[Buildroot] [PATCH 1/2] xserver_xorg-server: fix libunwind on MIPS with 32-bit pointers
Vicente Olivert Riera
Vincent.Riera at imgtec.com
Sun Feb 15 18:10:58 UTC 2015
Adding a patch to fix a compilation problem of Xorg + libunwind support
when building it on MIPS variants with 32-bit pointers.
Related:
http://lists.busybox.net/pipermail/buildroot/2014-December/114404.html
Patch submitted upstream:
http://lists.x.org/archives/xorg-devel/2015-January/045226.html
Patch reviewed by an Xorg developer:
http://lists.x.org/archives/xorg-devel/2015-January/045383.html
Fixes:
http://autobuild.buildroot.net/results/87b/87be2c95957f9925c1258812e536df72689fc5da/
Signed-off-by: Vicente Olivert Riera <Vincent.Riera at imgtec.com>
---
...04-backtrace.c-Fix-word-cast-to-a-pointer.patch | 90 ++++++++++++++++++++
1 files changed, 90 insertions(+), 0 deletions(-)
create mode 100644 package/x11r7/xserver_xorg-server/0004-backtrace.c-Fix-word-cast-to-a-pointer.patch
diff --git a/package/x11r7/xserver_xorg-server/0004-backtrace.c-Fix-word-cast-to-a-pointer.patch b/package/x11r7/xserver_xorg-server/0004-backtrace.c-Fix-word-cast-to-a-pointer.patch
new file mode 100644
index 0000000..08944d6
--- /dev/null
+++ b/package/x11r7/xserver_xorg-server/0004-backtrace.c-Fix-word-cast-to-a-pointer.patch
@@ -0,0 +1,90 @@
+backtrace.c: Fix word cast to a pointer
+
+This patch fixes a compilation problem of Xorg + libunwind support when
+building it on MIPS variants with 32-bit pointers.
+
+Related:
+
+ http://lists.busybox.net/pipermail/buildroot/2014-December/114404.html
+
+Patch submitted upstream:
+
+ http://lists.x.org/archives/xorg-devel/2015-January/045226.html
+
+Patch reviewed by an Xorg developer:
+
+ http://lists.x.org/archives/xorg-devel/2015-January/045383.html
+
+Signed-off-by: Vicente Olivert Riera <Vincent.Riera at imgtec.com>
+
+From 84f04e0274661401a91efd4e9b21dccc1396e1d6 Mon Sep 17 00:00:00 2001
+From: Vicente Olivert Riera <Vincent.Riera at imgtec.com>
+Date: Wed, 3 Dec 2014 11:34:47 +0000
+Subject: [PATCH] backtrace.c: Fix word cast to a pointer
+
+backtrace.c uses a word size provided by libunwind. In some
+architectures like MIPS, libunwind makes that word size 64-bit for all
+variants of the architecture.
+
+In the lines #90 and #98, backtrace.c tries to do a cast to a pointer,
+which fails in all MIPS variants with 32-bit pointers, like MIPS32 or
+MIPS64 n32, because it's trying to do a cast from a 64-bit wide variable
+to a 32-bit pointer:
+
+Making all in os
+make[2]: Entering directory
+`/home/test/test/1/output/build/xserver_xorg-server-1.15.1/os'
+ CC WaitFor.lo
+ CC access.lo
+ CC auth.lo
+ CC backtrace.lo
+backtrace.c: In function 'xorg_backtrace':
+backtrace.c:90:20: error: cast to pointer from integer of different size
+[-Werror=int-to-pointer-cast]
+ if (dladdr((void *)(pip.start_ip + off), &dlinfo) &&
+dlinfo.dli_fname &&
+ ^
+backtrace.c:98:13: error: cast to pointer from integer of different size
+[-Werror=int-to-pointer-cast]
+ (void *)(pip.start_ip + off));
+ ^
+cc1: some warnings being treated as errors
+make[2]: *** [backtrace.lo] Error 1
+make[2]: *** Waiting for unfinished jobs....
+
+Making the cast to a pointer-sized integer, and then to a pointer fixes
+the problem.
+
+Related:
+ https://bugs.freedesktop.org/show_bug.cgi?id=79939
+
+Signed-off-by: Vicente Olivert Riera <Vincent.Riera at imgtec.com>
+---
+ os/backtrace.c | 4 ++--
+ 1 files changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/os/backtrace.c b/os/backtrace.c
+index 3d1195b..fd129ef 100644
+--- a/os/backtrace.c
++++ b/os/backtrace.c
+@@ -87,7 +87,7 @@ xorg_backtrace(void)
+ procname[1] = 0;
+ }
+
+- if (dladdr((void *)(pip.start_ip + off), &dlinfo) && dlinfo.dli_fname &&
++ if (dladdr((void *)(uintptr_t)(pip.start_ip + off), &dlinfo) && dlinfo.dli_fname &&
+ *dlinfo.dli_fname)
+ filename = dlinfo.dli_fname;
+ else
+@@ -95,7 +95,7 @@ xorg_backtrace(void)
+
+ ErrorFSigSafe("%u: %s (%s%s+0x%x) [%p]\n", i++, filename, procname,
+ ret == -UNW_ENOMEM ? "..." : "", (int)off,
+- (void *)(pip.start_ip + off));
++ (void *)(uintptr_t)(pip.start_ip + off));
+
+ ret = unw_step(&cursor);
+ if (ret < 0)
+--
+1.7.1
+
--
1.7.1
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