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This is to keep the top-level directory clean, to make it clear what is
core and what is a port, and to allow the repository to grow with new ports
in a sustainable way.
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$(TOP) is defined in py/mkenv.mk and should be used to refer to the top
level of this repository.
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The -ansi flag is used for C dialect selection and it is equivalent to -std=c90.
Because it goes right before -std=gnu99 it is ignored as for conflicting flags
GCC always uses the last one.
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Scenario: module1 depends on some common file from lib/, so specifies it
in its SRC_MOD, and the same situation with module2, then common file
from lib/ eventually ends up listed twice in $(OBJ), which leads to link
errors.
Make is equipped to deal with such situation easily, quoting the manual:
"The value of $^ omits duplicate prerequisites, while $+ retains them and
preserves their order." So, just use $^ consistently in all link targets.
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Generally, ports should inherit INC from py.mk, append to it, not
overwrite it. TODO: Likely should do the same for other vars too.
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This port supposed to be demo of uPy minimality, so let people behold it in
details.
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As we are building with -nostdlib gcc features like the stack protector
will fail linking, because the failure handlers are in gcc's internal
libs. Such features are implicitly disabled during compilation when
-nostdlib is used in CFLAGS too.
Signed-off-by: Sven Wegener <sven.wegener@stealer.net>
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-nostdlib is the correct option, gcc recognizes the double dash version
when in link-only mode, but not when compiling.
Signed-off-by: Sven Wegener <sven.wegener@stealer.net>
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Any generated headers go in $(BUILD)/genhdr/, and are #included as
'genhdr/xxx.h'.
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The autogenerated header files have been moved about, and an extra
include dir has been added, which means you can give a custom
BUILD=newbuilddir option to make, and everything "just works"
Also tidied up the way the different Makefiles build their include-
directory flags
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