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GNU C Library master sources branch roland/csu-init_array created. glibc-2.17-299-g67c1de6


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The branch, roland/csu-init_array has been created
        at  67c1de66fa17ea9db3c446df939c92a34424bec3 (commit)

- Log -----------------------------------------------------------------
http://sources.redhat.com/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=67c1de66fa17ea9db3c446df939c92a34424bec3

commit 67c1de66fa17ea9db3c446df939c92a34424bec3
Author: Roland McGrath <roland@hack.frob.com>
Date:   Wed Feb 27 15:10:31 2013 -0800

    Add sysdeps/init_array to produce empty crt[in].o and use .preinit_array for gcrt1.o

diff --git a/ChangeLog b/ChangeLog
index df58724..11d18ff 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,13 @@
 2013-02-27  Roland McGrath  <roland@hack.frob.com>
 
+	* csu/gmon-start.c [GMON_START_ARRAY_SECTION]: Don't define
+	__gmon_start__ as global, but as static with a .preinit_array pointer.
+	* sysdeps/init_array/gmon-start.c: New file.  Use that.
+	* sysdeps/init_array/crti.S: New file, empty except for comments.
+	* sysdeps/init_array/crtn.S: Likewise.
+
+2013-02-27  Roland McGrath  <roland@hack.frob.com>
+
 	* csu/gmon-start.c: Add special exception to license text.
 
 2013-02-27  Richard Henderson  <rth@redhat.com>
diff --git a/csu/gmon-start.c b/csu/gmon-start.c
index 54495eb..0c18321 100644
--- a/csu/gmon-start.c
+++ b/csu/gmon-start.c
@@ -59,10 +59,17 @@ extern char etext[];
 # endif
 #endif
 
+#ifdef GMON_START_ARRAY_SECTION
+static void __gmon_start__ (void);
+static void (*const gmon_start_initializer) (void)
+  __attribute__ ((used, section (GMON_START_ARRAY_SECTION))) = &__gmon_start__;
+static
+#else
 /* We cannot use the normal constructor mechanism to call
    __gmon_start__ because gcrt1.o appears before crtbegin.o in the link.
    Instead crti.o calls it specially.  */
 extern void __gmon_start__ (void);
+#endif
 
 void
 __gmon_start__ (void)
diff --git a/sysdeps/init_array/crti.S b/sysdeps/init_array/crti.S
new file mode 100644
index 0000000..0a6e9fd
--- /dev/null
+++ b/sysdeps/init_array/crti.S
@@ -0,0 +1,13 @@
+/* Dummy crti file.
+
+   In this configuration, crti.o and crtn.o are both empty because the
+   .init_array/.fini_array sections are used exclusively.
+
+   Older ports cannot use this because even if the linker used to
+   build libc itself has .init_array support, we don't want to produce
+   a crt[in].o that presume a linker that new will be used to link
+   other things later.
+
+   But new configurations without compatibility concerns for
+   toolchains without .init_array support can use this to avoid the
+   superfluous .init and .fini boilerplate code.  */
diff --git a/sysdeps/init_array/crtn.S b/sysdeps/init_array/crtn.S
new file mode 100644
index 0000000..6f70e77
--- /dev/null
+++ b/sysdeps/init_array/crtn.S
@@ -0,0 +1,13 @@
+/* Dummy crtn file.
+
+   In this configuration, crti.o and crtn.o are both empty because the
+   .init_array/.fini_array sections are used exclusively.
+
+   Older ports cannot use this because even if the linker used to
+   build libc itself has .init_array support, we don't want to produce
+   a crt[in].o that presume a linker that new will be used to link
+   other things later.
+
+   But new configurations without compatibility concerns for
+   toolchains without .init_array support can use this to avoid the
+   superfluous .init and .fini boilerplate code.  */
diff --git a/sysdeps/init_array/gmon-start.c b/sysdeps/init_array/gmon-start.c
new file mode 100644
index 0000000..5c5e7c5
--- /dev/null
+++ b/sysdeps/init_array/gmon-start.c
@@ -0,0 +1,41 @@
+/* gmon startup hook using .preinit_array.
+   Copyright (C) 2013 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   In addition to the permissions in the GNU Lesser General Public
+   License, the Free Software Foundation gives you unlimited
+   permission to link the compiled version of this file with other
+   programs, and to distribute those programs without any restriction
+   coming from the use of this file.  (The GNU Lesser General Public
+   License restrictions do apply in other respects; for example, they
+   cover modification of the file, and distribution when not linked
+   into another program.)
+
+   Note that people who make modified versions of this file are not
+   obligated to grant this special exception for their modified
+   versions; it is their choice whether to do so.  The GNU Lesser
+   General Public License gives permission to release a modified
+   version without this exception; this exception also makes it
+   possible to release a modified version which carries forward this
+   exception.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+/* Instead of defining __gmon_start__ globally in gcrt1.o, we make it
+   static and just put a pointer to it into the .preinit_array section.  */
+
+#defined GMON_START_ARRAY_SECTION	".preinit_array"
+
+#include <csu/gmon-start.c>

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