From 1f02a4ba8d725336e678baf503d12a9d063bea39 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Jan=20Dj=C3=A4rv?= Date: Sat, 25 Sep 2004 20:39:13 +0000 Subject: [PATCH] * PROBLEMS: Updated exec-shield description. --- etc/ChangeLog | 4 ++++ etc/PROBLEMS | 22 ++++++++++++++-------- 2 files changed, 18 insertions(+), 8 deletions(-) diff --git a/etc/ChangeLog b/etc/ChangeLog index 16e02786542..563450433cc 100644 --- a/etc/ChangeLog +++ b/etc/ChangeLog @@ -1,3 +1,7 @@ +2004-09-25 Jan D. + + * PROBLEMS: Updated exec-shield description. + 2004-09-16 Dan Nicolaescu * e/eterm.ti: Change the strings for smso and rmso. diff --git a/etc/PROBLEMS b/etc/PROBLEMS index 4a99e351e23..516947245a7 100644 --- a/etc/PROBLEMS +++ b/etc/PROBLEMS @@ -2329,28 +2329,34 @@ The fix is to install a newer version of ncurses, such as version 4.2. *** Linux: Segfault during `make bootstrap' under certain recent versions of the Linux kernel. With certain recent Linux kernels (like the one of Redhat Fedora Core -1), the new "Exec-shield" functionality is enabled by default, which +1 and 2), the new "Exec-shield" functionality is enabled by default, which creates a different memory layout that breaks the emacs dumper. +Configure can overcome the problem of exec-shield if the architecture is +x86 and the program setarch is present. On other architectures no +workaround is known. + You can check the Exec-shield state like this: cat /proc/sys/kernel/exec-shield -It returns 1 or 2 when Exec-shield is enabled, 0 otherwise. Please +It returns non-zero when Exec-shield is enabled, 0 otherwise. Please read your system documentation for more details on Exec-shield and -associated commands. +associated commands. Exec-shield can be turned off with this command: + + echo "0" > /proc/sys/kernel/exec-shield When Exec-shield is enabled, building Emacs will segfault during the execution of this command: -temacs --batch --load loadup [dump|bootstrap] + ./temacs --batch --load loadup [dump|bootstrap] To work around this problem, it is necessary to temporarily disable -Exec-shield while building Emacs, using the `setarch' command like -this: +Exec-shield while building Emacs, or, on x86, by using the `setarch' +command when running temacs like this: + + setarch i386 ./temacs --batch --load loadup [dump|bootstrap] - setarch i386 ./configure - setarch i386 make *** Fatal signal in the command temacs -l loadup inc dump. -- 2.39.2