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From f6bc8fb3d26892ba1a84ba2df76beedd51998dd2 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Petr=20P=C3=ADsa=C5=99?= <ppisar@redhat.com>
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Date: Mon, 29 Jan 2018 16:34:17 +0100
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Subject: [PATCH] hints/linux: Add -lphtread to lddlflags
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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Passing -z defs to linker flags causes perl to fail to build if threads are
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enabled:
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gcc -shared -Wl,-z,relro -Wl,-z,defs -specs=/usr/lib/rpm/redhat/redhat-hardened-ld -L/usr/local/lib -fstack-protector-strong Bzip2.o -o ../../lib/auto/Compress/Raw/Bzip2/Bzip2.so \
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-L/usr/lib64 -lbz2 "-L../.." -lperl \
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Bzip2.o: In function `deRef':
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/builddir/build/BUILD/perl-5.26.1/cpan/Compress-Raw-Bzip2/Bzip2.xs:256: undefined reference to `pthread_getspecific'
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The reason is Bzip2.xs calls dTHX macro included from thread.h via perl.h that
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expands to pthread_getspecific() function call that is defined in pthread
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library. But the pthread library is not explicitly linked to Bzip.so (see the
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gcc command). This is exactly what -z defs linker flag enforces.
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Underlinking ELFs can be dangerous because in case of versioned
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symbols it can cause run-time binding to an improper version symbol or
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even to an symbold from different library.
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This patch fixes hints for Linux by adding -lpthreads to lddlflags. It
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also adds -shared there because Configure.sh adds it only hints return
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lddlflags empty.
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<https://lists.fedoraproject.org/archives/list/devel@lists.fedoraproject.org/message/3RHZEHLRUHJFF2XGHI5RB6YPDNLDR4HG/>
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Signed-off-by: Petr Písař <ppisar@redhat.com>
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---
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hints/linux.sh | 4 ++++
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1 file changed, 4 insertions(+)
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diff --git a/hints/linux.sh b/hints/linux.sh
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index 3f38ea07f1..9ec3bc02ef 100644
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--- a/hints/linux.sh
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+++ b/hints/linux.sh
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@@ -353,12 +353,16 @@ if [ -f /etc/synoinfo.conf -a -d /usr/syno ]; then
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echo "$libswanted" >&4
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fi
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+# Flags needed to produce shared libraries.
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+lddlflags='-shared'
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+
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# This script UU/usethreads.cbu will get 'called-back' by Configure
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# after it has prompted the user for whether to use threads.
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cat > UU/usethreads.cbu <<'EOCBU'
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case "$usethreads" in
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$define|true|[yY]*)
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ccflags="-D_REENTRANT -D_GNU_SOURCE $ccflags"
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+ lddlflags="-lpthread $lddlflags"
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if echo $libswanted | grep -v pthread >/dev/null
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then
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set `echo X "$libswanted "| sed -e 's/ c / pthread c /'`
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--
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2.13.6
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