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Date: Sun, 26 Nov 2017 16:03:01 +0100
From: "Juan Manuel Guerrero (juan DOT guerrero AT gmx DOT de) [via djgpp AT delorie DOT com]" <djgpp AT delorie DOT com>
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To: djgpp AT delorie DOT com
Subject: Linker error due to multiple symbol definitions when compiling gdb
 8.0.1 using gcc720
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Reply-To: djgpp AT delorie DOT com

I am trying to compile gdb-8.0.1.  Very unfortunately it requires to use of
a c++ compiler that provides C++11 support.  I have tried gcc640 and gcc720
and now I get linker problemes because certain symbols are provided twice.
One time by libstdcxx.a and a second time by gdb's own build-gnulib/import/libgnu.a.
The symbol is frexpl but there may be a lot mores.  This function is neither
provided by libc nor by libm.a.  It seems to be that the gpp port thus
provides some substitution for this function and probably for a lot of
other missing ones.  Now the question arises, why this is not recognized
by the configure script?  If the possibility exists that a compiler extends
the existing headers and libraries, why this is not found by the configure
script?  Is there something wrong with the gpp installation so that
certain paths are not updated and thus not seen later by the configure
script?  Must djgpp.env be adjust to automatically reflect the special
headers provided by the c++ compiler?

Of course, all this is not really a problem.  The configure script can
always be adjusted to ignore the gnulib version and to use the one
provided by the compiler.  But the configuration error will continue
in other packages that will also need to get theit configure script
adjusted accortdingly.


Regards,
Juan M. Guerrero