[flang] Change c_intmax_t to 64 bit to correspond to intmax_t in C

[eugeneepshteyn]

gcc, clang, and other C compiles define intmax_t to be 64 bit. Change flang's definition of c_intmax_t to be compatible.

Fixes #128609

[eugeneepshteyn]

Discussion: https://discourse.llvm.org/t/redefining-c-intmax-t/86032

[llvm-ci]

LLVM Buildbot has detected a new failure on builder flang-arm64-windows-msvc running on linaro-armv8-windows-msvc-01 while building flang at step 7 "test-build-unified-tree-check-flang".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/207/builds/558

Here is the relevant piece of the build log for the reference

Step 7 (test-build-unified-tree-check-flang) failure: test (failure)
******************** TEST 'Flang :: Lower/OpenMP/omp-lib-num-threads.f90' FAILED ********************
Exit Code: 1

Command Output (stdout):
--
# RUN: at line 3
c:\users\tcwg\llvm-worker\flang-arm64-windows-msvc\build\bin\flang.exe -fc1 -emit-hlfir -fopenmp -J C:/Users/tcwg/llvm-worker/flang-arm64-windows-msvc/build/runtimes/runtimes-bins/openmp/runtime/src C:\Users\tcwg\llvm-worker\flang-arm64-windows-msvc\llvm-project\flang\test\Lower\OpenMP\omp-lib-num-threads.f90 -o - 2>&1 | c:\users\tcwg\llvm-worker\flang-arm64-windows-msvc\build\bin\filecheck.exe C:\Users\tcwg\llvm-worker\flang-arm64-windows-msvc\llvm-project\flang\test\Lower\OpenMP\omp-lib-num-threads.f90
# executed command: 'c:\users\tcwg\llvm-worker\flang-arm64-windows-msvc\build\bin\flang.exe' -fc1 -emit-hlfir -fopenmp -J C:/Users/tcwg/llvm-worker/flang-arm64-windows-msvc/build/runtimes/runtimes-bins/openmp/runtime/src 'C:\Users\tcwg\llvm-worker\flang-arm64-windows-msvc\llvm-project\flang\test\Lower\OpenMP\omp-lib-num-threads.f90' -o -
# note: command had no output on stdout or stderr
# error: command failed with exit status: 1
# executed command: 'c:\users\tcwg\llvm-worker\flang-arm64-windows-msvc\build\bin\filecheck.exe' 'C:\Users\tcwg\llvm-worker\flang-arm64-windows-msvc\llvm-project\flang\test\Lower\OpenMP\omp-lib-num-threads.f90'
# .---command stderr------------
# | C:\Users\tcwg\llvm-worker\flang-arm64-windows-msvc\llvm-project\flang\test\Lower\OpenMP\omp-lib-num-threads.f90:24:9: error: CHECK: expected string not found in input
# | !CHECK: fir.call @omp_set_num_threads
# |         ^
# | <stdin>:1:1: note: scanning from here
# | error: Semantic errors in C:\Users\tcwg\llvm-worker\flang-arm64-windows-msvc\llvm-project\flang\test\Lower\OpenMP\omp-lib-num-threads.f90
# | ^
# | <stdin>:1:105: note: possible intended match here
# | error: Semantic errors in C:\Users\tcwg\llvm-worker\flang-arm64-windows-msvc\llvm-project\flang\test\Lower\OpenMP\omp-lib-num-threads.f90
# |                                                                                                         ^
# | 
# | Input file: <stdin>
# | Check file: C:\Users\tcwg\llvm-worker\flang-arm64-windows-msvc\llvm-project\flang\test\Lower\OpenMP\omp-lib-num-threads.f90
# | 
# | -dump-input=help explains the following input dump.
# | 
# | Input was:
# | <<<<<<
# |             1: error: Semantic errors in C:\Users\tcwg\llvm-worker\flang-arm64-windows-msvc\llvm-project\flang\test\Lower\OpenMP\omp-lib-num-threads.f90 
# | check:24'0     X~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ error: no match found
# | check:24'1                                                                                                             ?                                  possible intended match
# |             2: C:/Users/tcwg/llvm-worker/flang-arm64-windows-msvc/build/runtimes/runtimes-bins/openmp/runtime/src\omp_lib.mod:513:16: error: Cannot use module file for module 'iso_c_binding': File is not the right module file for 'iso_c_binding': C:\Users\tcwg\llvm-worker\flang-arm64-windows-msvc\build\bin/../include/flang/iso_c_binding.mod 
# | check:24'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# |             3:  use,intrinsic::iso_c_binding,only:c_ptr 
# | check:24'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# |             4:  ^^^^^^^^^^^^^ 
# | check:24'0     ~~~~~~~~~~~~~~~
# |             5: C:/Users/tcwg/llvm-worker/flang-arm64-windows-msvc/build/runtimes/runtimes-bins/openmp/runtime/src\omp_lib.mod:516:6: error: Derived type 'c_ptr' not found 
# | check:24'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# |             6:  type(c_ptr)::omp_target_alloc 
# | check:24'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# |             .
# |             .
# |             .
# | >>>>>>
# `-----------------------------
# error: command failed with exit status: 1

--
...

[eugeneepshteyn]

LLVM Buildbot has detected a new failure on builder flang-arm64-windows-msvc running on linaro-armv8-windows-msvc-01 while building flang at step 7 "test-build-unified-tree-check-flang".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/207/builds/558

Was iso_c_binding.mod file not updated somehow on ARM Windows?

2: C:/Users/tcwg/llvm-worker/flang-arm64-windows-msvc/build/runtimes/runtimes-bins/openmp/runtime/src\omp_lib.mod:513:16: error: Cannot use module file for module 'iso_c_binding': File is not the right module file for 'iso_c_binding': C:\Users\tcwg\llvm-worker\flang-arm64-windows-msvc\build\bin/../include/flang/iso_c_binding.mod

[luporl]

Was iso_c_binding.mod file not updated somehow on ARM Windows?

At least on ARM Windows, the change in iso_c_binding.f90 did not cause iso_c_binding.mod to be updated.
A clean build fixed the failure.

[akuhlens]

LGTM