Add comment about disabling crossgen command for cross build

As we all know, the current cross build generates exectuable
'crossgen' with arm architecture (without x86 architecture).
So, it can not be run to make mscorlib.ni.dll from mscorlib.dll
on X86-based build machine.
Let's add a comment why we have to skip crossgen command in
build_mscorlib() of build.sh in case of cross build for Linux/ARM.

Signed-off-by: Geunsik Lim <geunsik.lim@samsung.com>
Commit migrated from https://github.com/dotnet/coreclr/commit/af1b954466de2b931809434bf8ad4dc355dc3e98

diff --git a/src/coreclr/build.sh b/src/coreclr/build.sh
index a5723af..e98b026 100755 (executable)
--- a/src/coreclr/build.sh
+++ b/src/coreclr/build.sh
@@ -248,6 +248,8 @@ build_mscorlib()
         exit 1
     fi
 
+    # The cross build generates exectuable 'crossgen' with arm architecture (without x86).
+    # It can not be run to make mscorlib.ni.dll from mscorlib.dll on X86-based build machine.
     if [ $__CrossBuild != 1 ]; then
        if [ $__SkipCoreCLR == 0 -a -e $__BinDir/crossgen ]; then
            echo "Generating native image for mscorlib."