pkg-autotools: generic configure fix for powerpc64

Many (100+) packages supported by buildroot contain old configure
scripts (or build them from old versions of autotools) that are unable
to determine how to link shared libraries on powerpc64 and
powerpc64le. This causes that test to erroneously fail on toolchains
that are not "bi-endian" (which is the case for toolchains built by
buildroot), which causes configure to build static libraries instead
of dynamic ones. Although these builds succeed, they tend to cause
linker failures in binaries later linked against them.

Because affected configure files can be discovered automatically, this
patch introduces a hook (enabled only when building for powerpc64 and
powerpc64le) that uses a script to scan and fix each package.

Signed-off-by: Sam Bobroff <sam.bobroff@au1.ibm.com>
Reviewed-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

1 files changed, 47 insertions, 0 deletions

diff --git a/support/scripts/fix-configure-powerpc64.sh b/support/scripts/fix-configure-powerpc64.sh
new file mode 100755
index 000000000..ad710422a
--- /dev/null
+++ b/support/scripts/fix-configure-powerpc64.sh
@@ -0,0 +1,47 @@
+#!/bin/bash
+
+# This is a script to find, and correct, a problem with old versions of
+# configure that affect powerpc64 and powerpc64le.
+
+# The issue causes configure to incorrectly determine that shared library
+# support is not present in the linker. This causes the package to build a
+# static library rather than a dynamic one and although the build will succeed,
+# it may cause packages that link with the static library it to fail due to
+# undefined symbols.
+
+# This script searches for files named 'configure' that appear to have this
+# issue (by searching for a known bad pattern) and patching them.
+
+set -e
+
+if [ $# -ne 1 ]; then
+	echo "Usage: $0 <package build directory>"
+	exit 2
+fi
+
+srcdir="$1"
+files=$(cd "$srcdir" && find . -name configure \
+-exec grep -qF 'Generated by GNU Autoconf' {} \; \
+-exec grep -qF 'ppc*-*linux*|powerpc*-*linux*)' {} \; -print)
+
+# --ignore-whitespace is needed because some packages have included
+# copies of configure scripts where tabs have been replaced with spaces.
+for c in $files; do
+	patch --ignore-whitespace "$srcdir"/"$c" <<'EOF'
+--- a/configure	2016-11-16 15:31:46.097447271 +1100
++++ b/configure	2008-07-21 12:17:23.000000000 +1000
+@@ -4433,7 +4433,10 @@
+         x86_64-*linux*)
+           LD="${LD-ld} -m elf_x86_64"
+           ;;
+-        ppc*-*linux*|powerpc*-*linux*)
++	  powerpcle-*linux*)
++	    LD="${LD-ld} -m elf64lppc"
++	    ;;
++	  powerpc-*linux*)
+           LD="${LD-ld} -m elf64ppc"
+           ;;
+         s390*-*linux*)
+EOF
+done
+