[bug-gettext] [bug #56109] many autoconf tests produce wrong results with CC="gcc -flto"

[Bruno Haible]

Update of bug #56109 (project gettext):

                Severity:              3 - Normal => 2 - Minor              
                  Status:               Need Info => Confirmed              
                 Summary:        pow() test fails => many autoconf tests
produce wrong results with CC="gcc -flto"

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Follow-up Comment #19:

> I'm building everything with -Wl,--as-needed and using LTO optimisation.

The LTO optimization is the problem. And it's independent of the GCC version
and of the distribution.

$ gcc -O2 test-pow.c
/tmp/ccAF8sCL.o:(.data+0x0): undefined reference to `pow'
collect2: error: ld returned 1 exit status
$ gcc -O2 -flto test-pow.c
<no error>

To be fixed in gnulib.

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