project: Keep leading `0` in PROJECT_VERSION components

Introduce CMake policy `CMP0096` to make `project()` keep leading zeros
in version components.  As a side effect, it now allows really long
version numbers.

Fixes: #19421
Co-Author: Brad King <brad.king@kitware.com>

8 files changed, 95 insertions, 0 deletions

diff --git a/Tests/RunCMake/project/CMP0096-NEW-stdout.txt b/Tests/RunCMake/project/CMP0096-NEW-stdout.txt
new file mode 100644
index 0000000..f6b999a
--- /dev/null
+++ b/Tests/RunCMake/project/CMP0096-NEW-stdout.txt
@@ -0,0 +1,30 @@
+-- PROJECT_VERSION='2019.07.06'
+-- DateVersion_VERSION='2019.07.06'
+-- PROJECT_VERSION_MAJOR='2019'
+-- DateVersion_VERSION_MAJOR='2019'
+-- PROJECT_VERSION_MINOR='07'
+-- DateVersion_VERSION_MINOR='07'
+-- PROJECT_VERSION_PATCH='06'
+-- DateVersion_VERSION_PATCH='06'
+-- PROJECT_VERSION_TWEAK=''
+-- DateVersion_VERSION_TWEAK=''
+-- PROJECT_VERSION='4294967297'
+-- LongVersion_VERSION='4294967297'
+-- PROJECT_VERSION_MAJOR='4294967297'
+-- LongVersion_VERSION_MAJOR='4294967297'
+-- PROJECT_VERSION_MINOR=''
+-- LongVersion_VERSION_MINOR=''
+-- PROJECT_VERSION_PATCH=''
+-- LongVersion_VERSION_PATCH=''
+-- PROJECT_VERSION_TWEAK=''
+-- LongVersion_VERSION_TWEAK=''
+-- PROJECT_VERSION='0009999999999.0009999999999.0009999999999.0009999999999'
+-- VeryLongVersion_VERSION='0009999999999.0009999999999.0009999999999.0009999999999'
+-- PROJECT_VERSION_MAJOR='0009999999999'
+-- VeryLongVersion_VERSION_MAJOR='0009999999999'
+-- PROJECT_VERSION_MINOR='0009999999999'
+-- VeryLongVersion_VERSION_MINOR='0009999999999'
+-- PROJECT_VERSION_PATCH='0009999999999'
+-- VeryLongVersion_VERSION_PATCH='0009999999999'
+-- PROJECT_VERSION_TWEAK='0009999999999'
+-- VeryLongVersion_VERSION_TWEAK='0009999999999'
diff --git a/Tests/RunCMake/project/CMP0096-NEW.cmake b/Tests/RunCMake/project/CMP0096-NEW.cmake
new file mode 100644
index 0000000..e2cdd20
--- /dev/null
+++ b/Tests/RunCMake/project/CMP0096-NEW.cmake
@@ -0,0 +1,6 @@
+cmake_policy(SET CMP0048 NEW)
+cmake_policy(SET CMP0096 NEW)
+include(CMP0096-common.cmake)
+
+project(VeryLongVersion VERSION 0009999999999.0009999999999.0009999999999.0009999999999 LANGUAGES NONE)
+print_versions(VeryLongVersion)
diff --git a/Tests/RunCMake/project/CMP0096-OLD-stdout.txt b/Tests/RunCMake/project/CMP0096-OLD-stdout.txt
new file mode 100644
index 0000000..6a945ce
--- /dev/null
+++ b/Tests/RunCMake/project/CMP0096-OLD-stdout.txt
@@ -0,0 +1,20 @@
+-- PROJECT_VERSION='2019.7.6'
+-- DateVersion_VERSION='2019.7.6'
+-- PROJECT_VERSION_MAJOR='2019'
+-- DateVersion_VERSION_MAJOR='2019'
+-- PROJECT_VERSION_MINOR='7'
+-- DateVersion_VERSION_MINOR='7'
+-- PROJECT_VERSION_PATCH='6'
+-- DateVersion_VERSION_PATCH='6'
+-- PROJECT_VERSION_TWEAK=''
+-- DateVersion_VERSION_TWEAK=''
+-- PROJECT_VERSION='(1|4294967295)'
+-- LongVersion_VERSION='(1|4294967295)'
+-- PROJECT_VERSION_MAJOR='(1|4294967295)'
+-- LongVersion_VERSION_MAJOR='(1|4294967295)'
+-- PROJECT_VERSION_MINOR=''
+-- LongVersion_VERSION_MINOR=''
+-- PROJECT_VERSION_PATCH=''
+-- LongVersion_VERSION_PATCH=''
+-- PROJECT_VERSION_TWEAK=''
+-- LongVersion_VERSION_TWEAK=''
diff --git a/Tests/RunCMake/project/CMP0096-OLD.cmake b/Tests/RunCMake/project/CMP0096-OLD.cmake
new file mode 100644
index 0000000..25a3b19
--- /dev/null
+++ b/Tests/RunCMake/project/CMP0096-OLD.cmake
@@ -0,0 +1,3 @@
+cmake_policy(SET CMP0048 NEW)
+cmake_policy(SET CMP0096 OLD)
+include(CMP0096-common.cmake)
diff --git a/Tests/RunCMake/project/CMP0096-WARN-stdout.txt b/Tests/RunCMake/project/CMP0096-WARN-stdout.txt
new file mode 100644
index 0000000..6a945ce
--- /dev/null
+++ b/Tests/RunCMake/project/CMP0096-WARN-stdout.txt
@@ -0,0 +1,20 @@
+-- PROJECT_VERSION='2019.7.6'
+-- DateVersion_VERSION='2019.7.6'
+-- PROJECT_VERSION_MAJOR='2019'
+-- DateVersion_VERSION_MAJOR='2019'
+-- PROJECT_VERSION_MINOR='7'
+-- DateVersion_VERSION_MINOR='7'
+-- PROJECT_VERSION_PATCH='6'
+-- DateVersion_VERSION_PATCH='6'
+-- PROJECT_VERSION_TWEAK=''
+-- DateVersion_VERSION_TWEAK=''
+-- PROJECT_VERSION='(1|4294967295)'
+-- LongVersion_VERSION='(1|4294967295)'
+-- PROJECT_VERSION_MAJOR='(1|4294967295)'
+-- LongVersion_VERSION_MAJOR='(1|4294967295)'
+-- PROJECT_VERSION_MINOR=''
+-- LongVersion_VERSION_MINOR=''
+-- PROJECT_VERSION_PATCH=''
+-- LongVersion_VERSION_PATCH=''
+-- PROJECT_VERSION_TWEAK=''
+-- LongVersion_VERSION_TWEAK=''
diff --git a/Tests/RunCMake/project/CMP0096-WARN.cmake b/Tests/RunCMake/project/CMP0096-WARN.cmake
new file mode 100644
index 0000000..7fe0861
--- /dev/null
+++ b/Tests/RunCMake/project/CMP0096-WARN.cmake
@@ -0,0 +1,3 @@
+cmake_policy(SET CMP0048 NEW)
+
+include(CMP0096-common.cmake)
diff --git a/Tests/RunCMake/project/CMP0096-common.cmake b/Tests/RunCMake/project/CMP0096-common.cmake
new file mode 100644
index 0000000..8d26d30
--- /dev/null
+++ b/Tests/RunCMake/project/CMP0096-common.cmake
@@ -0,0 +1,9 @@
+include(PrintVersions.cmake)
+
+# Test leading zeros motivating this policy.
+project(DateVersion VERSION 2019.07.06 LANGUAGES NONE)
+print_versions(DateVersion)
+
+# Overflow version component in OLD behavior.
+project(LongVersion VERSION 4294967297 #[[ uint32_max + 2 ]] LANGUAGES NONE)
+print_versions(LongVersion)
diff --git a/Tests/RunCMake/project/RunCMakeTest.cmake b/Tests/RunCMake/project/RunCMakeTest.cmake
index 3a8ad4b..8f43a51 100644
--- a/Tests/RunCMake/project/RunCMakeTest.cmake
+++ b/Tests/RunCMake/project/RunCMakeTest.cmake
@@ -27,3 +27,7 @@ run_cmake(CMP0048-OLD)
 run_cmake(CMP0048-OLD-VERSION)
 run_cmake(CMP0048-WARN)
 run_cmake(CMP0048-NEW)
+
+run_cmake(CMP0096-WARN)
+run_cmake(CMP0096-OLD)
+run_cmake(CMP0096-NEW)