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[opt] Print deprecation warning for use of legacy syntax with new pass manager 

And a possible opt invocation plus a link to more extensive documentation.

Reviewed By: asbirlea

Differential Revision: https://reviews.llvm.org/D136617
This commit is contained in:
Arthur Eubanks 2022-10-23 13:42:13 -07:00
parent 8d41609924
commit d7816057d7
2 changed files with 19 additions and 0 deletions
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12
llvm/test/Other/opt-legacy-syntax-deprecation.ll Normal file
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@ -0,0 +1,12 @@
; REQUIRES: x86-registered-target
; RUN: opt /dev/null -disable-output 2>&1 | FileCheck %s --check-prefix=OK --allow-empty
; RUN: opt /dev/null -disable-output -passes=instcombine 2>&1 | FileCheck %s --check-prefix=OK --allow-empty
; RUN: opt /dev/null -disable-output -instcombine 2>&1 | FileCheck %s --check-prefix=WARN
; RUN: opt /dev/null -disable-output -instcombine -globaldce 2>&1 | FileCheck %s --check-prefix=WARN
; RUN: opt /dev/null -disable-output -instcombine -enable-new-pm=0 2>&1 | FileCheck %s --check-prefix=OK --allow-empty
; RUN: opt /dev/null -disable-output -codegenprepare -mtriple=x86_64-unknown-linux-gnu 2>&1 | FileCheck %s --check-prefix=OK --allow-empty
; OK-NOT: deprecated
; WARN: The `opt -passname` syntax for the new pass manager is deprecated, please use `opt -passes=<pipeline>` (or the `-p` alias for a more concise version).

7
llvm/tools/opt/opt.cpp
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@ -713,6 +713,13 @@ int main(int argc, char **argv) {
"-passes='default<O#>,other-pass'\n";
return 1;
}
if (!PassList.empty()) {
errs() << "The `opt -passname` syntax for the new pass manager is "
"deprecated, please use `opt -passes=<pipeline>` (or the `-p` "
"alias for a more concise version).\n";
errs() << "See https://llvm.org/docs/NewPassManager.html#invoking-opt "
"for more details on the pass pipeline syntax.\n\n";
}
std::string Pipeline = PassPipeline;
SmallVector<StringRef, 4> Passes;