fix ios cross-compilation on armv7, armv7s

CMakeLists.txt

@@ -15,7 +15,7 @@ file(GLOB_RECURSE PADDLE_MOBILE_H src/*.h)
 include_directories(src/)
 
 if(IS_IOS)
-    set(CMAKE_CXX_FLAGS "-mfpu=neon -fobjc-abi-version=2 -fobjc-arc -std=gnu++11 -stdlib=libc++ -O3 -s -isysroot ${CMAKE_OSX_SYSROOT} ${CMAKE_CXX_FLAGS}")
+    set(CMAKE_CXX_FLAGS "-mfpu=neon -marm -fobjc-abi-version=2 -fobjc-arc -std=gnu++11 -stdlib=libc++ -O3 -s -isysroot ${CMAKE_OSX_SYSROOT} ${CMAKE_CXX_FLAGS}")
 else()
     set(CMAKE_CXX_FLAGS "-std=c++14 -O3 -s ${CMAKE_CXX_FLAGS}")
 endif()
@@ -43,7 +43,7 @@ if (LOG_PROFILE)
     add_definitions(-DPADDLE_MOBILE_PROFILE)
 endif()
 
-if(USE_OPENMP)
+if(USE_OPENMP AND NOT IS_IOS)
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fopenmp")
     add_definitions(-DPADDLE_MOBILE_USE_OPENMP)
 endif()