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[bug #59096] The built in rule for archives fails on aix.

From: Dmitry Goncharov
Subject: [bug #59096] The built in rule for archives fails on aix.
Date: Thu, 10 Sep 2020 19:40:33 -0400 (EDT)
User-agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.102 Safari/537.36


                 Summary: The built in rule for archives fails on aix.
                 Project: make
            Submitted by: dgoncharov
            Submitted on: Чт 10 сен 2020 23:40:31
                Severity: 3 - Normal
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
       Component Version: None
        Operating System: None
           Fixed Release: None
           Triage Status: None



$ cat makefile
all: libhello.a(a.o)
%.o: %.c
        $(CC) -c -maix64 $<
        echo 'static int a;' >$@
$ make
gcc -c -maix64 a.c
ar rv libhello.a a.o
ar: Creating an archive file libhello.a.
a - a.o
ar: 0707-126 a.o is not valid with the current object file mode.
        Use the -X option to specify the desired object mode.
<builtin>: recipe for target 'libhello.a(a.o)' failed
make: *** [libhello.a(a.o)] Error 1
rm a.o

Aix ar requires an option to specify the object file format.

Quote from

"-X mode        Specifies the type of object file ar should examine. The mode 
must be
one of the following:
Processes only 32-bit object files
Processes only 64-bit object files
Processes both 32-bit and 64-bit object files
Examines discontinued 64-bit XCOFF files (magic number == U803XTOCMAGIC).
Processes all of the supported object files.
The default is to process 32-bit object files (ignore 64-bit objects). The
mode can also be set with the OBJECT_MODE environment variable. For example,
OBJECT_MODE=64 causes ar to process any 64-bit objects and ignore 32-bit
objects. The -X flag overrides the OBJECT_MODE variable."


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