GNU C Library master sources branch hjl/pr14995 created. glibc-2.25-627-g0bece22

[hjl at sourceware dot org]

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        at  0bece22943b76e739396f41c3929c5ff426839c7 (commit)

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http://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=0bece22943b76e739396f41c3929c5ff426839c7

commit 0bece22943b76e739396f41c3929c5ff426839c7
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Mon Jun 26 12:46:08 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=15373
    
    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/config.make.in b/config.make.in
index dadabf9..c7edfc1 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 8e5c5bd..6df7a73 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
@@ -5703,6 +5704,38 @@ 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 7e03019..245f838 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1291,6 +1291,27 @@ 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 5075c91..948faa9 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 \

http://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=82c62e711080e9cb81d5cde1065b4f88e736830d

commit 82c62e711080e9cb81d5cde1065b4f88e736830d
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Mon Jun 26 11:19:41 2017 -0700

    Run vismain only if linker supports protected data symbol
    
    Gold doesn't support protected data symbol:
    
    configure:5672: checking linker support for protected data symbol
    configure:5682: gcc -fuse-ld=gold -nostdlib -nostartfiles -fno-stack-protector -fPIC -shared conftest.c -o conftest.so
    configure:5685: $? = 0
    configure:5692: gcc -fuse-ld=gold -nostdlib -nostartfiles -fno-stack-protector conftest.c -o conftest conftest.so
    /usr/local/bin/ld.gold: error: /tmp/ccXWoofs.o: cannot make copy relocation for protected symbol 'bar', defined in conftest.so
    collect2: error: ld returned 1 exit status
    
    Run vismain only if linker supports protected data symbol.
    
    	* elf/Makefile (tests): Add vismain only if
    	$(have-protected-data) == yes.
    	(tests-pie): Likewise.

diff --git a/elf/Makefile b/elf/Makefile
index 201b328..62084b4 100644
--- a/elf/Makefile
+++ b/elf/Makefile
@@ -289,10 +289,12 @@ ifeq (yesyes,$(have-fpie)$(build-shared))
 modules-names += tst-piemod1
 tests += tst-pie1 tst-pie2
 tests-pie += tst-pie1 tst-pie2
+ifeq (yes,$(have-protected-data))
 tests += vismain
 tests-pie += vismain
 CFLAGS-vismain.c = $(PIE-ccflag)
 endif
+endif
 modules-execstack-yes = tst-execstack-mod
 extra-test-objs += $(addsuffix .os,$(strip $(modules-names)))
 

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