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cmake: Print all LLVM config errors instead of just the last one

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If you have multiple llvm-config executables in your path, and all of
them cause failures, then only the last failure will be printed. This
can cause confusion when the multiple llvm-config executables are from
different major LLVM versions, i.e. LLVM 13 and 14, which might mask an
error that happened on the LLVM 14 llvm-config with an unrelated error.

This commit makes it so that all errors are collected into a list and
printed all at once; this way, you can see how each llvm-config
executable failed to configure properly. Note that the failures still
won't be printed if a successful configuration is found.
This commit is contained in:
sin-ack 2022-07-30 10:57:44 +00:00 • committed by Andrew Kelley
parent c0a1b4fa46
commit b35490c217
1 changed files with 7 additions and 5 deletions
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12
cmake/Findllvm.cmake
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@ -10,6 +10,7 @@
if(ZIG_USE_LLVM_CONFIG) if(ZIG_USE_LLVM_CONFIG)
set(LLVM_CONFIG_ERROR_MESSAGES "")
while(1) while(1)
unset(LLVM_CONFIG_EXE CACHE) unset(LLVM_CONFIG_EXE CACHE)
find_program(LLVM_CONFIG_EXE find_program(LLVM_CONFIG_EXE
@ -21,7 +22,8 @@ if(ZIG_USE_LLVM_CONFIG)
"C:/Libraries/llvm-14.0.0/bin") "C:/Libraries/llvm-14.0.0/bin")
if ("${LLVM_CONFIG_EXE}" STREQUAL "LLVM_CONFIG_EXE-NOTFOUND") if ("${LLVM_CONFIG_EXE}" STREQUAL "LLVM_CONFIG_EXE-NOTFOUND")
if (DEFINED LLVM_CONFIG_ERROR_MESSAGE) if (NOT LLVM_CONFIG_ERROR_MESSAGES STREQUAL "")
list(JOIN LLVM_CONFIG_ERROR_MESSAGES "\n" LLVM_CONFIG_ERROR_MESSAGE)
message(FATAL_ERROR ${LLVM_CONFIG_ERROR_MESSAGE}) message(FATAL_ERROR ${LLVM_CONFIG_ERROR_MESSAGE})
else() else()
message(FATAL_ERROR "unable to find llvm-config") message(FATAL_ERROR "unable to find llvm-config")
@ -37,7 +39,7 @@ if(ZIG_USE_LLVM_CONFIG)
get_filename_component(LLVM_CONFIG_DIR "${LLVM_CONFIG_EXE}" DIRECTORY) get_filename_component(LLVM_CONFIG_DIR "${LLVM_CONFIG_EXE}" DIRECTORY)
if("${LLVM_CONFIG_VERSION}" VERSION_LESS 14 OR "${LLVM_CONFIG_VERSION}" VERSION_EQUAL 15 OR "${LLVM_CONFIG_VERSION}" VERSION_GREATER 15) if("${LLVM_CONFIG_VERSION}" VERSION_LESS 14 OR "${LLVM_CONFIG_VERSION}" VERSION_EQUAL 15 OR "${LLVM_CONFIG_VERSION}" VERSION_GREATER 15)
# Save the error message, in case this is the last llvm-config we find # Save the error message, in case this is the last llvm-config we find
set(LLVM_CONFIG_ERROR_MESSAGE "expected LLVM 14.x but found ${LLVM_CONFIG_VERSION} using ${LLVM_CONFIG_EXE}") list(APPEND LLVM_CONFIG_ERROR_MESSAGES "expected LLVM 14.x but found ${LLVM_CONFIG_VERSION} using ${LLVM_CONFIG_EXE}")
# Ignore this directory and try the search again # Ignore this directory and try the search again
list(APPEND CMAKE_IGNORE_PATH "${LLVM_CONFIG_DIR}") list(APPEND CMAKE_IGNORE_PATH "${LLVM_CONFIG_DIR}")
@ -61,9 +63,9 @@ if(ZIG_USE_LLVM_CONFIG)
if (LLVM_CONFIG_ERROR) if (LLVM_CONFIG_ERROR)
# Save the error message, in case this is the last llvm-config we find # Save the error message, in case this is the last llvm-config we find
if (ZIG_SHARED_LLVM) if (ZIG_SHARED_LLVM)
set(LLVM_CONFIG_ERROR_MESSAGE "LLVM 14.x found at ${LLVM_CONFIG_EXE} does not support linking as a shared library") list(APPEND LLVM_CONFIG_ERROR_MESSAGES "LLVM 14.x found at ${LLVM_CONFIG_EXE} does not support linking as a shared library")
else() else()
set(LLVM_CONFIG_ERROR_MESSAGE "LLVM 14.x found at ${LLVM_CONFIG_EXE} does not support linking as a static library") list(APPEND LLVM_CONFIG_ERROR_MESSAGES "LLVM 14.x found at ${LLVM_CONFIG_EXE} does not support linking as a static library")
endif() endif()
# Ignore this directory and try the search again # Ignore this directory and try the search again
@ -81,7 +83,7 @@ if(ZIG_USE_LLVM_CONFIG)
list (FIND LLVM_TARGETS_BUILT "${TARGET_NAME}" _index) list (FIND LLVM_TARGETS_BUILT "${TARGET_NAME}" _index)
if (${_index} EQUAL -1) if (${_index} EQUAL -1)
# Save the error message, in case this is the last llvm-config we find # Save the error message, in case this is the last llvm-config we find
set(LLVM_CONFIG_ERROR_MESSAGE "LLVM (according to ${LLVM_CONFIG_EXE}) is missing target ${TARGET_NAME}. Zig requires LLVM to be built with all default targets enabled.") list(APPEND LLVM_CONFIG_ERROR_MESSAGES "LLVM (according to ${LLVM_CONFIG_EXE}) is missing target ${TARGET_NAME}. Zig requires LLVM to be built with all default targets enabled.")
# Ignore this directory and try the search again # Ignore this directory and try the search again
list(APPEND CMAKE_IGNORE_PATH "${LLVM_CONFIG_DIR}") list(APPEND CMAKE_IGNORE_PATH "${LLVM_CONFIG_DIR}")