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Allow setting `CC' in Unix build (#58051).

* builds/unix/unix-cc.in (CC): Use `override'.  The command line
  value of `CC' (if any) is stored already in `CCraw'.

git/fs: mount .git/fs: mount/attach disallowed

--- a/ChangeLog

+++ b/ChangeLog

@@ -1,3 +1,10 @@

+2020-04-08  Werner Lemberg  <[email protected]>

+

+	Allow setting `CC' in Unix build (#58051).

+

+	* builds/unix/unix-cc.in (CC): Use `override'.  The command line

+	  value of `CC' (if any) is stored already in `CCraw'.

+

 2020-04-04  Nikhil Ramakrishnan  <[email protected]>

 	[woff2] Return if single stream operation fails.

--- a/builds/unix/unix-cc.in

+++ b/builds/unix/unix-cc.in

@@ -87,8 +87,12 @@

 # C compiler to use -- we use libtool!

 #

-CCraw := $(CC)

-CC    := $(LIBTOOL) --mode=compile $(CCraw)

+# CC might be set on the command line; we store this value in `CCraw'.

+# Consequently, we use the `override' directive to ensure that the

+# libtool call is always prepended.

+#

+CCraw       := $(CC)

+override CC := $(LIBTOOL) --mode=compile $(CCraw)

 # Resource compiler to use on Cygwin/MinGW, usually windres.

 #