improve clang-cl envs

1 files changed, 12 insertions, 3 deletions

diff --git a/xmake/toolchains/clang-cl/load.lua b/xmake/toolchains/clang-cl/load.lua
index 3b0da0e0a..3763b8d2e 100644
--- a/xmake/toolchains/clang-cl/load.lua
+++ b/xmake/toolchains/clang-cl/load.lua
@@ -24,7 +24,7 @@ import("core.project.config")
 import("detect.sdks.find_vstudio")
 
 -- add the given vs environment
-function _add_vsenv(toolchain, name)
+function _add_vsenv(toolchain, name, curenvs)
 
     -- get vcvars
     local vcvars = toolchain:config("vcvars")
@@ -35,6 +35,14 @@ function _add_vsenv(toolchain, name)
     -- get the paths for the vs environment
     local new = vcvars[name]
     if new then
+        -- fix case naming conflict for cmake/msbuild between the new msvc envs and current environment, if we are running xmake in vs prompt.
+        -- @see https://github.com/xmake-io/xmake/issues/4751
+        for k, c in pairs(curenvs) do
+            if name:lower() == k:lower() and name ~= k then
+                name = k
+                break
+            end
+        end
         toolchain:add("runenvs", name, table.unwrap(path.splitenv(new)))
     end
 end
@@ -57,12 +65,13 @@ function main(toolchain)
 
     -- add vs environments
     local expect_vars = {"PATH", "LIB", "INCLUDE", "LIBPATH"}
+    local curenvs = os.getenvs()
     for _, name in ipairs(expect_vars) do
-        _add_vsenv(toolchain, name)
+        _add_vsenv(toolchain, name, curenvs)
     end
     for _, name in ipairs(find_vstudio.get_vcvars()) do
         if not table.contains(expect_vars, name:upper()) then
-            _add_vsenv(toolchain, name)
+            _add_vsenv(toolchain, name, curenvs)
         end
     end