diff options
Diffstat (limited to 'gcc/gcc.c')
| -rw-r--r-- | gcc/gcc.c | 82 |
1 files changed, 69 insertions, 13 deletions
@@ -764,10 +764,23 @@ proper position among the other output files. */ /* We want %{T*} after %{L*} and %D so that it can be used to specify linker scripts which exist in user specified directories, or in standard directories. */ +/* We pass any -flto and -fwhopr flags on to the linker, which is expected + to understand them. In practice, this means it had better be collect2. */ #ifndef LINK_COMMAND_SPEC #define LINK_COMMAND_SPEC "\ %{!fsyntax-only:%{!c:%{!M:%{!MM:%{!E:%{!S:\ - %(linker) %l " LINK_PIE_SPEC "%X %{o*} %{A} %{d} %{e*} %{m} %{N} %{n} %{r}\ + %(linker) \ + %{use-linker-plugin: \ + -plugin %(linker_plugin_file) \ + -plugin-opt=%(lto_wrapper) \ + -plugin-opt=%(lto_gcc) \ + %{static|static-libgcc:-plugin-opt=-pass-through=%(lto_libgcc)} \ + %{O*:-plugin-opt=-O%*} \ + %{w:-plugin-opt=-w} \ + %{f*:-plugin-opt=-f%*} \ + } \ + %{flto} %{fwhopr} %l " LINK_PIE_SPEC \ + "%X %{o*} %{A} %{d} %{e*} %{m} %{N} %{n} %{r}\ %{s} %{t} %{u*} %{x} %{z} %{Z} %{!A:%{!nostdlib:%{!nostartfiles:%S}}}\ %{static:} %{L*} %(mfwrap) %(link_libgcc) %o\ %{fopenmp|ftree-parallelize-loops=*:%:include(libgomp.spec)%(link_gomp)} %(mflib)\ @@ -815,6 +828,10 @@ static const char *endfile_spec = ENDFILE_SPEC; static const char *startfile_spec = STARTFILE_SPEC; static const char *switches_need_spaces = SWITCHES_NEED_SPACES; static const char *linker_name_spec = LINKER_NAME; +static const char *linker_plugin_file_spec = ""; +static const char *lto_wrapper_spec = ""; +static const char *lto_gcc_spec = ""; +static const char *lto_libgcc_spec = ""; static const char *link_command_spec = LINK_COMMAND_SPEC; static const char *link_libgcc_spec = LINK_LIBGCC_SPEC; static const char *startfile_prefix_spec = STARTFILE_PREFIX_SPEC; @@ -891,11 +908,15 @@ static const char *asm_options = static const char *invoke_as = #ifdef AS_NEEDS_DASH_FOR_PIPED_INPUT -"%{fcompare-debug=*|fdump-final-insns=*:%:compare-debug-dump-opt()}\ - %{!S:-o %|.s |\n as %(asm_options) %|.s %A }"; +"%{!fwpa:\ + %{fcompare-debug=*|fdump-final-insns=*:%:compare-debug-dump-opt()}\ + %{!S:-o %|.s |\n as %(asm_options) %|.s %A }\ + }"; #else -"%{fcompare-debug=*|fdump-final-insns=*:%:compare-debug-dump-opt()}\ - %{!S:-o %|.s |\n as %(asm_options) %m.s %A }"; +"%{!fwpa:\ + %{fcompare-debug=*|fdump-final-insns=*:%:compare-debug-dump-opt()}\ + %{!S:-o %|.s |\n as %(asm_options) %m.s %A }\ + }"; #endif /* Some compilers have limits on line lengths, and the multilib_select @@ -1653,6 +1674,10 @@ static struct spec_list static_specs[] = INIT_STATIC_SPEC ("multilib_exclusions", &multilib_exclusions), INIT_STATIC_SPEC ("multilib_options", &multilib_options), INIT_STATIC_SPEC ("linker", &linker_name_spec), + INIT_STATIC_SPEC ("linker_plugin_file", &linker_plugin_file_spec), + INIT_STATIC_SPEC ("lto_wrapper", <o_wrapper_spec), + INIT_STATIC_SPEC ("lto_gcc", <o_gcc_spec), + INIT_STATIC_SPEC ("lto_libgcc", <o_libgcc_spec), INIT_STATIC_SPEC ("link_libgcc", &link_libgcc_spec), INIT_STATIC_SPEC ("md_exec_prefix", &md_exec_prefix), INIT_STATIC_SPEC ("md_startfile_prefix", &md_startfile_prefix), @@ -6834,14 +6859,6 @@ main (int argc, char **argv) multilib_defaults = XOBFINISH (&multilib_obstack, const char *); } - /* Set up to remember the pathname of gcc and any options - needed for collect. We use argv[0] instead of programname because - we need the complete pathname. */ - obstack_init (&collect_obstack); - obstack_grow (&collect_obstack, "COLLECT_GCC=", sizeof ("COLLECT_GCC=") - 1); - obstack_grow (&collect_obstack, argv[0], strlen (argv[0]) + 1); - xputenv (XOBFINISH (&collect_obstack, char *)); - #ifdef INIT_ENVIRONMENT /* Set up any other necessary machine specific environment variables. */ xputenv (INIT_ENVIRONMENT); @@ -7055,6 +7072,27 @@ main (int argc, char **argv) the subdirectory based on the options. */ set_multilib_dir (); + /* Set up to remember the pathname of gcc and any options + needed for collect. We use argv[0] instead of programname because + we need the complete pathname. */ + obstack_init (&collect_obstack); + obstack_grow (&collect_obstack, "COLLECT_GCC=", sizeof ("COLLECT_GCC=") - 1); + obstack_grow (&collect_obstack, argv[0], strlen (argv[0]) + 1); + xputenv (XOBFINISH (&collect_obstack, char *)); + + /* Set up to remember the pathname of the lto wrapper. */ + + lto_wrapper_spec = find_a_file (&exec_prefixes, "lto-wrapper", X_OK, false); + if (lto_wrapper_spec) + { + obstack_init (&collect_obstack); + obstack_grow (&collect_obstack, "COLLECT_LTO_WRAPPER=", + sizeof ("COLLECT_LTO_WRAPPER=") - 1); + obstack_grow (&collect_obstack, lto_wrapper_spec, + strlen (lto_wrapper_spec) + 1); + xputenv (XOBFINISH (&collect_obstack, char *)); + } + /* Warn about any switches that no pass was interested in. */ for (i = 0; (int) i < n_switches; i++) @@ -7475,6 +7513,7 @@ warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n\n" if (num_linker_inputs > 0 && error_count == 0 && print_subprocess_help < 2) { int tmp = execution_count; + const char *use_linker_plugin = "use-linker-plugin"; /* We'll use ld if we can't find collect2. */ if (! strcmp (linker_name_spec, "collect2")) @@ -7483,6 +7522,23 @@ warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n\n" if (s == NULL) linker_name_spec = "ld"; } + + if (switch_matches (use_linker_plugin, + use_linker_plugin + strlen (use_linker_plugin), 0)) + { + linker_plugin_file_spec = find_a_file (&exec_prefixes, + "liblto_plugin.so", X_OK, + false); + if (!linker_plugin_file_spec) + fatal ("-use-linker-plugin, but liblto_plugin.so not found."); + + lto_libgcc_spec = find_a_file (&startfile_prefixes, "libgcc.a", + R_OK, true); + if (!lto_libgcc_spec) + fatal ("could not find libgcc.a."); + } + lto_gcc_spec = argv[0]; + /* Rebuild the COMPILER_PATH and LIBRARY_PATH environment variables for collect. */ putenv_from_prefixes (&exec_prefixes, "COMPILER_PATH", false); |