| /* Additional functions for the GCC driver on Darwin native. |
| Copyright (C) 2006-2020 Free Software Foundation, Inc. |
| Contributed by Apple Computer 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 "libiberty.h" |
| #include "system.h" |
| #include "coretypes.h" |
| #include "tm.h" |
| #include "opts.h" |
| #include "diagnostic-core.h" |
| |
| /* Validate a version string (either given on the command line or, perhaps |
| as MACOSX_DEPLOYMENT_TARGET). |
| |
| The specs %version-compare() function doesn't accept leading '0' on |
| numbers so strip them out. Do sanity checking here too. |
| |
| Return: |
| * original string means it was OK and we didn't want to change it. |
| * new string means it was OK but we rewrote it to avoid possible format |
| problems. |
| * NULL means we didn't like what we saw. |
| */ |
| |
| static const char * |
| validate_macosx_version_min (const char *version_str) |
| { |
| size_t version_len; |
| unsigned long major, minor = 0, tiny = 0; |
| char *end; |
| const char *old_version = version_str; |
| bool need_rewrite = false; |
| |
| version_len = strlen (version_str); |
| if (version_len < 2) /* The minimum would be 11 */ |
| return NULL; |
| |
| /* Version string must consist of digits and periods only. */ |
| if (strspn (version_str, "0123456789.") != version_len) |
| return NULL; |
| |
| if (!ISDIGIT (version_str[0]) || !ISDIGIT (version_str[version_len - 1])) |
| return NULL; |
| |
| if (version_str[0] == '0') |
| need_rewrite = true; |
| |
| major = strtoul (version_str, &end, 10); |
| |
| /* macOS 10, 11, and 12 are known. clang accepts up to 99. */ |
| if (major < 10 || major > 99) |
| return NULL; |
| |
| /* Skip a separating period, if there's one. */ |
| version_str = end + ((*end == '.') ? 1 : 0); |
| |
| if (major > 10 && *end != '\0' && !ISDIGIT (version_str[0])) |
| /* For macOS 11+, we allow just the major number, but if the minor is |
| there it must be numeric. */ |
| return NULL; |
| else if (major > 10 && *end == '\0') |
| /* We will rewrite 11 => 11.0.0. */ |
| need_rewrite = true; |
| else if (major == 10 && (*end == '\0' || !ISDIGIT (version_str[0]))) |
| /* Otherwise, minor version components must be present and numeric. */ |
| return NULL; |
| |
| /* If we have one or more leading zeros on a component, then rewrite the |
| version string. */ |
| if (*end != '\0' && version_str[0] == '0' && version_str[1] != '\0' |
| && version_str[1] != '.') |
| need_rewrite = true; |
| |
| minor = strtoul (version_str, &end, 10); |
| version_str = end + ((*end == '.') ? 1 : 0); |
| if (minor > 99) |
| return NULL; |
| |
| /* If 'tiny' is present it must be numeric. */ |
| if (*end != '\0' && !ISDIGIT (version_str[0])) |
| return NULL; |
| |
| /* If we have one or more leading zeros on a component, then rewrite the |
| version string. */ |
| if (*end != '\0' && version_str[0] == '0' |
| && version_str[1] != '\0') |
| need_rewrite = true; |
| |
| tiny = strtoul (version_str, &end, 10); |
| if (tiny > 99) |
| return NULL; |
| |
| /* Version string must contain no more than three tokens. */ |
| if (*end != '\0') |
| return NULL; |
| |
| if (need_rewrite) |
| { |
| char *new_version; |
| asprintf (&new_version, "%2lu.%lu.%lu", major, minor, tiny); |
| return new_version; |
| } |
| |
| return old_version; |
| } |
| |
| #ifndef CROSS_DIRECTORY_STRUCTURE |
| #include <sys/sysctl.h> |
| #include "xregex.h" |
| |
| /* Determine the version of the running OS. |
| We only look at the first two components (ignoring the patch one) and |
| report NN.MM.0 where NN is currently either 10 or 11 and MM is the OS |
| minor release number. |
| If we can't parse what the kernel gives us, warn the user, and do nothing. */ |
| |
| static char * |
| darwin_find_version_from_kernel (void) |
| { |
| char osversion[32]; |
| size_t osversion_len = sizeof (osversion) - 1; |
| static int osversion_name[2] = { CTL_KERN, KERN_OSRELEASE }; |
| int major_vers; |
| char * version_p; |
| char * new_flag; |
| |
| if (sysctl (osversion_name, ARRAY_SIZE (osversion_name), osversion, |
| &osversion_len, NULL, 0) == -1) |
| { |
| warning (0, "sysctl for kern.osversion failed: %m"); |
| return NULL; |
| } |
| |
| /* Try to parse the first two parts of the OS version number. Warn |
| user and return if it doesn't make sense. */ |
| if (! ISDIGIT (osversion[0])) |
| goto parse_failed; |
| major_vers = osversion[0] - '0'; |
| version_p = osversion + 1; |
| if (ISDIGIT (*version_p)) |
| major_vers = major_vers * 10 + (*version_p++ - '0'); |
| if (*version_p++ != '.') |
| goto parse_failed; |
| |
| /* Darwin20 sees a transition to macOS 11. In this, it seems that the |
| mapping to macOS minor version and patch level is now always 0, 0 |
| (at least for macOS 11 and 12). */ |
| if (major_vers >= 20) |
| { |
| /* Apple clang doesn't include the minor version or the patch level |
| in the object file, nor does it pass it to ld */ |
| asprintf (&new_flag, "%d.00.00", major_vers - 9); |
| } |
| else if (major_vers - 4 <= 4) |
| /* On 10.4 and earlier, the old linker is used which does not |
| support three-component system versions. |
| FIXME: we should not assume this - a newer linker could be used. */ |
| asprintf (&new_flag, "10.%d", major_vers - 4); |
| else |
| /* Although the newer linker supports three-component system |
| versions, there's no guarantee that the minor version component |
| of the kernel and the system are the same. Apple's clang always |
| uses 0 as the minor version: do the same. */ |
| asprintf (&new_flag, "10.%d.0", major_vers - 4); |
| |
| return new_flag; |
| |
| parse_failed: |
| warning (0, "couldn%'t understand kern.osversion %q.*s", |
| (int) osversion_len, osversion); |
| return NULL; |
| } |
| #endif |
| |
| /* When running on a Darwin system and using that system's headers and |
| libraries, default the -mmacosx-version-min flag to be the version |
| of the system on which the compiler is running. |
| |
| When building cross or native cross compilers, default to the OSX |
| version of the target (as provided by the most specific target header |
| included in tm.h). This may be overidden by setting the flag explicitly |
| (or by the MACOSX_DEPLOYMENT_TARGET environment). */ |
| |
| static const char * |
| darwin_default_min_version (void) |
| { |
| /* Try to retrieve the deployment target from the environment. */ |
| const char *new_flag = getenv ("MACOSX_DEPLOYMENT_TARGET"); |
| |
| /* Apparently, an empty string for MACOSX_DEPLOYMENT_TARGET means |
| "use the default". Or, possibly "use 10.1". We choose |
| to ignore the environment variable, as if it was never set. */ |
| if (new_flag == NULL || new_flag[0] == 0) |
| #ifndef CROSS_DIRECTORY_STRUCTURE |
| /* Try to find the version from the kernel, if we fail - we print a |
| message and give up. */ |
| new_flag = darwin_find_version_from_kernel (); |
| #else |
| /* For cross-compilers, default to a minimum version determined by |
| the configuration. */ |
| new_flag = DEF_MIN_OSX_VERSION; |
| #endif /* CROSS_DIRECTORY_STRUCTURE */ |
| |
| if (new_flag != NULL) |
| { |
| const char *checked = validate_macosx_version_min (new_flag); |
| if (checked == NULL) |
| { |
| warning (0, "could not understand version %s", new_flag); |
| return NULL; |
| } |
| new_flag = xstrndup (checked, strlen (checked)); |
| } |
| return new_flag; |
| } |
| |
| /* See if we can find the sysroot from the SDKROOT environment variable. */ |
| |
| static const char * |
| maybe_get_sysroot_from_sdkroot () |
| { |
| const char *maybe_sysroot = getenv ("SDKROOT"); |
| |
| /* We'll use the same rules as the clang driver, for compatibility. |
| 1) The path must be absolute |
| 2) Ignore "/", that is the default anyway and we do not want the |
| sysroot semantics to be applied to it. |
| 3) It must exist (actually, we'll check it's readable too). */ |
| |
| if (maybe_sysroot == NULL |
| || *maybe_sysroot != '/' |
| || strlen (maybe_sysroot) == 1 |
| || access (maybe_sysroot, R_OK) == -1) |
| return NULL; |
| |
| return xstrndup (maybe_sysroot, strlen (maybe_sysroot)); |
| } |
| |
| /* Handle the deduction of m32/m64 from -arch flags and the interactions |
| between them (i.e. try to warn a user who thinks that they have a driver |
| that can produce multi-slice "FAT" outputs with more than one arch). |
| Default the -mmacosx-version-min flag, which requires a system call on |
| native hosts. */ |
| |
| void |
| darwin_driver_init (unsigned int *decoded_options_count, |
| struct cl_decoded_option **decoded_options) |
| { |
| unsigned int i; |
| bool seenX86 = false; |
| bool seenX86_64 = false; |
| bool seenPPC = false; |
| bool seenPPC64 = false; |
| bool seenM32 = false; |
| bool seenM64 = false; |
| bool appendM32 = false; |
| bool appendM64 = false; |
| const char *vers_string = NULL; |
| bool seen_version_min = false; |
| bool seen_sysroot_p = false; |
| bool noexport_p = true; |
| |
| for (i = 1; i < *decoded_options_count; i++) |
| { |
| if ((*decoded_options)[i].errors & CL_ERR_MISSING_ARG) |
| continue; |
| |
| switch ((*decoded_options)[i].opt_index) |
| { |
| case OPT_arch: |
| /* Support provision of a single -arch xxxx flag as a means of |
| specifying the sub-target/multi-lib. Translate this into -m32/64 |
| as appropriate. */ |
| if (!strcmp ((*decoded_options)[i].arg, "i386")) |
| seenX86 = true; |
| else if (!strcmp ((*decoded_options)[i].arg, "x86_64")) |
| seenX86_64 = true; |
| else if (!strcmp ((*decoded_options)[i].arg, "ppc")) |
| seenPPC = true; |
| else if (!strcmp ((*decoded_options)[i].arg, "ppc64")) |
| seenPPC64 = true; |
| else |
| error ("this compiler does not support %s", |
| (*decoded_options)[i].arg); |
| /* Now we've examined it, drop the -arch arg. */ |
| if (*decoded_options_count > i) { |
| memmove (*decoded_options + i, |
| *decoded_options + i + 1, |
| ((*decoded_options_count - i - 1) |
| * sizeof (struct cl_decoded_option))); |
| } |
| --i; |
| --*decoded_options_count; |
| break; |
| |
| case OPT_m32: |
| seenM32 = true; |
| break; |
| |
| case OPT_m64: |
| seenM64 = true; |
| break; |
| |
| case OPT_mmacosx_version_min_: |
| seen_version_min = true; |
| vers_string = |
| validate_macosx_version_min ((*decoded_options)[i].arg); |
| if (vers_string == NULL) |
| warning (0, "%qs is not valid for %<mmacosx-version-min%>", |
| (*decoded_options)[i].arg); |
| else if (vers_string == (*decoded_options)[i].arg) |
| vers_string = xstrndup ((*decoded_options)[i].arg, 32); |
| /* Now we've examined it, and verified/re-written, put it to |
| one side and append later. */ |
| if (*decoded_options_count > i) { |
| memmove (*decoded_options + i, |
| *decoded_options + i + 1, |
| ((*decoded_options_count - i - 1) |
| * sizeof (struct cl_decoded_option))); |
| } |
| --i; |
| --*decoded_options_count; |
| break; |
| |
| case OPT__sysroot_: |
| case OPT_isysroot: |
| seen_sysroot_p = true; |
| break; |
| |
| case OPT_Xlinker: |
| case OPT_Wl_: |
| gcc_checking_assert ((*decoded_options)[i].arg); |
| if (strncmp ((*decoded_options)[i].arg, "-exported_symbol", 16) == 0) |
| noexport_p = false; |
| break; |
| |
| default: |
| break; |
| } |
| } |
| |
| /* Turn -arch xxxx into the appropriate -m32/-m64 flag. |
| If the User tried to specify multiple arch flags (which is possible with |
| some Darwin compilers) warn that this mode is not supported by this |
| compiler (and ignore the arch flags, which means that the default multi- |
| lib will be generated). */ |
| /* TODO: determine if these warnings would better be errors. */ |
| #if DARWIN_X86 |
| if (seenPPC || seenPPC64) |
| warning (0, "this compiler does not support PowerPC (arch flags ignored)"); |
| if (seenX86) |
| { |
| if (seenX86_64 || seenM64) |
| warning (0, "%s conflicts with i386 (arch flags ignored)", |
| (seenX86_64? "x86_64": "m64")); |
| else if (! seenM32) /* Add -m32 if the User didn't. */ |
| appendM32 = true; |
| } |
| else if (seenX86_64) |
| { |
| if (seenX86 || seenM32) |
| warning (0, "%s conflicts with x86_64 (arch flags ignored)", |
| (seenX86? "i386": "m32")); |
| else if (! seenM64) /* Add -m64 if the User didn't. */ |
| appendM64 = true; |
| } |
| #elif DARWIN_PPC |
| if (seenX86 || seenX86_64) |
| warning (0, "this compiler does not support X86 (arch flags ignored)"); |
| if (seenPPC) |
| { |
| if (seenPPC64 || seenM64) |
| warning (0, "%s conflicts with ppc (arch flags ignored)", |
| (seenPPC64? "ppc64": "m64")); |
| else if (! seenM32) /* Add -m32 if the User didn't. */ |
| appendM32 = true; |
| } |
| else if (seenPPC64) |
| { |
| if (seenPPC || seenM32) |
| warning (0, "%s conflicts with ppc64 (arch flags ignored)", |
| (seenPPC? "ppc": "m32")); |
| else if (! seenM64) /* Add -m64 if the User didn't. */ |
| appendM64 = true; |
| } |
| #endif |
| |
| /* If there is nothing else on the command line, do not add sysroot etc. */ |
| if (*decoded_options_count <= 1) |
| return; |
| |
| if (appendM32 || appendM64) |
| { |
| ++*decoded_options_count; |
| *decoded_options = XRESIZEVEC (struct cl_decoded_option, |
| *decoded_options, |
| *decoded_options_count); |
| generate_option (appendM32 ? OPT_m32 : OPT_m64, NULL, 1, CL_DRIVER, |
| &(*decoded_options)[*decoded_options_count - 1]); |
| } |
| |
| if (!seen_sysroot_p) |
| { |
| /* We will pick up an SDKROOT if we didn't specify a sysroot and treat |
| it as overriding any configure-time --with-sysroot. */ |
| const char *sdkroot = maybe_get_sysroot_from_sdkroot (); |
| if (sdkroot) |
| { |
| ++*decoded_options_count; |
| *decoded_options = XRESIZEVEC (struct cl_decoded_option, |
| *decoded_options, |
| *decoded_options_count); |
| generate_option (OPT__sysroot_, sdkroot, 1, CL_DRIVER, |
| &(*decoded_options)[*decoded_options_count - 1]); |
| } |
| } |
| |
| /* We will need to know the OS X version we're trying to build for here |
| so that we can figure out the mechanism and source for the sysroot to |
| be used. */ |
| if (!seen_version_min) |
| /* Not set by the User, try to figure it out. */ |
| vers_string = darwin_default_min_version (); |
| |
| /* Create and push a cleaned up version, plus the major version for |
| assemblers and other cases that need it. */ |
| if (vers_string != NULL) |
| { |
| ++*decoded_options_count; |
| *decoded_options = XRESIZEVEC (struct cl_decoded_option, |
| *decoded_options, |
| *decoded_options_count); |
| generate_option (OPT_mmacosx_version_min_, vers_string, 1, CL_DRIVER, |
| &(*decoded_options)[*decoded_options_count - 1]); |
| |
| char *asm_major = NULL; |
| const char *first_period = strchr(vers_string, '.'); |
| if (first_period != NULL) |
| { |
| const char *second_period = strchr(first_period+1, '.'); |
| if (second_period != NULL) |
| asm_major = xstrndup (vers_string, second_period-vers_string); |
| else |
| asm_major = xstrdup (vers_string); |
| } |
| /* Else we appear to have a weird macosx version with no major number. |
| Punt on this for now. */ |
| if (asm_major != NULL) |
| { |
| ++*decoded_options_count; |
| *decoded_options = XRESIZEVEC (struct cl_decoded_option, |
| *decoded_options, |
| *decoded_options_count); |
| generate_option (OPT_asm_macosx_version_min_, asm_major, 1, CL_DRIVER, |
| &(*decoded_options)[*decoded_options_count - 1]); |
| } |
| } |
| |
| if (noexport_p) |
| { |
| ++*decoded_options_count; |
| *decoded_options = XRESIZEVEC (struct cl_decoded_option, |
| *decoded_options, |
| *decoded_options_count); |
| generate_option (OPT_nodefaultexport, NULL, 1, CL_DRIVER, |
| &(*decoded_options)[*decoded_options_count - 1]); |
| } |
| } |