Bug 1569370 - add mozconfig fragments for declaring wasm sandboxing bits; r=firefox-build-system-reviewers,rstewart

This patch is not ideal: if would be better to do the defaulting in
`toolkit/moz.configure`, but doing it there runs into problems with base
toolchain configurations, as the clang there is not new enough.  So we
have this, doing everything with environment variables, which is easily
turned on or off, depending on the needs of the specific configuration.

The `mozconfig.no-compile` change is not really needed, as the wasm
sandboxing detection bits are not conditional on
`--enable-compile-environment`.  Those bits should be, and I will tackle
doing that after the holidays.

Differential Revision: https://phabricator.services.mozilla.com/D58102

--HG--
extra : moz-landing-system : lando

browser/config/mozconfigs/linux64/asan-fuzzing-ccov

@@ -9,6 +9,7 @@ MOZ_REQUIRE_SIGNING=0
 ac_add_options "MOZ_ALLOW_LEGACY_EXTENSIONS=1"
 
 . $topsrcdir/build/mozconfig.stylo
+. $topsrcdir/build/mozconfig.wasm-sandboxing
 
 # ASan specific options on Linux
 ac_add_options --enable-valgrind

browser/config/mozconfigs/linux64/common-opt

@@ -1,6 +1,7 @@
 # This file is sourced by the nightly, beta, and release mozconfigs.
 
 . $topsrcdir/build/mozconfig.stylo
+. $topsrcdir/build/mozconfig.wasm-sandboxing
 
 ac_add_options --enable-update-channel=${MOZ_UPDATE_CHANNEL}
 ac_add_options --with-google-location-service-api-keyfile=/builds/gls-gapi.data

browser/config/mozconfigs/linux64/debug

@@ -1,6 +1,7 @@
 ac_add_options --enable-debug
 
 . $topsrcdir/build/mozconfig.stylo
+. $topsrcdir/build/mozconfig.wasm-sandboxing
 
 MOZ_AUTOMATION_L10N_CHECK=0
 

browser/config/mozconfigs/linux64/debug-asan

@@ -4,6 +4,7 @@ ac_add_options --enable-debug
 ac_add_options --enable-optimize="-O1"
 
 . $topsrcdir/build/mozconfig.stylo
+. $topsrcdir/build/mozconfig.wasm-sandboxing
 
 # ASan specific options on Linux
 ac_add_options --enable-valgrind

browser/config/mozconfigs/linux64/debug-fuzzing

@@ -1,6 +1,7 @@
 ac_add_options --enable-debug
 
 . $topsrcdir/build/mozconfig.stylo
+. $topsrcdir/build/mozconfig.wasm-sandboxing
 
 MOZ_AUTOMATION_L10N_CHECK=0
 

browser/config/mozconfigs/linux64/debug-searchfox-clang

@@ -8,6 +8,7 @@ MOZ_AUTOMATION_CHECK=0
 ac_add_options --enable-debug
 
 . $topsrcdir/build/mozconfig.stylo
+. $topsrcdir/build/mozconfig.wasm-sandboxing
 
 # Use Clang as specified in manifest
 export CC="$MOZ_FETCHES_DIR/clang/bin/clang"

browser/config/mozconfigs/linux64/debug-static-analysis-clang

@@ -7,6 +7,7 @@ MOZ_AUTOMATION_L10N_CHECK=0
 ac_add_options --enable-debug
 
 . $topsrcdir/build/mozconfig.stylo
+. $topsrcdir/build/mozconfig.wasm-sandboxing
 
 # Use Clang as specified in manifest
 export CC="$MOZ_FETCHES_DIR/clang/bin/clang"

browser/config/mozconfigs/linux64/nightly-asan

@@ -3,6 +3,7 @@ ac_add_options --disable-debug
 ac_add_options --enable-optimize="-O2 -gline-tables-only"
 
 . $topsrcdir/build/mozconfig.stylo
+. $topsrcdir/build/mozconfig.wasm-sandboxing
 
 # ASan specific options on Linux
 ac_add_options --enable-valgrind

browser/config/mozconfigs/linux64/nightly-fuzzing-asan

@@ -8,6 +8,7 @@ MOZ_REQUIRE_SIGNING=0
 ac_add_options "MOZ_ALLOW_LEGACY_EXTENSIONS=1"
 
 . $topsrcdir/build/mozconfig.stylo
+. $topsrcdir/build/mozconfig.wasm-sandboxing
 
 # ASan specific options on Linux
 ac_add_options --enable-valgrind

browser/config/mozconfigs/linux64/plain-opt

@@ -1,6 +1,12 @@
 export TOOLTOOL_DIR="$topsrcdir"
 export LLVM_CONFIG="${MOZ_FETCHES_DIR}/clang/bin/llvm-config"
 
+export WASM_SANDBOXED_LIBRARIES=graphite
+export LUCETC="${MOZ_FETCHES_DIR}/lucetc/lucetc"
+export WASI_SYSROOT="${MOZ_FETCHES_DIR}/wasi-sysroot/share/wasi-sysroot"
+export WASM_CC="${MOZ_FETCHES_DIR}/clang/bin/clang --target=wasm32-wasi"
+export WASM_CXX="${MOZ_FETCHES_DIR}/clang/bin/clang++ --target=wasm32-wasi"
+
 CARGO="${MOZ_FETCHES_DIR}/rustc/bin/cargo"
 RUSTC="${MOZ_FETCHES_DIR}/rustc/bin/rustc"
 RUSTDOC="${MOZ_FETCHES_DIR}/rustc/bin/rustdoc"

browser/config/mozconfigs/linux64/tsan

@@ -3,6 +3,7 @@ ac_add_options --disable-debug
 ac_add_options --enable-optimize="-O2 -gline-tables-only"
 
 . $topsrcdir/build/mozconfig.stylo
+. $topsrcdir/build/mozconfig.wasm-sandboxing
 
 . $topsrcdir/build/unix/mozconfig.tsan
 ac_add_options --disable-elf-hack

build/mozconfig.no-compile

@@ -38,3 +38,9 @@ unset AR
 unset NM
 unset RANLIB
 unset NASM
+
+unset WASM_SANDBOXED_LIBRARIES
+unset WASM_CC
+unset WASM_CXX
+unset LUCETC
+unset WASI_SYSROOT

build/mozconfig.wasm-sandboxing

@@ -0,0 +1,13 @@
+# Tell the build system about bits to build sandboxed wasm libraries.
+case "$PERFHERDER_EXTRA_OPTIONS" in
+base-toolchains*)
+    # Clang versions < 8.0 don't support wasm.
+    ;;
+*)
+    export WASM_SANDBOXED_LIBRARIES=graphite
+    export WASM_CC="${MOZ_FETCHES_DIR}/clang/bin/clang --target=wasm32-wasi"
+    export WASM_CXX="${MOZ_FETCHES_DIR}/clang/bin/clang++ --target=wasm32-wasi"
+    export LUCETC="${MOZ_FETCHES_DIR}/lucetc/lucetc"
+    export WASI_SYSROOT="${MOZ_FETCHES_DIR}/wasi-sysroot/share/wasi-sysroot"
+    ;;
+esac

toolkit/moz.configure

@@ -1774,6 +1774,7 @@ def wasm_sandboxing_libraries():
     return ('graphite',)
 
 option('--with-wasm-sandboxed-libraries',
+       env='WASM_SANDBOXED_LIBRARIES',
        help='Enable wasm sandboxing for the selected libraries',
        nargs='+',
        choices=dependable(wasm_sandboxing_libraries))