commit b8bda98c91418aa7a0a195e932fdefc7eb557d7c
author Elliott Hughes <enh@google.com> Tue Jan 26 16:54:54 2021 -0800
committer Elliott Hughes <enh@google.com> Tue Jan 26 16:54:54 2021 -0800
tree 8b2661e040d8b1e9d7d228184db7f263834de4a3
parent b6555e44b306400f2cd306afb1f26eac226947bc

Build libm with _GNU_SOURCE.

To avoid:

  ndk/bionic/libm/upstream-freebsd/lib/msun/src/k_exp.c:108:2:
    error: implicit declaration of function 'sincos' is invalid in C99
        sincos(y, &s, &c);
        ^
  1 error generated.

Test: treehugger
Change-Id: I1c3b9f7583a92aec4809f073806f19516c66054d

sources/android/support/Android.mk

diff --git a/sources/android/support/Android.mk b/sources/android/support/Android.mk
index c9a908f..18e5186 100644
--- a/sources/android/support/Android.mk
+++ b/sources/android/support/Android.mk
@@ -122,7 +122,7 @@
 
 LOCAL_CPPFLAGS := \
     -fvisibility-inlines-hidden \
-    -std=c++11 \
+    -std=gnu++11 \
 
 include $(BUILD_STATIC_LIBRARY)