mac: In static library builds, link against a static libc++.a

To achieve this, just add a -Lthird_party/libc++-static flag to the link line,
and add a postbuild that checks that Chromium Framework depends on neither
libstdc++.dylib nor libc++.dylib Use the existing verify_order postbuild
for this, and let it not run in component builds (since what it checks for
isn't interesting in that config, and we do depend on system libc++ in
component builds).

Also don't do this in asan builds. asan already requires OS X 10.7+.
And don't do this for targets below native_client, since those still
use the 10.6 SDK (!).

This change is small but subtle, see thread
"[chromium-dev] Intent to implement: Statically linking libc++ for Chrome/Mac"
and the document linked from comment 14 on the bug for details.

Ideally, this has no observable behavior change. If it looks like this
breaks tests somewhere, especially on 10.6, please revert. (The bots
like it, and the things I tried on 10.6 worked too, though.)

BUG=400091,544325
R=mark@chromium.org

Committed: https://chromium.googlesource.com/chromium/src/+/494270d01189f8b4b2b4ebd501fd980833489729

Committed: https://chromium.googlesource.com/chromium/src/+/0f56cff872068cef226e7ad3f9701eb41d4eb2f5

Review URL: https://codereview.chromium.org/1413863003

Cr-Commit-Position: refs/heads/master@{#355966}

1 files changed, 16 insertions, 0 deletions

diff --git a/chrome/tools/build/mac/verify_order b/chrome/tools/build/mac/verify_order
index 3d5d644..cfa4c5a 100755
--- a/chrome/tools/build/mac/verify_order
+++ b/chrome/tools/build/mac/verify_order
@@ -12,6 +12,8 @@
 #
 # This script can be used to verify that all of the global text symbols in
 # a Mach-O file are accounted for in an order file.
+#
+# Also check that the file does not depend on either of libstdc++ or libc++.
 
 if [ ${#} -ne 2 ] ; then
   echo "usage: ${0} LAST_SYMBOL MACH_O_FILE" >& 2
@@ -40,4 +42,18 @@ if [ ${?} -eq 0 ] || [ -n "${UNORDERED_SYMBOLS}" ] ; then
   exit 1
 fi
 
+LIBS=$(otool -L "${MACH_O_FILE}")
+if [ ${?} -ne 0 ] ; then
+  echo "${0}: failed to get libraries in ${MACH_O_FILE}" >& 2
+  exit 1
+fi
+if grep -Fq libstdc++ <<< ${LIBS} ; then
+  echo "${0}: ${MACH_O_FILE} depends on libstdc++" >& 2
+  exit 1
+fi
+if grep -Fq libc++ <<< ${LIBS} ; then
+  echo "${0}: ${MACH_O_FILE} depends on libc++" >& 2
+  exit 1
+fi
+
 exit 0