https://gcc.gnu.org/g:802eeb0ce083461a9f48e22c5d08ab862d88e0fd
commit r17-4836-g802eeb0ce083461a9f48e22c5d08ab862d88e0fd Author: LIU Hao <[email protected]> Date: Fri Sep 25 16:50:32 2026 +0800 libgfortran: Set `enable_caf_shmem` to true for Cygwin and MinGW hosts In libgfortran/caf/shmem/thread_support.{h,c}, pthread.h is included only when `!defined(WIN32) && !defined(__CYGWIN__)`. For Cygwin and MinGW hosts, native named mutexes and semaphores are used and a pthread library is not needed. This commit overrides the result of the previous check for pthread, so libcaf_shmem is always built for these hosts even when a pthread library isn't available. libgfortran/ChangeLog: * configure.ac: Set `enable_caf_shmem` to true for Cygwin and MinGW hosts. * configure: Regenerate. Signed-off-by: LIU Hao <[email protected]> Signed-off-by: Jonathan Yong <[email protected]> Diff: --- libgfortran/configure | 3 +++ libgfortran/configure.ac | 3 +++ 2 files changed, 6 insertions(+) diff --git a/libgfortran/configure b/libgfortran/configure index e81d6d7c6d16..223ec82667c9 100755 --- a/libgfortran/configure +++ b/libgfortran/configure @@ -18480,6 +18480,9 @@ case ${host} in # These versions define PTHREAD_PROCESS_SHARED but the functionality # is not available at runtime, so the configure check misleads. enable_caf_shmem=false;; + *-*-cygwin* | *-*-mingw*) + # The specific implementation for these platforms does not use pthread. + enable_caf_shmem=true;; esac if test x$enable_caf_shmem = xtrue; then ENABLE_CAF_SHMEM_TRUE= diff --git a/libgfortran/configure.ac b/libgfortran/configure.ac index a63e1c4480c3..c50112df91c6 100644 --- a/libgfortran/configure.ac +++ b/libgfortran/configure.ac @@ -380,6 +380,9 @@ case ${host} in # These versions define PTHREAD_PROCESS_SHARED but the functionality # is not available at runtime, so the configure check misleads. enable_caf_shmem=false;; + *-*-cygwin* | *-*-mingw*) + # The specific implementation for these platforms does not use pthread. + enable_caf_shmem=true;; esac AM_CONDITIONAL([ENABLE_CAF_SHMEM], [test x$enable_caf_shmem = xtrue])
