[PATCH] ld: Add --enable-textrel-check=[no|yes|warning|error]
H.J. Lu
hjl.tools@gmail.com
Mon May 25 13:57:26 GMT 2020
Add a configure option, --enable-textrel-check=[no|yes|warning|error],
to decide what ELF linker should do by default with DT_TEXTREL in an
executable or shared library.
This patch depends on
https://sourceware.org/pipermail/binutils/2020-May/111250.html
OK for master?
H.J.
---
PR ld/20824
* NEWS: Mention --enable-textrel-check=[no|yes|warning|error].
* configure.ac: Add --enable-textrel-check=[no|yes|warning|error].
(DEFAULT_LD_TEXTREL_CHECK): New AC_DEFINE_UNQUOTED.
(DEFAULT_LD_TEXTREL_CHECK_WARNING): Likewise.
* ldmain.c (main): Initialize link_info.textrel_check to
DEFAULT_LD_TEXTREL_CHECK.
* lexsup.c (ld_options): Check DEFAULT_LD_TEXTREL_CHECK_WARNING.
* config.in: Regenerated.
* configure: Likewise.
---
ld/NEWS | 4 ++++
ld/config.in | 6 ++++++
ld/configure | 41 +++++++++++++++++++++++++++++++++++++++--
ld/configure.ac | 28 ++++++++++++++++++++++++++++
ld/ldmain.c | 1 +
ld/lexsup.c | 7 ++++++-
6 files changed, 84 insertions(+), 3 deletions(-)
diff --git a/ld/NEWS b/ld/NEWS
index 0aaa13d487..5dd912447e 100644
--- a/ld/NEWS
+++ b/ld/NEWS
@@ -1,5 +1,9 @@
-*- text -*-
+* Add a configure option, --enable-textrel-check=[no|yes|warning|error],
+ to decide what ELF linker should do by default with DT_TEXTREL in an
+ executable or shared library.
+
* Add a command-line option for ELF linker, --warn-textrel, to warn that
DT_TEXTREL is set in a position-independent executable or shared object.
diff --git a/ld/config.in b/ld/config.in
index d93c9b0830..8cadcba60f 100644
--- a/ld/config.in
+++ b/ld/config.in
@@ -16,6 +16,12 @@
/* Define if you want compressed debug sections by default. */
#undef DEFAULT_FLAG_COMPRESS_DEBUG
+/* The default method for DT_TEXTREL check in ELF linker. */
+#undef DEFAULT_LD_TEXTREL_CHECK
+
+/* Define to 1 if DT_TEXTREL check is warning in ELF linker by default. */
+#undef DEFAULT_LD_TEXTREL_CHECK_WARNING
+
/* Define to 1 if you want to enable -z relro in ELF linker by default. */
#undef DEFAULT_LD_Z_RELRO
diff --git a/ld/configure b/ld/configure
index e1dbc95747..f766419d3f 100755
--- a/ld/configure
+++ b/ld/configure
@@ -831,6 +831,7 @@ enable_got
enable_compressed_debug_sections
enable_new_dtags
enable_relro
+enable_textrel_check
enable_separate_code
enable_default_hash_style
enable_werror
@@ -1498,6 +1499,8 @@ Optional Features:
compress debug sections by default]
--enable-new-dtags set DT_RUNPATH instead of DT_RPATH by default]
--enable-relro enable -z relro in ELF linker by default
+ --enable-textrel-check=[yes|no|warning|error]
+ enable DT_TEXTREL check in ELF linker
--enable-separate-code enable -z separate-code in ELF linker by default
--enable-default-hash-style={sysv,gnu,both}
use this default hash style
@@ -12032,7 +12035,7 @@ else
lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
lt_status=$lt_dlunknown
cat > conftest.$ac_ext <<_LT_EOF
-#line 12035 "configure"
+#line 12038 "configure"
#include "confdefs.h"
#if HAVE_DLFCN_H
@@ -12138,7 +12141,7 @@ else
lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
lt_status=$lt_dlunknown
cat > conftest.$ac_ext <<_LT_EOF
-#line 12141 "configure"
+#line 12144 "configure"
#include "confdefs.h"
#if HAVE_DLFCN_H
@@ -15876,6 +15879,16 @@ if test "${enable_relro+set}" = set; then :
esac
fi
+# Decide if DT_TEXTREL check should be enabled in ELF linker.
+ac_default_ld_textrel_check=unset
+# Check whether --enable-textrel-check was given.
+if test "${enable_textrel_check+set}" = set; then :
+ enableval=$enable_textrel_check; ac_default_ld_textrel_check=$enableval
+else
+ ac_default_ld_textrel_check=no
+fi
+
+
# Decide if -z separate-code should be enabled in ELF linker by default.
ac_default_ld_z_separate_code=unset
# Check whether --enable-separate-code was given.
@@ -17618,6 +17631,30 @@ cat >>confdefs.h <<_ACEOF
_ACEOF
+ac_default_ld_textrel_check_warning=0
+case "${ac_default_ld_textrel_check}" in
+ unset|no)
+ ac_default_ld_textrel_check=textrel_check_none
+ ;;
+ yes|warning)
+ ac_default_ld_textrel_check=textrel_check_warning
+ ac_default_ld_textrel_check_warning=1
+ ;;
+ error)
+ ac_default_ld_textrel_check=textrel_check_error
+ ;;
+esac
+
+cat >>confdefs.h <<_ACEOF
+#define DEFAULT_LD_TEXTREL_CHECK $ac_default_ld_textrel_check
+_ACEOF
+
+
+cat >>confdefs.h <<_ACEOF
+#define DEFAULT_LD_TEXTREL_CHECK_WARNING $ac_default_ld_textrel_check_warning
+_ACEOF
+
+
if test "${ac_default_ld_z_separate_code}" = unset; then
ac_default_ld_z_separate_code=0
fi
diff --git a/ld/configure.ac b/ld/configure.ac
index b5e849d84a..5d3757d20b 100644
--- a/ld/configure.ac
+++ b/ld/configure.ac
@@ -176,6 +176,14 @@ AC_ARG_ENABLE(relro,
no) ac_default_ld_z_relro=0 ;;
esac])dnl
+# Decide if DT_TEXTREL check should be enabled in ELF linker.
+ac_default_ld_textrel_check=unset
+AC_ARG_ENABLE([textrel-check],
+ AC_HELP_STRING([--enable-textrel-check=@<:@yes|no|warning|error@:>@],
+ [enable DT_TEXTREL check in ELF linker]),
+ [ac_default_ld_textrel_check=$enableval],
+ [ac_default_ld_textrel_check=no])
+
# Decide if -z separate-code should be enabled in ELF linker by default.
ac_default_ld_z_separate_code=unset
AC_ARG_ENABLE(separate-code,
@@ -447,6 +455,26 @@ AC_DEFINE_UNQUOTED(DEFAULT_LD_Z_RELRO,
$ac_default_ld_z_relro,
[Define to 1 if you want to enable -z relro in ELF linker by default.])
+ac_default_ld_textrel_check_warning=0
+case "${ac_default_ld_textrel_check}" in
+ unset|no)
+ ac_default_ld_textrel_check=textrel_check_none
+ ;;
+ yes|warning)
+ ac_default_ld_textrel_check=textrel_check_warning
+ ac_default_ld_textrel_check_warning=1
+ ;;
+ error)
+ ac_default_ld_textrel_check=textrel_check_error
+ ;;
+esac
+AC_DEFINE_UNQUOTED(DEFAULT_LD_TEXTREL_CHECK,
+ $ac_default_ld_textrel_check,
+ [The default method for DT_TEXTREL check in ELF linker.])
+AC_DEFINE_UNQUOTED(DEFAULT_LD_TEXTREL_CHECK_WARNING,
+ $ac_default_ld_textrel_check_warning,
+ [Define to 1 if DT_TEXTREL check is warning in ELF linker by default.])
+
if test "${ac_default_ld_z_separate_code}" = unset; then
ac_default_ld_z_separate_code=0
fi
diff --git a/ld/ldmain.c b/ld/ldmain.c
index 3499e7c784..e2c559ea3e 100644
--- a/ld/ldmain.c
+++ b/ld/ldmain.c
@@ -286,6 +286,7 @@ main (int argc, char **argv)
link_info.combreloc = TRUE;
link_info.strip_discarded = TRUE;
link_info.prohibit_multiple_definition_absolute = FALSE;
+ link_info.textrel_check = DEFAULT_LD_TEXTREL_CHECK;
link_info.emit_hash = DEFAULT_EMIT_SYSV_HASH;
link_info.emit_gnu_hash = DEFAULT_EMIT_GNU_HASH;
link_info.callbacks = &link_callbacks;
diff --git a/ld/lexsup.c b/ld/lexsup.c
index 3733a7c893..fbe200ffae 100644
--- a/ld/lexsup.c
+++ b/ld/lexsup.c
@@ -517,7 +517,12 @@ static const struct ld_option ld_options[] =
'\0', NULL, N_("Warn if start of section changes due to alignment"),
TWO_DASHES },
{ {"warn-textrel", no_argument, NULL, OPTION_WARN_TEXTREL},
- '\0', NULL, N_("Warn if outpout has DT_TEXTREL"),
+ '\0', NULL,
+#if DEFAULT_LD_TEXTREL_CHECK_WARNING
+ N_("Warn if outpout has DT_TEXTREL (default)"),
+#else
+ N_("Warn if outpout has DT_TEXTREL"),
+#endif
TWO_DASHES },
{ {"warn-shared-textrel", no_argument, NULL, OPTION_WARN_TEXTREL},
'\0', NULL, NULL, NO_HELP },
--
2.26.2
More information about the Binutils
mailing list