makepkg: add support for CARCH environment var

Add support for overriding configuration in /etc/makepkg.conf and
~/.makepkg.conf by setting the environment variable CARCH similar to
how SRCDEST and PKGDEST behave.

Fixes FS#35030.

Signed-off-by: Allan McRae <allan@archlinux.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/doc/makepkg.8.txt b/doc/makepkg.8.txt
index a10242d2..e24463c2 100644
--- a/doc/makepkg.8.txt
+++ b/doc/makepkg.8.txt
@@ -229,6 +229,10 @@ Environment Variables
 	Folder where the package will be built. Overrides the corresponding
 	value defined in linkman:makepkg.conf[5].
 
+**CARCH=**"(i686|x86_64)"::
+	Force build for a specific architecture. Useful for cross-compiling.
+	Overrides the corresponding value defined in linkman:makepkg.conf[5].
+
 Configuration
 -------------
 See linkman:makepkg.conf[5] for more details on configuring makepkg using the