Working compilation, but adding variant_dir = BUILD it doesn't work

src/api/SConscript

@@ -0,0 +1,10 @@
+# Inherit global environment
+Import('env')
+Import('symbols')
+
+# The set of source files associated with this SConscript file.
+src_local = ['kip.c', 'syscall.c', 'thread.c', 'ipc.c', 'space.c', 'mutex.c', 'capability.c']
+
+obj = env.Object(src_local)
+
+Return('obj')

src/arch/arm/SConscript

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+
+
+# Inherit global environment
+Import('env')
+
+# The set of source files associated with this SConscript file.
+src_local = ['head.S', 'vectors.S', 'syscall.S', 'exception.c']
+obj = env.Object(src_local)
+
+Return('obj')

src/arch/arm/v5/SConscript

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+
+
+# Inherit global environment
+Import('env')
+
+# The set of source files associated with this SConscript file.
+src_local = ['mm.c', 'mmu_ops.S', 'mutex.S']
+
+obj = env.Object(src_local)
+Return('obj')

src/drivers/SConscript

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+import glob
+
+Import("env", "symbols")
+
+src_local = []
+
+for name, val in symbols:
+    if "CONFIG_DRIVER_UART_PL011" == name:
+        src_local.append(glob.glob("uart/pl011/*.c"))
+    if "CONFIG_DRIVER_TIMER_SP804" == name:
+        src_local.append(glob.glob("timer/sp804/*.c"))
+    if "CONFIG_DRIVER_IRQ_PL190" == name:
+        src_local.append(glob.glob("irq/pl190/*.c"))
+
+obj = env.Object(src_local)
+
+Return('obj')

src/generic/SConscript

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+
+
+# Inherit global environment
+Import('env')
+
+# The set of source files associated with this SConscript file.
+src_local = ['irq.c', 'scheduler.c', 'time.c', 'tcb.c', 'space.c', 'bootm.c', 'resource.c', 'container.c', 'capability.c']
+
+obj = env.Object(src_local)
+Return('obj')

src/glue/arm/SConscript

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+
+
+# Inherit global environment
+Import('env')
+
+# The set of source files associated with this SConscript file.
+src_local = ['init.c', 'memory.c', 'systable.c', 'irq.c']
+
+obj = env.Object(src_local)
+Return('obj')

src/lib/SConscript

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+# Inherit global environment
+Import('env')
+Import('symbols')
+
+# The set of source files associated with this SConscript file.
+src_local = ['printk.c', 'putc.c', 'string.c', 'bit.c', 'wait.c', 'mutex.c', 'idpool.c', 'memcache.c']
+
+obj = env.Object(src_local)
+
+Return('obj')

src/platform/pb926/SConscript

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+
+
+# Inherit global environment
+Import('env')
+
+# The set of source files associated with this SConscript file.
+src_local = ['printascii.S','platform.c', 'uart.c', 'timer.c', 'irq.c']
+
+obj = env.Object(src_local)
+Return('obj')