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[cmake] Use absolute paths for modules search 

For out of tree builds, the user generally needs to specify LLVM_DIR and
MLIR_DIR on the command line so that the correct LLVM and MLIR
installations are picked up.

If the provided paths are absolute, everything works fine, however for
buildbots it is customary to work with relative paths, and that makes it
difficult for CMake to find the right modules to include.

This patch changes CMakeLists.txt to convert LLVM_DIR and MLIR_DIR to
absolute paths before adding them to CMAKE_MODULE_PATH. The inputs are
assumed to be relative to the source directory (llvm-project/flang).

Differential Revision: https://reviews.llvm.org/D87083
This commit is contained in:
Diana Picus 2020-09-03 13:39:29 +02:00
parent edf244217a
commit d4b88ac165
1 changed files with 8 additions and 2 deletions
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10
flang/CMakeLists.txt
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@ -56,7 +56,10 @@ if (CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
# We need a pre-built/installed version of LLVM.
find_package(LLVM REQUIRED HINTS "${LLVM_CMAKE_PATH}")
list(APPEND CMAKE_MODULE_PATH ${LLVM_DIR})
# If the user specifies a relative path to LLVM_DIR, the calls to include
# LLVM modules fail. Append the absolute path to LLVM_DIR instead.
get_filename_component(LLVM_DIR_ABSOLUTE ${LLVM_DIR} REALPATH)
list(APPEND CMAKE_MODULE_PATH ${LLVM_DIR_ABSOLUTE})
# If LLVM links to zlib we need the imported targets so we can too.
if(LLVM_ENABLE_ZLIB)
@ -78,7 +81,10 @@ if (CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
find_package(MLIR REQUIRED CONFIG)
# Use SYSTEM for the same reasons as for LLVM includes
include_directories(SYSTEM ${MLIR_INCLUDE_DIRS})
list(APPEND CMAKE_MODULE_PATH ${MLIR_DIR})
# If the user specifies a relative path to MLIR_DIR, the calls to include
# MLIR modules fail. Append the absolute path to MLIR_DIR instead.
get_filename_component(MLIR_DIR_ABSOLUTE ${MLIR_DIR} REALPATH)
list(APPEND CMAKE_MODULE_PATH ${MLIR_DIR_ABSOLUTE})
include(AddMLIR)
find_program(MLIR_TABLEGEN_EXE "mlir-tblgen" ${LLVM_TOOLS_BINARY_DIR}
NO_DEFAULT_PATH)