[build-script-impl] By default use the just built dsymutil to ensure that when we use the newer LLVM, the dsymutil supports newer debug info.

This can be disabled via the build-script-impl flag:

darwin-install-extract-symbols-use-just-built-dsymutil

Author: gottesmm

utils/build-script-impl

@@ -101,6 +101,7 @@ KNOWN_SETTINGS=(
     darwin-deployment-version-tvos                "9.0"             "minimum deployment target version for tvOS"
     darwin-deployment-version-watchos             "2.0"             "minimum deployment target version for watchOS"
     darwin-install-extract-symbols                ""                "whether to extract symbols with dsymutil during installations"
+    darwin-install-extract-symbols-use-just-built-dsymutil "1"       "whether we should extract symbols using the just built dsymutil"
     darwin-overlay-target                         ""                "single overlay target to build, dependencies are computed later"
     darwin-sdk-deployment-targets                 "xctest-ios-8.0"  "semicolon-separated list of triples like 'fookit-ios-9.0;barkit-watchos-9.0'"
     darwin-stdlib-install-name-dir                ""                "the directory of the install_name for standard library dylibs"
@@ -866,6 +867,10 @@ function xcrun_find_tool() {
   xcrun --sdk macosx --toolchain "${DARWIN_XCRUN_TOOLCHAIN}" --find "$@"
 }
 
+function find_just_built_local_host_llvm_tool() {
+  find $(build_directory "${LOCAL_HOST}" llvm) -name "$1" -type f -print
+}
+
 function not() {
     if [[ ! "$1" ]] ; then
         echo 1
@@ -2846,14 +2851,21 @@ for host in "${ALL_HOSTS[@]}"; do
             (cd "${CURRENT_INSTALL_DIR}" &&
              find ./"${CURRENT_PREFIX}" -perm -0111 -type f -print | cpio --insecure -pdm "${INSTALL_SYMROOT}")
 
+            dsymutil_path=
+            if [[ -n "${DARWIN_INSTALL_EXTRACT_SYMBOLS_USE_JUST_BUILT_DSYMUTIL}" ]]; then
+                dsymutil_path=$(find_just_built_local_host_llvm_tool dsymutil)
+            else
+                dsymutil_path=$(xcrun_find_tool dsymutil)
+            fi
+
             # Run dsymutil on executables and shared libraries.
             #
             # Exclude shell scripts and static archives.
             (cd "${INSTALL_SYMROOT}" &&
              find ./"${CURRENT_PREFIX}" -perm -0111 -type f -print | \
                grep -v '.py$' | \
                grep -v '.a$' | \
-               xargs -n 1 -P ${BUILD_JOBS} $(xcrun_find_tool dsymutil))
+               xargs -n 1 -P ${BUILD_JOBS} ${dsymutil_path})
 
             # Strip executables, shared libraries and static libraries in
             # `host_install_destdir`.