pkg: Check INCLUDE environment variable for MSVC

On Windows builds when --msvc-syntax is in use, add paths in the INCLUDE
environment variable to the system include search path and ignore the
various GCC environment variables. See
https://msdn.microsoft.com/en-us/library/73f9s62w.aspx for details.

https://bugs.freedesktop.org/show_bug.cgi?id=94729

1 files changed, 21 insertions, 2 deletions

diff --git a/check/check-system-flags b/check/check-system-flags
index 831dd0e..632496c 100755
--- a/check/check-system-flags
+++ b/check/check-system-flags
@@ -39,9 +39,28 @@ run_test --cflags system
 RESULT="-L/usr/lib -lsystem"
 run_test --libs system
 
-# Now check that the various compiler environment variables also update
-# the system include path
+# Now check that the various GCC environment variables also update the
+# system include path
 for var in CPATH C_INCLUDE_PATH CPP_INCLUDE_PATH; do
     RESULT=""
     eval $var=/usr/include run_test --cflags system
+
+    # Make sure these are not skipped in --msvc-syntax mode
+    if [ "$native_win32" = yes ]; then
+        RESULT="-I/usr/include"
+        eval $var=/usr/include run_test --cflags --msvc-syntax system
+    fi
+done
+
+# Check that the various MSVC environment variables also update the
+# system include path when --msvc-syntax is in use
+for var in INCLUDE; do
+    RESULT="-I/usr/include"
+    eval $var=/usr/include run_test --cflags system
+
+    # Make sure these are skipped in --msvc-syntax mode
+    if [ "$native_win32" = yes ]; then
+        RESULT=""
+        eval $var=/usr/include run_test --cflags --msvc-syntax system
+    fi
 done