[PATCH v2] newlib: libc: merge build up a directory

[Mike Frysinger]

On 14 Mar 2022 23:04, Mike Frysinger wrote:
> Convert all the libc/ subdir makes into the top-level Makefile.  This
> allows us to build all of libc from the top Makefile without using any
> recursive make calls.  This is faster and avoids the funky lib.a logic
> where we unpack subdir archives to repack into a single libc.a.  The
> machine override logic is maintained though by way of Makefile include
> ordering, and source file accumulation in libc_a_SOURCES.
> 
> There's a few dummy.c files that are no longer necessary since we aren't
> doing the lib.a accumulating, so punt them.
> ---
> v2
> - fix some bad paths & compiler settings & missing \ in stdio subdirs

i also pushed this to topic/vapier-libc if you want to fetch that to test.

i checked against these targets:
aarch64-elf arc-elf arm-eabi
bfin-elf
cr16-elf cris-elf csky-elf
epiphany-elf
frv-elf
h8300-elf
i386-elf i686-pc-cygwin iq2000-elf
lm32-elf
m68k-elf microblaze-elf mips-elf mn10300-elf moxie-elf
nds32le-elf
or1k-elf
powerpc-elf
sparc-elf sparc-rtems
v850e-elf visium-elf
x86_64-pc-cygwin xstormy16-elf

i checked the newlib object lists to make sure they matched and the
disassembly was the same between them.  there were some changes, but
they were expected: no longer including dummy.o, and for some ports,
using libc_a- prefix on the objects.

cygwin newlib works, but winsup breaks because it has a direct
reference on an internal lib.a file that no longer exists:
libssp.a: $(LIB_NAME) $(newlib_build)/libc/ssp/lib.a
	$(AM_V_GEN)$(speclib) $^ $(@F)

i could fix it like so:

--- a/winsup/cygwin/Makefile.am
+++ b/winsup/cygwin/Makefile.am
@@ -719,7 +719,7 @@
 libacl.a: $(LIB_NAME) sec_posixacl.o
 	$(AM_V_GEN)$(speclib) $^ $(@F)
 
-libssp.a: $(LIB_NAME) $(newlib_build)/libc/ssp/lib.a
+libssp.a: $(LIB_NAME) $(wildcard $(newlib_build)/libc/ssp/*.o)
 	$(AM_V_GEN)$(speclib) $^ $(@F)
 
 #

not sure what the preference is here.
-mike
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