sysdeps/init_array: Add PREINIT_FUNCTION to crti.S

The RISC-V port contains a crti.S that simply contains a link to
PREINIT_FUNCTION (when defined).  As this should be entirely generic,
Joseph Myers suggested that we update the generic init_array version to
contain this.  Since RISC-V is the only user of init_array this won't
break any existing ports.

2018-01-29  Palmer Dabbelt  <palmer@sifive.com>

        * sysdeps/init_array/crti.S (.section .init_array): Add
        PREINIT_FUNCTION when defined.

diff --git a/ChangeLog b/ChangeLog
index 3a38045869bf69ab504cef0690b6ea052ae00c68..ed498e8df3f0918018669f69ad1a788a3409df6e 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2018-01-29  Palmer Dabbelt  <palmer@sifive.com>
+
+       * sysdeps/init_array/crti.S (.section .init_array): Add
+       PREINIT_FUNCTION when defined.
+
 2018-01-29  Florian Weimer  <fweimer@redhat.com>
 
        [BZ #22701]

diff --git a/sysdeps/init_array/crti.S b/sysdeps/init_array/crti.S
index 0a6e9fd953389f350cdd182e944599cd816642ff..145c918f939b7917c84f775407c62dc45d2e70b5 100644 (file)
--- a/sysdeps/init_array/crti.S
+++ b/sysdeps/init_array/crti.S
@@ -11,3 +11,17 @@
    But new configurations without compatibility concerns for
    toolchains without .init_array support can use this to avoid the
    superfluous .init and .fini boilerplate code.  */
+
+#ifdef PREINIT_FUNCTION
+
+#if PREINIT_FUNCTION_WEAK
+# error PREINIT_FUNCTION_WEAK is unsupported
+#endif
+
+/* This arranges for PREINIT_FUNCTION to be called upon loading a library that
+   contains crti.o.  */
+
+       .section .init_array,"a",%init_array
+       .dc.a PREINIT_FUNCTION
+
+#endif