[binutils-gdb] binutils: Add AC_FUNC_MMAP to configure.ac

[H.J.Lu <hjl at sourceware dot org>]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=34156b23862e9719355569182d594c7a9e38047e

commit 34156b23862e9719355569182d594c7a9e38047e
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Fri Nov 2 16:45:41 2018 -0700

    binutils: Add AC_FUNC_MMAP to configure.ac
    
    Add AC_FUNC_MMAP to configure.ac so that HAVE_MMAP will be checked in
    objdump.c and mmap is used if available.
    
    	* configure.ac (AC_FUNC_MMAP): New.
    	* config.in: Regenerated.
    	* configure: Likewise.

Diff:
---
 binutils/ChangeLog    |   6 ++
 binutils/config.in    |   6 ++
 binutils/configure    | 209 +++++++++++++++++++++++++++++++++++++++++++++++++-
 binutils/configure.ac |   1 +
 4 files changed, 220 insertions(+), 2 deletions(-)

diff --git a/binutils/ChangeLog b/binutils/ChangeLog
index 662ee24..1947569 100644
--- a/binutils/ChangeLog
+++ b/binutils/ChangeLog
@@ -1,3 +1,9 @@
+2018-11-02  H.J. Lu  <hongjiu.lu@intel.com>
+
+	* configure.ac (AC_FUNC_MMAP): New.
+	* config.in: Regenerated.
+	* configure: Likewise.
+
 2018-11-02  Alan Modra  <amodra@gmail.com>
 
 	* readelf.c (process_section_headers): Don't warn on a zero
diff --git a/binutils/config.in b/binutils/config.in
index 64de38b..72ead4e 100644
--- a/binutils/config.in
+++ b/binutils/config.in
@@ -94,6 +94,9 @@
 /* Define to 1 if you have the `getc_unlocked' function. */
 #undef HAVE_GETC_UNLOCKED
 
+/* Define to 1 if you have the `getpagesize' function. */
+#undef HAVE_GETPAGESIZE
+
 /* Does <utime.h> define struct utimbuf? */
 #undef HAVE_GOOD_UTIME_H
 
@@ -127,6 +130,9 @@
 /* Define to 1 if you have the `mkstemp' function. */
 #undef HAVE_MKSTEMP
 
+/* Define to 1 if you have a working `mmap' system call. */
+#undef HAVE_MMAP
+
 /* Define to 1 if you have the `sbrk' function. */
 #undef HAVE_SBRK
 
diff --git a/binutils/configure b/binutils/configure
index df952c6..e356ffd 100755
--- a/binutils/configure
+++ b/binutils/configure
@@ -629,6 +629,7 @@ ac_includes_default="\
 # include <unistd.h>
 #endif"
 
+ac_header_list=
 ac_subst_vars='am__EXEEXT_FALSE
 am__EXEEXT_TRUE
 LTLIBOBJS
@@ -2497,6 +2498,9 @@ $as_echo "$as_me: creating cache $cache_file" >&6;}
   >$cache_file
 fi
 
+as_fn_append ac_header_list " stdlib.h"
+as_fn_append ac_header_list " unistd.h"
+as_fn_append ac_header_list " sys/param.h"
 # Check that the precious variables saved in the cache have kept the same
 # value.
 ac_cache_corrupted=false
@@ -11519,7 +11523,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 11522 "configure"
+#line 11526 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -11625,7 +11629,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 11628 "configure"
+#line 11632 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -13539,6 +13543,207 @@ _ACEOF
 
 fi
 
+
+
+
+  for ac_header in $ac_header_list
+do :
+  as_ac_Header=`$as_echo "ac_cv_header_$ac_header" | $as_tr_sh`
+ac_fn_c_check_header_compile "$LINENO" "$ac_header" "$as_ac_Header" "$ac_includes_default
+"
+if eval test \"x\$"$as_ac_Header"\" = x"yes"; then :
+  cat >>confdefs.h <<_ACEOF
+#define `$as_echo "HAVE_$ac_header" | $as_tr_cpp` 1
+_ACEOF
+
+fi
+
+done
+
+
+
+
+
+
+
+
+for ac_func in getpagesize
+do :
+  ac_fn_c_check_func "$LINENO" "getpagesize" "ac_cv_func_getpagesize"
+if test "x$ac_cv_func_getpagesize" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_GETPAGESIZE 1
+_ACEOF
+
+fi
+done
+
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for working mmap" >&5
+$as_echo_n "checking for working mmap... " >&6; }
+if ${ac_cv_func_mmap_fixed_mapped+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  if test "$cross_compiling" = yes; then :
+  ac_cv_func_mmap_fixed_mapped=no
+else
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+$ac_includes_default
+/* malloc might have been renamed as rpl_malloc. */
+#undef malloc
+
+/* Thanks to Mike Haertel and Jim Avera for this test.
+   Here is a matrix of mmap possibilities:
+	mmap private not fixed
+	mmap private fixed at somewhere currently unmapped
+	mmap private fixed at somewhere already mapped
+	mmap shared not fixed
+	mmap shared fixed at somewhere currently unmapped
+	mmap shared fixed at somewhere already mapped
+   For private mappings, we should verify that changes cannot be read()
+   back from the file, nor mmap's back from the file at a different
+   address.  (There have been systems where private was not correctly
+   implemented like the infamous i386 svr4.0, and systems where the
+   VM page cache was not coherent with the file system buffer cache
+   like early versions of FreeBSD and possibly contemporary NetBSD.)
+   For shared mappings, we should conversely verify that changes get
+   propagated back to all the places they're supposed to be.
+
+   Grep wants private fixed already mapped.
+   The main things grep needs to know about mmap are:
+   * does it exist and is it safe to write into the mmap'd area
+   * how to use it (BSD variants)  */
+
+#include <fcntl.h>
+#include <sys/mman.h>
+
+#if !defined STDC_HEADERS && !defined HAVE_STDLIB_H
+char *malloc ();
+#endif
+
+/* This mess was copied from the GNU getpagesize.h.  */
+#ifndef HAVE_GETPAGESIZE
+# ifdef _SC_PAGESIZE
+#  define getpagesize() sysconf(_SC_PAGESIZE)
+# else /* no _SC_PAGESIZE */
+#  ifdef HAVE_SYS_PARAM_H
+#   include <sys/param.h>
+#   ifdef EXEC_PAGESIZE
+#    define getpagesize() EXEC_PAGESIZE
+#   else /* no EXEC_PAGESIZE */
+#    ifdef NBPG
+#     define getpagesize() NBPG * CLSIZE
+#     ifndef CLSIZE
+#      define CLSIZE 1
+#     endif /* no CLSIZE */
+#    else /* no NBPG */
+#     ifdef NBPC
+#      define getpagesize() NBPC
+#     else /* no NBPC */
+#      ifdef PAGESIZE
+#       define getpagesize() PAGESIZE
+#      endif /* PAGESIZE */
+#     endif /* no NBPC */
+#    endif /* no NBPG */
+#   endif /* no EXEC_PAGESIZE */
+#  else /* no HAVE_SYS_PARAM_H */
+#   define getpagesize() 8192	/* punt totally */
+#  endif /* no HAVE_SYS_PARAM_H */
+# endif /* no _SC_PAGESIZE */
+
+#endif /* no HAVE_GETPAGESIZE */
+
+int
+main ()
+{
+  char *data, *data2, *data3;
+  const char *cdata2;
+  int i, pagesize;
+  int fd, fd2;
+
+  pagesize = getpagesize ();
+
+  /* First, make a file with some known garbage in it. */
+  data = (char *) malloc (pagesize);
+  if (!data)
+    return 1;
+  for (i = 0; i < pagesize; ++i)
+    *(data + i) = rand ();
+  umask (0);
+  fd = creat ("conftest.mmap", 0600);
+  if (fd < 0)
+    return 2;
+  if (write (fd, data, pagesize) != pagesize)
+    return 3;
+  close (fd);
+
+  /* Next, check that the tail of a page is zero-filled.  File must have
+     non-zero length, otherwise we risk SIGBUS for entire page.  */
+  fd2 = open ("conftest.txt", O_RDWR | O_CREAT | O_TRUNC, 0600);
+  if (fd2 < 0)
+    return 4;
+  cdata2 = "";
+  if (write (fd2, cdata2, 1) != 1)
+    return 5;
+  data2 = (char *) mmap (0, pagesize, PROT_READ | PROT_WRITE, MAP_SHARED, fd2, 0L);
+  if (data2 == MAP_FAILED)
+    return 6;
+  for (i = 0; i < pagesize; ++i)
+    if (*(data2 + i))
+      return 7;
+  close (fd2);
+  if (munmap (data2, pagesize))
+    return 8;
+
+  /* Next, try to mmap the file at a fixed address which already has
+     something else allocated at it.  If we can, also make sure that
+     we see the same garbage.  */
+  fd = open ("conftest.mmap", O_RDWR);
+  if (fd < 0)
+    return 9;
+  if (data2 != mmap (data2, pagesize, PROT_READ | PROT_WRITE,
+		     MAP_PRIVATE | MAP_FIXED, fd, 0L))
+    return 10;
+  for (i = 0; i < pagesize; ++i)
+    if (*(data + i) != *(data2 + i))
+      return 11;
+
+  /* Finally, make sure that changes to the mapped area do not
+     percolate back to the file as seen by read().  (This is a bug on
+     some variants of i386 svr4.0.)  */
+  for (i = 0; i < pagesize; ++i)
+    *(data2 + i) = *(data2 + i) + 1;
+  data3 = (char *) malloc (pagesize);
+  if (!data3)
+    return 12;
+  if (read (fd, data3, pagesize) != pagesize)
+    return 13;
+  for (i = 0; i < pagesize; ++i)
+    if (*(data + i) != *(data3 + i))
+      return 14;
+  close (fd);
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_run "$LINENO"; then :
+  ac_cv_func_mmap_fixed_mapped=yes
+else
+  ac_cv_func_mmap_fixed_mapped=no
+fi
+rm -f core *.core core.conftest.* gmon.out bb.out conftest$ac_exeext \
+  conftest.$ac_objext conftest.beam conftest.$ac_ext
+fi
+
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_func_mmap_fixed_mapped" >&5
+$as_echo "$ac_cv_func_mmap_fixed_mapped" >&6; }
+if test $ac_cv_func_mmap_fixed_mapped = yes; then
+
+$as_echo "#define HAVE_MMAP 1" >>confdefs.h
+
+fi
+rm -f conftest.mmap conftest.txt
+
 for ac_func in sbrk utimes setmode getc_unlocked strcoll setlocale
 do :
   as_ac_var=`$as_echo "ac_cv_func_$ac_func" | $as_tr_sh`
diff --git a/binutils/configure.ac b/binutils/configure.ac
index 68318eb..59e364c 100644
--- a/binutils/configure.ac
+++ b/binutils/configure.ac
@@ -130,6 +130,7 @@ AC_CHECK_HEADERS(string.h strings.h stdlib.h unistd.h fcntl.h sys/file.h limits.
 AC_HEADER_SYS_WAIT
 ACX_HEADER_STRING
 AC_FUNC_ALLOCA
+AC_FUNC_MMAP
 AC_CHECK_FUNCS(sbrk utimes setmode getc_unlocked strcoll setlocale)
 AC_CHECK_FUNC([mkstemp],
 	      AC_DEFINE([HAVE_MKSTEMP], 1,