--- /dev/null
+/* Subroutines for the gcc driver.
+ Copyright (C) 2011 Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 3, or (at your option)
+any later version.
+
+GCC 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 General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING3. If not see
+<http://www.gnu.org/licenses/>. */
+
+#include "config.h"
+#include "system.h"
+#include "coretypes.h"
+#include "tm.h"
+#include "configargs.h"
+
+struct vendor_cpu {
+ const char *part_no;
+ const char *arch_name;
+ const char *cpu_name;
+};
+
+static struct vendor_cpu arm_cpu_table[] = {
+ {"0x926", "armv5te", "arm926ej-s"},
+ {"0xa26", "armv5te", "arm1026ej-s"},
+ {"0xb02", "armv6k", "mpcore"},
+ {"0xb36", "armv6j", "arm1136j-s"},
+ {"0xb56", "armv6t2", "arm1156t2-s"},
+ {"0xb76", "armv6zk", "arm1176jz-s"},
+ {"0xc05", "armv7-a", "cortex-a5"},
+ {"0xc08", "armv7-a", "cortex-a8"},
+ {"0xc09", "armv7-a", "cortex-a9"},
+ {"0xc0f", "armv7-a", "cortex-a15"},
+ {"0xc14", "armv7-r", "cortex-r4"},
+ {"0xc15", "armv7-r", "cortex-r5"},
+ {"0xc20", "armv6-m", "cortex-m0"},
+ {"0xc21", "armv6-m", "cortex-m1"},
+ {"0xc23", "armv7-m", "cortex-m3"},
+ {"0xc24", "armv7e-m", "cortex-m4"},
+ {NULL, NULL, NULL}
+};
+
+struct {
+ const char *vendor_no;
+ const struct vendor_cpu *vendor_parts;
+} vendors[] = {
+ {"0x41", arm_cpu_table},
+ {NULL, NULL}
+};
+
+/* This will be called by the spec parser in gcc.c when it sees
+ a %:local_cpu_detect(args) construct. Currently it will be called
+ with either "arch", "cpu" or "tune" as argument depending on if
+ -march=native, -mcpu=native or -mtune=native is to be substituted.
+
+ It returns a string containing new command line parameters to be
+ put at the place of the above two options, depending on what CPU
+ this is executed. E.g. "-march=armv7-a" on a Cortex-A8 for
+ -march=native. If the routine can't detect a known processor,
+ the -march or -mtune option is discarded.
+
+ ARGC and ARGV are set depending on the actual arguments given
+ in the spec. */
+const char *
+host_detect_local_cpu (int argc, const char **argv)
+{
+ const char *val = NULL;
+ char buf[128];
+ FILE *f;
+ bool arch;
+ const struct vendor_cpu *cpu_table = NULL;
+
+ if (argc < 1)
+ goto not_found;
+
+ arch = strcmp (argv[0], "arch") == 0;
+ if (!arch && strcmp (argv[0], "cpu") != 0 && strcmp (argv[0], "tune"))
+ goto not_found;
+
+ f = fopen ("/proc/cpuinfo", "r");
+ if (f == NULL)
+ goto not_found;
+
+ while (fgets (buf, sizeof (buf), f) != NULL)
+ {
+ /* Ensure that CPU implementer is ARM (0x41). */
+ if (strncmp (buf, "CPU implementer", sizeof ("CPU implementer") - 1) == 0)
+ {
+ int i;
+ for (i = 0; vendors[i].vendor_no != NULL; i++)
+ if (strstr (buf, vendors[i].vendor_no) != NULL)
+ {
+ cpu_table = vendors[i].vendor_parts;
+ break;
+ }
+ }
+
+ /* Detect arch/cpu. */
+ if (strncmp (buf, "CPU part", sizeof ("CPU part") - 1) == 0)
+ {
+ int i;
+
+ if (cpu_table == NULL)
+ goto not_found;
+
+ for (i = 0; cpu_table[i].part_no != NULL; i++)
+ if (strstr (buf, cpu_table[i].part_no) != NULL)
+ {
+ val = arch ? cpu_table[i].arch_name : cpu_table[i].cpu_name;
+ break;
+ }
+ break;
+ }
+ }
+
+ fclose (f);
+
+ if (val == NULL)
+ goto not_found;
+
+ return concat ("-m", argv[0], "=", val, NULL);
+
+not_found:
+ {
+ unsigned int i;
+ unsigned int opt;
+ const char *search[] = {NULL, "arch"};
+ search[0] = argv[0];
+ for (opt = 0; opt < ARRAY_SIZE (search); opt++)
+ for (i = 0; i < ARRAY_SIZE (configure_default_options); i++)
+ if (strcmp (configure_default_options[i].name, search[opt]) == 0)
+ return concat ("-m", search[opt], "=",
+ configure_default_options[i].value, NULL);
+ return NULL;
+ }
+}
@samp{fa526}, @samp{fa626},
@samp{fa606te}, @samp{fa626te}, @samp{fmp626}, @samp{fa726te}.
+
@option{-mcpu=generic-@var{arch}} is also permissible, and is
equivalent to @option{-march=@var{arch} -mtune=generic-@var{arch}}.
See @option{-mtune} for more information.
+@option{-mcpu=native} causes the compiler to auto-detect the CPU
+of the build computer. At present, this feature is only supported on
+Linux, and not all architectures are recognised. If the auto-detect is
+unsuccessful the option has no effect.
+
@item -mtune=@var{name}
@opindex mtune
This option is very similar to the @option{-mcpu=} option, except that
range, and avoiding performance pitfalls of other CPUs. The effects of
this option may change in future GCC versions as CPU models come and go.
+@option{-mtune=native} causes the compiler to auto-detect the CPU
+of the build computer. At present, this feature is only supported on
+Linux, and not all architectures are recognised. If the auto-detect is
+unsuccessful the option has no effect.
+
@item -march=@var{name}
@opindex march
This specifies the name of the target ARM architecture. GCC uses this
@samp{armv7}, @samp{armv7-a}, @samp{armv7-r}, @samp{armv7-m},
@samp{iwmmxt}, @samp{iwmmxt2}, @samp{ep9312}.
+@option{-march=native} causes the compiler to auto-detect the architecture
+of the build computer. At present, this feature is only supported on
+Linux, and not all architectures are recognised. If the auto-detect is
+unsuccessful the option has no effect.
+
@item -mfpu=@var{name}
@itemx -mfpe=@var{number}
@itemx -mfp=@var{number}
projects / thirdparty / gcc.git / commitdiff
