Re: [PATCH] libgomp: Fix gfortran detection when program is found via PATH

Pinging this. The latch fixed this problem in w64devkit
https://github.com/skeeto/w64devkit/issues/395

So I'm sure it's correct.

May 28, 2026 10:14:48 PM Peter Damianov <[email protected]>:

> The custom gfortran detection logic in libgomp's configure uses
> "test -x" to check whether the $GFORTRAN program is executable.
> However, "test -x" only succeeds for absolute or relative paths that
> name an existing file; it fails for bare program names (e.g.
> "x86_64-w64-mingw32-gfortran") that are found via $PATH lookup.
> 
> This causes FC to be incorrectly set to "no" in cross-compilation
> environments where $GFORTRAN is a bare command name rather than a
> full path.  As a result, the Fortran OpenMP module (omp_lib.mod) is
> never installed, and programs that "use omp_lib" fail with:
> 
>   Fatal Error: Cannot open module file 'omp_lib.mod' for reading
> 
> The fix adds a "command -v" fallback for testing whether a command
> is available on $PATH.
> 
> The bug was introduced in r0-98199-g2122aa973ed
> (2010-01-26), so the Fortran OpenMP module has been missing from
> cross-compiled installs for 16 years.
> 
> libgomp/ChangeLog:
> 
>     * configure.ac: Also accept $GFORTRAN when it can be found
>     via PATH lookup using "command -v", not only when "test -x"
>     succeeds on the bare name.
>     * configure: Regenerate.
> ---
> libgomp/configure    | 2 +-
> libgomp/configure.ac | 2 +-
> 2 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/libgomp/configure b/libgomp/configure
> index 56cffe79634..a56c5691c26 100755
> --- a/libgomp/configure
> +++ b/libgomp/configure
> @@ -12270,7 +12270,7 @@ case `echo $GFORTRAN` in
>      FC=no ;;
>    *)
>      set dummy $GFORTRAN; ac_word=$2
> -    if test -x "$ac_word"; then
> +    if test -x "$ac_word" || command -v "$ac_word" >/dev/null 2>&1; then
>        FC="$GFORTRAN"
>      else
>        FC=no
> diff --git a/libgomp/configure.ac b/libgomp/configure.ac
> index 1730c62c74c..2cde2a05df4 100644
> --- a/libgomp/configure.ac
> +++ b/libgomp/configure.ac
> @@ -164,7 +164,7 @@ case `echo $GFORTRAN` in
>      FC=no ;;
>    *)
>      set dummy $GFORTRAN; ac_word=$2
> -    if test -x "$ac_word"; then
> +    if test -x "$ac_word" || command -v "$ac_word" >/dev/null 2>&1; then
>        FC="$GFORTRAN"
>      else
>        FC=no
> -- 
> 2.54.0