If linking directly against a DLL without an import library, the
DLL export symbols might not contain stdcall decorations.
If we have an undefined symbol with decoration, and we happen to have
a matching undecorated symbol (which either is lazy and can be loaded,
or already defined), then alias it against that instead.
This matches what's done in reverse, when we have a def file
declaring to export a symbol without decoration, but we only have
a defined decorated symbol. In that case we do a fuzzy match
(SymbolTable::findMangle). This case is more straightforward; if we
have a decorated undefined symbol, just strip the decoration and look
for the corresponding undecorated symbol name.
Add warnings and options for either silencing the warning or disabling
the whole feature, corresponding to how ld.bfd does it.
(This feature works for any symbol decoration mismatch, not only when
linking against a DLL directly; ld.bfd also tolerates it anywhere,
and also fixes up mismatches in the other direction, like
SymbolTable::findMangle, for any symbol, not only exports. But in
practice, at least for lld, it would primarily end up used for linking
against DLLs.)
Differential Revision: https://reviews.llvm.org/D104532
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.
Differential Revision: https://reviews.llvm.org/D102637
Add a simple forwarding option in the MinGW frontend, and implement
the private -wrap option in the COFF linker.
The feature in lld-link isn't gated by the -lldmingw option, but
the option is left as a private, undocumented option primarily
used by the MinGW driver.
The implementation is significantly based on the support for --wrap
in the ELF linker, but many small nuance details are different
between the ELF and COFF linkers, ending up with more than a few
implementation differences.
This fixes https://bugs.llvm.org/show_bug.cgi?id=47384.
Differential Revision: https://reviews.llvm.org/D89004
Reapplied with the bitfield member canInline fixed so it doesn't break
builds targeting windows.
This reverts commit a012c704b5.
Breaks Windows builds.
C:\src\llvm-mint\lld\COFF\Symbols.cpp(26,1): error: static_assert failed due to requirement 'sizeof(lld::coff::SymbolUnion) <= 48' "symbols should be optimized for memory usage"
static_assert(sizeof(SymbolUnion) <= 48,
Add a simple forwarding option in the MinGW frontend, and implement
the private -wrap option in the COFF linker.
The feature in lld-link isn't gated by the -lldmingw option, but
the option is left as a private, undocumented option primarily
used by the MinGW driver.
The implementation is significantly based on the support for --wrap
in the ELF linker, but many small nuance details are different
between the ELF and COFF linkers, ending up with more than a few
implementation differences.
This fixes https://bugs.llvm.org/show_bug.cgi?id=47384.
Differential Revision: https://reviews.llvm.org/D89004
This matches lld-link's own default.
Add a new command line option --no-dynamicbase for disabling it.
(Unfortunately, GNU ld doesn't yet have a matching --no-dynamicbase
option, as that's the default there.)
Differential Revision: https://reviews.llvm.org/D86654
Previously this flag was just ignored. If set, set the
IMAGE_DLL_CHARACTERISTICS_NO_SEH bit, regardless of the normal safeSEH
machinery.
In mingw configurations, the safeSEH bit might not be set in e.g. object
files built from handwritten assembly, making it impossible to use the
normal safeseh flag. As mingw setups don't generally use SEH on 32 bit
x86 at all, it should be fine to set that flag bit though - hook up
the existing GNU ld flag for controlling that.
Differential Revision: https://reviews.llvm.org/D84701
Allow disabling either the full auto import feature, or just
forbidding the cases that require runtime fixups.
As long as all auto imported variables are referenced from separate
.refptr$<name> sections, we can alias them on top of the IAT entries
and don't actually need any runtime fixups via pseudo relocations.
LLVM generates references to variables in .refptr stubs, if it
isn't known that the variable for sure is defined in the same object
module. Runtime pseudo relocs are needed if the addresses of auto
imported variables are used in constant initializers though.
Fixing up runtime pseudo relocations requires the use of
VirtualProtect (which is disallowed in WinStore/UWP apps) or
VirtualProtectFromApp. To allow any risk of ambiguity, allow
rejecting cases that would require this at the linker stage.
This adds support for the --disable-runtime-pseudo-reloc and
--disable-auto-import options in the MinGW driver (matching GNU ld.bfd)
with corresponding lld private options in the COFF driver.
Differential Revision: https://reviews.llvm.org/D78923
Support the equals form of the long --entry=<symbol> option,
add a test for the -e<symbol> form.
Add tests for single dash forms of -exclude-all-symbols and
-export-all-symbols.
Support single-dash forms of -out-implib and -output-def, support
the equals form of --output-def=<file>. (We previously had a test
to explicitly disallow -out-implib, but it turns out that GNU ld
actually does support it just fine, despite also matching the
-o<file> option.)
Disallow the double-dashed --u form, add a test for -u<symbol>.
Differential Revision: https://reviews.llvm.org/D66066
llvm-svn: 368816
With GNU tools, delayload is handled completely differently. (One
creates a specific delayload import library using dlltool and then
links against it instead of the normal import library.)
Instead of requiring using -Xlink=-delayload:lib.dll, we can provide
an lld specific option for this.
Differential Revision: https://reviews.llvm.org/D65728
llvm-svn: 367837
This is implemented by the lld-link option -include:, just like
--require-defined. Contrary to --require-defined, the -u/--undefined
option allows the symbol to remain undefined in the end.
This should fix PR42121.
Differential Revision: https://reviews.llvm.org/D62876
llvm-svn: 362882
Libtool concludes that the linker doesn't support shared libraries,
unless this flag is listed in the output of --help.
Differential Revision: https://reviews.llvm.org/D62053
llvm-svn: 361017
When integrating PDB output in mingw targeting build systems, it
might be a lot of extra work to specify unique file names for
the pdb output. Therefore allow omitting the actual file name
and let it implicitly be the same name as the linker output, with
a pdb extension.
As the current form of the pdb option takes a separate parameter value,
e.g. "-pdb out.pdb", it is impractical to leave out the parameter value.
Therefore, introduce a second syntax for the option, with an equals
sign, like -pdb=out.pdb, where the value easily can be omitted.
The form -pdb= for requesting pdb files with an implicit name should
work fine, even though it looks a bit unconventional in that form.
Differential Revision: https://reviews.llvm.org/D62004
llvm-svn: 361014
Move them to the same section as the newly added ignored options
without a defined name.
Also move options that actually weren't ignored to the right section.
Differential Revision: https://reviews.llvm.org/D57374
llvm-svn: 352529
GCC can use LLD with -fuse-ld=lld for MinGW these days, but by
default these options are passed to the linker (unless -fno-lto
is passed to the GCC driver).
Differential Revision: https://reviews.llvm.org/D57304
llvm-svn: 352459
In this mode, we retain the symbol table, but skip the actual debug
information.
Differential Revision: https://reviews.llvm.org/D48745
llvm-svn: 335947
This allows producing pdb debug info. This is an LLD specific option
since GCC and GNU binutils doesn't support the PDB file format.
Differential Revision: https://reviews.llvm.org/D46796
llvm-svn: 332327
These are required for handling circular dependencies between
static libraries, which is something that lld-link always does without
any extra parameters.
Differential Revision: https://reviews.llvm.org/D43786
llvm-svn: 326172
The COFF linker automatically sets the IMAGE_DLL_CHARACTERISTICS_NO_SEH
when suitable, similarly to link.exe.
Differential Revision: https://reviews.llvm.org/D41275
llvm-svn: 320861
LLD already writes a build id if debug info is enabled.
Some projects set --pie-executable to avoid GNU ld bugs about stripping
base relocations from an executable when they actually are used.
Since -fixed:no is the default (and we don't support setting the
-fixed option via the MinGW frontend), we don't need to handle this.
--disable-auto-image-base is ignored just like --enable-auto-image-base
(as we ignore from before).
Differential Revision: https://reviews.llvm.org/D40031
llvm-svn: 318285
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
All of these are disabled by default in GNU ld, but enabled by default
in lld.
Disable dynamicbase by default since it potentially could cause
compatibility issues, but just ignore the others since the lld
default should be fine for most concievable cases.
Differential Revision: https://reviews.llvm.org/D40017
llvm-svn: 318281
In GNU ld, this option is only available on i386, not on x86_64
(where it's enabled by default with no option to disable it either).
Differential Revision: https://reviews.llvm.org/D40015
llvm-svn: 318280
In GNU ld, this option is enabled by default, but can be set
to reduce some warnings.
For lld, ignore the flag (for now); in case linking still succeeds
everything should be fine, if not, it should be clear to the user
what part failed (possibly requiring adjusting the user project
to not rely on this feature), instead of straight out failing due to
an unknown flag.
Differential Revision: https://reviews.llvm.org/D39330
llvm-svn: 316693
Martin Storsjö