Changes to LLVM easyblock required for LLVM 21

[Crivella]

Changes

• Filter unsupported flang args from FFLAGS and F90FLAGS as now flang is used to compile some .mod files
  Fixes error of the type flang-21: error: unknown argument: '-fno-math-errno' during the build step
• Added EC config parameter test_suite_include_benchmarks to allow including/excluding benchmarks in the test-suite

WIP

• Ensure LLVM_INCLUDE_BENCHMARKS is set both for the projects and runtimes builds
  • It seems that even passing it to the runtimes build is still not honored afterward in make check-all Failing tests on building 21.1.0-rc2 llvm/llvm-project#151972 (comment)

[bartoldeman]

I also need this change:

--- llvm.py.1   2025-11-11 18:57:04.979489101 +0000
+++ llvm.py     2025-11-11 18:58:56.322052977 +0000
@@ -1103,7 +1103,7 @@
         opts = [f'--gcc-install-dir={self.gcc_prefix}']
 
         if self.dynamic_linker:
-            opts.append(f'-Wl,-dynamic-linker,{self.dynamic_linker}')
+            opts.append(f'-Wl,-dynamic-linker={self.dynamic_linker}')
             # The --dyld-prefix flag exists, but beside being poorly documented it is also not supported by flang
             # https://reviews.llvm.org/D851
             # prefix = self.sysroot.rstrip('/')

otherwise clang-nvlink-wrapper complains.

[Crivella]

@boegelbot please test @ jsc-zen3
CORE_CNT=16
EB_ARGS="--installpath /tmp/$USER/ebpr-3902 LLVM-16.0.6-GCCcore-12.3.0.eb LLVM-18.1.8-GCCcore-13.3.0-minimal.eb LLVM-20.1.5-GCCcore-13.2.0.eb LLVM-20.1.8-GCCcore-14.3.0.eb"

[boegelbot]

@Crivella: Request for testing this PR well received on jsczen3l1.int.jsc-zen3.fz-juelich.de

PR test command 'if [[ develop != 'develop' ]]; then EB_BRANCH=develop ./easybuild_develop.sh 2> /dev/null 1>&2; EB_PREFIX=/home/boegelbot/easybuild/develop source init_env_easybuild_develop.sh; fi; EB_PR=3902 EB_ARGS="--installpath /tmp/$USER/ebpr-3902 LLVM-16.0.6-GCCcore-12.3.0.eb LLVM-18.1.8-GCCcore-13.3.0-minimal.eb LLVM-20.1.5-GCCcore-13.2.0.eb LLVM-20.1.8-GCCcore-14.3.0.eb" EB_CONTAINER= EB_REPO=easybuild-easyblocks EB_BRANCH=develop /opt/software/slurm/bin/sbatch --job-name test_PR_3902 --ntasks="16" ~/boegelbot/eb_from_pr_upload_jsc-zen3.sh' executed!

• exit code: 0
• output:

Submitted batch job 9346

Test results coming soon (I hope)...

Details

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Message to humans: this is just bookkeeping information for me,
it is of no use to you (unless you think I have a bug, which I don't).

[boegelbot]

Test report by @boegelbot

Overview of tested easyconfigs (in order)

• SUCCESS LLVM-16.0.6-GCCcore-12.3.0.eb

• SUCCESS LLVM-18.1.8-GCCcore-13.3.0-minimal.eb

• SUCCESS LLVM-20.1.5-GCCcore-13.2.0.eb

• SUCCESS LLVM-20.1.8-GCCcore-14.3.0.eb

Build succeeded for 4 out of 4 (total: 6 hours 8 mins 24 secs) (4 easyconfigs in total)
jsczen3c2.int.jsc-zen3.fz-juelich.de - Linux Rocky Linux 9.7, x86_64, AMD EPYC-Milan Processor (zen3), Python 3.9.23
See https://gist.github.com/boegelbot/61beb4bd9b0fa8310b888ae91ce263d4 for a full test report.