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[patch+7.9] compile: Filter out -fpreprocessed
- From: Jan Kratochvil <jan dot kratochvil at redhat dot com>
- To: gdb-patches at sourceware dot org
- Date: Fri, 16 Jan 2015 23:42:34 +0100
- Subject: [patch+7.9] compile: Filter out -fpreprocessed
- Authentication-results: sourceware.org; auth=none
Hi,
with global system gcc-5.0 if one also installs ccache (needing a different
patch for -fplugin=libcc1plugin) it breaks as GDB will read from inferior
DW_AT_producer containing -fpreprocessed (due to ccache used to compile the
inferior).
<c> DW_AT_producer : (indirect string, offset: 0x52): GNU C11 5.0.0 20150114 (Red Hat 5.0.0-0.1) -fpreprocessed -mtune=generic -march=x86-64 -g
It is wrong that gcc puts -fpreprocessed into DW_AT_producer - I may post a gcc
patch for it. But even if it gets accepted there are already built inferiors
out there which GDB could be compatible (for the 'compile' mode) with.
gdb.compile/*.exp PASSes for it on {x86_64,x86_64-m32}-fedora22pre-linux-gnu.
Thanks,
Jan
gdb/ChangeLog
2015-01-16 Jan Kratochvil <jan.kratochvil@redhat.com>
Filter out inferior gcc option -fpreprocessed.
* compile/compile.c (filter_args): New function.
(get_args): Use it.
diff --git a/gdb/compile/compile.c b/gdb/compile/compile.c
index ccac49d..ecbd15c 100644
--- a/gdb/compile/compile.c
+++ b/gdb/compile/compile.c
@@ -324,6 +324,26 @@ get_selected_pc_producer_options (void)
return cs;
}
+/* Filter out unwanted options from *ARGCP and ARGV. */
+
+static void
+filter_args (int *argcp, char **argv)
+{
+ char **destv;
+
+ for (destv = argv; *argv != NULL; argv++)
+ {
+ /* -fpreprocessed may get in commonly from ccache. */
+ if (strcmp (*argv, "-fpreprocessed") == 0)
+ {
+ (*argcp)--;
+ continue;
+ }
+ *destv++ = *argv;
+ }
+ *destv = NULL;
+}
+
/* Produce final vector of GCC compilation options. First element is target
size ("-m64", "-m32" etc.), optionally followed by DW_AT_producer options
and then compile-args string GDB variable. */
@@ -346,6 +366,7 @@ get_args (const struct compile_instance *compiler, struct gdbarch *gdbarch,
char **argv_producer;
build_argc_argv (cs_producer_options, &argc_producer, &argv_producer);
+ filter_args (&argc_producer, argv_producer);
append_args (argcp, argvp, argc_producer, argv_producer);
freeargv (argv_producer);
}