improve llvm cross-compilation

Author: waruqi

xmake/toolchains/llvm/check.lua

@@ -84,7 +84,7 @@ function main(toolchain)
     end
 
     -- find cross toolchain from external envirnoment
-    local cross_toolchain = find_cross_toolchain(sdkdir, {bindir = bindir, cross = cross})
+    local cross_toolchain = find_cross_toolchain(sdkdir, {bindir = bindir})
     if not cross_toolchain then
         -- find it from packages
         for _, package in ipairs(toolchain:packages()) do
@@ -98,7 +98,7 @@ function main(toolchain)
         end
     end
     if cross_toolchain then
-        toolchain:config_set("cross", cross_toolchain.cross)
+        toolchain:config_set("cross", cross)
         toolchain:config_set("bindir", cross_toolchain.bindir)
         toolchain:config_set("sdkdir", cross_toolchain.sdkdir)
         toolchain:configs_save()
@@ -116,3 +116,4 @@ function main(toolchain)
     end
     return cross_toolchain
 end
+

xmake/toolchains/llvm/xmake.lua

@@ -59,10 +59,6 @@ toolchain("llvm")
             end
             toolchain:add("ldflags", "-fuse-ld=lld")
             toolchain:add("shflags", "-fuse-ld=lld")
-        elseif toolchain:is_arch("x86_64", "x64") then
-            march = "-m64"
-        elseif toolchain:is_arch("i386", "x86") then
-            march = "-m32"
         elseif toolchain:is_plat("cross") then
             local sysroot
             local sdkdir = toolchain:sdkdir()
@@ -90,6 +86,10 @@ toolchain("llvm")
                 toolchain:add("ldflags", "--sysroot=" .. sysroot)
                 toolchain:add("shflags", "--sysroot=" .. sysroot)
             end
+        elseif toolchain:is_arch("x86_64", "x64") then
+            march = "-m64"
+        elseif toolchain:is_arch("i386", "x86") then
+            march = "-m32"
         end
         if march then
             toolchain:add("cxflags", march)
@@ -129,3 +129,4 @@ toolchain("llvm")
             toolchain:add("runenvs", "PATH", bindir)
         end
     end)
+