From f9deef8d070e7e7f35f40b5e790b24f10334aa06 Mon Sep 17 00:00:00 2001
From: John Firebaugh <john.firebaugh@gmail.com>
Date: Thu, 19 Jul 2018 15:47:50 -0700
Subject: [build] See what happened when `npm install` fails

---
 cmake/mbgl.cmake | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/cmake/mbgl.cmake b/cmake/mbgl.cmake
index 0809d911a9..7f2eaf86b0 100644
--- a/cmake/mbgl.cmake
+++ b/cmake/mbgl.cmake
@@ -44,9 +44,13 @@ if(WITH_NODEJS)
             execute_process(
                 COMMAND "${NodeJS_EXECUTABLE}" "${npm_EXECUTABLE}" install --ignore-scripts
                 WORKING_DIRECTORY "${DIRECTORY}"
-                RESULT_VARIABLE NPM_INSTALL_FAILED)
+                RESULT_VARIABLE NPM_INSTALL_FAILED
+                OUTPUT_VARIABLE NPM_OUTPUT
+                ERROR_VARIABLE NPM_OUTPUT)
             if(NOT NPM_INSTALL_FAILED)
                 execute_process(COMMAND ${CMAKE_COMMAND} -E touch "${DIRECTORY}/node_modules/.${NAME}.stamp")
+            else()
+                message(FATAL_ERROR "NPM install failed:\n${NPM_OUTPUT}")
             endif()
         endif()
 
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