[Buildroot] [git commit branch/2021.02.x] package/eigen: override Fortran path

[Peter Korsgaard]

commit: https://git.buildroot.net/buildroot/commit/?id=1d5b7869119058b31480956c93054f3928141381
branch: https://git.buildroot.net/buildroot/commit/?id=refs/heads/2021.02.x

The language detection is falling back to the host system
Fortran compiler. An example of this is in RHEL7.9
(gcc4.8.5 20150623 (Red Hat 4.8.5-44)).

This patch bypasses detection and points to the location
where the compiler would be installed (if present). In the
cases where it doesn't exist, the detection falls through
and leaves Fortran disabled.

Fixes:
http://autobuild.buildroot.net/results/8354da225d1e5e337aa7ea62a7e6524fb5f1135f/

Signed-off-by: Matthew Weber <matthew.weber at collins.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni at bootlin.com>
(cherry picked from commit 9f591542452f2af2bb333dc24b34e85f6921ece4)
Signed-off-by: Peter Korsgaard <peter at korsgaard.com>
---
 package/eigen/eigen.mk | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/package/eigen/eigen.mk b/package/eigen/eigen.mk
index c9998da357..98e6c61e38 100644
--- a/package/eigen/eigen.mk
+++ b/package/eigen/eigen.mk
@@ -15,6 +15,7 @@ EIGEN_SUPPORTS_IN_SOURCE_BUILD = NO
 
 # Default Eigen CMake installs .pc file in /usr/share/pkgconfig
 # change it to /usr/lib/pkgconfig, to be consistent with other packages.
-EIGEN_CONF_OPTS = -DPKGCONFIG_INSTALL_DIR=/usr/lib/pkgconfig
+EIGEN_CONF_OPTS = -DPKGCONFIG_INSTALL_DIR=/usr/lib/pkgconfig \
+	-DCMAKE_Fortran_COMPILER=$(TARGET_FC)
 
 $(eval $(cmake-package))