From 37ddfd7d6e448185fc15b320b44785d06ab62577 Mon Sep 17 00:00:00 2001
From: Philip Hyunsu Cho <chohyu01@cs.washington.edu>
Date: Fri, 15 Feb 2019 07:23:05 -0800
Subject: [PATCH] Fix broken R test: Install Homebrew GCC (#4142)

* Fix broken R test: Install Homebrew GCC

Missing GCC Fortran causes installation failure of a dependency package
(igraph)

* Register gfortran system-wide

* Use correct keg

* Set env vars to change compiler choice

* Do not break other Mac builds

* Nuclear option: symlink gfortran

* Use /usr/local/bin instead of /usr/bin

* Symlink library path too

* Update run_test.sh
---
 .travis.yml              | 1 +
 tests/travis/run_test.sh | 6 ++++++
 2 files changed, 7 insertions(+)

diff --git a/.travis.yml b/.travis.yml
index b0a9b052f..877ebdcbc 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -68,6 +68,7 @@ addons:
       - g++-7
   homebrew:
     packages:
+      - gcc@7
       - graphviz
     update: true
 
diff --git a/tests/travis/run_test.sh b/tests/travis/run_test.sh
index 61dbe35a1..c2efa0e22 100755
--- a/tests/travis/run_test.sh
+++ b/tests/travis/run_test.sh
@@ -87,6 +87,12 @@ if [ ${TASK} == "r_test" ]; then
     export _R_CHECK_TIMINGS_=0
     export R_BUILD_ARGS="--no-build-vignettes --no-manual"
     export R_CHECK_ARGS="--no-vignettes --no-manual"
+    if [ ${TRAVIS_OS_NAME} == "osx" ]; then
+        # Work-around to fix "gfortran command not found" error
+        sudo ln -s $(which gfortran-7) /usr/local/bin/gfortran
+        sudo mkdir -p /usr/local/gfortran/lib/gcc/x86_64-apple-darwin15
+        sudo ln -s /usr/local/lib/gcc/7 /usr/local/gfortran/lib/gcc/x86_64-apple-darwin15/6.1.0
+    fi
 
     curl -OL http://raw.github.com/craigcitro/r-travis/master/scripts/travis-tool.sh
     chmod 755 ./travis-tool.sh