[issue20767] Some python extensions can't be compiled with clang 3.4

[Antoine Brodin.FreeBSD]

New submission from Antoine Brodin.FreeBSD:

Hi,

On FreeBSD -current,  clang 3.4 is now the default compiler.
Clang 3.4 rejects "-R/path/to/lib" flag (previously in version 3.3 it just ignored it).

This leads to some errors with some python extensions:

cc -shared -O2 -pipe -fno-strict-aliasing build/temp.freebsd-11.0-CURRENT-amd64-2.7/_sqlite/cache.o build/temp.freebsd-11.0-CURRENT-amd64-2.7/_sqlite/connection.o build/temp.freebsd-11.0-CURRENT-amd64-2.7/_sqlite/cursor.o build/temp.freebsd-11.0-CURRENT-amd64-2.7/_sqlite/microprotocols.o build/temp.freebsd-11.0-CURRENT-amd64-2.7/_sqlite/module.o build/temp.freebsd-11.0-CURRENT-amd64-2.7/_sqlite/prepare_protocol.o build/temp.freebsd-11.0-CURRENT-amd64-2.7/_sqlite/row.o build/temp.freebsd-11.0-CURRENT-amd64-2.7/_sqlite/statement.o build/temp.freebsd-11.0-CURRENT-amd64-2.7/_sqlite/util.o -L/usr/local/lib -R/usr/local/lib -lsqlite3 -o build/lib.freebsd-11.0-CURRENT-amd64-2.7/_sqlite3.so
cc: error: unknown argument: '-R/usr/local/lib'
error: command 'cc' failed with exit status 1


cc -shared -O2 -pipe -DLDAP_DEPRECATED -fno-strict-aliasing build/temp.freebsd-11.0-CURRENT-amd64-2.7/Modules/LDAPObject.o build/temp.freebsd-11.0-CURRENT-amd64-2.7/Modules/ldapcontrol.o build/temp.freebsd-11.0-CURRENT-amd64-2.7/Modules/common.o build/temp.freebsd-11.0-CURRENT-amd64-2.7/Modules/constants.o build/temp.freebsd-11.0-CURRENT-amd64-2.7/Modules/errors.o build/temp.freebsd-11.0-CURRENT-amd64-2.7/Modules/functions.o build/temp.freebsd-11.0-CURRENT-amd64-2.7/Modules/schema.o build/temp.freebsd-11.0-CURRENT-amd64-2.7/Modules/ldapmodule.o build/temp.freebsd-11.0-CURRENT-amd64-2.7/Modules/message.o build/temp.freebsd-11.0-CURRENT-amd64-2.7/Modules/version.o build/temp.freebsd-11.0-CURRENT-amd64-2.7/Modules/options.o build/temp.freebsd-11.0-CURRENT-amd64-2.7/Modules/berval.o -L/usr/local/lib -L/usr/lib -R/usr/local/lib -R/usr/lib -lldap_r -o build/lib.freebsd-11.0-CURRENT-amd64-2.7/_ldap.so
cc: error: unknown argument: '-R/usr/local/lib'
cc: error: unknown argument: '-R/usr/lib'
error: command 'cc' failed with exit status 1


cc -shared -O2 -pipe -fno-strict-aliasing build/temp.freebsd-11.0-CURRENT-amd64-2.7/Modules/_bsddb.o -L/usr/local/lib -R/usr/local/lib -o build/lib.freebsd-11.0-CURRENT-amd64-2.7/bsddb3/_pybsddb.so -ldb-4.3
cc: error: unknown argument: '-R/usr/local/lib'
error: command 'cc' failed with exit status 1


I found the patch below to help, it is for function runtime_library_dir_option in Lib/distutils/unixccompiler.py
-Wl,-rpath works for both gcc and clang on freebsd

--- ./Lib/distutils/unixccompiler.py.orig
+++ ./Lib/distutils/unixccompiler.py
@@ -228,6 +228,8 @@
         if sys.platform[:6] == "darwin":
             # MacOSX's linker doesn't understand the -R flag at all
             return "-L" + dir
+        elif sys.platform[:7] == "freebsd":
+            return "-Wl,-rpath=" + dir
         elif sys.platform[:5] == "hp-ux":
             if self._is_gcc(compiler):
                 return ["-Wl,+s", "-L" + dir]

----------
components: Distutils
messages: 212176
nosy: Antoine.Brodin.FreeBSD, koobs
priority: normal
severity: normal
status: open
title: Some python extensions can't be compiled with clang 3.4
versions: Python 2.7

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue20767>
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