[lld] 46a3268 - [WebAssembly] Add warnings for -shared and -pie
Dan Gohman via llvm-commits
llvm-commits at lists.llvm.org
Thu Jun 25 15:59:22 PDT 2020
Author: Dan Gohman
Date: 2020-06-25T15:55:46-07:00
New Revision: 46a32683123a05b58302f10dc4c270519c80115a
URL: https://github.com/llvm/llvm-project/commit/46a32683123a05b58302f10dc4c270519c80115a
DIFF: https://github.com/llvm/llvm-project/commit/46a32683123a05b58302f10dc4c270519c80115a.diff
LOG: [WebAssembly] Add warnings for -shared and -pie
The meaning of -shared and -pie are expected to be changed in the
future when Module Linking-style libraries are implemented. Begin
issuing warnings to give people a heads-up that they will be changing.
For compatibility with Emscripten, add a --experimental-pic flag which
disables these warnings.
Differential Revision: https://reviews.llvm.org/D81760
Added:
Modified:
lld/wasm/Config.h
lld/wasm/Driver.cpp
lld/wasm/Options.td
Removed:
################################################################################
diff --git a/lld/wasm/Config.h b/lld/wasm/Config.h
index 4a1f7a69d079..cae2852baf86 100644
--- a/lld/wasm/Config.h
+++ b/lld/wasm/Config.h
@@ -27,6 +27,7 @@ struct Configuration {
bool compressRelocations;
bool demangle;
bool disableVerify;
+ bool experimentalPic;
bool emitRelocs;
bool exportAll;
bool exportDynamic;
diff --git a/lld/wasm/Driver.cpp b/lld/wasm/Driver.cpp
index 636aa6509b25..d0805bf3b303 100644
--- a/lld/wasm/Driver.cpp
+++ b/lld/wasm/Driver.cpp
@@ -332,6 +332,7 @@ static void readConfigs(opt::InputArgList &args) {
config->demangle = args.hasFlag(OPT_demangle, OPT_no_demangle, true);
config->disableVerify = args.hasArg(OPT_disable_verify);
config->emitRelocs = args.hasArg(OPT_emit_relocs);
+ config->experimentalPic = args.hasArg(OPT_experimental_pic);
config->entry = getEntry(args);
config->exportAll = args.hasArg(OPT_export_all);
config->exportTable = args.hasArg(OPT_export_table);
@@ -468,6 +469,23 @@ static void checkOptions(opt::InputArgList &args) {
if (config->sharedMemory)
error("-r and --shared-memory may not be used together");
}
+
+ // To begin to prepare for Module Linking-style shared libraries, start
+ // warning about uses of `-shared` and related flags outside of Experimental
+ // mode, to give anyone using them a heads-up that they will be changing.
+ //
+ // Also, warn about flags which request explicit exports.
+ if (!config->experimentalPic) {
+ // -shared will change meaning when Module Linking is implemented.
+ if (config->shared) {
+ warn("creating shared libraries, with -shared, is not yet stable");
+ }
+
+ // -pie will change meaning when Module Linking is implemented.
+ if (config->pie) {
+ warn("creating PIEs, with -pie, is not yet stable");
+ }
+ }
}
// Force Sym to be entered in the output. Used for -u or equivalent.
diff --git a/lld/wasm/Options.td b/lld/wasm/Options.td
index 241050922ea8..16c784f74828 100644
--- a/lld/wasm/Options.td
+++ b/lld/wasm/Options.td
@@ -200,3 +200,7 @@ def thinlto_cache_dir: J<"thinlto-cache-dir=">,
defm thinlto_cache_policy: Eq<"thinlto-cache-policy", "Pruning policy for the ThinLTO cache">;
def thinlto_jobs: J<"thinlto-jobs=">,
HelpText<"Number of ThinLTO jobs. Default to --threads=">;
+
+// Experimental PIC mode.
+def experimental_pic: F<"experimental-pic">,
+ HelpText<"Enable Experimental PIC">;
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