From ec4ceb632abc0d54061269bc779459e13172f264 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Petr=20P=C3=ADsa=C5=99?= <ppisar@redhat.com>
Date: Thu, 23 Jan 2020 15:42:41 +0100
Subject: [PATCH 1/2] Fix building with GCC 10
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GCC 10 defaults to -fno-common that results into errors on multiple
global variable definitions:

/usr/lib64/gcc/x86_64-suse-linux/9/../../../../x86_64-suse-linux/bin/ld:
shar-opts.o:(.data.rel.ro.local+0x0): multiple definition of
`program_name'; shar.o:(.rodata+0x10): first defined here

This patch fixes it by changing the definitions in header files into extern
declarations.

<https://lists.gnu.org/archive/html/bug-gnu-utils/2020-01/msg00001.html>

Signed-off-by: Petr Písař <ppisar@redhat.com>
---
 src/shar-opts.h     | 2 +-
 src/shar-std.def    | 2 +-
 src/unshar-opts.h   | 2 +-
 src/uudecode-opts.h | 2 +-
 src/uuencode-opts.h | 2 +-
 5 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/src/shar-opts.h b/src/shar-opts.h
index 75dcae2..5055d1c 100644
--- a/src/shar-opts.h
+++ b/src/shar-opts.h
@@ -352,7 +352,7 @@ extern "C" {
  *  global exported definitions
  */
 #include "local.h"
-char const * const program_name;
+extern char const * const program_name;
 
 extern bool initialization_done;
 extern int optidx;
diff --git a/src/shar-std.def b/src/shar-std.def
index ed06b77..a28f61c 100644
--- a/src/shar-std.def
+++ b/src/shar-std.def
@@ -41,7 +41,7 @@ no-misuse-usage;
 usage-message;
 die-code;
 
-export  = '#include "local.h"'"\nchar const * const program_name;";
+export  = '#include "local.h"'"\nextern char const * const program_name;";
 
 #shell
 echo "include = 'char const * const program_name = \"${progname}\";';"
diff --git a/src/unshar-opts.h b/src/unshar-opts.h
index 2c3febe..9ebe2fc 100644
--- a/src/unshar-opts.h
+++ b/src/unshar-opts.h
@@ -192,7 +192,7 @@ extern "C" {
 extern size_t       separator_str_len;
 
 #include "local.h"
-char const * const program_name;
+extern char const * const program_name;
 
 
 /* * * * * *
diff --git a/src/uudecode-opts.h b/src/uudecode-opts.h
index 29b3b5c..5494289 100644
--- a/src/uudecode-opts.h
+++ b/src/uudecode-opts.h
@@ -170,7 +170,7 @@ extern "C" {
  *  global exported definitions
  */
 #include "local.h"
-char const * const program_name;
+extern char const * const program_name;
 
 
 /* * * * * *
diff --git a/src/uuencode-opts.h b/src/uuencode-opts.h
index e71c9b8..d6ec03e 100644
--- a/src/uuencode-opts.h
+++ b/src/uuencode-opts.h
@@ -166,7 +166,7 @@ extern "C" {
  *  global exported definitions
  */
 #include "local.h"
-char const * const program_name;
+extern char const * const program_name;
 
 
 /* * * * * *
-- 
2.21.1