openmpi: add Fortran support for MIPS32

We include a file containing cached values for Fortran tests that are
performed at the configure step. These tests fail when cross-compiling
and this is known upstream. See:

https://www.open-mpi.org/community/lists/users/2013/01/21186.php

In that thread the upstream maintainer admits that "cross compiling
OpenMPI is a known issue" and the way to workaround this is to
"pre-populate configure's answers to the Fortran tests (so that it
doesn't actually have to run anything)"

Signed-off-by: Vicente Olivert Riera <Vincent.Riera@imgtec.com>
[Thomas: use the config cache mechanism to preseed the cache variables.]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

1 files changed, 21 insertions, 2 deletions

diff --git a/package/openmpi/openmpi.mk b/package/openmpi/openmpi.mk
index 8871eaf10f..379ce572fb 100644
--- a/package/openmpi/openmpi.mk
+++ b/package/openmpi/openmpi.mk
@@ -13,8 +13,27 @@ OPENMPI_LICENSE_FILES = LICENSE
 OPENMPI_INSTALL_STAGING = YES
 OPENMPI_CONF_OPTS = --disable-vt
 
-# Disable fortran by default until we add BR2_TOOLCHAIN_HAS_FORTRAN
-# hidden symbol to our toolchain infrastructure
+# Enabling Fortran support requires pre-seeding the configure script
+# with various values that cannot be guessed, so we provide cache
+# files for various architectures.
+
+ifeq ($(BR2_TOOLCHAIN_HAS_FORTRAN),y)
+ifeq ($(BR2_mips)$(BR2_mipsel),y)
+OPENMPI_FORTRAN_CONF_CACHE = package/openmpi/openmpi-mips32-fortran.cache
+endif
+endif
+
+ifneq ($(OPENMPI_FORTRAN_CONF_CACHE),)
+define OPENMPI_COPY_FORTRAN_CACHE
+	cp $(OPENMPI_FORTRAN_CONF_CACHE) $(@D)/openmpi-config.cache
+endef
+
+OPENMPI_POST_PATCH_HOOKS += OPENMPI_COPY_FORTRAN_CACHE
+OPENMPI_CONF_OPTS += \
+	--enable-mpi-fortran=yes \
+	--cache-file=$(@D)/openmpi-config.cache
+else
 OPENMPI_CONF_OPTS += --enable-mpi-fortran=no
+endif
 
 $(eval $(autotools-package))