Bug 1522436 - Enable BigInt compilation by default r=jandem,terpri,froydnj

Differential Revision: https://phabricator.services.mozilla.com/D17487

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

config/system-headers.mozbuild

@@ -1338,11 +1338,6 @@ if CONFIG['MOZ_SYSTEM_ICU']:
         'unicode/utypes.h',
     ]
 
-if CONFIG['ENABLE_BIGINT']:
-    system_headers += [
-        'gmp.h'
-    ]
-
 if CONFIG['MOZ_WAYLAND']:
     system_headers += [
         'xkbcommon/xkbcommon.h',

js/moz.configure

@@ -109,11 +109,10 @@ def disable_export_js(value):
 
 # Experimental BigInt support
 # =======================================================
-js_option('--enable-bigint',
-          default=False,
-          help='Enable BigInt')
+js_option('--disable-bigint',
+          help='{Enable|Disable} BigInt')
 
-@depends('--enable-bigint')
+@depends('--disable-bigint')
 def enable_bigint(value):
     if value:
         return True
@@ -123,10 +122,8 @@ set_define('ENABLE_BIGINT', enable_bigint)
 
 # JIT support
 # =======================================================
-@depends(target, '--enable-bigint')
-def ion_default(target, enable_bigint):
-    if enable_bigint:
-        return False
+@depends(target)
+def ion_default(target):
     if target.cpu in ('x86', 'x86_64', 'arm', 'aarch64', 'mips32', 'mips64'):
         return True
     return False

js/src/build.rs

@@ -26,9 +26,11 @@ fn main() {
 
     env::set_current_dir(&js_src).unwrap();
 
-    let variant = format!("{}{}",
-                          if cfg!(feature = "bigint") { "bigint" } else { "plain" },
-                          if cfg!(feature = "debugmozjs") { "debug" } else { "" });
+    let variant = if cfg!(feature = "debugmozjs") {
+        "plaindebug"
+    } else {
+        "plain"
+    };
 
     let python = env::var("PYTHON").unwrap_or("python2.7".into());
     let mut cmd = Command::new(&python);
@@ -64,10 +66,6 @@ fn main() {
     println!("cargo:rustc-link-search=native={}/dist/bin", out_dir);
     println!("cargo:rustc-link-lib=nspr4");
 
-    if cfg!(feature = "bigint") {
-        println!("cargo:rustc-link-lib=gmp");
-    }
-
     if target.contains("windows") {
         println!("cargo:rustc-link-lib=winmm");
         if target.contains("gnu") {

js/src/build/moz.build

@@ -47,11 +47,6 @@ if CONFIG['ENABLE_INTL_API']:
         'icu',
     ]
 
-if CONFIG['ENABLE_BIGINT']:
-    OS_LIBS += [
-        'gmp',
-    ]
-
 USE_LIBS += [
     'nspr',
     'zlib',