Add libasan build option and test print-needed

(cherry picked from commit 288eb61)

Author: Aaron D. Marasco

configure.ac

@@ -24,5 +24,10 @@ fi
 AC_DEFINE_UNQUOTED(PAGESIZE, ${PAGESIZE})
 AC_MSG_RESULT([Setting page size to ${PAGESIZE}])
 
+AC_ARG_WITH([asan],
+   AS_HELP_STRING([--with-asan], [Link with libasan])
+)
+AM_CONDITIONAL([WITH_ASAN], [test x"$with_asan" = xyes])
+
 AC_CONFIG_FILES([Makefile src/Makefile tests/Makefile patchelf.spec])
 AC_OUTPUT

src/Makefile.am

@@ -1,5 +1,9 @@
 AM_CXXFLAGS = -Wall -std=c++11 -D_FILE_OFFSET_BITS=64
 
+if WITH_ASAN
+AM_CXXFLAGS += -fsanitize=address -fno-optimize-sibling-calls -fsanitize-address-use-after-scope -fno-omit-frame-pointer -g -O1
+endif
+
 bin_PROGRAMS = patchelf
 
 patchelf_SOURCES = patchelf.cc elf.h

src/patchelf.cc

@@ -250,7 +250,6 @@ I ElfFile<ElfFileParamNames>::rdi(I i)
     return r;
 }
 
-
 /* Ugly: used to erase DT_RUNPATH when using --force-rpath. */
 #define DT_IGNORE       0x00726e67
 
@@ -737,7 +736,7 @@ void ElfFile<ElfFileParamNames>::rewriteSectionsLibrary()
        ET_DYN as does LD when linking with pie. If we move PT_PHDR, it
        has to stay in the first PT_LOAD segment or any subsequent ones
        if they're continuous in memory due to linux kernel constraints
-       (see BUGS). Since the end of the file would be after bss, we can't 
+       (see BUGS). Since the end of the file would be after bss, we can't
        move PHDR there, we therefore choose to leave PT_PHDR where it is but
        move enough following sections such that we can add the extra PT_LOAD
        section to it. This PT_LOAD segment ensures the sections at the end of

tests/Makefile.am

@@ -23,6 +23,7 @@ src_TESTS = \
   set-interpreter-long.sh set-rpath.sh no-rpath.sh big-dynstr.sh \
   set-rpath-library.sh soname.sh shrink-rpath-with-allowed-prefixes.sh \
   force-rpath.sh \
+  plain-needed.sh \
   output-flag.sh
 
 build_TESTS = \

tests/plain-needed.sh

@@ -0,0 +1,4 @@
+#! /bin/sh
+set -e
+echo "Confirming main requires libfoo"
+../src/patchelf --print-needed main | grep -q libfoo.so