Bug 1796518 - Tweak lld flags for faster linkage on developer builds. r=firefox-build-system-reviewers,nalexander

Differential Revision: https://phabricator.services.mozilla.com/D159832

build/moz.configure/toolchain.configure

@@ -1673,10 +1673,17 @@ set_config("LINKER_KIND", select_linker.KIND)
     target_multiarch_dir,
     android_platform,
     c_compiler,
+    developer_options,
 )
 @imports("os")
 def linker_ldflags(
-    linker, target, sysroot, multiarch_dir, android_platform, c_compiler
+    linker,
+    target,
+    sysroot,
+    multiarch_dir,
+    android_platform,
+    c_compiler,
+    developer_options,
 ):
     flags = list((linker and linker.LINKER_FLAG) or [])
     # rpath-link is irrelevant to wasm, see for more info https://github.com/emscripten-core/emscripten/issues/11076.
@@ -1701,6 +1708,8 @@ def linker_ldflags(
         flags.append("-Wl,--rpath-link={}/usr/lib".format(android_platform))
         flags.append("--sysroot")
         flags.append(android_platform)
+    if developer_options and linker.KIND == "lld" and target.kernel != "WINNT":
+        flags.append("-Wl,-O0")
     return flags
 
 

js/src/old-configure.in

@@ -255,12 +255,14 @@ if test "$GNU_CC"; then
                   AC_MSG_RESULT([no])
                   LDFLAGS=$_SAVE_LDFLAGS)
 
-    AC_MSG_CHECKING([for --build-id=sha1 option to ld])
-    _SAVE_LDFLAGS=$LDFLAGS
-    LDFLAGS="$LDFLAGS -Wl,--build-id=sha1"
-    AC_TRY_LINK(,,AC_MSG_RESULT([yes]),
-                  AC_MSG_RESULT([no])
-                  LDFLAGS=$_SAVE_LDFLAGS)
+    if test -z "$DEVELOPER_OPTIONS" -o "$OS_TARGET" = "Android"; then
+        AC_MSG_CHECKING([for --build-id=sha1 option to ld])
+        _SAVE_LDFLAGS=$LDFLAGS
+        LDFLAGS="$LDFLAGS -Wl,--build-id=sha1"
+        AC_TRY_LINK(,,AC_MSG_RESULT([yes]),
+                      AC_MSG_RESULT([no])
+                      LDFLAGS=$_SAVE_LDFLAGS)
+    fi
 
     _DEFINES_CFLAGS="-include $jsconfdefs -DMOZILLA_CLIENT"
 fi

old-configure.in

@@ -269,12 +269,14 @@ if test "$GNU_CC"; then
                   AC_MSG_RESULT([no])
                   LDFLAGS=$_SAVE_LDFLAGS)
 
-    AC_MSG_CHECKING([for --build-id=sha1 option to ld])
-    _SAVE_LDFLAGS=$LDFLAGS
-    LDFLAGS="$LDFLAGS -Wl,--build-id=sha1"
-    AC_TRY_LINK(,,AC_MSG_RESULT([yes]),
-                  AC_MSG_RESULT([no])
-                  LDFLAGS=$_SAVE_LDFLAGS)
+    if test -z "$DEVELOPER_OPTIONS" -o "$OS_TARGET" = "Android"; then
+        AC_MSG_CHECKING([for --build-id=sha1 option to ld])
+        _SAVE_LDFLAGS=$LDFLAGS
+        LDFLAGS="$LDFLAGS -Wl,--build-id=sha1"
+        AC_TRY_LINK(,,AC_MSG_RESULT([yes]),
+                      AC_MSG_RESULT([no])
+                      LDFLAGS=$_SAVE_LDFLAGS)
+    fi
 
     AC_MSG_CHECKING([for --ignore-unresolved-symbol option to ld])
     HAVE_LINKER_SUPPORT_IGNORE_UNRESOLVED=