Add a sanity check to verify that the system() command works.

Pre 2.6.23 Linux kernels have a limit on the environment size that
can be passed to a forked process. We quite easily overstep this
boundary when building big projects on Symbian, and since we depend
on running the system() command, this causes the build to fail. This
commit tests that system() can be successfully run.

1 files changed, 10 insertions, 0 deletions

diff --git a/mkspecs/symbian/linux-armcc/features/symbian_building.prf b/mkspecs/symbian/linux-armcc/features/symbian_building.prf
index 1510bfd..8f2d8a4 100644
--- a/mkspecs/symbian/linux-armcc/features/symbian_building.prf
+++ b/mkspecs/symbian/linux-armcc/features/symbian_building.prf
@@ -129,3 +129,13 @@ symbianresources.dependency_type = TYPE_C
 symbianresources.CONFIG = no_link
 
 QMAKE_EXTRA_COMPILERS += symbianresources
+
+# Pre 2.6.23 Linux kernels have a limit on the environment size that can be passed to
+# a forked process. We quite easily overstep this boundary when building big projects
+# on Symbian, and since we depend on running the system() command, this causes the build
+# to fail. Test here that system() can be successfully run. It is important that this
+# check happens as late as possible, otherwise it will not be caught.
+execve_sanity_test = $$system("echo testing")
+!contains(execve_sanity_test, "testing") {
+    error("Running system() failed. Maybe your kernel is too old? (Linux kernels need at least version 2.6.23)")
+}