Merge #6822

6822: Read version of rustc that compiled proc macro r=edwin0cheng a=jsomedon

Signed-off-by: Jay Somedon <[email protected]>

This PR is to fix #6174.

I basically
* added two methods, `read_version` and `read_section`(used by `read_version`)
* two new crates `snap` and `object` to be used by those two methods

I just noticed that some part of code were auto-reformatted by rust-analyzer on file save. Does it matter?

Co-authored-by: Jay Somedon <[email protected]>
Co-authored-by: Edwin Cheng <[email protected]>

1 files changed, 19 insertions, 0 deletions

diff --git a/Cargo.lock b/Cargo.lock
index 51a07abe3..87cf1bf27 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -897,6 +897,16 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0ee1c47aaa256ecabcaea351eae4a9b01ef39ed810004e298d2511ed284b1525"
 
 [[package]]
+name = "memmap"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6585fd95e7bb50d6cc31e20d4cf9afb4e2ba16c5846fc76793f11218da9c475b"
+dependencies = [
+ "libc",
+ "winapi",
+]
+
+[[package]]
 name = "memmap2"
 version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1159,8 +1169,11 @@ dependencies = [
  "crossbeam-channel",
  "jod-thread",
  "log",
+ "memmap",
+ "object",
  "serde",
  "serde_json",
+ "snap",
  "stdx",
  "tt",
 ]
@@ -1546,6 +1559,12 @@ dependencies = [
 ]
 
 [[package]]
+name = "snap"
+version = "1.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dc725476a1398f0480d56cd0ad381f6f32acf2642704456f8f59a35df464b59a"
+
+[[package]]
 name = "socket2"
 version = "0.3.19"
 source = "registry+https://github.com/rust-lang/crates.io-index"