[lld][MinGW] Introduce aliases for -Bdynamic and -Bstatic

[zero9178]

Summary

Besides -Bdynamic and -Bstatic, ld documents additional aliases for both of these options. Instead of -Bstatic, one may write -dn, -non_shared or -static. Instead of -Bdynamic one may write -dy or -call_shared. Source: https://sourceware.org/binutils/docs-2.36/ld/Options.html

This patch adds those aliases to the MinGW driver of lld for the sake of ld compatibility.

Encountered this case while compiling a static Qt 6.1 distribution and got build failures as -static was passed directly to the linker, instead of through the compiler driver.

[mstorsjo]

LGTM

Interesting, I wasn't aware of the others, other than -static.

Is this use of -static (which I'd presume is in the form of -Wl,-static) somewhere in the Qt source/build system itself (which would surprise me as I build Qt quite a lot, but I haven't tested building 6.x with cmake statically), or in a third party build script?

lld/MinGW/Options.td

125

Nit: I try to keep these alphabetical, especially as long as the existing ones are. And also, keep spaces after commas.

[zero9178]

In D102637#2764385, @mstorsjo wrote:

LGTM

Interesting, I wasn't aware of the others, other than -static.

Is this use of -static (which I'd presume is in the form of -Wl,-static) somewhere in the Qt source/build system itself (which would surprise me as I build Qt quite a lot, but I haven't tested building 6.x with cmake statically), or in a third party build script?

I only first encountered it when compiling Qt 6.1 as well (I haven't checked Qt 6.0, assuming it's there too). The command is actually of the form -Xlinker -static. I just quickly ran a grep of it over the output of ninja -t commands and as far as I can tell it's added for every executable built by Qt.
Their build passes it directly to the linker here: https://github.com/qt/qtbase/blob/a4618c020d3923eb6c8c55115c49d7c9f00b3034/cmake/QtTargetHelpers.cmake#L196

lld/MinGW/Options.td

125

Ahh that makes sense. I shall commit with:

// Alias
+def alias_Bdynamic_call_shared: Flag<["-"], "call_shared">, Alias<Bdynamic>;
+def alias_Bdynamic_dy: Flag<["-"], "dy">, Alias<Bdynamic>;
+def alias_Bstatic_dn: Flag<["-"], "dn">, Alias<Bstatic>;
+def alias_Bstatic_non_shared: Flag<["-"], "non_shared">, Alias<Bstatic>;
+def alias_Bstatic_static: Flag<["-"], "static">, Alias<Bstatic>;
 def alias_entry_e: JoinedOrSeparate<["-"], "e">, Alias<entry>;
 def alias_strip_s: Flag<["-"], "s">, Alias<strip_all>;
 def alias_strip_S: Flag<["-"], "S">, Alias<strip_debug>;
 def alias_undefined_u: JoinedOrSeparate<["-"], "u">, Alias<undefined>;

then.

[mstorsjo]

In D102637#2764424, @zero9178 wrote:

I only first encountered it when compiling Qt 6.1 as well (I haven't checked Qt 6.0, assuming it's there too). The command is actually of the form -Xlinker -static. I just quickly ran a grep of it over the output of ninja -t commands and as far as I can tell it's added for every executable built by Qt.
Their build passes it directly to the linker here: https://github.com/qt/qtbase/blob/a4618c020d3923eb6c8c55115c49d7c9f00b3034/cmake/QtTargetHelpers.cmake#L196

Ah, thanks! Ok so apparently that would hit everybody building it statically with the new cmake build system.

lld/MinGW/Options.td

125

That looks good, thanks!

lld/MinGW/Options.td

 def mllvm: S<"mllvm">;
 defm pdb: Eq<"pdb", "Output PDB debug info file, chosen implicitly if the argument is empty">;
 defm thinlto_cache_dir: EqLong<"thinlto-cache-dir",
   "Path to ThinLTO cached object file directory">;
 def Xlink : J<"Xlink=">, MetaVarName<"<arg>">,
     HelpText<"Pass <arg> to the COFF linker">;
 
 // Alias
+def alias_Bdynamic_call_shared: Flag<["-"], "call_shared">, Alias<Bdynamic>;
+def alias_Bdynamic_dy: Flag<["-"], "dy">, Alias<Bdynamic>;
+def alias_Bstatic_dn: Flag<["-"], "dn">, Alias<Bstatic>;
+def alias_Bstatic_non_shared: Flag<["-"], "non_shared">, Alias<Bstatic>;
+def alias_Bstatic_static: Flag<["-"], "static">, Alias<Bstatic>;
 def alias_entry_e: JoinedOrSeparate<["-"], "e">, Alias<entry>;
 def alias_strip_s: Flag<["-"], "s">, Alias<strip_all>;
 def alias_strip_S: Flag<["-"], "S">, Alias<strip_debug>;
 def alias_undefined_u: JoinedOrSeparate<["-"], "u">, Alias<undefined>;
 
 // Ignored options
 def: Joined<["-"], "O">;
 def: F<"build-id">;
 def: F<"disable-auto-image-base">;
 def: F<"enable-auto-image-base">;
 def: F<"end-group">;
 def: Flag<["--"], "full-shutdown">;
 def: F<"high-entropy-va">;

lld/test/MinGW/lib.test

 RUN: not ld.lld -### -m i386pep -l:barefilename -L%t/lib 2>&1 | FileCheck -check-prefix=LIB-LITERAL-FAIL %s
 LIB-LITERAL-FAIL: unable to find library -l:barefilename
 
 RUN: echo > %t/lib/barefilename
 RUN: ld.lld -### -m i386pep -l:barefilename -L%t/lib 2>&1 | FileCheck -check-prefix=LIB-LITERAL %s
 LIB-LITERAL: barefilename
 
 RUN: not ld.lld -### -m i386pep -Bstatic -lfoo -L%t/lib 2>&1 | FileCheck -check-prefix=LIB3 %s
+RUN: not ld.lld -### -m i386pep -dn -lfoo -L%t/lib 2>&1 | FileCheck -check-prefix=LIB3 %s
+RUN: not ld.lld -### -m i386pep -static -lfoo -L%t/lib 2>&1 | FileCheck -check-prefix=LIB3 %s
+RUN: not ld.lld -### -m i386pep -non_shared -lfoo -L%t/lib 2>&1 | FileCheck -check-prefix=LIB3 %s
 LIB3: unable to find library -lfoo
 
 RUN: echo > %t/lib/libfoo.a
 RUN: ld.lld -### -m i386pep -Bstatic -lfoo -L%t/lib | FileCheck -check-prefix=LIB4 %s
 LIB4: libfoo.a
 
 RUN: echo > %t/lib/libbar.dll.a
 RUN: echo > %t/lib/libbar.a
 RUN: ld.lld -### -m i386pep -Bstatic -lfoo -Bdynamic -lbar -L%t/lib | FileCheck -check-prefix=LIB5 %s
+RUN: ld.lld -### -m i386pep -Bstatic -lfoo -dy -lbar -L%t/lib | FileCheck -check-prefix=LIB5 %s
+RUN: ld.lld -### -m i386pep -Bstatic -lfoo -call_shared -lbar -L%t/lib | FileCheck -check-prefix=LIB5 %s
 LIB5:      libfoo.a
 LIB5-SAME: libbar.dll.a
 
 RUN: echo > %t/lib/noprefix.dll.a
 RUN: echo > %t/lib/msvcstyle.lib
 RUN: ld.lld -### -m i386pep -L%t/lib -lnoprefix -lmsvcstyle | FileCheck -check-prefix=OTHERSTYLES %s
 OTHERSTYLES: noprefix.dll.a
 OTHERSTYLES-SAME: msvcstyle.lib
 
 RUN: echo > %t/lib/libnoimplib.dll
 RUN: echo > %t/lib/noprefix_noimplib.dll
 RUN: not ld.lld -### -m i386pep -L%t/lib -lnoimplib 2>&1 | FileCheck -check-prefix=UNSUPPORTED-DLL1 %s
 RUN: not ld.lld -### -m i386pep -L%t/lib -lnoprefix_noimplib 2>&1 | FileCheck -check-prefix=UNSUPPORTED-DLL2 %s
 UNSUPPORTED-DLL1: lld doesn't support linking directly against {{.*}}libnoimplib.dll, use an import library
 UNSUPPORTED-DLL2: lld doesn't support linking directly against {{.*}}noprefix_noimplib.dll, use an import library