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[MinGW] Implement the --[no-]gc-sections and --icf options 

GNU ld doesn't seem to support --icf at all, but this was suggested
in D39885, and GNU gold seems to support it.

Differential Revision: https://reviews.llvm.org/D40019

llvm-svn: 318283
This commit is contained in:
Martin Storsjo 2017-11-15 08:18:20 +00:00
parent e916868269
commit b190fd2bb4
3 changed files with 39 additions and 0 deletions
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17
lld/MinGW/Driver.cpp
View File

@ -161,6 +161,23 @@ bool mingw::link(ArrayRef<const char *> ArgsArr, raw_ostream &Diag) {
Add(Args.hasArg(OPT_dynamicbase) ? "-dynamicbase" : "-dynamicbase:no");
if (Args.hasFlag(OPT_gc_sections, OPT_no_gc_sections, false))
Add("-opt:ref");
else
Add("-opt:noref");
if (auto *A = Args.getLastArg(OPT_icf)) {
StringRef S = A->getValue();
if (S == "all")
Add("-opt:icf");
else if (S == "safe" || S == "none")
Add("-opt:noicf");
else
error("unknown parameter: --icf=" + S);
} else {
Add("-opt:noicf");
}
if (auto *A = Args.getLastArg(OPT_m)) {
StringRef S = A->getValue();
if (S == "i386pe")

3
lld/MinGW/Options.td
View File

@ -11,6 +11,8 @@ def entry: S<"entry">, MetaVarName<"<entry>">,
HelpText<"Name of entry point symbol">;
def export_all_symbols: F<"export-all-symbols">,
HelpText<"Export all symbols even if a def file or dllexport attributes are used">;
def gc_sections: F<"gc-sections">, HelpText<"Remove unused sections">;
def icf: J<"icf=">, HelpText<"Identical code folding">;
def image_base: S<"image-base">, HelpText<"Base address of the program">;
def l: JoinedOrSeparate<["-"], "l">, MetaVarName<"<libName>">,
HelpText<"Root name of library to use">;
@ -19,6 +21,7 @@ def no_whole_archive: F<"no-whole-archive">,
HelpText<"No longer include all object files for following archives">;
def large_address_aware: Flag<["--"], "large-address-aware">,
HelpText<"Enable large addresses">;
def no_gc_sections: F<"no-gc-sections">, HelpText<"Don't remove unused sections">;
def o: JoinedOrSeparate<["-"], "o">, MetaVarName<"<path>">,
HelpText<"Path to file to write output">;
def out_implib: Separate<["--"], "out-implib">, HelpText<"Import library name">;

19
lld/test/MinGW/driver.test
View File

@ -105,3 +105,22 @@ DYNAMICBASE: -dynamicbase -
RUN: ld.lld -### -m i386pep foo.o --image-base 0x1230000 | FileCheck -check-prefix IMAGE-BASE %s
RUN: ld.lld -### -m i386pep foo.o -image-base 0x1230000 | FileCheck -check-prefix IMAGE-BASE %s
IMAGE-BASE: -base:0x1230000
RUN: ld.lld -### -m i386pep foo.o | FileCheck -check-prefix NO-GC-SECTIONS %s
RUN: ld.lld -### -m i386pep foo.o --gc-sections --no-gc-sections | FileCheck -check-prefix NO-GC-SECTIONS %s
NO-GC-SECTIONS: -opt:noref
RUN: ld.lld -### -m i386pep foo.o --gc-sections | FileCheck -check-prefix GC-SECTIONS %s
RUN: ld.lld -### -m i386pep foo.o -gc-sections | FileCheck -check-prefix GC-SECTIONS %s
GC-SECTIONS: -opt:ref
RUN: ld.lld -### -m i386pep foo.o | FileCheck -check-prefix ICF-NONE %s
RUN: ld.lld -### -m i386pep foo.o --icf=none | FileCheck -check-prefix ICF-NONE %s
RUN: ld.lld -### -m i386pep foo.o -icf=none | FileCheck -check-prefix ICF-NONE %s
RUN: ld.lld -### -m i386pep foo.o --icf=safe | FileCheck -check-prefix ICF-NONE %s
RUN: ld.lld -### -m i386pep foo.o -icf=safe | FileCheck -check-prefix ICF-NONE %s
ICF-NONE: -opt:noicf
RUN: ld.lld -### -m i386pep foo.o --icf=all | FileCheck -check-prefix ICF %s
RUN: ld.lld -### -m i386pep foo.o -icf=all | FileCheck -check-prefix ICF %s
ICF: -opt:icf