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Merge branch 'allow-alternative-CPP' into 'develop' 

[CMake] Allow setting QE_CPP for an alternative C preprocessor.

Closes #359

See merge request QEF/q-e!1513
This commit is contained in:
Ye Luo 2021-07-20 23:54:57 +00:00
parent 5f926c7fa1 e8fb61650f
commit 9cd47e8d26
2 changed files with 26 additions and 5 deletions
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23
CMakeLists.txt
View File

@ -215,7 +215,28 @@ if(CMAKE_Fortran_COMPILER_ID MATCHES "PGI" OR CMAKE_Fortran_COMPILER_ID MATCHES
endif()
############################################################
## Compiler vendor specific options
# C preprocessor
# Note: reply on the compiler preprocessor whenever possible
############################################################
if(DEFINED ENV{CPP})
set(QE_CPP_DEFAULT $ENV{CPP})
else()
set(QE_CPP_DEFAULT cpp)
endif()
# QE_CPP_DEFAULT is only effective when cached QE_CPP doesn't exist.
set(QE_CPP ${QE_CPP_DEFAULT} CACHE
STRING "C preprocessor for qe_preprocess_source in qeHelpers.cmake")
find_program(QE_CPP_FULL_PATH NAMES ${QE_CPP} DOC "C preprocessor full path")
if(QE_CPP_FULL_PATH)
message(STATUS "C preprocessor used by qe_preprocess_source in qeHelpers.cmake: ${QE_CPP_FULL_PATH}")
else()
set(QE_CPP_SAVED ${QE_CPP})
unset(QE_CPP CACHE)
message(FATAL_ERROR "C preprocessor ${QE_CPP_SAVED} not found. Pass a working one to CMake via QE_CPP!")
endif()
############################################################
# Compiler vendor specific options
############################################################
if(CMAKE_Fortran_COMPILER_ID MATCHES "GNU")
include(${PROJECT_CMAKE}/GNUFortranCompiler.cmake)

2
cmake/qeHelpers.cmake
View File

@ -41,7 +41,7 @@ function(qe_preprocess_source IN OUT)
endif()
add_custom_command(
OUTPUT ${OUT}
COMMAND cpp -P ${global_flags} -E ${IN} > ${OUT}
COMMAND ${QE_CPP_FULL_PATH} -P ${global_flags} -E ${IN} > ${OUT}
MAIN_DEPENDENCY ${IN}
COMMENT "Preprocessing ${IN}"
VERBATIM)