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Print warning diagnostics for -flto issues.

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gcc/ChangeLog:

	* lto-wrapper.c (print_lto_docs_link): New function.
	(run_gcc): Print warning about missing job server detection
	after we know NR of partitions. Do the same for -flto{,=1}.
	* opts.c (get_option_html_page): Support -flto option.
This commit is contained in:
Martin Liska 2021-04-22 16:27:19 +02:00
parent 227a2ecf66
commit 7d7d925d0d
2 changed files with 42 additions and 3 deletions
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39
gcc/lto-wrapper.c
View file

@ -48,6 +48,7 @@ along with GCC; see the file COPYING3. If not see
#include "simple-object.h"
#include "lto-section-names.h"
#include "collect-utils.h"
#include "opts-diagnostic.h"
/* Environment variable, used for passing the names of offload targets from GCC
driver to lto-wrapper. */
@ -1322,6 +1323,23 @@ jobserver_active_p (void)
return JS_PREFIX "cannot access %<" JS_NEEDLE "%> file descriptors";
}
/* Print link to -flto documentation with a hint message. */
void
print_lto_docs_link ()
{
const char *url = get_option_url (NULL, OPT_flto);
pretty_printer pp;
pp.url_format = URL_FORMAT_DEFAULT;
pp_string (&pp, "see the ");
pp_begin_url (&pp, url);
pp_string (&pp, "%<-flto%> option documentation");
pp_end_url (&pp);
pp_string (&pp, " for more information");
inform (UNKNOWN_LOCATION, pp_formatted_text (&pp));
}
/* Test that a make command is present and working, return true if so. */
static bool
@ -1356,8 +1374,10 @@ run_gcc (unsigned argc, char *argv[])
char *collect_gcc_options;
int parallel = 0;
int jobserver = 0;
bool jobserver_requested = false;
int auto_parallel = 0;
bool no_partition = false;
const char *jobserver_error = NULL;
vec<cl_decoded_option> fdecoded_options;
fdecoded_options.create (16);
vec<cl_decoded_option> offload_fdecoded_options = vNULL;
@ -1502,6 +1522,7 @@ run_gcc (unsigned argc, char *argv[])
{
parallel = 1;
jobserver = 1;
jobserver_requested = true;
}
else if (strcmp (option->arg, "auto") == 0)
{
@ -1556,15 +1577,15 @@ run_gcc (unsigned argc, char *argv[])
{
lto_mode = LTO_MODE_LTO;
jobserver = 0;
jobserver_requested = false;
auto_parallel = 0;
parallel = 0;
}
else
{
const char *jobserver_error = jobserver_active_p ();
jobserver_error = jobserver_active_p ();
if (jobserver && jobserver_error != NULL)
{
warning (0, jobserver_error);
/* Fall back to auto parallelism. */
jobserver = 0;
auto_parallel = 1;
@ -1879,6 +1900,20 @@ cont:
maybe_unlink (ltrans_output_file);
ltrans_output_file = NULL;
if (nr > 1)
{
if (jobserver_requested && jobserver_error != NULL)
{
warning (0, jobserver_error);
print_lto_docs_link ();
}
else if (parallel == 0)
{
warning (0, "using serial compilation of %d LTRANS jobs", nr);
print_lto_docs_link ();
}
}
if (parallel)
{
makefile = make_temp_file (".mk");

6
gcc/opts.c
View file

@ -3243,9 +3243,13 @@ get_option_html_page (int option_index)
const cl_option *cl_opt = &cl_options[option_index];
/* Analyzer options are on their own page. */
if (strstr(cl_opt->opt_text, "analyzer-"))
if (strstr (cl_opt->opt_text, "analyzer-"))
return "gcc/Static-Analyzer-Options.html";
/* Handle -flto= option. */
if (strstr (cl_opt->opt_text, "flto"))
return "gcc/Optimize-Options.html";
#ifdef CL_Fortran
if ((cl_opt->flags & CL_Fortran) != 0
/* If it is option common to both C/C++ and Fortran, it is documented