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30 package work
31
32 import (
33 "fmt"
34 "internal/lazyregexp"
35 "regexp"
36 "strings"
37
38 "cmd/go/internal/cfg"
39 "cmd/go/internal/load"
40 )
41
42 var re = lazyregexp.New
43
44 var validCompilerFlags = []*lazyregexp.Regexp{
45 re(`-D([A-Za-z_][A-Za-z0-9_]*)(=[^@\-]*)?`),
46 re(`-U([A-Za-z_][A-Za-z0-9_]*)`),
47 re(`-F([^@\-].*)`),
48 re(`-I([^@\-].*)`),
49 re(`-O`),
50 re(`-O([^@\-].*)`),
51 re(`-W`),
52 re(`-W([^@,]+)`),
53 re(`-Wa,-mbig-obj`),
54 re(`-Wp,-D([A-Za-z_][A-Za-z0-9_]*)(=[^@,\-]*)?`),
55 re(`-Wp,-U([A-Za-z_][A-Za-z0-9_]*)`),
56 re(`-ansi`),
57 re(`-f(no-)?asynchronous-unwind-tables`),
58 re(`-f(no-)?blocks`),
59 re(`-f(no-)builtin-[a-zA-Z0-9_]*`),
60 re(`-f(no-)?common`),
61 re(`-f(no-)?constant-cfstrings`),
62 re(`-fdebug-prefix-map=([^@]+)=([^@]+)`),
63 re(`-fdiagnostics-show-note-include-stack`),
64 re(`-ffile-prefix-map=([^@]+)=([^@]+)`),
65 re(`-fno-canonical-system-headers`),
66 re(`-f(no-)?eliminate-unused-debug-types`),
67 re(`-f(no-)?exceptions`),
68 re(`-f(no-)?fast-math`),
69 re(`-f(no-)?inline-functions`),
70 re(`-finput-charset=([^@\-].*)`),
71 re(`-f(no-)?fat-lto-objects`),
72 re(`-f(no-)?keep-inline-dllexport`),
73 re(`-f(no-)?lto`),
74 re(`-fmacro-backtrace-limit=(.+)`),
75 re(`-fmessage-length=(.+)`),
76 re(`-f(no-)?modules`),
77 re(`-f(no-)?objc-arc`),
78 re(`-f(no-)?objc-nonfragile-abi`),
79 re(`-f(no-)?objc-legacy-dispatch`),
80 re(`-f(no-)?omit-frame-pointer`),
81 re(`-f(no-)?openmp(-simd)?`),
82 re(`-f(no-)?permissive`),
83 re(`-f(no-)?(pic|PIC|pie|PIE)`),
84 re(`-f(no-)?plt`),
85 re(`-f(no-)?rtti`),
86 re(`-f(no-)?split-stack`),
87 re(`-f(no-)?stack-(.+)`),
88 re(`-f(no-)?strict-aliasing`),
89 re(`-f(un)signed-char`),
90 re(`-f(no-)?use-linker-plugin`),
91 re(`-f(no-)?visibility-inlines-hidden`),
92 re(`-fsanitize=(.+)`),
93 re(`-ftemplate-depth-(.+)`),
94 re(`-fvisibility=(.+)`),
95 re(`-g([^@\-].*)?`),
96 re(`-m32`),
97 re(`-m64`),
98 re(`-m(abi|arch|cpu|fpu|tune)=([^@\-].*)`),
99 re(`-m(no-)?v?aes`),
100 re(`-marm`),
101 re(`-m(no-)?avx[0-9a-z]*`),
102 re(`-mfloat-abi=([^@\-].*)`),
103 re(`-mfpmath=[0-9a-z,+]*`),
104 re(`-m(no-)?avx[0-9a-z.]*`),
105 re(`-m(no-)?ms-bitfields`),
106 re(`-m(no-)?stack-(.+)`),
107 re(`-mmacosx-(.+)`),
108 re(`-mios-simulator-version-min=(.+)`),
109 re(`-miphoneos-version-min=(.+)`),
110 re(`-mtvos-simulator-version-min=(.+)`),
111 re(`-mtvos-version-min=(.+)`),
112 re(`-mwatchos-simulator-version-min=(.+)`),
113 re(`-mwatchos-version-min=(.+)`),
114 re(`-mnop-fun-dllimport`),
115 re(`-m(no-)?sse[0-9.]*`),
116 re(`-m(no-)?ssse3`),
117 re(`-mthumb(-interwork)?`),
118 re(`-mthreads`),
119 re(`-mwindows`),
120 re(`-no-canonical-prefixes`),
121 re(`--param=ssp-buffer-size=[0-9]*`),
122 re(`-pedantic(-errors)?`),
123 re(`-pipe`),
124 re(`-pthread`),
125 re(`-?-std=([^@\-].*)`),
126 re(`-?-stdlib=([^@\-].*)`),
127 re(`--sysroot=([^@\-].*)`),
128 re(`-w`),
129 re(`-x([^@\-].*)`),
130 re(`-v`),
131 }
132
133 var validCompilerFlagsWithNextArg = []string{
134 "-arch",
135 "-D",
136 "-U",
137 "-I",
138 "-F",
139 "-framework",
140 "-include",
141 "-isysroot",
142 "-isystem",
143 "--sysroot",
144 "-target",
145 "-x",
146 }
147
148 var validLinkerFlags = []*lazyregexp.Regexp{
149 re(`-F([^@\-].*)`),
150 re(`-l([^@\-].*)`),
151 re(`-L([^@\-].*)`),
152 re(`-O`),
153 re(`-O([^@\-].*)`),
154 re(`-f(no-)?(pic|PIC|pie|PIE)`),
155 re(`-f(no-)?openmp(-simd)?`),
156 re(`-fsanitize=([^@\-].*)`),
157 re(`-flat_namespace`),
158 re(`-g([^@\-].*)?`),
159 re(`-headerpad_max_install_names`),
160 re(`-m(abi|arch|cpu|fpu|tune)=([^@\-].*)`),
161 re(`-mfloat-abi=([^@\-].*)`),
162 re(`-mmacosx-(.+)`),
163 re(`-mios-simulator-version-min=(.+)`),
164 re(`-miphoneos-version-min=(.+)`),
165 re(`-mthreads`),
166 re(`-mwindows`),
167 re(`-(pic|PIC|pie|PIE)`),
168 re(`-pthread`),
169 re(`-rdynamic`),
170 re(`-shared`),
171 re(`-?-static([-a-z0-9+]*)`),
172 re(`-?-stdlib=([^@\-].*)`),
173 re(`-v`),
174
175
176
177
178
179
180 re(`-Wl,--(no-)?allow-multiple-definition`),
181 re(`-Wl,--(no-)?allow-shlib-undefined`),
182 re(`-Wl,--(no-)?as-needed`),
183 re(`-Wl,-Bdynamic`),
184 re(`-Wl,-berok`),
185 re(`-Wl,-Bstatic`),
186 re(`-Wl,-Bsymbolic-functions`),
187 re(`-Wl,-O[0-9]+`),
188 re(`-Wl,-d[ny]`),
189 re(`-Wl,--disable-new-dtags`),
190 re(`-Wl,-e[=,][a-zA-Z0-9]+`),
191 re(`-Wl,--enable-new-dtags`),
192 re(`-Wl,--end-group`),
193 re(`-Wl,--(no-)?export-dynamic`),
194 re(`-Wl,-E`),
195 re(`-Wl,-framework,[^,@\-][^,]+`),
196 re(`-Wl,--hash-style=(sysv|gnu|both)`),
197 re(`-Wl,-headerpad_max_install_names`),
198 re(`-Wl,--no-undefined`),
199 re(`-Wl,-R,?([^@\-,][^,@]*$)`),
200 re(`-Wl,--just-symbols[=,]([^,@\-][^,@]+)`),
201 re(`-Wl,-rpath(-link)?[=,]([^,@\-][^,]+)`),
202 re(`-Wl,-s`),
203 re(`-Wl,-search_paths_first`),
204 re(`-Wl,-sectcreate,([^,@\-][^,]+),([^,@\-][^,]+),([^,@\-][^,]+)`),
205 re(`-Wl,--start-group`),
206 re(`-Wl,-?-static`),
207 re(`-Wl,-?-subsystem,(native|windows|console|posix|xbox)`),
208 re(`-Wl,-syslibroot[=,]([^,@\-][^,]+)`),
209 re(`-Wl,-undefined[=,]([^,@\-][^,]+)`),
210 re(`-Wl,-?-unresolved-symbols=[^,]+`),
211 re(`-Wl,--(no-)?warn-([^,]+)`),
212 re(`-Wl,-?-wrap[=,][^,@\-][^,]*`),
213 re(`-Wl,-z,(no)?execstack`),
214 re(`-Wl,-z,relro`),
215
216 re(`[a-zA-Z0-9_/].*\.(a|o|obj|dll|dylib|so|tbd)`),
217 re(`\./.*\.(a|o|obj|dll|dylib|so|tbd)`),
218 }
219
220 var validLinkerFlagsWithNextArg = []string{
221 "-arch",
222 "-F",
223 "-l",
224 "-L",
225 "-framework",
226 "-isysroot",
227 "--sysroot",
228 "-target",
229 "-Wl,-framework",
230 "-Wl,-rpath",
231 "-Wl,-R",
232 "-Wl,--just-symbols",
233 "-Wl,-undefined",
234 }
235
236 func checkCompilerFlags(name, source string, list []string) error {
237 checkOverrides := true
238 return checkFlags(name, source, list, validCompilerFlags, validCompilerFlagsWithNextArg, checkOverrides)
239 }
240
241 func checkLinkerFlags(name, source string, list []string) error {
242 checkOverrides := true
243 return checkFlags(name, source, list, validLinkerFlags, validLinkerFlagsWithNextArg, checkOverrides)
244 }
245
246
247
248
249
250 func checkCompilerFlagsForInternalLink(name, source string, list []string) error {
251 checkOverrides := false
252 if err := checkFlags(name, source, list, validCompilerFlags, validCompilerFlagsWithNextArg, checkOverrides); err != nil {
253 return err
254 }
255
256
257 for _, fl := range list {
258 if strings.HasPrefix(fl, "-flto") {
259 return fmt.Errorf("flag %q triggers external linking", fl)
260 }
261 }
262 return nil
263 }
264
265 func checkFlags(name, source string, list []string, valid []*lazyregexp.Regexp, validNext []string, checkOverrides bool) error {
266
267 var (
268 allow *regexp.Regexp
269 disallow *regexp.Regexp
270 )
271 if checkOverrides {
272 if env := cfg.Getenv("CGO_" + name + "_ALLOW"); env != "" {
273 r, err := regexp.Compile(env)
274 if err != nil {
275 return fmt.Errorf("parsing $CGO_%s_ALLOW: %v", name, err)
276 }
277 allow = r
278 }
279 if env := cfg.Getenv("CGO_" + name + "_DISALLOW"); env != "" {
280 r, err := regexp.Compile(env)
281 if err != nil {
282 return fmt.Errorf("parsing $CGO_%s_DISALLOW: %v", name, err)
283 }
284 disallow = r
285 }
286 }
287
288 Args:
289 for i := 0; i < len(list); i++ {
290 arg := list[i]
291 if disallow != nil && disallow.FindString(arg) == arg {
292 goto Bad
293 }
294 if allow != nil && allow.FindString(arg) == arg {
295 continue Args
296 }
297 for _, re := range valid {
298 if re.FindString(arg) == arg {
299 continue Args
300 }
301 }
302 for _, x := range validNext {
303 if arg == x {
304 if i+1 < len(list) && load.SafeArg(list[i+1]) {
305 i++
306 continue Args
307 }
308
309
310 if i+1 < len(list) &&
311 strings.HasPrefix(arg, "-Wl,") &&
312 strings.HasPrefix(list[i+1], "-Wl,") &&
313 load.SafeArg(list[i+1][4:]) &&
314 !strings.Contains(list[i+1][4:], ",") {
315 i++
316 continue Args
317 }
318
319
320 if i+1 < len(list) && arg == "-I" {
321 if (strings.HasPrefix(list[i+1], "=") || strings.HasPrefix(list[i+1], "$SYSROOT")) &&
322 load.SafeArg(list[i+1][1:]) {
323 i++
324 continue Args
325 }
326 }
327
328 if i+1 < len(list) {
329 return fmt.Errorf("invalid flag in %s: %s %s (see https://golang.org/s/invalidflag)", source, arg, list[i+1])
330 }
331 return fmt.Errorf("invalid flag in %s: %s without argument (see https://golang.org/s/invalidflag)", source, arg)
332 }
333 }
334 Bad:
335 return fmt.Errorf("invalid flag in %s: %s", source, arg)
336 }
337 return nil
338 }
339
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