformPath"): \
+        info = --show-sdk-platform-path
+    equals(info, "SDKVersion"): \
+        info = --show-sdk-version
     sdk = $$2
     isEmpty(sdk): \
         sdk = $$QMAKE_MAC_SDK
 
     isEmpty(QMAKE_MAC_SDK.$${sdk}.$${info}) {
-        QMAKE_MAC_SDK.$${sdk}.$${info} = $$system("/usr/bin/xcodebuild -sdk $$sdk -version $$info 2>/dev/null")
-        isEmpty(QMAKE_MAC_SDK.$${sdk}.$${info}): error("Could not resolve SDK $$info for \'$$sdk\'")
+        QMAKE_MAC_SDK.$${sdk}.$${info} = $$system("/usr/bin/xcrun --sdk $$sdk $$info 2>/dev/null")
+        # --show-sdk-platform-path won't work for Command Line Tools; this is fine
+        # only used by the XCTest backend to testlib
+        isEmpty(QMAKE_MAC_SDK.$${sdk}.$${info}):if(!isEmpty(QMAKE_XCODEBUILD_PATH)|!equals(info, "--show-sdk-platform-path")): \
+            error("Could not resolve SDK $$info for \'$$sdk\'")
         cache(QMAKE_MAC_SDK.$${sdk}.$${info}, set stash, QMAKE_MAC_SDK.$${sdk}.$${info})
     }
 
diff --git a/mkspecs/features/xctest.prf b/mkspecs/features/xctest.prf
index 4b84682df7..4ee504f0ad 100644
--- a/mkspecs/features/xctest.prf
+++ b/mkspecs/features/xctest.prf
@@ -2,5 +2,6 @@ equals(TEMPLATE, app) {
     load(sdk)
     # Make the XCTest framework available. This is normally handled automatically
     # by Xcode based on heuristics, but we need to explicitly link to XCTest.
-    QMAKE_LFLAGS += -F$${QMAKE_MAC_SDK_PLATFORM_PATH}/Developer/Library/Frameworks -weak_framework XCTest
+    !isEmpty(QMAKE_MAC_SDK_PLATFORM_PATH): \
+        QMAKE_LFLAGS += -F$${QMAKE_MAC_SDK_PLATFORM_PATH}/Developer/Library/Frameworks -weak_framework XCTest
 }