protobuf: link against libm under glibc

Fixes compilation.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

diff --git a/libs/protobuf/Makefile b/libs/protobuf/Makefile
index 7d23a379d5184ab4f58b1e855325e90c6030c4a4..0b9bab9e87bdf4e837362b578aada9b754b02694 100644 (file)
--- a/libs/protobuf/Makefile
+++ b/libs/protobuf/Makefile
@@ -81,7 +81,7 @@ CMAKE_OPTIONS += \
        -Dprotobuf_WITH_ZLIB=ON \
        -DBUILD_SHARED_LIBS=ON
 
-TARGET_LDFLAGS += -latomic
+TARGET_LDFLAGS += -latomic $(if $(CONFIG_USE_GLIBC),-lm)
 
 define Build/InstallDev
        $(call Build/InstallDev/cmake,$(1))