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lfortran

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lfortran
Official main repository for LFortran

C++ · 1242 stars

Beginner friendly Everything

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test_lfortran_cmdline: the invalid-command-line-flag assertion is inverted and can never fail Open

tests

Difficulty 1/5 Under an hour Newbie friendliness 90/100

lfortran/lfortran#13212 · Opened Sep 18, 2026
REPL overwrites an existing file named `input` Open

bug

Difficulty 2/5 1-3 hours Newbie friendliness 84/100

lfortran/lfortran#13189 · 1 comment · Opened Sep 17, 2026
Cleanup: resolve_proc_pointer_placeholders re-resolves placeholders already in placeholder_to_real Open

derived types

Difficulty 2/5 1-3 hours Newbie friendliness 72/100

lfortran/lfortran#13154 · Opened Sep 15, 2026
Refactor: is_struct_type_parameter is duplicated in semantics and asr_verify Open

derived types

Difficulty 2/5 1-3 hours Newbie friendliness 78/100

lfortran/lfortran#13152 · Opened Sep 15, 2026
OpenMP: omp_lib has no omp_set_max_active_levels or omp_get_max_active_levels Open

openmp

Difficulty 2/5 1-3 hours Newbie friendliness 86/100

lfortran/lfortran#13021 · Opened Sep 14, 2026
OpenMP: omp do without a schedule clause has no implicit barrier at end do Open

openmp

Difficulty 2/5 1-3 hours Newbie friendliness 86/100

lfortran/lfortran#12999 · Opened Sep 14, 2026
OpenMP: a blank after a nested parenthesis splits the clause, e.g. map(tofrom: a(1:4), b) Open

openmp

Difficulty 2/5 1-3 hours Newbie friendliness 88/100

lfortran/lfortran#12979 · Opened Sep 14, 2026
Type mismatch in initialization error omits kinds: `t` cannot be assigned to `integer` for integer(8) :: i = z Open

better error message

Difficulty 2/5 1-3 hours Newbie friendliness 84/100

lfortran/lfortran#12953 · Opened Sep 14, 2026
--lookup-name / --rename-symbol without --line and --column print Unknown Exception Open

Compiler-Options

Difficulty 2/5 1-3 hours Newbie friendliness 82/100

lfortran/lfortran#12916 · Opened Sep 14, 2026
--gpu=cuda_cpu on macOS: linker warns 'ignoring duplicate libraries: -lm' Open

bug GPU

Difficulty 2/5 1-3 hours Newbie friendliness 88/100

lfortran/lfortran#12885 · Opened Sep 14, 2026
Integration tests race over a shared test.txt and fail intermittently under parallel ctest Open

Difficulty 2/5 1-3 hours Newbie friendliness 78/100

lfortran/lfortran#12498 · Opened Aug 13, 2026
IAND/IOR/IEOR accept two BOZ literal arguments without a semantic error Open

Difficulty 2/5 1-3 hours Newbie friendliness 78/100

lfortran/lfortran#12471 · Opened Aug 10, 2026
Patch test suite bugs: missing no_llvm logic, unused flags Open

Difficulty 2/5 1-3 hours Newbie friendliness 72/100

lfortran/lfortran#11370 · Opened May 5, 2026
Fix destructive cache wiping in run_tests.py Open

Difficulty 2/5 1-3 hours Newbie friendliness 78/100

lfortran/lfortran#11367 · Opened May 5, 2026
Normalize line ends in `./run_tests.py -u` Open

Difficulty 2/5 1-3 hours Newbie friendliness 65/100

lfortran/lfortran#11217 · Opened Apr 23, 2026
--help option needs more information Open

Difficulty 2/5 1-3 hours Newbie friendliness 68/100

lfortran/lfortran#11127 · Opened Apr 17, 2026
Build warning at compile time Open

good first issue

Difficulty 1/5 Under an hour Newbie friendliness 65/100

lfortran/lfortran#6715 · 6 comments · Opened Mar 22, 2025
Mention need to install zstd with Miniconda on Windows Open

Difficulty 1/5 Under an hour Newbie friendliness 62/100

lfortran/lfortran#6256 · 2 reactions · Opened Feb 8, 2025
enh: add support for testing FORTRAN 77 and older files with `.f` extension Open

enhancement

Difficulty 2/5 1-3 hours Newbie friendliness 62/100

lfortran/lfortran#4504 · Opened Jul 13, 2024

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