It appears that the segfaults in libcap-ng0 described in my earlier bug report, caused by (or at least related to) use of R_ARM_GOTOFF32 relocations with TLS symbols, can be avoided by compiling libcap-ng without optimization. I attach an interdiff; for your convenience, it also includes fixes for the two minor bugs I just reported.
I suspect that the R_ARM_GOTOFF32 thing may be a bug in gcc or some other
toolchain component (perhaps gcc is applying an inappropriate optimization?),
but I've run out of toolchain knowledge. Is there a toolchain or ARM guru who
can pick this up?
Thanks,
Simon
diff -u libcap-ng-0.6.2/debian/changelog libcap-ng-0.6.2/debian/changelog
--- libcap-ng-0.6.2/debian/changelog
+++ libcap-ng-0.6.2/debian/changelog
@@ -1,3 +1,15 @@
+libcap-ng (0.6.2-1.1) UNRELEASED; urgency=low
+
+ * Non-maintainer upload.
+ * Don't optimize on armel, to work around overly aggressive optimization (?)
+ on __thread variable. Closes: #546823
+ * Fix NAME sections of man pages so whatis can understand them (Lintian
+ warning).
+ * Install .pc file so pkg-config can be used to find libcap-ng (dh_install
+ warning).
+
+ -- Simon McVittie <s...@debian.org> Thu, 22 Oct 2009 22:22:28 +0000
+
libcap-ng (0.6.2-1) unstable; urgency=low
* New upstream release
diff -u libcap-ng-0.6.2/debian/rules libcap-ng-0.6.2/debian/rules
--- libcap-ng-0.6.2/debian/rules
+++ libcap-ng-0.6.2/debian/rules
@@ -23,7 +23,10 @@
PYDEF=$(shell pyversions -d)
PYVERS=$(shell pyversions -r)
-
+# armel compiler doesn't seem to do too well at __thread if optimizing
+ifeq ($(DEB_BUILD_GNU_TYPE),arm-linux-gnueabi)
+CFLAGS += -O0
+endif
# shared library versions, option 1
version=2.0.5
diff -u libcap-ng-0.6.2/debian/libcap-ng-dev.install
libcap-ng-0.6.2/debian/libcap-ng-dev.install
--- libcap-ng-0.6.2/debian/libcap-ng-dev.install
+++ libcap-ng-0.6.2/debian/libcap-ng-dev.install
@@ -3,4 +3,5 @@
usr/lib/lib*.so
usr/lib/*.la
+usr/lib/pkgconfig/*.pc
usr/share/aclocal/*
usr/share/man/man3/*
only in patch2:
unchanged:
--- libcap-ng-0.6.2.orig/docs/capng_set_caps_fd.3
+++ libcap-ng-0.6.2/docs/capng_set_caps_fd.3
@@ -1,6 +1,6 @@
.TH "CAPNG_SET_CAPS_FD" "3" "June 2009" "Red Hat" "Libcap-ng API"
.SH NAME
-capng_set_caps_fd \-
+capng_set_caps_fd \- write file-based capabilities to extended attributes
.SH "SYNOPSIS"
.B #include <cap-ng.h>
.sp
only in patch2:
unchanged:
--- libcap-ng-0.6.2.orig/docs/capng_get_caps_fd.3
+++ libcap-ng-0.6.2/docs/capng_get_caps_fd.3
@@ -1,6 +1,6 @@
.TH "CAPNG_GET_CAPS_FD" "3" "June 2009" "Red Hat" "Libcap-ng API"
.SH NAME
-capng_get_caps_fd \-
+capng_get_caps_fd \- read file-based capabilities from extended attributes
.SH "SYNOPSIS"
.B #include <cap-ng.h>
.sp
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