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-rw-r--r--make/custom/Linux-posix.cfg2
1 files changed, 2 insertions, 0 deletions
diff --git a/make/custom/Linux-posix.cfg b/make/custom/Linux-posix.cfg
index 5c9279ecc7..91e21283df 100644
--- a/make/custom/Linux-posix.cfg
+++ b/make/custom/Linux-posix.cfg
@@ -14,6 +14,8 @@ RTEMS_BSP_FAMILY=posix
include $(RTEMS_ROOT)/make/custom/default.cfg
+# This contains the compiler options necessary to select the CPU model
+# and (hopefully) optimize for it.
CPU_CFLAGS = -D_BSD_SOURCE -D_POSIX_C_SOURCE
# optimize flag: typically -O2