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Configure: use a better method to identify gcc and derivates

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Looking for 'gcc' and 'clang' in the output from the C compiler is
uncertain.  Some versions report argv[0], which might be /usr/bin/cc
(for example), and others might mention gcc without being gcc or a
derivate.

Better then to fetch predefined macros and checking if __GNUC__ and
__clang__ are defined.

Reviewed-by: Andy Polyakov <appro@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/4755)
This commit is contained in:
Richard Levitte 2017-11-18 17:54:57 +01:00
parent 8d8d903118
commit 78e9e3f945
1 changed files with 14 additions and 8 deletions

22
Configure

@ -1269,7 +1269,7 @@ my ($prelflags,$postlflags)=split('%',$lflags);
if (defined($postlflags)) { $lflags=$postlflags; }
else { $lflags=$prelflags; undef $prelflags; }
if ($target =~ /^mingw/ && `$cc --target-help 2>&1` !~ m/\-mno\-cygwin/m)
if ($target =~ /^mingw/ && `$cross_compile_prefix$cc --target-help 2>&1` !~ m/\-mno\-cygwin/m)
{
$cflags =~ s/\-mno\-cygwin\s*//;
$shared_ldflag =~ s/\-mno\-cygwin\s*//;
@ -1661,18 +1661,25 @@ if ($shlib_version_number =~ /(^[0-9]*)\.([0-9\.]*)/)
$shlib_minor=$2;
}
my $ecc = $cc;
$ecc = "clang" if `$cc --version 2>&1` =~ /clang/;
my %predefined;
# collect compiler pre-defines from gcc or gcc-alike...
open(PIPE, "$cross_compile_prefix$cc -dM -E -x c /dev/null 2>&1 |");
while (<PIPE>) {
m/^#define\s+(\w+(?:\(\w+\))?)(?:\s+(.+))?/ or last;
$predefined{$1} = defined($2) ? $2 : "";
}
close(PIPE);
if ($strict_warnings)
{
my $wopt;
die "ERROR --strict-warnings requires gcc or clang" unless ($ecc =~ /gcc$/ or $ecc =~ /clang$/);
die "ERROR --strict-warnings requires gcc or clang" unless defined($predefined{__GNUC__});
foreach $wopt (split /\s+/, $gcc_devteam_warn)
{
$cflags .= " $wopt" unless ($cflags =~ /(^|\s)$wopt(\s|$)/)
}
if ($ecc eq "clang")
if (defined($predefined{__clang__}))
{
foreach $wopt (split /\s+/, $clang_devteam_warn)
{
@ -1723,15 +1730,14 @@ 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 $cc eq "gcc";
s/^MAKEDEPPROG=.*$/MAKEDEPPROG= \$\(CROSS_COMPILE\)$cc/ if $predefined{__GNUC__} >= 3;
}
else {
s/^CC=.*$/CC= $cc/;
s/^AR=\s*ar/AR= $ar/;
s/^RANLIB=.*/RANLIB= $ranlib/;
s/^RC=.*/RC= $windres/;
s/^MAKEDEPPROG=.*$/MAKEDEPPROG= $cc/ if $cc eq "gcc";
s/^MAKEDEPPROG=.*$/MAKEDEPPROG= $cc/ if $ecc eq "gcc" || $ecc eq "clang";
s/^MAKEDEPPROG=.*$/MAKEDEPPROG= $cc/ if $predefined{__GNUC__} >= 3;
}
s/^CFLAG=.*$/CFLAG= $cflags/;
s/^DEPFLAG=.*$/DEPFLAG=$depflags/;