[Buildroot] [git commit branch/2021.05.x] package/eigen: override Fortran path

commit: https://git.buildroot.net/buildroot/commit/?id=69b1fb954b54c7dd1ba9ee92c687d8f0e3e75e17
branch: https://git.buildroot.net/buildroot/commit/?id=refs/heads/2021.05.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 <redacted>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit 9f591542452f2af2bb333dc24b34e85f6921ece4)
Signed-off-by: Peter Korsgaard <peter@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))

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