Add basic Webassembly support via Emscripten.

4 files changed, 62 insertions, 1 deletions

diff --git a/mesonbuild/compilers/__init__.py b/mesonbuild/compilers/__init__.py
index 6d9e814..5cd56b8 100644
--- a/mesonbuild/compilers/__init__.py
+++ b/mesonbuild/compilers/__init__.py
@@ -126,6 +126,7 @@ from .c import (
     ClangClCCompiler,
     GnuCCompiler,
     ElbrusCCompiler,
+    EmscriptenCCompiler,
     IntelCCompiler,
     IntelClCCompiler,
     PGICCompiler,
@@ -140,6 +141,7 @@ from .cpp import (
     ClangClCPPCompiler,
     GnuCPPCompiler,
     ElbrusCPPCompiler,
+    EmscriptenCPPCompiler,
     IntelCPPCompiler,
     IntelClCPPCompiler,
     PGICPPCompiler,
diff --git a/mesonbuild/compilers/c.py b/mesonbuild/compilers/c.py
index eff7161..f50b77c 100644
--- a/mesonbuild/compilers/c.py
+++ b/mesonbuild/compilers/c.py
@@ -119,6 +119,31 @@ class ClangCCompiler(ClangCompiler, CCompiler):
         return basic
 
 
+class EmscriptenCCompiler(ClangCCompiler):
+    def __init__(self, exelist, version, compiler_type, for_machine: MachineChoice, is_cross, exe_wrapper=None, **kwargs):
+        if not is_cross:
+            raise MesonException('Emscripten compiler can only be used for cross compilation.')
+        ClangCCompiler.__init__(self, exelist, version, compiler_type, for_machine, is_cross, exe_wrapper, **kwargs)
+        self.id = 'emscripten'
+
+    def get_option_link_args(self, options):
+        return []
+
+    def get_linker_always_args(self):
+        return []
+
+    def get_asneeded_args(self):
+        return []
+
+    def get_lundef_args(self):
+        return []
+
+    def build_rpath_args(self, *args, **kwargs):
+        return []
+
+    def get_soname_args(self, *args, **kwargs):
+        raise MesonException('Emscripten does not support shared libraries.')
+
 class ArmclangCCompiler(ArmclangCompiler, CCompiler):
     def __init__(self, exelist, version, compiler_type, for_machine: MachineChoice, is_cross, exe_wrapper=None, **kwargs):
         CCompiler.__init__(self, exelist, version, for_machine, is_cross, exe_wrapper, **kwargs)
diff --git a/mesonbuild/compilers/compilers.py b/mesonbuild/compilers/compilers.py
index 179756a..5249068 100644
--- a/mesonbuild/compilers/compilers.py
+++ b/mesonbuild/compilers/compilers.py
@@ -1204,6 +1204,7 @@ class CompilerType(enum.Enum):
     CLANG_STANDARD = 10
     CLANG_OSX = 11
     CLANG_MINGW = 12
+    CLANG_EMSCRIPTEN = 13
     # Possibly clang-cl?
 
     ICC_STANDARD = 20
diff --git a/mesonbuild/compilers/cpp.py b/mesonbuild/compilers/cpp.py
index 6ae2673..5808b2e 100644
--- a/mesonbuild/compilers/cpp.py
+++ b/mesonbuild/compilers/cpp.py
@@ -131,7 +131,7 @@ class CPPCompiler(CLikeCompiler, Compiler):
         }
 
         # Currently, remapping is only supported for Clang, Elbrus and GCC
-        assert(self.id in frozenset(['clang', 'lcc', 'gcc']))
+        assert(self.id in frozenset(['clang', 'lcc', 'gcc', 'emscripten']))
 
         if cpp_std not in CPP_FALLBACKS:
             # 'c++03' and 'c++98' don't have fallback types
@@ -183,6 +183,39 @@ class ClangCPPCompiler(ClangCompiler, CPPCompiler):
         return ['-lstdc++']
 
 
+class EmscriptenCPPCompiler(ClangCPPCompiler):
+    def __init__(self, exelist, version, compiler_type, for_machine: MachineChoice, is_cross, exe_wrapper=None, **kwargs):
+        if not is_cross:
+            raise MesonException('Emscripten compiler can only be used for cross compilation.')
+        ClangCPPCompiler.__init__(self, exelist, version, compiler_type, for_machine, is_cross, exe_wrapper, **kwargs)
+        self.id = 'emscripten'
+
+    def get_option_compile_args(self, options):
+        args = []
+        std = options['cpp_std']
+        if std.value != 'none':
+            args.append(self._find_best_cpp_std(std.value))
+        return args
+
+    def get_option_link_args(self, options):
+        return []
+
+    def get_linker_always_args(self):
+        return []
+
+    def get_asneeded_args(self):
+        return []
+
+    def get_lundef_args(self):
+        return []
+
+    def build_rpath_args(self, *args, **kwargs):
+        return []
+
+    def get_soname_args(self, *args, **kwargs):
+        raise MesonException('Emscripten does not support shared libraries.')
+
+
 class ArmclangCPPCompiler(ArmclangCompiler, CPPCompiler):
     def __init__(self, exelist, version, compiler_type, for_machine: MachineChoice, is_cross, exe_wrapper=None, **kwargs):
         CPPCompiler.__init__(self, exelist, version, for_machine, is_cross, exe_wrapper, **kwargs)