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Set Fortran/C compiler from CIME Macros.cmake before project() #33

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Merged
jgfouca merged 1 commit into from
Aug 3, 2026
Merged

Set Fortran/C compiler from CIME Macros.cmake before project() #33

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26 changes: 26 additions & 0 deletions CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -2,6 +2,32 @@ cmake_minimum_required (VERSION 3.14)

if (NOT DEFINED PROJECT_NAME)
set(CPRNC_STANDALONE TRUE)

# When cprnc is configured directly by CIME (see
# CIME/build_scripts/buildlib.cprnc), a Macros.cmake defining SFC/MPIFC
# (among other things) is dropped into CMAKE_BINARY_DIR before this
# CMakeLists.txt is processed. CMAKE_Fortran_COMPILER/CMAKE_C_COMPILER
# must be set from those variables *before* the project() call below,
# otherwise CMake falls back to its own default Fortran compiler search
# (which tries the bare name "f95" first), potentially picking up an
# unrelated system Fortran compiler instead of the one CIME configured
# for this machine/compiler (e.g. a stray /usr/bin/f95 built against a
# different netcdf.mod ABI than the intended toolchain).
if (EXISTS ${CMAKE_BINARY_DIR}/Macros.cmake)
# CIME_initial_setup (below) includes Macros.cmake -- and therefore the
# machine's compiler-specific *.cmake file (e.g. gnu.cmake) -- before
# project() has run. Some of those files key off CMAKE_SYSTEM_PROCESSOR
# (e.g. to select -mcmodel on aarch64), which CMake only populates once
# project() has detected the toolchain. Pre-populate it here from `uname
# -m` so those checks see the real architecture even at this early point,
# without needing any special-casing in the shared machine cmake files.
if (NOT CMAKE_SYSTEM_PROCESSOR)
execute_process(COMMAND uname -m OUTPUT_VARIABLE CMAKE_SYSTEM_PROCESSOR
OUTPUT_STRIP_TRAILING_WHITESPACE)
endif()
list(APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/../src/CMake)
include(CIME_initial_setup)
endif()
endif()

project (cprnc Fortran C)
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