Hi,
this patch allows that relocated const data is placed into .rdata. To provide
old behavior for older runtimes not supporting pseudo-relocation operating on
read-only sections, the option -fwritable-relocated-rdata can be used.
ChangeLog
2012-03-03 Kai Tietz <kti...@redhat.com>
* doc/invoke.texi (fwritable-relocated-rdata): Document
new Cygwin/MinGW target option.
* config/i386/winnt.c (i386_pe_unique_section): Ignore
reloc if flag -fwritable-relocated-rdata is not set.
(i386_pe_section_type_flags): Likewise.
* config/i386/cygming.opt (fwritable-relocated-rdata):
Add new flag variable flag_writable_rel_rdata.
Tested for i686-w64-mingw32, x86_64-w64-mingw32, and i686-pc-cygwin.
Ok for apply?
Regards,
Kai
Index: doc/invoke.texi
===================================================================
--- doc/invoke.texi (revision 184760)
+++ doc/invoke.texi (working copy)
@@ -13826,6 +13826,13 @@
Windows, as there the user32 API, which is used to set executable
privileges, isn't available.
+@item -fwritable-relocated-rdata
+@opindex fno-writable-relocated-rdata
+This option is available for MinGW and Cygwin targets. It specifies
+that relocated-data in read-only section is put into .data
+section. This is a necessary for older runtimes not supporting
+modification of .rdata sections for pseudo-relocation.
+
@item -mpe-aligned-commons
@opindex mpe-aligned-commons
This option is available for Cygwin and MinGW targets. It
Index: config/i386/winnt.c
===================================================================
--- config/i386/winnt.c (revision 184760)
+++ config/i386/winnt.c (working copy)
@@ -395,6 +395,10 @@
const char *name, *prefix;
char *string;
+ /* Ignore RELOC, if we are allowed to put relocated
+ const data into read-only section. */
+ if (!flag_writable_rel_rdata)
+ reloc = 0;
name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
name = i386_pe_strip_name_encoding_full (name);
@@ -441,6 +445,10 @@
unsigned int flags;
unsigned int **slot;
+ /* Ignore RELOC, if we are allowed to put relocated
+ const data into read-only section. */
+ if (!flag_writable_rel_rdata)
+ reloc = 0;
/* The names we put in the hashtable will always be the unique
versions given to us by the stringtable, so we can just use
their addresses as the keys. */
Index: config/i386/cygming.opt
===================================================================
--- config/i386/cygming.opt (revision 184760)
+++ config/i386/cygming.opt (working copy)
@@ -53,4 +53,8 @@
posix
Driver
+fwritable-relocated-rdata
+Common Report Var(flag_writable_rel_rdata) Init(0)
+Put relocated read-only data into .data section.
+
; Retain blank line above
