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compile: Add 'set compile-gcc'

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As discussed in
	How to use compile & execute function in GDB
	https://sourceware.org/ml/gdb/2015-04/msg00026.html

GDB currently searches for compilers on /usr/bin/ARCH-OS-gcc and
chooses a match from there.  However, it is not currently possible for
the user to override which compiler to use.  This is what this patch
implements.

It is also a sync between GCC's and GDB's interfaces.

gdb/ChangeLog
2017-08-23  Jan Kratochvil  <jan.kratochvil@redhat.com>

	* NEWS (Changes since GDB 7.9): Add set compile-gcc and show
	compile-gcc.
	* compile/compile.c (compile_gcc, show_compile_gcc): New.
	(compile_to_object): Implement compile_gcc.
	(_initialize_compile): Install "set compile-gcc".  Initialize
	compile_gcc.

gdb/doc/ChangeLog
2017-08-23  Jan Kratochvil  <jan.kratochvil@redhat.com>

	* gdb.texinfo (Compiling and Injecting Code): Add to subsection
	"Compiler search for the compile command" descriptions of set
	compile-gcc and show compile-gcc.

include/ChangeLog
2017-08-23  Jan Kratochvil  <jan.kratochvil@redhat.com>

	* gcc-interface.h (enum gcc_base_api_version): Update comment for
	GCC_FE_VERSION_1.
	(struct gcc_base_vtable): Rename set_arguments to set_arguments_v0.
	Add set_arguments, set_triplet_regexp and set_driver_filename.
This commit is contained in:
Jan Kratochvil 2017-02-21 13:32:56 -08:00 committed by Sergio Durigan Junior
parent e68c32d53e
commit 6e41ddec97
7 changed files with 155 additions and 31 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
gdb/ChangeLog
View File

@ -1,3 +1,12 @@
2017-08-23 Jan Kratochvil <jan.kratochvil@redhat.com>
* NEWS (Changes since GDB 8.0): Add set compile-gcc and show
compile-gcc.
* compile/compile.c (compile_gcc, show_compile_gcc): New.
(compile_to_object): Implement compile_gcc.
(_initialize_compile): Install "set compile-gcc". Initialize
compile_gcc.
2017-08-23 Jan Kratochvil <jan.kratochvil@redhat.com>
* compile/compile.c (compile_to_object): Conditionally call

4
gdb/NEWS
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@ -27,6 +27,10 @@ QStartupWithShell
* New commands
set|show compile-gcc
Set and show compilation command used for compiling and injecting code
with the 'compile' commands.
set debug separate-debug-file
show debug separate-debug-file
Control the display of debug output about separate debug file search.

63
gdb/compile/compile.c
View File

@ -335,6 +335,19 @@ append_args (int *argcp, char ***argvp, int argc, char **argv)
(*argvp)[(*argcp)] = NULL;
}
/* String for 'set compile-gcc' and 'show compile-gcc'. */
static char *compile_gcc;
/* Implement 'show compile-gcc'. */
static void
show_compile_gcc (struct ui_file *file, int from_tty,
struct cmd_list_element *c, const char *value)
{
fprintf_filtered (file, _("Compile command GCC driver filename is \"%s\".\n"),
value);
}
/* Return DW_AT_producer parsed for get_selected_frame () (if any).
Return NULL otherwise.
@ -452,8 +465,6 @@ compile_to_object (struct command_line *cmd, const char *cmd_string,
int ok;
FILE *src;
struct gdbarch *gdbarch = get_current_arch ();
const char *os_rx;
const char *arch_rx;
char *triplet_rx;
char *error_message;
@ -505,22 +516,39 @@ compile_to_object (struct command_line *cmd, const char *cmd_string,
if (compile_debug)
fprintf_unfiltered (gdb_stdlog, "debug output:\n\n%s", code.c_str ());
os_rx = osabi_triplet_regexp (gdbarch_osabi (gdbarch));
arch_rx = gdbarch_gnu_triplet_regexp (gdbarch);
if (compiler->fe->ops->version >= GCC_FE_VERSION_1)
compiler->fe->ops->set_verbose (compiler->fe, compile_debug);
/* Allow triplets with or without vendor set. */
triplet_rx = concat (arch_rx, "(-[^-]*)?-", os_rx, (char *) NULL);
make_cleanup (xfree, triplet_rx);
if (compile_gcc[0] != 0)
{
if (compiler->fe->ops->version < GCC_FE_VERSION_1)
error (_("Command 'set compile-gcc' requires GCC version 6 or higher "
"(libcc1 interface version 1 or higher)"));
compiler->fe->ops->set_driver_filename (compiler->fe, compile_gcc);
}
else
{
const char *os_rx = osabi_triplet_regexp (gdbarch_osabi (gdbarch));
const char *arch_rx = gdbarch_gnu_triplet_regexp (gdbarch);
/* Allow triplets with or without vendor set. */
triplet_rx = concat (arch_rx, "(-[^-]*)?-", os_rx, (char *) NULL);
make_cleanup (xfree, triplet_rx);
if (compiler->fe->ops->version >= GCC_FE_VERSION_1)
compiler->fe->ops->set_triplet_regexp (compiler->fe, triplet_rx);
}
/* Set compiler command-line arguments. */
get_args (compiler, gdbarch, &argc, &argv);
gdb_argv argv_holder (argv);
if (compiler->fe->ops->version >= GCC_FE_VERSION_1)
compiler->fe->ops->set_verbose (compiler->fe, compile_debug);
error_message = compiler->fe->ops->set_arguments (compiler->fe, triplet_rx,
argc, argv);
error_message = compiler->fe->ops->set_arguments (compiler->fe, argc, argv);
else
error_message = compiler->fe->ops->set_arguments_v0 (compiler->fe, triplet_rx,
argc, argv);
if (error_message != NULL)
{
make_cleanup (xfree, error_message);
@ -742,4 +770,17 @@ String quoting is parsed like in shell, for example:\n\
" -fno-stack-protector"
);
set_compile_args (compile_args, 0, NULL);
add_setshow_optional_filename_cmd ("compile-gcc", class_support,
&compile_gcc,
_("Set compile command "
"GCC driver filename"),
_("Show compile command "
"GCC driver filename"),
_("\
It should be absolute filename of the gcc executable.\n\
If empty the default target triplet will be searched in $PATH."),
NULL, show_compile_gcc, &setlist,
&showlist);
compile_gcc = xstrdup ("");
}

6
gdb/doc/ChangeLog
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@ -1,3 +1,9 @@
2017-08-23 Jan Kratochvil <jan.kratochvil@redhat.com>
* gdb.texinfo (Compiling and Injecting Code): Add to subsection
"Compiler search for the compile command" descriptions of set
compile-gcc and show compile-gcc.
2017-08-07 Weimin Pan <weimin.pan@oracle.com>
* gdb.texinfo (Architectures): Add new Sparc64 section to document

36
gdb/doc/gdb.texinfo
View File

@ -18154,13 +18154,15 @@ will print to the console.
@subsection Compiler search for the @code{compile} command
@value{GDBN} needs to find @value{NGCC} for the inferior being debugged which
may not be obvious for remote targets of different architecture than where
@value{GDBN} is running. Environment variable @code{PATH} (@code{PATH} from
shell that executed @value{GDBN}, not the one set by @value{GDBN}
command @code{set environment}). @xref{Environment}. @code{PATH} on
@value{GDBN} needs to find @value{NGCC} for the inferior being debugged
which may not be obvious for remote targets of different architecture
than where @value{GDBN} is running. Environment variable @code{PATH} on
@value{GDBN} host is searched for @value{NGCC} binary matching the
target architecture and operating system.
target architecture and operating system. This search can be overriden
by @code{set compile-gcc} @value{GDBN} command below. @code{PATH} is
taken from shell that executed @value{GDBN}, it is not the value set by
@value{GDBN} command @code{set environment}). @xref{Environment}.
Specifically @code{PATH} is searched for binaries matching regular expression
@code{@var{arch}(-[^-]*)?-@var{os}-gcc} according to the inferior target being
@ -18170,6 +18172,28 @@ example both @code{i386} and @code{x86_64} targets look for pattern
for pattern @code{s390x?}. @var{os} is currently supported only for
pattern @code{linux(-gnu)?}.
On Posix hosts the compiler driver @value{GDBN} needs to find also
shared library @file{libcc1.so} from the compiler. It is searched in
default shared library search path (overridable with usual environment
variable @code{LD_LIBRARY_PATH}), unrelated to @code{PATH} or @code{set
compile-gcc} settings. Contrary to it @file{libcc1plugin.so} is found
according to the installation of the found compiler --- as possibly
specified by the @code{set compile-gcc} command.
@table @code
@item set compile-gcc
@cindex compile command driver filename override
Set compilation command used for compiling and injecting code with the
@code{compile} commands. If this option is not set (it is set to
an empty string), the search described above will occur --- that is the
default.
@item show compile-gcc
Displays the current compile command @value{NGCC} driver filename.
If set, it is the main command @command{gcc}, found usually for example
under name @file{x86_64-linux-gnu-gcc}.
@end table
@node GDB Files
@chapter @value{GDBN} Files

7
include/ChangeLog
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@ -1,3 +1,10 @@
2017-08-23 Jan Kratochvil <jan.kratochvil@redhat.com>
* gcc-interface.h (enum gcc_base_api_version): Update comment for
GCC_FE_VERSION_1.
(struct gcc_base_vtable): Rename set_arguments to set_arguments_v0.
Add set_arguments, set_triplet_regexp and set_driver_filename.
2017-08-23 Jan Kratochvil <jan.kratochvil@redhat.com>
* gcc-interface.h (enum gcc_base_api_version): Add

61
include/gcc-interface.h
View File

@ -46,7 +46,9 @@ enum gcc_base_api_version
{
GCC_FE_VERSION_0 = 0,
/* Deprecated method compile_v0. Added method set_verbose and compile. */
/* Deprecated methods set_arguments_v0 and compile_v0. Added methods
set_arguments, set_triplet_regexp, set_driver_filename, set_verbose and
compile. */
GCC_FE_VERSION_1 = 1,
};
@ -67,20 +69,12 @@ struct gcc_base_vtable
unsigned int version;
/* Set the compiler's command-line options for the next compilation.
TRIPLET_REGEXP is a regular expression that is used to match the
configury triplet prefix to the compiler.
The arguments are copied by GCC. ARGV need not be
NULL-terminated. The arguments must be set separately for each
compilation; that is, after a compile is requested, the
previously-set arguments cannot be reused.
/* Deprecated GCC_FE_VERSION_0 variant of the GCC_FE_VERSION_1
methods set_triplet_regexp and set_arguments. */
This returns NULL on success. On failure, returns a malloc()d
error message. The caller is responsible for freeing it. */
char *(*set_arguments) (struct gcc_base_context *self,
const char *triplet_regexp,
int argc, char **argv);
char *(*set_arguments_v0) (struct gcc_base_context *self,
const char *triplet_regexp,
int argc, char **argv);
/* Set the file name of the program to compile. The string is
copied by the method implementation, but the caller must
@ -125,6 +119,45 @@ struct gcc_base_vtable
int /* bool */ (*compile) (struct gcc_base_context *self,
const char *filename);
/* Set the compiler's command-line options for the next compilation.
The arguments are copied by GCC. ARGV need not be
NULL-terminated. The arguments must be set separately for each
compilation; that is, after a compile is requested, the
previously-set arguments cannot be reused.
This returns NULL on success. On failure, returns a malloc()d
error message. The caller is responsible for freeing it.
This method is only available since GCC_FE_VERSION_1. */
char *(*set_arguments) (struct gcc_base_context *self,
int argc, char **argv);
/* Set TRIPLET_REGEXP as a regular expression that is used to match
the configury triplet prefix to the compiler. Calling this method
overrides possible previous call of itself or set_driver_filename.
This returns NULL on success. On failure, returns a malloc()d
error message. The caller is responsible for freeing it.
This method is only available since GCC_FE_VERSION_1. */
char *(*set_triplet_regexp) (struct gcc_base_context *self,
const char *triplet_regexp);
/* DRIVER_FILENAME should be filename of the gcc compiler driver
program. It will be searched in PATH components like
TRIPLET_REGEXP. Calling this method overrides possible previous
call of itself or set_triplet_regexp.
This returns NULL on success. On failure, returns a malloc()d
error message. The caller is responsible for freeing it.
This method is only available since GCC_FE_VERSION_1. */
char *(*set_driver_filename) (struct gcc_base_context *self,
const char *driver_filename);
};
/* The GCC object. */