[compiler-rt] 8669225 - [compiler-rt] Allow building builtins.a without a libc (#86737)

[via llvm-commits]

Author: Jon Chesterfield
Date: 2024-03-26T22:33:03Z
New Revision: 86692258637549ed9f863c3d2ba47b49f61bbc1f

URL: https://github.com/llvm/llvm-project/commit/86692258637549ed9f863c3d2ba47b49f61bbc1f
DIFF: https://github.com/llvm/llvm-project/commit/86692258637549ed9f863c3d2ba47b49f61bbc1f.diff

LOG: [compiler-rt] Allow building builtins.a without a libc (#86737)

compiler-rt may depend on libc (memset etc). Likewise a libc built by
clang may depend on compiler-rt builtins.

This circular dependency doesn't matter much once they're both compiled.
The easy compilation order to build both from source is:

1. install libc headers somewhere
2. build compiler-rt builtins against those headers
3. build libc against compiler-rt builtins

This patch relaxes the cmake sanity check to pass without requiring a
libc library. That allows the above sequence to work. Otherwise one
needs to build a static libc, then use that to pass the compiler-rt
cmake check, then build a normal libc.

Added: 
    

Modified: 
    compiler-rt/cmake/config-ix.cmake

Removed: 
    


################################################################################
diff  --git a/compiler-rt/cmake/config-ix.cmake b/compiler-rt/cmake/config-ix.cmake
index 46a6fdf8728ff8..911f48fa13816c 100644
--- a/compiler-rt/cmake/config-ix.cmake
+++ b/compiler-rt/cmake/config-ix.cmake
@@ -235,9 +235,9 @@ set(COMPILER_RT_SUPPORTED_ARCH)
 # Try to compile a very simple source file to ensure we can target the given
 # platform. We use the results of these tests to build only the various target
 # runtime libraries supported by our current compilers cross-compiling
-# abilities.
+# abilities. Avoids using libc as that may not be available yet.
 set(SIMPLE_SOURCE ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/simple.cc)
-file(WRITE ${SIMPLE_SOURCE} "#include <stdlib.h>\n#include <stdio.h>\nint main(void) { printf(\"hello, world\"); }\n")
+file(WRITE ${SIMPLE_SOURCE} "int main(void) { return 0; }\n")
 
 # Detect whether the current target platform is 32-bit or 64-bit, and setup
 # the correct commandline flags needed to attempt to target 32-bit and 64-bit.