Configure: fix Mac OS X builds that still require makedepend

Earlier Apple Xcode compilers, e.g. one targeting Mac OS X 10.7, don't
support dependency generation and one still has to use makedepend.  It's
unclear when it was fixed, but all clang-based Apple compilers seem to
support -M options.

Reviewed-by: Andy Polyakov <appro@openssl.org>
Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/6073)

diff --git a/Configure b/Configure
index 744b493b96f648c11658af1dfa4168183a9cca6d..9c1879eaf936297b3db5fc36865750e395867e1c 100755 (executable)
--- a/Configure
+++ b/Configure
@@ -1671,6 +1671,13 @@ while (<PIPE>) {
 }
 close(PIPE);
 
+# Xcode did not handle $cc -M before clang support
+my $cc_as_makedepend = 0;
+if ($predefined{__GNUC__} >= 3 && !(defined($predefined{__APPLE_CC__})
+                                    && !defined($predefined{__clang__}))) {
+  $cc_as_makedepend = 1;
+}
+
 if ($strict_warnings)
        {
        my $wopt;
@@ -1730,14 +1737,14 @@ while (<IN>)
                s/^NM=\s*/NM= \$\(CROSS_COMPILE\)/;
                s/^RANLIB=\s*/RANLIB= \$\(CROSS_COMPILE\)/;
                s/^RC=\s*/RC= \$\(CROSS_COMPILE\)/;
-               s/^MAKEDEPPROG=.*$/MAKEDEPPROG= \$\(CROSS_COMPILE\)$cc/ if $predefined{__GNUC__} >= 3;
+               s/^MAKEDEPPROG=.*$/MAKEDEPPROG= \$\(CROSS_COMPILE\)$cc/ if $cc_as_makedepend;
                }
        else    {
                s/^CC=.*$/CC= $cc/;
                s/^AR=\s*ar/AR= $ar/;
                s/^RANLIB=.*/RANLIB= $ranlib/;
                s/^RC=.*/RC= $windres/;
-               s/^MAKEDEPPROG=.*$/MAKEDEPPROG= $cc/ if $predefined{__GNUC__} >= 3;
+               s/^MAKEDEPPROG=.*$/MAKEDEPPROG= $cc/ if $cc_as_makedepend;
                }
        s/^CFLAG=.*$/CFLAG= $cflags/;
        s/^DEPFLAG=.*$/DEPFLAG=$depflags/;