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-rw-r--r--Makeconfig9
1 files changed, 8 insertions, 1 deletions
diff --git a/Makeconfig b/Makeconfig
index 04d7588062..49c5a81a20 100644
--- a/Makeconfig
+++ b/Makeconfig
@@ -765,11 +765,18 @@ endif # $(+cflags) == ""
# Don't duplicate options if we inherited variables from the parent.
+cflags := $(sort $(+cflags))
+# Each sysdeps directory can contain header files that both will be
+# used to compile and will be installed. Each can also contain an
+# include/ subdirectory, whose header files will be used to compile
+# but will not be installed, and will take precedence over the
+# installed files. This mirrors the top-level include/ subdirectory.
++sysdep-includes := $(foreach dir,$(+sysdep_dirs),\
+ $(addprefix -I,$(wildcard $(dir)/include) $(dir)))
+
# These are flags given to the C compiler to tell it to look for
# include files (including ones given in angle brackets) in the parent
# library source directory, in the include directory, and in the
# current directory.
-+sysdep-includes = $(addprefix -I,$(+sysdep_dirs))
+includes = -I$(..)include $(if $(subdir),$(objpfx:%/=-I%)) \
$(+sysdep-includes) $(includes) \
$(patsubst %/,-I%,$(..)) $(libio-include) -I. $(sysincludes)