./configure with CC="ccache gcc" doesn't work

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+From: Andy Wingo <wingo@oblong.com>\r
+To: notmuch@notmuchmail.org\r
+Subject: ./configure with CC="ccache gcc" doesn't work\r
+Date: Wed, 19 Jan 2011 17:24:57 +0100\r
+Message-ID: <m3ei8897za.fsf@oblong.com>\r
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+\r
+Hello,\r
+\r
+On my Fedora 13 x86-64 system,\r
+\r
+    $ env | grep CC\r
+    CC=3Dccache gcc\r
+    $ ./configure --prefix=3D/usr --libdir=3D/usr/lib64\r
+    [...]\r
+    Checking for getline... No (will use our own instead).\r
+    Checking for strcasestr... No (will use our own instead).\r
+    Checking for rpath support... No (nothing to worry about).\r
+    Checking for -Wl,--as-needed... No (nothing to worry about).\r
+    [... success ...]\r
+\r
+The replacement strcasestr later causes build errors:\r
+\r
+    CXX -O2 lib/directory.o\r
+    In file included from lib/notmuch-private.h:41,\r
+                     from lib/directory.cc:22:\r
+    /usr/include/string.h:371: error: new declaration =E2=80=98const char* =\r
+strcasestr(const char*, const char*)=E2=80=99\r
+    compat/compat.h:46: error: ambiguates old declaration =E2=80=98char* st=\r
+rcasestr(const char*, const char*)=E2=80=99\r
+\r
+But if I export CC=3Dgcc, things succeed:\r
+\r
+    Checking for getline... Yes.\r
+    Checking for strcasestr... Yes.\r
+    Checking for rpath support... Yes.\r
+\r
+And the build goes fine.\r
+\r
+I think the problem occurs due to the IFS setting in configure.  Not\r
+sure what the right solution is; I am not married to having ccache in the\r
+environment.  It's simply that this is what has worked in the past.  If\r
+there is a better option for using ccache I'm happy to switch, as long\r
+as it's globally applicable.\r
+\r
+Happy hacking,\r
+\r
+Andy\r