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GNU ld and gold have supported --print-output-format since 2011. glibc
requires binutils>=2.25 (2015), so if LD is GNU ld or gold, we can
assume the option is supported.
lld is by default a cross linker supporting multiple targets. It auto
detects the file format and does not need OUTPUT_FORMAT. It does not
support --print-output-format.
By parsing objdump -f, we can support all the three linkers.
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
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* scripts/output-format.sed: Handle default case of three-argument
OUTPUT_FORMAT.
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* scripts/output-format.sed: Fix bug in one of the s expressions
which used / for one too many things.
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* Makerules ($(common-objpfx)format.lds): New target.
(common-generated): Add it.
($(inst_libdir)/libc.so): Depend on that, and cat it into the result.
* scripts/output-format.sed: New file.
* Makefile (distribute): Add it.
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