not working -- look at nix emscripten support first before further work

lib/spack/env/cc

@@ -241,14 +241,14 @@ case "$command" in
         mode=cpp
         debug_flags="-g"
         ;;
-    cc|c89|c99|gcc|clang|armclang|icc|icx|pgcc|nvc|xlc|xlc_r|fcc|amdclang|cl.exe)
+    cc|c89|c99|gcc|clang|armclang|icc|icx|pgcc|nvc|xlc|xlc_r|fcc|amdclang|cl.exe|emcc)
         command="$SPACK_CC"
         language="C"
         comp="CC"
         lang_flags=C
         debug_flags="-g"
         ;;
-    c++|CC|g++|clang++|armclang++|icpc|icpx|dpcpp|pgc++|nvc++|xlc++|xlc++_r|FCC|amdclang++)
+    c++|CC|g++|clang++|armclang++|icpc|icpx|dpcpp|pgc++|nvc++|xlc++|xlc++_r|FCC|amdclang++|em++)
         command="$SPACK_CXX"
         language="C++"
         comp="CXX"

lib/spack/env/emscripten/em++

@@ -0,0 +1 @@
+../cc

lib/spack/env/emscripten/emcc

@@ -0,0 +1 @@
+../cc

lib/spack/spack/compilers/emscripten.py

@@ -15,8 +15,8 @@ class Emscripten(Compiler):
     cxx_names = ['em++']
 
     # Named wrapper links within build_env_path
-    link_paths = {'cc': os.path.join('upstream', 'emscripten', 'emcc'),
-                  'cxx': os.path.join('upstream', 'emscripten', 'em++'),
+    link_paths = {'cc': os.path.join('emscripten', 'emcc'),
+                  'cxx': os.path.join('emscripten', 'em++'),
                   'f77': '',
                   'fc': ''}
 
@@ -31,3 +31,7 @@ def debug_flags(self):
     @property
     def opt_flags(self):
         return ['-O0', '-O1', '-O2', '-O3', '-Os', '-Oz']
+
+    @property
+    def disable_new_dtags(self):
+        return ''

var/spack/repos/builtin/packages/alsa-lib/package.py

@@ -21,6 +21,8 @@ class AlsaLib(AutotoolsPackage):
     variant('python', default=False, description='enable python')
 
     patch('python.patch', when='@1.1.4:1.1.5 +python')
+    # Remove a type that only exists in the kernel.
+    patch('s64.patch')
 
     depends_on('python', type=('link', 'run'), when='+python')
 

var/spack/repos/builtin/packages/alsa-lib/s64.patch

@@ -0,0 +1,12 @@
+diff --git a/include/alsa/sound/uapi/asound.h b/include/alsa/sound/uapi/asound.h
+index ec610c2..5f9724b 100644
+--- a/include/alsa/sound/uapi/asound.h
++++ b/include/alsa/sound/uapi/asound.h2
+@@ -30,6 +30,7 @@
+ #else
+ #include <endian.h>
+ #include <sys/ioctl.h>
+ #endif
++typedef int64_t __s64;
+ 
+ #include <stdlib.h>

var/spack/repos/builtin/packages/emsdk/hello.c

@@ -0,0 +1,6 @@
+#include <stdio.h>
+
+int main() {
+  printf("hello, world!\n");
+  return 0;
+}

var/spack/repos/builtin/packages/ffmpeg/package.py

@@ -66,10 +66,11 @@ class Ffmpeg(AutotoolsPackage):
     variant('sdl2', default=False, description='sdl2 support')
     variant('shared', default=True, description='build shared libraries')
     variant('libx264', default=False, description='H.264 encoding')
+    variant('alsa', default=True, when='platform=linux', description='Build ALSA support')
 
-    depends_on('alsa-lib', when='platform=linux')
+    depends_on('alsa-lib', when='+alsa')
     depends_on('libiconv')
-    depends_on('yasm@1.2.0:')
+    # depends_on('yasm@1.2.0:')
     depends_on('zlib')
 
     depends_on('aom', when='+libaom')
@@ -132,6 +133,8 @@ def configure_args(self):
             '--cc={0}'.format(spack_cc),
             '--cxx={0}'.format(spack_cxx)
         ]
+        if '+alsa' not in self.spec:
+            config_args.append('--disable-alsa')
 
         # '+X' meta variant #
 

var/spack/repos/builtin/packages/yasm/package.py

@@ -3,6 +3,11 @@
 #
 # SPDX-License-Identifier: (Apache-2.0 OR MIT)
 
+import os
+import stat
+
+from llnl.util.filesystem import chmod_x
+
 from spack import *
 
 
@@ -23,3 +28,9 @@ class Yasm(AutotoolsPackage):
     depends_on('automake', when='@develop')
     depends_on('libtool', when='@develop')
     depends_on('m4', when='@develop')
+
+    @run_after('configure')
+    def make_genversion_executable(self):
+        with working_dir(self.stage.source_path):
+            st = os.stat('./genversion')
+            chmod_x('genversion', st.st_mode | stat.S_IXUSR)

var/spack/repos/builtin/packages/zlib/package.py

@@ -78,7 +78,10 @@ def install(self, spec, prefix):
             config_args = []
             if '~shared' in spec:
                 config_args.append('--static')
-            configure('--prefix={0}'.format(prefix), *config_args)
+            if self.spec.satisfies('%emscripten'):
+                emconfigure('--prefix={0}'.format(prefix), *config_args)
+            else:
+                configure('--prefix={0}'.format(prefix), *config_args)
 
             make()
             if self.run_tests: