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Commit 992387539 (build system: more clang/llvm tweaks) added a
test in scripts/Makefile.build which used the intcmp function.
This isn't present in GNU make prior to 4.4.
Rewrite the test so it works with older versions of GNU make.
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Linkers associated with clang/llvm may not support the -r option.
This is used to create built-in.o object files. It turns out that
all such files in busybox-w32 are either empty or only contain one
object file. The first case is already supported and the second
can be handled by simply copying the object file to built-in.o.
The linker is therefore never invoked with the -r option.
One adjustment is required: the workaround adopted for GitHub
issue #200 linked the dummy C file with the resource object file.
This is no longer done so only one object file is used. Since it
was the linking that broke the resource file, copying it is an
equally effective fix for the issue.
Some old linkers don't support the --warn-common option. The lack
of this option was being detected but it was still sometimes used.
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For certain cross build scenarios the LD variable is overridden
to use the gcc executive to ensure all the target tuning parameters
are used. In these cases, the executive errors out as shown below
but since this step is only linking to a .o file the standard libs
are not needed.
$ make LD=gcc applets/built-in.o
LD applets/built-in.o
/usr/bin/ld: cannot find -lgcc_s
/usr/bin/ld: cannot find -lgcc_s
collect2: ld returned 1 exit status
make[1]: *** [applets/built-in.o] Error 1
make: *** [applets_dir] Error 2
Signed-off-by: Drew Moseley <drew_moseley@mentor.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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