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From:	Mattl Mario <Mario DOT Mattl AT ssi-schaefer DOT com>
To:	"cygwin AT cygwin DOT com" <cygwin AT cygwin DOT com>
Subject:	bash-4.4.12-3: Building package with gcc-10.2 fails due to duplicate
	symbols
Thread-Topic:	bash-4.4.12-3: Building package with gcc-10.2 fails due to
	duplicate symbols
Thread-Index:	AdbTzGX/TNFhRszuS26q/K8SCTkPbA==
Date:	Wed, 16 Dec 2020 16:58:25 +0000
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Hello everyone,

With the GCC-10.2 Compiler package it's not possible to build the bash-src package anymore.

I firstly recognized the same issue with a bash-4.3 package, which we are currently using in our toolchain.
So I decided to try building the Cygwin bash-src package (of course using the common cygport mechanism for applying all patches)

gcc -L./builtins -L./lib/readline -L./lib/readline -L./lib/glob -L./lib/tilde  -L./lib/sh -L./lib/termcap    -g -O2 -Wno-parentheses -Wno-format-security -o bash.exe shell.o eval.o y.tab.o general.o make_cmd.o print_cmd.o  dispose_cmd.o execute_cmd.o variables.o copy_cmd.o error.o expr.o flags.o jobs.o subst.o hashcmd.o hashlib.o mailcheck.o trap.o input.o unwind_prot.o pathexp.o sig.o test.o version.o alias.o array.o arrayfunc.o assoc.o braces.o bracecomp.o bashhist.o bashline.o  list.o stringlib.o locale.o findcmd.o redir.o pcomplete.o pcomplib.o syntax.o xmalloc.o  -lbuiltins -lglob -lsh -lreadline -lhistory ./lib/termcap/libtermcap.a -ltilde  lib/intl/libintl.a    -ldl
/usr/lib/gcc/x86_64-pc-cygwin/10/../../../../x86_64-pc-cygwin/bin/ld: ./lib/termcap/libtermcap.a(termcap.o):/usr/src/bash-4.4.12-3.src/bash-4.4.12-3.x86_64/src/bash-4.4/lib/termcap/termcap.c:295: multiple definition of `PC'; ./lib/readline/libreadline.a(terminal.o):terminal.c:(.bss+0xa0): first defined here
/usr/lib/gcc/x86_64-pc-cygwin/10/../../../../x86_64-pc-cygwin/bin/ld: ./lib/termcap/libtermcap.a(tparam.o):/usr/src/bash-4.4.12-3.src/bash-4.4.12-3.x86_64/src/bash-4.4/lib/termcap/tparam.c:127: multiple definition of `UP'; ./lib/readline/libreadline.a(terminal.o):terminal.c:(.bss+0x90): first defined here
/usr/lib/gcc/x86_64-pc-cygwin/10/../../../../x86_64-pc-cygwin/bin/ld: ./lib/termcap/libtermcap.a(tparam.o):/usr/src/bash-4.4.12-3.src/bash-4.4.12-3.x86_64/src/bash-4.4/lib/termcap/tparam.c:126: multiple definition of `BC'; ./lib/readline/libreadline.a(terminal.o):terminal.c:(.bss+0x98): first defined here
/usr/lib/gcc/x86_64-pc-cygwin/10/../../../../x86_64-pc-cygwin/bin/ld: bashline.o:bashline.c:(.rdata$.refptr.__imp_rl_tab_insert[.refptr.__imp_rl_tab_insert]+0x0): undefined reference to `__imp_rl_tab_insert'
/usr/lib/gcc/x86_64-pc-cygwin/10/../../../../x86_64-pc-cygwin/bin/ld: bashline.o:bashline.c:(.rdata$.refptr.__imp_rl_tilde_expand[.refptr.__imp_rl_tilde_expand]+0x0): undefined reference to `__imp_rl_tilde_expand'
/usr/lib/gcc/x86_64-pc-cygwin/10/../../../../x86_64-pc-cygwin/bin/ld: bashline.o:bashline.c:(.rdata$.refptr.__imp_rl_vi_editing_mode[.refptr.__imp_rl_vi_editing_mode]+0x0): undefined reference to `__imp_rl_vi_editing_mode'
collect2: error: ld returned 1 exit status
make: *** [Makefile:573: bash.exe] Error 1


NOTE: Downgrading to GCC-9 package solves this issue.
Could you verify that issue, please?

Thanks in advance +
bR Mario


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