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musl >= 1.2.4 only defines lseek64 and friends if _LARGEFILE64_SOURCE is
defined. This causes the symbol check to "succeed" but compilation to
later fail.
--- llvm-14.0.6.src/cmake/config-ix.cmake.old 2022-06-22 11:46:24.000000000 -0500
+++ llvm-14.0.6.src/cmake/config-ix.cmake 2023-05-05 21:36:46.662084291 -0500
@@ -250,9 +250,7 @@
if( HAVE_SIGNAL_H AND NOT LLVM_USE_SANITIZER MATCHES ".*Address.*" AND NOT APPLE )
check_symbol_exists(sigaltstack signal.h HAVE_SIGALTSTACK)
endif()
-set(CMAKE_REQUIRED_DEFINITIONS "-D_LARGEFILE64_SOURCE")
check_symbol_exists(lseek64 "sys/types.h;unistd.h" HAVE_LSEEK64)
-set(CMAKE_REQUIRED_DEFINITIONS "")
check_symbol_exists(mallctl malloc_np.h HAVE_MALLCTL)
check_symbol_exists(mallinfo malloc.h HAVE_MALLINFO)
check_symbol_exists(mallinfo2 malloc.h HAVE_MALLINFO2)
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