Replace cmake check for printf with a check for fopen.
Printf is a builtin, and the check fails with -Werror because of a clang
warning about an incompatible redeclaration.
git-svn-id: https://llvm.org/svn/llvm-project/libcxxabi/trunk@255186 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/cmake/config-ix.cmake b/cmake/config-ix.cmake
index 5405587..ec702e1 100644
--- a/cmake/config-ix.cmake
+++ b/cmake/config-ix.cmake
@@ -39,7 +39,7 @@
check_cxx_compiler_flag(/GR- LIBCXXABI_HAS_NO_GR_FLAG)
# Check libraries
-check_library_exists(c printf "" LIBCXXABI_HAS_C_LIB)
+check_library_exists(c fopen "" LIBCXXABI_HAS_C_LIB)
check_library_exists(dl dladdr "" LIBCXXABI_HAS_DL_LIB)
check_library_exists(pthread pthread_once "" LIBCXXABI_HAS_PTHREAD_LIB)
check_library_exists(gcc_eh _Unwind_GetRegionStart "" LIBCXXABI_HAS_GCC_EH_LIB)
