Bug 28469: Fix unsupported libbacktrace in Rust 1.26

projects/rust/0001-Make-sure-dl_iterate_phdr-is-undefined-on-Android.patch

+From 4fa67c8a014ac10558be71edec9048851ca7a02d Mon Sep 17 00:00:00 2001
+From: Georg Koppen <gk@torproject.org>
+Date: Thu, 15 Nov 2018 19:04:46 +0000
+Subject: [PATCH] Make sure `dl_iterate_phdr` is undefined on Android
+
+If we build with API < 21 we'll run into undefined reference errors.
+We follow the Rust people who ran into similar issues when
+upgrading libbacktrace for 1.28.0 in making sure `dl_iterate_phdr` is
+not defined for Android.
+
+diff --git a/src/libbacktrace/configure b/src/libbacktrace/configure
+index 8bdb29d256..8941fcd2b0 100755
+--- a/src/libbacktrace/configure
++++ b/src/libbacktrace/configure
+@@ -12397,7 +12397,15 @@ rm -f conftest*
+ 	have_dl_iterate_phdr=no ;;
+     esac
+   else
+-    ac_fn_c_check_func "$LINENO" "dl_iterate_phdr" "ac_cv_func_dl_iterate_phdr"
++    case "${host}" in
++    *-*-androideabi*)
++        # Avoid dl_iterate_phdr on older Android API (which we use),
++        # as defining it causes undefined reference errors when
++        # compiling Firefox later on.
++        have_dl_iterate_phdr=no ;;
++    *) ac_fn_c_check_func "$LINENO" "dl_iterate_phdr" "ac_cv_func_dl_iterate_phdr" ;;
++    esac
++
+ if test "x$ac_cv_func_dl_iterate_phdr" = x""yes; then :
+   have_dl_iterate_phdr=yes
+ else
+-- 
+2.19.1
+

projects/rust/build

@@ -62,6 +62,11 @@ cd /var/tmp/build/rustc-[% c('version') %]-src
   patch -p1 < $rootdir/unwind.patch
 [% END %]
 
+[% IF c("var/android") %]
+  patch -p1 < $rootdir/0001-Make-sure-dl_iterate_phdr-is-undefined-on-Android.patch
+  patch -p1 < $rootdir/replace_pagesize_in_mmap.patch
+[% END %]
+
 mkdir build
 cd build
 ../configure --prefix=$distdir [% c("var/configure_opt") %]

projects/rust/config

@@ -22,7 +22,7 @@ targets:
         - libssl-dev
         - pkg-config
         - zlib1g-dev
-      configure_opt: --enable-local-rust --enable-vendor --enable-extended --release-channel=stable --sysconfdir=etc --target=armv7-linux-androideabi --set=target.armv7-linux-androideabi.ar=$ANDROID_NDK_HOME/arm/bin/arm-linux-androideabi-ar --set=target.armv7-linux-androideabi.linker=$ANDROID_NDK_HOME/arm/bin/arm-linux-androideabi-clang --set=target.armv7-linux-androideabi.cc=$ANDROID_NDK_HOME/arm/bin/arm-linux-androideabi-gcc
+      configure_opt: --enable-local-rust --enable-vendor --enable-extended --release-channel=stable --sysconfdir=etc --target=armv7-linux-androideabi --set=target.armv7-linux-androideabi.cc=$ANDROID_NDK_HOME/arm/bin/arm-linux-androideabi-gcc
 
   linux:
     var:
@@ -90,3 +90,7 @@ input_files:
     gpg_keyring: rust.gpg
   - filename: unwind.patch
     enable: '[% c("var/windows-i686") %]'
+  - filename: 0001-Make-sure-dl_iterate_phdr-is-undefined-on-Android.patch
+    enable: '[% c("var/android") %]'
+  - filename: replace_pagesize_in_mmap.patch
+    enable: '[% c("var/android") %]'

projects/rust/replace_pagesize_in_mmap.patch

+diff --git a/src/libbacktrace/mmap.c b/src/libbacktrace/mmap.c
+index 138ef70711..e3c4cd2643 100644
+--- a/src/libbacktrace/mmap.c
++++ b/src/libbacktrace/mmap.c
+@@ -140,7 +140,7 @@ backtrace_alloc (struct backtrace_state *state,
+     {
+       /* Allocate a new page.  */
+ 
+-      pagesize = getpagesize ();
++      pagesize = sysconf(_SC_PAGESIZE);
+       asksize = (size + pagesize - 1) & ~ (pagesize - 1);
+       page = mmap (NULL, asksize, PROT_READ | PROT_WRITE,
+ 		   MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+@@ -181,7 +181,7 @@ backtrace_free (struct backtrace_state *state, void *addr, size_t size,
+     {
+       size_t pagesize;
+ 
+-      pagesize = getpagesize ();
++      pagesize = sysconf(_SC_PAGESIZE);
+       if (((uintptr_t) addr & (pagesize - 1)) == 0
+ 	  && (size & (pagesize - 1)) == 0)
+ 	{
+@@ -226,7 +226,7 @@ backtrace_vector_grow (struct backtrace_state *state,size_t size,
+       size_t alc;
+       void *base;
+ 
+-      pagesize = getpagesize ();
++      pagesize = sysconf(_SC_PAGESIZE);
+       alc = vec->size + size;
+       if (vec->size == 0)
+ 	alc = 16 * size;
+diff --git a/src/libbacktrace/mmapio.c b/src/libbacktrace/mmapio.c
+index dfdaf6fa52..5b23003090 100644
+--- a/src/libbacktrace/mmapio.c
++++ b/src/libbacktrace/mmapio.c
+@@ -60,7 +60,7 @@ backtrace_get_view (struct backtrace_state *state ATTRIBUTE_UNUSED,
+   off_t pageoff;
+   void *map;
+ 
+-  pagesize = getpagesize ();
++  pagesize = sysconf(_SC_PAGESIZE);
+   inpage = offset % pagesize;
+   pageoff = offset - inpage;
+