Support cross-builds and alternative compilers with GN

Adds GN versions of the gyp_configure targets, to create custom
toolchains we can use to override compilers used by GN.

Change-Id: Ic3a9cb7e83f845180396faff632f72f9c24f3365
Reviewed-by: Michal Klocek <michal.klocek@qt.io>

1 files changed, 14 insertions, 0 deletions

diff --git a/src/buildtools/buildtools.pro b/src/buildtools/buildtools.pro
index 4ca21768e..bbf8bd610 100644
--- a/src/buildtools/buildtools.pro
+++ b/src/buildtools/buildtools.pro
@@ -8,3 +8,17 @@ use?(gn) {
     gn.depends = ninja
     SUBDIRS += gn
 }
+
+linux {
+    # configure_host.pro and configure_target.pro are phony pro files that
+    # extract things like compiler and linker from qmake.
+    # Only used on Linux as it is only important for cross-building and alternative compilers.
+    configure_host.file = configure_host.pro
+    configure_target.file = configure_target.pro
+    configure_target.depends = configure_host
+
+    use?(gn) {
+        gn.depends += configure_target
+    }
+    SUBDIRS += configure_host configure_target
+}