Add support for building with clang-cl
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diff --git a/README b/README
index 7aee5b4..9cba257 100644
--- a/README
+++ b/README
@@ -146,12 +146,17 @@ It's also possible to build libffi on Windows platforms with
Microsoft's Visual C++ compiler. In this case, use the msvcc.sh
wrapper script during configuration like so:
-path/to/configure CC=path/to/msvcc.sh CXX=path/to/msvcc.sh LD=link CPP=\"cl -nologo -EP\"
+path/to/configure CC=path/to/msvcc.sh CXX=path/to/msvcc.sh LD=link CPP="cl -nologo -EP"
For 64-bit Windows builds, use CC="path/to/msvcc.sh -m64" and
CXX="path/to/msvcc.sh -m64". You may also need to specify --build
appropriately.
+It is also possible to build libffi on Windows platforms with the LLVM
+project's clang-cl compiler, like below:
+
+path/to/configure CC="path/to/msvcc.sh -clang-cl" CXX="path/to/msvcc.sh -clang-cl" LD=link CPP="clang-cl -EP"
+
When building with MSVC under a MingW environment, you may need to
remove the line in configure that sets 'fix_srcfile_path' to a 'cygpath'
command. ('cygpath' is not present in MingW, and is not required when
diff --git a/include/ffi.h.in b/include/ffi.h.in
index 70c6179..ebed0aa 100644
--- a/include/ffi.h.in
+++ b/include/ffi.h.in
@@ -68,7 +68,7 @@ extern "C" {
#ifndef LIBFFI_ASM
-#ifdef _MSC_VER
+#if defined(_MSC_VER) && !defined(__clang__)
#define __attribute__(X)
#endif
diff --git a/msvcc.sh b/msvcc.sh
index 9208076..4a65b0b 100755
--- a/msvcc.sh
+++ b/msvcc.sh
@@ -63,11 +63,15 @@ do
shift 1
;;
-m64)
- cl="cl" # "$MSVC/x86_amd64/cl"
ml="ml64" # "$MSVC/x86_amd64/ml64"
safeseh=
shift 1
;;
+ -clang-cl)
+ cl="clang-cl"
+ safeseh=
+ shift 1
+ ;;
-O0)
args="$args -Od"
shift 1