From 4f869bccc14fb2fa19df130e76c022765ecda924 Mon Sep 17 00:00:00 2001
From: John Ericson <John.Ericson@Obsidian.Systems>
Date: Wed, 22 Nov 2017 16:29:57 -0500
Subject: [PATCH] cc-wrapper: Don't treat "-" alone as a flag

It means stdin, and is morally equivalent to passing a file. e.g.

  $ echo 'int main(void) { return 0; }' | gcc -x c -

will compile and link a binary.
---
 pkgs/build-support/cc-wrapper/cc-wrapper.sh | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/pkgs/build-support/cc-wrapper/cc-wrapper.sh b/pkgs/build-support/cc-wrapper/cc-wrapper.sh
index 82f5c6443d54..df1afef33745 100644
--- a/pkgs/build-support/cc-wrapper/cc-wrapper.sh
+++ b/pkgs/build-support/cc-wrapper/cc-wrapper.sh
@@ -59,7 +59,8 @@ while (( "$n" < "$nParams" )); do
         cppInclude=0
     elif [ "$p" = -nostdinc++ ]; then
         cppInclude=0
-    elif [ "${p:0:1}" != - ]; then
+    elif [[ "$p" != -?* ]]; then
+        # A dash alone signifies standard input; it is not a flag
         nonFlagArgs=1
     fi
     n+=1