commit ab42e6fcbf412be2319d86a8cfdf750233464f1e
author Adhemerval Zanella <adhemerval.zanella@linaro.org> Tue Aug 21 11:49:25 2018 -0300
committer Adhemerval Zanella <adhemerval.zanella@linaro.org> Tue Aug 21 14:51:59 2018 -0300
tree be10b0e9c1ad0be0ba5d36d32bc66455939ff836
parent bd58729085435057dc8611eeafad6f76cf72f543

Use --Bsymbolic-functions on libm

This option removes mostly of the PLT calls for internal symbol, they
are routed to internal entrypoint instead.  It should be safe for libm,
since symbol interposing is not supported.

For arm64 the remaining PLTs are __cxa_finalize, ldexp, __stack_chk_fail,
isnanf, memset, and isxdigit.  All of them are expected (clang (r339432)
does not have optimization for isnan/isinf inline expansion and these
symbols are defined on libc.so).

Test: Builds, ran unit tests on arm and x86.

Change-Id: I1eb1a9f2b30f21788d9ad8639b4a0a15f6d0566a

libm/Android.bp

diff --git a/libm/Android.bp b/libm/Android.bp
index 3c375c7..3b88fa3 100644
--- a/libm/Android.bp
+++ b/libm/Android.bp
@@ -504,6 +504,10 @@
         "-Wno-unused-variable",
     ],
 
+    ldflags: [
+        "-Wl,--Bsymbolic-functions",
+    ],
+
     include_dirs: ["bionic/libc"],
     system_shared_libs: ["libc"],