[llvm-dev] plugin-opt=save-temps doesn't work in LLVM Gold 5.0.0

[Dipanjan Das via llvm-dev]

To compile an auto-tooled project to bitcode, I used to use plugin-opt=save-temps switch as explained in: http://gbalats.github.io/2015/12/10/compiling-autotooled-projects-to-LLVM-bitcode.html. This switch works with LLVM 3.8.0.

However, it seems to have no effect with LLVM 5.0.0. I can see intermediate bitcode files on disk, but not the final one. Is the option removed altogether? Has the switch changed?

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Thanks & Regards,

Dipanjan

[Teresa Johnson via llvm-dev]

That documentation is a bit out of date.

The LLVM gold plugin (and the lld linker) now use a different LTO API (as of a year ago). There is actually a richer set of intermediate files emitted when you do save-temps. E.g.:

$ clang -flto main.c foo.c -Wl,-plugin-opt=save-temps -o testsavetemps

$ file testsavetemps*

testsavetemps:                    ELF 64-bit LSB  executable, x86-64, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.24, not stripped

testsavetemps.0.0.preopt.bc:      LLVM IR bitcode

testsavetemps.0.2.internalize.bc: LLVM IR bitcode

testsavetemps.0.4.opt.bc:         LLVM IR bitcode

testsavetemps.0.5.precodegen.bc:  LLVM IR bitcode

testsavetemps.o:                  ELF 64-bit LSB  relocatable, x86-64, version 1 (SYSV), not stripped

testsavetemps.resolution.txt:     ASCII text

Likely what you want is testsavetemps.0.5.precodegen.bc - the bitcode just before generating the native object (testsavetemps.o).

Teresa

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Teresa Johnson |

Software Engineer |

tejo...@google.com |

408-460-2413

[Dipanjan Das via llvm-dev]

Thank you so much, Teresa.