Re: grep-3.0-2 issues within Makefile

[Brian Inglis <Brian.Inglis@SystematicSw.ab.ca>]

On 2017-05-29 05:44, Eric Blake wrote:
> On 05/29/2017 06:39 AM, Eric Blake wrote:
>>>> localsyms: libtcctmp.o
>>>>     @$(READELF) $< -Ws | $(AWK) "{print \$$8}" | sort | uniq \
>> Most likely, $(READELF) is producing \r\n-terminated output.
> That said, WHAT is $(READELF) actually expanding to? If it is the cygwin
> binutils version, it should NOT be outputting \r\n in the first place.
> Generally, you don't get \r\n output unless you are mixing non-cygwin
> programs into the pipeline.

Cygwin .o files are not ELF format and not recognized as such by readelf

$ readelf src/astro/sofa/20160503_a/c/build/zr.o -Ws
readelf: Error: Not an ELF file - it has the wrong magic bytes at the start

or file

$ file src/astro/sofa/20160503_a/c/build/zr.o
src/astro/sofa/20160503_a/c/build/zr.o: data

running Cygwin readelf on cross builds which produce ELF .o don't
generate "\r":

$ file util/*.o
util/ntp-keygen.o:      ELF 32-bit LSB relocatable, ARM, EABI5 version 1
(SYSV), not stripped, with debug_info
util/ntp-keygen-opts.o: ELF 32-bit LSB relocatable, ARM, EABI5 version 1
(SYSV), not stripped, with debug_info
util/ntptime.o:         ELF 32-bit LSB relocatable, ARM, EABI5 version 1
(SYSV), not stripped, with debug_info
util/tickadj.o:         ELF 32-bit LSB relocatable, ARM, EABI5 version 1
(SYSV), not stripped, with debug_info
util/version.o:         ELF 32-bit LSB relocatable, ARM, EABI5 version 1
(SYSV), not stripped, with debug_info

$ readelf util/*.o -Ws | wc -lwcL
    460    3479   26678      84
$ readelf util/*.o -Ws | grep $'\r' | wc -lwcL
      0       0       0       0

and it's not the Cygwin mingw binutils

$ /usr/bin/x86_64-w64-mingw32-readelf util/*.o -Ws | grep $'\r' | wc -lwcL
      0       0       0       0

and just to prove this detects "\r"

$ echo $'\r' | grep $'\r' | wc -lwcL
      1       0       2       0

so culprit must be native Mingw binutils readelf.

-- 
Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada

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