Hi Jerry & Andre,
the commit r16-7734-g136940891b16ba breaks cross compilation:
Jerry D wrote:
From: Andre Vehreschild<[email protected]>
Date: Thu, 12 Feb 2026 11:17:47 -0800
Subject: [PATCH] Fortran: Add a shared memory coarray implementation [PR88076]
Add caf_shmem, a shared memory multi process coarray implementation.
The library adheres to the existing coarray ABI and is controlled by
environment variables for selecting the number of images and virtual
memory size.
...
libgfortran/ChangeLog:
* Makefile.am: Add new library.
* Makefile.in: Regenerated
* acinclude.m4: Add check for reasonable clzl.
* config.h.in: Regenerate.
* configure: Regenerate.
* configure.ac: Call clzl check.
* * *
--- a/libgfortran/acinclude.m4
+++ b/libgfortran/acinclude.m4
...
+AC_DEFUN([LIBGFOR_CHECK_SANE_BUILTIN_CLZL], [
+ AC_RUN_IFELSE([AC_LANG_PROGRAM([[
+ int main()
+ {
+ return __builtin_clzl(256) != 8;
+ }]], [[]])],
+ AC_DEFINE(HAVE_SANE_BUILTIN_CLZL, 1,
+ [Define if __builtin_clzl behaves as expected.])
+ AM_CONDITIONAL([HAVE_SANE_BUILTIN_CLZL],true),
+ [AM_CONDITIONAL([HAVE_SANE_BUILTIN_CLZL],false)])
+])
This fails with:
configure: error: in build-gcc-trunk-offload-amdgcn/amdgcn-amdhsa/libgfortran'
configure: error: cannot run test program while cross compiling
Namely, the generated configure file contains:
# Check if __builtin_clzl behaves (it doesn't on Msys2/ucrt64).
if test "$cross_compiling" = yes; then :
{ { $as_echo "$as_me:${as_lineno-$LINENO}: error: in \`$ac_pwd':" >&5
$as_echo "$as_me: error: in \`$ac_pwd':" >&2;}
as_fn_error $? "cannot run test program while cross compiling
See \`config.log' for more details" "$LINENO" 5; }
else
In the code, you can either use code like:
if test "$cross_compiling" != no; then
for the current code and the following in an else branch.
Or just the following:
case "${host}" in
*-*-mingw32*)
....
;;
*)
....
;;
esac
In any case, AC_RUN_IFELSE is wrong for cross compilation,
AC_COMPILE_IFELSE is fine.
Tobias
