[Reproducible-commits] [debhelper] 05/05: Add cross-compile support to the cmake build system

[Mattia Rizzolo]

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mapreri-guest pushed a commit to branch master
in repository debhelper.

commit 23a66fd8787fad005446c25e02a4ed66134b446c
Author: Helmut Grohne <helmut at subdivi.de>
Date:   Wed Aug 12 17:15:09 2015 +0200

    Add cross-compile support to the cmake build system
    
    [nthykier: Minor style changes/refactoring]
    
    Signed-off-by: Niels Thykier <niels at thykier.net>
---
 Debian/Debhelper/Buildsystem/cmake.pm | 28 +++++++++++++++++++++++++++-
 debian/changelog                      |  3 +++
 2 files changed, 30 insertions(+), 1 deletion(-)

diff --git a/Debian/Debhelper/Buildsystem/cmake.pm b/Debian/Debhelper/Buildsystem/cmake.pm
index 9646d4b..f778c6d 100644
--- a/Debian/Debhelper/Buildsystem/cmake.pm
+++ b/Debian/Debhelper/Buildsystem/cmake.pm
@@ -8,9 +8,15 @@ package Debian::Debhelper::Buildsystem::cmake;
 
 use strict;
 use warnings;
-use Debian::Debhelper::Dh_Lib qw(compat);
+use Debian::Debhelper::Dh_Lib qw(compat dpkg_architecture_value error is_cross_compiling);
 use parent qw(Debian::Debhelper::Buildsystem::makefile);
 
+my %DEB_HOST2CMAKE_SYSTEM = (
+	'linux'    => 'Linux',
+	'kfreebsd' => 'FreeBSD',
+	'hurd'     => 'GNU',
+);
+
 sub DESCRIPTION {
 	"CMake (CMakeLists.txt)"
 }
@@ -46,6 +52,26 @@ sub configure {
 	push @flags, "-DCMAKE_VERBOSE_MAKEFILE=ON";
 	push @flags, "-DCMAKE_BUILD_TYPE=None";
 
+	if (is_cross_compiling()) {
+		my $deb_host = dpkg_architecture_value("DEB_HOST_ARCH_OS");
+		if (my $cmake_system = $DEB_HOST2CMAKE_SYSTEM{$deb_host}) {
+			push(@flags, "-DCMAKE_SYSTEM_NAME=${cmake_system}");
+		} else {
+			error("Cannot cross-compile - CMAKE_SYSTEM_NAME not known for ${deb_host}");
+		}
+		push @flags, "-DCMAKE_SYSTEM_PROCESSOR=" . dpkg_architecture_value("DEB_HOST_GNU_CPU");
+		if ($ENV{CC}) {
+			push @flags, "-DCMAKE_C_COMPILER=" . $ENV{CC};
+		} else {
+			push @flags, "-DCMAKE_C_COMPILER=" . dpkg_architecture_value("DEB_HOST_GNU_TYPE") . "-cc";
+		}
+		if ($ENV{CXX}) {
+			push @flags, "-DCMAKE_CXX_COMPILER=" . $ENV{CXX};
+		} else {
+			push @flags, "-DCMAKE_CXX_COMPILER=" . dpkg_architecture_value("DEB_HOST_GNU_TYPE") . "-c++";
+		}
+	}
+
 	# CMake doesn't respect CPPFLAGS, see #653916.
 	if ($ENV{CPPFLAGS} && ! compat(8)) {
 		$ENV{CFLAGS}   .= ' ' . $ENV{CPPFLAGS};
diff --git a/debian/changelog b/debian/changelog
index 2cfd1a1..e4d0e5c 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -2,6 +2,9 @@ debhelper (9.20150811+unreleased) UNRELEASED; urgency=medium
 
   * dh/dh_auto_*: Apply patch from "Dhole" to define
     SOURCE_DATE_EPOCH.  (Closes: #791823)
+  * cmake.pm: Add better cross-compile support for cmake.
+    Heavily based on a patch from Helmut Grohne.
+    (Closes: #794396)
 
  -- Niels Thykier <niels at thykier.net>  Wed, 12 Aug 2015 10:46:59 +0200
 

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