Petr Hosek b667153cf6 [CMake] Use __libc_start_main rather than fopen when checking for C library ...

The check_library_exists CMake uses a custom symbol definition. This
is a problem when checking for C library symbols because Clang
recognizes many of them as builtins, and returns the
-Wbuiltin-requires-header (or -Wincompatible-library-redeclaration)
error. When building with -Werror which is the default, this causes
the check_library_exists check fail making the build think that C
library isn't available.

To avoid this issue, we should use a symbol that isn't recognized by
Clang and wouldn't cause the same issue. __libc_start_main seems like
reasonable choice that fits the bill.

Differential Revision: https://reviews.llvm.org/D57142

llvm-svn: 352341

2019-01-28 04:12:54 +00:00

..

Modules

[CMake] Passthrough CFLAGS when checking the compiler-rt path

2018-11-14 00:09:26 +00:00

config-ix.cmake

[CMake] Use __libc_start_main rather than fopen when checking for C library

2019-01-28 04:12:54 +00:00