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Check gcc version to see if it supports -MM and friends 

According to manuals found here: https://gcc.gnu.org/onlinedocs/, GNU
C version 3 and on support the dependency generation options.  We
therefore need to check the gcc version to see if we're going to use
it or makedepend for dependency generation.

Reviewed-by: Andy Polyakov <appro@openssl.org>
This commit is contained in:
Richard Levitte 2016-03-08 17:16:16 +01:00
parent dca5c70121
commit 30752dd7df
1 changed files with 5 additions and 1 deletions
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6
Configure
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@ -1104,7 +1104,11 @@ if ($^O ne "VMS" && !$disabled{makedepend}) {
$config{makedepprog} = which('makedepend');
open(PIPE, "$ccpcc --version 2>&1 | head -2 |");
while ( <PIPE> ) {
$config{makedepprog} = $ccpcc if /clang|gcc/;
# Find the version number and save the major.
m|(?:.*)\b(\d+)\.\d+\.\d+\b(?:.*)|;
# We know that GNU C version 3 and up as well as all clang
# versions support dependency generation
$config{makedepprog} = $ccpcc if /clang/ || (/gcc/ && $1 > 3);
$ecc = "clang" if /clang/;
$ecc = "gcc" if /gcc/;
}