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cmake: find LLVM libraries unambiguously

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Before, we would end up with the LLVM_LIBRARIES variable containing,
for example, "-lLLVMAnalysis;-lz" and the Zig compiler CLI would be
stuck with ambiguous library names. In this branch, that ambiguity is
not allowed; it will look for a dynamically linked LLVMAnalysis and fail
to find it in the case that the build of LLVM is static.

With this change, LLVM_LIBRARIES will contain, for example,
"/full/path/to/libLLVMAnalysis.a;-lz" and it is unambiguous that the
first library should be linked statically and the second dynamically.

In the case of a dynamically linked system LLVM, it will look like
"/full/path/to/libLLVM.so;-lz" which again is fully unambiguous.

This fixes building Zig from source.
This commit is contained in:
Andrew Kelley 2023-08-01 18:45:19 -07:00
parent 8e687cb0d9
commit 5c441f7f8a
1 changed files with 21 additions and 57 deletions
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78
cmake/Findllvm.cmake
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@ -52,6 +52,8 @@ if(ZIG_USE_LLVM_CONFIG)
set(STATIC_OR_SHARED_LINK "--link-shared")
elseif (ZIG_STATIC_LLVM)
set(STATIC_OR_SHARED_LINK "--link-static")
else()
set(STATIC_OR_SHARED_LINK "")
endif()
execute_process(
@ -103,69 +105,31 @@ if(ZIG_USE_LLVM_CONFIG)
break()
endwhile()
if(ZIG_SHARED_LLVM OR ZIG_STATIC_LLVM)
execute_process(
COMMAND ${LLVM_CONFIG_EXE} --libfiles ${STATIC_OR_SHARED_LINK}
OUTPUT_VARIABLE LLVM_LIBRARIES_SPACES
OUTPUT_STRIP_TRAILING_WHITESPACE)
string(REPLACE " " ";" LLVM_LIBRARIES "${LLVM_LIBRARIES_SPACES}")
execute_process(
COMMAND ${LLVM_CONFIG_EXE} --libdir ${STATIC_OR_SHARED_LINK}
OUTPUT_VARIABLE LLVM_LIBDIRS_SPACES
OUTPUT_STRIP_TRAILING_WHITESPACE)
string(REPLACE " " ";" LLVM_LIBDIRS "${LLVM_LIBDIRS_SPACES}")
execute_process(
COMMAND ${LLVM_CONFIG_EXE} --shared-mode ${STATIC_OR_SHARED_LINK}
OUTPUT_VARIABLE LLVM_LINK_MODE
OUTPUT_STRIP_TRAILING_WHITESPACE)
execute_process(
COMMAND ${LLVM_CONFIG_EXE} --system-libs ${STATIC_OR_SHARED_LINK}
OUTPUT_VARIABLE LLVM_SYSTEM_LIBS_SPACES
OUTPUT_STRIP_TRAILING_WHITESPACE)
string(REPLACE " " ";" LLVM_SYSTEM_LIBS "${LLVM_SYSTEM_LIBS_SPACES}")
execute_process(
COMMAND ${LLVM_CONFIG_EXE} --shared-mode ${STATIC_OR_SHARED_LINK}
OUTPUT_VARIABLE LLVM_LINK_MODE
execute_process(
COMMAND ${LLVM_CONFIG_EXE} --libfiles ${STATIC_OR_SHARED_LINK}
OUTPUT_VARIABLE LLVM_LIBRARIES_SPACES
OUTPUT_STRIP_TRAILING_WHITESPACE)
else()
execute_process(
COMMAND ${LLVM_CONFIG_EXE} --libs
OUTPUT_VARIABLE LLVM_LIBRARIES_SPACES
OUTPUT_STRIP_TRAILING_WHITESPACE)
string(REPLACE " " ";" LLVM_LIBRARIES "${LLVM_LIBRARIES_SPACES}")
string(REPLACE " " ";" LLVM_LIBRARIES "${LLVM_LIBRARIES_SPACES}")
execute_process(
COMMAND ${LLVM_CONFIG_EXE} --libdir
OUTPUT_VARIABLE LLVM_LIBDIRS_SPACES
OUTPUT_STRIP_TRAILING_WHITESPACE)
string(REPLACE " " ";" LLVM_LIBDIRS "${LLVM_LIBDIRS_SPACES}")
execute_process(
COMMAND ${LLVM_CONFIG_EXE} --system-libs
OUTPUT_VARIABLE LLVM_SYSTEM_LIBS_SPACES
OUTPUT_STRIP_TRAILING_WHITESPACE)
string(REPLACE " " ";" LLVM_SYSTEM_LIBS "${LLVM_SYSTEM_LIBS_SPACES}")
execute_process(
COMMAND ${LLVM_CONFIG_EXE} --shared-mode
OUTPUT_VARIABLE LLVM_LINK_MODE
execute_process(
COMMAND ${LLVM_CONFIG_EXE} --libdir ${STATIC_OR_SHARED_LINK}
OUTPUT_VARIABLE LLVM_LIBDIRS_SPACES
OUTPUT_STRIP_TRAILING_WHITESPACE)
endif()
string(REPLACE " " ";" LLVM_LIBDIRS "${LLVM_LIBDIRS_SPACES}")
if (${LLVM_LINK_MODE} STREQUAL "shared")
# We always ask for the system libs corresponding to static linking,
# since on some distros LLD is only available as a static library
# and we need these libraries to link it successfully
execute_process(
COMMAND ${LLVM_CONFIG_EXE} --system-libs --link-static
OUTPUT_VARIABLE LLVM_STATIC_SYSTEM_LIBS_SPACES
ERROR_QUIET # Some installations have no static libs, we just ignore the failure
OUTPUT_STRIP_TRAILING_WHITESPACE)
string(REPLACE " " ";" LLVM_STATIC_SYSTEM_LIBS "${LLVM_STATIC_SYSTEM_LIBS_SPACES}")
execute_process(
COMMAND ${LLVM_CONFIG_EXE} --system-libs ${STATIC_OR_SHARED_LINK}
OUTPUT_VARIABLE LLVM_SYSTEM_LIBS_SPACES
OUTPUT_STRIP_TRAILING_WHITESPACE)
string(REPLACE " " ";" LLVM_SYSTEM_LIBS "${LLVM_SYSTEM_LIBS_SPACES}")
set(LLVM_LIBRARIES ${LLVM_LIBRARIES} ${LLVM_SYSTEM_LIBS} ${LLVM_STATIC_SYSTEM_LIBS})
else()
set(LLVM_LIBRARIES ${LLVM_LIBRARIES} ${LLVM_SYSTEM_LIBS})
endif()
set(LLVM_LIBRARIES ${LLVM_LIBRARIES} ${LLVM_SYSTEM_LIBS})
execute_process(
COMMAND ${LLVM_CONFIG_EXE} --includedir
@ -373,4 +337,4 @@ endif()
include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(llvm DEFAULT_MSG LLVM_LIBRARIES LLVM_INCLUDE_DIRS)
mark_as_advanced(LLVM_INCLUDE_DIRS LLVM_LIBRARIES LLVM_LIBDIRS)
mark_as_advanced(LLVM_INCLUDE_DIRS LLVM_LIBRARIES LLVM_LIBDIRS LLVM_LINK_MODE)