[gnurl] 78/151: travis: do not use OVERRIDE_CC or OVERRIDE_CXX if empty

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commit 48da3ac67b7c8559ef4ce1636c4bcb9047439a9b
Author: Peter Wu <address@hidden>
AuthorDate: Sat Nov 30 18:42:20 2019 +0000

    travis: do not use OVERRIDE_CC or OVERRIDE_CXX if empty
    
    Fixes the macOS builds where OVERRIDE_CC and OVERRIDE_CXX are not set.
    
    Reported-by: Jay Satiro
    Fixes #4659
    Closes #4661
    Closes #4664
---
 .travis.yml | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/.travis.yml b/.travis.yml
index c157f7c87..94e13bfeb 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -439,8 +439,8 @@ matrix:
                       - zlib1g-dev
 
 before_install:
-    - export "${OVERRIDE_CC}"
-    - export "${OVERRIDE_CXX}"
+  - export "${OVERRIDE_CC-blank=}"
+  - export "${OVERRIDE_CXX-blank=}"
 
 install:
   - if [ "$T" = "coverage" ]; then pip2 install --user cpp-coveralls; fi

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