GNU C Library master sources branch master updated. glibc-2.26-27-g19f1a11

[hjl at sourceware dot org]

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http://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=19f1a11e7ea2a5082bae9d9a079338c5658ba954

commit 19f1a11e7ea2a5082bae9d9a079338c5658ba954
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Fri Aug 4 12:17:15 2017 -0700

    Check linker support for INSERT in linker script
    
    Since gold doesn't support INSERT in linker script:
    
    https://sourceware.org/bugzilla/show_bug.cgi?id=21676
    
    tst-split-dynreloc fails to link with gold.  Check if linker supports
    INSERT in linker script before using it.
    
    	* config.make.in (have-insert): New.
    	* configure.ac (libc_cv_insert): New.  Set to yes if linker
    	supports INSERT in linker script.
    	(AC_SUBST(libc_cv_insert): New.
    	* configure: Regenerated.
    	* sysdeps/x86_64/Makefile (tests): Add tst-split-dynreloc only
    	if $(have-insert) == yes.

diff --git a/ChangeLog b/ChangeLog
index 33caac7..cc540a1 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,15 @@
 2017-08-04  H.J. Lu  <hongjiu.lu@intel.com>
 
+	* config.make.in (have-insert): New.
+	* configure.ac (libc_cv_insert): New.  Set to yes if linker
+	supports INSERT in linker script.
+	(AC_SUBST(libc_cv_insert): New.
+	* configure: Regenerated.
+	* sysdeps/x86_64/Makefile (tests): Add tst-split-dynreloc only
+	if $(have-insert) == yes.
+
+2017-08-04  H.J. Lu  <hongjiu.lu@intel.com>
+
 	* elf/Makefile (tests): Add vismain only if
 	$(have-protected-data) == yes.
 	(tests-pie): Likewise.
diff --git a/config.make.in b/config.make.in
index 5a4a054..7eff1da 100644
--- a/config.make.in
+++ b/config.make.in
@@ -54,6 +54,7 @@ enable-werror = @enable_werror@
 have-z-combreloc = @libc_cv_z_combreloc@
 have-z-execstack = @libc_cv_z_execstack@
 have-protected-data = @libc_cv_protected_data@
+have-insert = @libc_cv_insert@
 have-glob-dat-reloc = @libc_cv_has_glob_dat@
 with-fp = @with_fp@
 enable-timezone-tools = @enable_timezone_tools@
diff --git a/configure b/configure
index d8e1c50..e6a54d7 100755
--- a/configure
+++ b/configure
@@ -629,6 +629,7 @@ libc_cv_z_execstack
 libc_cv_z_combreloc
 ASFLAGS_config
 libc_cv_cc_with_libunwind
+libc_cv_insert
 libc_cv_protected_data
 BISON
 INSTALL_INFO
@@ -5716,6 +5717,38 @@ fi
 $as_echo "$libc_cv_protected_data" >&6; }
 
 
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking linker support for INSERT in linker script" >&5
+$as_echo_n "checking linker support for INSERT in linker script... " >&6; }
+if ${libc_cv_insert+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  cat > conftest.c <<EOF
+		const int __attribute__ ((section(".bar"))) bar = 0x12345678;
+		int test (void) { return bar; }
+EOF
+		cat > conftest.t <<EOF
+		SECTIONS
+		{
+		  .bar : { *(.bar) }
+		}
+		INSERT AFTER .rela.dyn;
+EOF
+		libc_cv_insert=no
+		if { ac_try='${CC-cc} -nostdlib -nostartfiles $no_ssp -fPIC -shared conftest.c -Wl,-T,conftest.t -o conftest.so'
+  { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+  test $ac_status = 0; }; }; then
+		  libc_cv_insert=yes
+		fi
+		rm -f conftest.*
+
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_insert" >&5
+$as_echo "$libc_cv_insert" >&6; }
+
+
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for broken __attribute__((alias()))" >&5
 $as_echo_n "checking for broken __attribute__((alias()))... " >&6; }
 if ${libc_cv_broken_alias_attribute+:} false; then :
diff --git a/configure.ac b/configure.ac
index 77456aa..2c63088 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1298,6 +1298,27 @@ EOF
 	       ])
 AC_SUBST(libc_cv_protected_data)
 
+AC_CACHE_CHECK(linker support for INSERT in linker script,
+	       libc_cv_insert,
+	       [cat > conftest.c <<EOF
+		const int __attribute__ ((section(".bar"))) bar = 0x12345678;
+		int test (void) { return bar; }
+EOF
+		cat > conftest.t <<EOF
+		SECTIONS
+		{
+		  .bar : { *(.bar) }
+		}
+		INSERT AFTER .rela.dyn;
+EOF
+		libc_cv_insert=no
+		if AC_TRY_COMMAND([${CC-cc} -nostdlib -nostartfiles $no_ssp -fPIC -shared conftest.c -Wl,-T,conftest.t -o conftest.so]); then
+		  libc_cv_insert=yes
+		fi
+		rm -f conftest.*
+	       ])
+AC_SUBST(libc_cv_insert)
+
 AC_CACHE_CHECK(for broken __attribute__((alias())),
 	       libc_cv_broken_alias_attribute,
 	       [cat > conftest.c <<EOF
diff --git a/sysdeps/x86_64/Makefile b/sysdeps/x86_64/Makefile
index 132470d..7f3ffe3 100644
--- a/sysdeps/x86_64/Makefile
+++ b/sysdeps/x86_64/Makefile
@@ -59,9 +59,11 @@ test-extras += tst-audit4-aux tst-audit10-aux \
 extra-test-objs += tst-audit4-aux.o tst-audit10-aux.o \
 		   tst-avx-aux.o tst-avx512-aux.o
 
+ifeq ($(have-insert),yes)
 tests += tst-split-dynreloc
 LDFLAGS-tst-split-dynreloc = -Wl,-T,$(..)sysdeps/x86_64/tst-split-dynreloc.lds
 tst-split-dynreloc-ENV = LD_BIND_NOW=1
+endif
 
 modules-names += tst-auditmod3a tst-auditmod3b \
 		tst-auditmod4a tst-auditmod4b \

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog               |   10 ++++++++++
 config.make.in          |    1 +
 configure               |   33 +++++++++++++++++++++++++++++++++
 configure.ac            |   21 +++++++++++++++++++++
 sysdeps/x86_64/Makefile |    2 ++
 5 files changed, 67 insertions(+), 0 deletions(-)


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