From bde561c4813952847112600e5efe72d9015556f7 Mon Sep 17 00:00:00 2001
From: John Ericson <John.Ericson@Obsidian.Systems>
Date: Tue, 14 Dec 2021 14:52:02 -0500
Subject: [compiler-rt][cmake] Factor out extend_install_path function

It is likely to become used again, if other projects want their own per-project
install directory variables. `install` is removed from the name since it is not inherently about installing.

Reviewed By: stephenneuendorffer

Differential Revision: https://reviews.llvm.org/D115746
---
 cmake/Modules/ExtendPath.cmake | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)
 create mode 100644 cmake/Modules/ExtendPath.cmake

(limited to 'cmake')

diff --git a/cmake/Modules/ExtendPath.cmake b/cmake/Modules/ExtendPath.cmake
new file mode 100644
index 000000000000..5db393a21e1c
--- /dev/null
+++ b/cmake/Modules/ExtendPath.cmake
@@ -0,0 +1,19 @@
+# Extend the path in `base_path` with the path in `current_segment`, returning
+# the result in `joined_path`. If `current_segment` is an absolute path then
+# just return it, in effect overriding `base_path`, and issue a warning.
+#
+# Note that the code returns a relative path (avoiding introducing leading
+# slashes) if `base_path` is empty.
+function(extend_path joined_path base_path current_segment)
+  if("${current_segment}" STREQUAL "")
+    set(temp_path "${base_path}")
+  elseif("${base_path}" STREQUAL "")
+    set(temp_path "${current_segment}")
+  elseif(IS_ABSOLUTE "${current_segment}")
+    message(WARNING "Since \"${current_segment}\" is absolute, it overrides install path: \"${base_path}\".")
+    set(temp_path "${current_segment}")
+  else()
+    set(temp_path "${base_path}/${current_segment}")
+  endif()
+  set(${joined_path} "${temp_path}" PARENT_SCOPE)
+endfunction()
-- 
cgit v1.2.1