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Print the llvm-config path on configuration error

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This is helpful on systems with multiple LLVM installations.

For example, OpenBSD ships with LLVM in the base system, but without
support for extra targets.

A full LLVM version can be installed using the ports system, but even
when it is, `cmake` is not going to pick it up unless `/usr/local` is
explicitly added to the `cmake` search paths.

Having the full `llvm-config` path printed on error is helpful to
understand that the detected LLVM version was not the expected one.
This commit is contained in:
Frank Denis 2020-09-26 17:10:33 +02:00
parent a502604702
commit 99c5d2d590
1 changed files with 4 additions and 4 deletions
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8
cmake/Findllvm.cmake
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@ -55,13 +55,13 @@ elseif("${ZIG_TARGET_TRIPLE}" STREQUAL "native")
OUTPUT_STRIP_TRAILING_WHITESPACE)
if("${LLVM_CONFIG_VERSION}" VERSION_LESS 10)
message(FATAL_ERROR "expected LLVM 10.x but found ${LLVM_CONFIG_VERSION}")
message(FATAL_ERROR "expected LLVM 10.x but found ${LLVM_CONFIG_VERSION} using ${LLVM_CONFIG_EXE}")
endif()
if("${LLVM_CONFIG_VERSION}" VERSION_EQUAL 11)
message(FATAL_ERROR "expected LLVM 10.x but found ${LLVM_CONFIG_VERSION}")
message(FATAL_ERROR "expected LLVM 10.x but found ${LLVM_CONFIG_VERSION} using ${LLVM_CONFIG_EXE}")
endif()
if("${LLVM_CONFIG_VERSION}" VERSION_GREATER 11)
message(FATAL_ERROR "expected LLVM 10.x but found ${LLVM_CONFIG_VERSION}")
message(FATAL_ERROR "expected LLVM 10.x but found ${LLVM_CONFIG_VERSION} using ${LLVM_CONFIG_EXE}")
endif()
execute_process(
@ -72,7 +72,7 @@ elseif("${ZIG_TARGET_TRIPLE}" STREQUAL "native")
function(NEED_TARGET TARGET_NAME)
list (FIND LLVM_TARGETS_BUILT "${TARGET_NAME}" _index)
if (${_index} EQUAL -1)
message(FATAL_ERROR "LLVM is missing target ${TARGET_NAME}. Zig requires LLVM to be built with all default targets enabled.")
message(FATAL_ERROR "LLVM (according to ${LLVM_CONFIG_EXE}) is missing target ${TARGET_NAME}. Zig requires LLVM to be built with all default targets enabled.")
endif()
endfunction(NEED_TARGET)
NEED_TARGET("AArch64")