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Re-apply "Fix cmake check for futimens when deploying to earlier macOS releases."

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This fixes an issue with the use of LLVM_PARALLEL_LINK_JOBS.

Original commit message:
macOS 10.13 added a new API (futimens). This API is only available on macOS 10.13
and later, but the cmake check we have in place only tests if the symbol is
present and ignores the availability attribute. Luckily we have new warning for
this and by making this warning an error the cmake check will return the correct
result.

See also rdar://problem/33992750.

Differential Revision: https://reviews.llvm.org/D37027

llvm-svn: 311965
This commit is contained in:
Juergen Ributzka 2017-08-29 00:34:56 +00:00
parent 5496868ee8
commit 4cf55125f0
2 changed files with 10 additions and 0 deletions
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9
cmake/config-ix.cmake
View File

@ -8,6 +8,7 @@ include(CheckIncludeFileCXX)
include(CheckLibraryExists)
include(CheckSymbolExists)
include(CheckFunctionExists)
include(CheckCCompilerFlag)
include(CheckCXXSourceCompiles)
include(TestBigEndian)
@ -179,6 +180,14 @@ check_symbol_exists(arc4random "stdlib.h" HAVE_DECL_ARC4RANDOM)
find_package(Backtrace)
set(HAVE_BACKTRACE ${Backtrace_FOUND})
set(BACKTRACE_HEADER ${Backtrace_HEADER})
# Prevent check_symbol_exists from using API that is not supported for a given
# deployment target.
check_c_compiler_flag("-Werror=unguarded-availability-new" "C_SUPPORTS_WERROR_UNGUARDED_AVAILABILITY_NEW")
if(C_SUPPORTS_WERROR_UNGUARDED_AVAILABILITY_NEW)
set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -Werror=unguarded-availability-new")
endif()
check_symbol_exists(_Unwind_Backtrace "unwind.h" HAVE__UNWIND_BACKTRACE)
check_symbol_exists(getpagesize unistd.h HAVE_GETPAGESIZE)
check_symbol_exists(sysconf unistd.h HAVE_SYSCONF)

1
cmake/modules/HandleLLVMOptions.cmake
View File

@ -383,6 +383,7 @@ elseif( LLVM_COMPILER_IS_GCC_COMPATIBLE )
append_if(LLVM_ENABLE_WERROR "-Werror" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
append_if(LLVM_ENABLE_WERROR "-Wno-error" CMAKE_REQUIRED_FLAGS)
add_flag_if_supported("-Werror=date-time" WERROR_DATE_TIME)
add_flag_if_supported("-Werror=unguarded-availability-new" WERROR_UNGUARDED_AVAILABILITY_NEW)
if (LLVM_ENABLE_CXX1Y)
check_cxx_compiler_flag("-std=c++1y" CXX_SUPPORTS_CXX1Y)
append_if(CXX_SUPPORTS_CXX1Y "-std=c++1y" CMAKE_CXX_FLAGS)