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Revert "gnu: gcc: Add '-lgcc_s' only when '-pthread' is given."

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This reverts commit 9097e666d4.

This turned out not to be a good strategy.  Some build system, e.g. tcl's, do
not pass -pthread on GNU/Linux by default, but merely link with -lpthread.
Also, Ludovic found other cases where libgcc_s is dlopened by libc that have
nothing to do with pthreads, e.g. to walk the stack.
This commit is contained in:
Mark H Weaver 2015-01-07 09:51:23 -05:00
parent b515822de1
commit fa1e2f3d0d
1 changed files with 6 additions and 8 deletions
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14
gnu/packages/gcc.scm
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@ -1,6 +1,5 @@
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2012, 2013, 2014 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2015 Mark H Weaver <mhw@netris.org>
;;;
;;; This file is part of GNU Guix.
;;;
@ -202,15 +201,14 @@ (define-public gcc-4.7
(substitute* (find-files "gcc/config"
"^gnu-user.*\\.h$")
(("#define GNU_USER_TARGET_LIB_SPEC (.*)$" _ suffix)
;; Help libgcc_s.so be found (see also below.) When
;; -pthread is given, use '-lgcc_s' so that libgcc_s.so is
;; always found by those programs that use 'pthread_cancel'
;; (glibc dlopens libgcc_s.so when pthread_cancel support
;; is needed, but having it in the application's RUNPATH
;; isn't enough; see
;; Help libgcc_s.so be found (see also below.) Always use
;; '-lgcc_s' so that libgcc_s.so is always found by those
;; programs that use 'pthread_cancel' (glibc dlopens
;; libgcc_s.so when pthread_cancel support is needed, but
;; having it in the application's RUNPATH isn't enough; see
;; <http://sourceware.org/ml/libc-help/2013-11/msg00023.html>.)
(format #f "#define GNU_USER_TARGET_LIB_SPEC \
\"-L~a/lib %{!static:-rpath=~a/lib %{!static-libgcc:-rpath=~a/lib64 -rpath=~a/lib %{pthread:-lgcc_s}}} \" ~a"
\"-L~a/lib %{!static:-rpath=~a/lib %{!static-libgcc:-rpath=~a/lib64 -rpath=~a/lib -lgcc_s}} \" ~a"
libc libc libdir libdir suffix))
(("#define GNU_USER_TARGET_STARTFILE_SPEC.*$" line)
(format #f "#define STANDARD_STARTFILE_PREFIX_1 \"~a/lib\"