[ci][cxx][sdks] C++ support for SDKs. (#10701)

* [ci][cxx][sdks] C++ support for SDKs.

* Remove cplusplus support, only cxx.

* [cxx][sdks] Provide isinf and isnan.
https://jenkins.mono-project.com/job/test-mono-pull-request-amd64-osx-products-sdks-android-cxx/1/parsed_console/log.html

/Users/builder/jenkins/workspace/test-mono-pull-request-amd64-osx-products-sdks-android-cxx/mono/mini/jit-icalls.c:994:14: error: 'isinf' was not declared in this scope
  if (isinf (v) || isnan (v))

/Users/builder/jenkins/workspace/test-mono-pull-request-amd64-osx-products-sdks-android-cxx/mono/mini/jit-icalls.c:994:27: error: 'isnan' was not declared in this scope
  if (isinf (v) || isnan (v))

* Change target card mask from gpointer to mgreg_t.
Consider in future target_gsize instead, though if registers are larger than pointers (x32, arm64_32), ok.

Change inst_imm from mgreg_t to target_mgreg_t.

https://jenkins.mono-project.com/job/test-mono-pull-request-wasm-cxx/1/parsed_console/log.html

/mnt/jenkins/workspace/test-mono-pull-request-wasm-cxx/mono/mini/mini-runtime.c:3657:24: error: cast from 'gpointer {aka void*}' to 'mgreg_t {aka int}' loses precision [-fpermissive]
   g_assert ((((mgreg_t)arg) & 1) == 0);
                        ^                                            ^~~~
/mnt/jenkins/workspace/test-mono-pull-request-wasm-cxx/mono/mini/mini-runtime.c:3658:30: error: cast from 'gpointer {aka void*}' to 'mgreg_t {aka int}' loses precision [-fpermissive]
   arg = (gpointer)(((mgreg_t)arg) | 1);

In file included from /mnt/jenkins/workspace/test-mono-pull-request-wasm-cxx/mono/mini/method-to-ir.c:75:0:
/mnt/jenkins/workspace/test-mono-pull-request-wasm-cxx/mono/mini/method-to-ir.c: In function 'void mini_emit_write_barrier(MonoCompile*, MonoInst*, MonoInst*)':
/mnt/jenkins/workspace/test-mono-pull-request-wasm-cxx/mono/mini/ir-emit.h:703:39: error: cast from 'gpointer {aka void*}' to 'mgreg_t {aka int}' loses precision [-fpermissive]
         inst->inst_imm = (mgreg_t)(imm);  \
                                       ^
/mnt/jenkins/workspace/test-mono-pull-request-wasm-cxx/mono/mini/method-to-ir.c:2989:4: note: in expansion of macro 'MONO_EMIT_NEW_BIALU_IMM'
    MONO_EMIT_NEW_BIALU_IMM (cfg, OP_PAND_IMM, offset_reg, offset_reg, card_table_mask);
    ^~~~~~~~~~~~~~~~~~~~~~~

* [cxx][sdks] Move include out of extern "C" where it never belongs.

https://jenkins.mono-project.com/job/test-mono-pull-request-amd64-osx-products-sdks-android-cxx/4/parsed_console/log.html

  template<typename _Tp, typename _Up, typename _Vp,
   ^
/Users/builder/android-toolchain/mxe-b9cbb53/lib/gcc/x86_64-w64-mingw32.static/5.4.0/include/c++/ext/type_traits.h:205:3: error: template with C linkage
   template<typename _Tp, typename _Up, typename _Vp, typename _Wp,
   ^
In file included from /Users/builder/jenkins/workspace/test-mono-pull-request-amd64-osx-products-sdks-android-cxx/mono/utils/mono-compiler.h:31:0,
                 from /Users/builder/jenkins/workspace/test-mono-pull-request-amd64-osx-products-sdks-android-cxx/mono/utils/dlmalloc.h:33,
                 from /Users/builder/jenkins/workspace/test-mono-pull-request-amd64-osx-products-sdks-android-cxx/mono/utils/dlmalloc.c:27:
/Users/builder/android-toolchain/mxe-b9cbb53/lib/gcc/x86_64-w64-mingw32.static/5.4.0/include/c++/cmath: In function 'constexpr float std::abs(float)':
/Users/builder/android-toolchain/mxe-b9cbb53/lib/gcc/x86_64-w64-mingw32.static/5.4.0/include/c++/cmath:87:16: error: conflicting declaration of C function 'constexpr float std::abs(float)'
   abs(float __x)

* Expand cmath to wasm.

https://jenkins.mono-project.com/job/test-mono-pull-request-wasm-cxx/5/parsed_console/log.html

/mnt/jenkins/workspace/test-mono-pull-request-wasm-cxx/mono/mini/mini-llvm.c:4189:6: error: 'isnan' was not declared in this scope
  if (isnan (val))
      ^~~~~

* Provide cmath std::isnan for WebAssembly C++.

* Provide cmath std::isfinite for Android C++.

* Add cmath std::isunordered for Android

/Users/builder/jenkins/workspace/test-mono-pull-request-amd64-osx-products-sdks-android-cxx/mono/mini/interp/interp.c:3282:14: error: use of undeclared identifier 'isunordered'; did you mean 'std::isunordered'?
                        CONDBR_S(!isunordered (sp [0].data.f, sp [1].data.f) && sp[0].data.f <= sp[1].data.f)
                                  ^~~~~~~~~~~
                                  std::isunordered

* Add cmath std::isinf for Android.

https://jenkins.mono-project.com/job/test-mono-pull-request-amd64-osx-products-sdks-android-cxx/10/parsed_console/log.html

/Users/builder/jenkins/workspace/test-mono-pull-request-amd64-osx-products-sdks-android-cxx/mono/mini/interp/interp.c:3751:8: error: use of undeclared identifier 'isinf'
                        if (isinf (sp [-1].data.f))

* "using std::isinf" sometimes breaks on Android, sometimes fixes Android,
because Android sometimes has global isinf.

/Users/builder/jenkins/workspace/test-mono-pull-request-amd64-osx-products-sdks-android-cxx/mono/mini/interp/interp.c:92:12: error: target of using declaration conflicts with declaration already in scope
using std::isinf;
           ^
/Users/builder/android-toolchain/toolchains/arm64-v8a-clang/bin/../lib/gcc/aarch64-linux-android/4.9.x/../../../../include/c++/4.9.x/cmath:604:3: note: target of using declaration
  isinf(double __x)
  ^
/Users/builder/android-toolchain/toolchains/arm64-v8a-clang/bin/../sysroot/usr/include/math.h:234:6: note: conflicting declaration
int     (isinf)(double) __pure2;

There are still some errors in new lanes (WebAssembly works, Android does not, iOS not sure), to be addressed shortly, possibly by redoing some of the cmath stuff.

1 files changed, 2 insertions, 0 deletions

diff --git a/sdks/builds/runtime.mk b/sdks/builds/runtime.mk
index fa63d9cf002..73b67a94d10 100644
--- a/sdks/builds/runtime.mk
+++ b/sdks/builds/runtime.mk
@@ -64,6 +64,7 @@ _runtime_$(1)_CONFIGURE_ENVIRONMENT = \
 	$$($(1)_CONFIGURE_ENVIRONMENT)
 
 _runtime_$(1)_CONFIGURE_FLAGS= \
+	$(if $(ENABLE_CXX),--enable-cxx) \
 	$$(if $(2),--host=$(2)) \
 	--cache-file=$$(TOP)/sdks/builds/$(1)-$$(CONFIGURATION).config.cache \
 	--prefix=$$(TOP)/sdks/out/$(1)-$$(CONFIGURATION) \
@@ -143,6 +144,7 @@ $(TOP)/tools/offsets-tool/MonoAotOffsetsDumper.exe: $(wildcard $(TOP)/tools/offs
 define CrossRuntimeTemplate
 
 _cross-runtime_$(1)_CONFIGURE_FLAGS= \
+	$(if $(ENABLE_CXX),--enable-cxx) \
 	--target=$(3) \
 	--with-cross-offsets=$(3).h \
 	--with-llvm=$$(TOP)/sdks/out/$(5)