Remove build date from the output of --version

Closes #25812.

Author: Johannes Oertel

mk/main.mk

@@ -74,9 +74,6 @@ ifneq ($(wildcard $(subst $(SPACE),\$(SPACE),$(CFG_GIT_DIR))),)
 endif
 endif
 
-CFG_BUILD_DATE = $(shell date +%F)
-CFG_VERSION += (built $(CFG_BUILD_DATE))
-
 # Windows exe's need numeric versions - don't use anything but
 # numbers and dots here
 CFG_VERSION_WIN = $(CFG_RELEASE_NUM)
@@ -333,7 +330,6 @@ endif
 ifdef CFG_VER_HASH
 export CFG_VER_HASH
 endif
-export CFG_BUILD_DATE
 export CFG_VERSION
 export CFG_VERSION_WIN
 export CFG_RELEASE

src/librustc_driver/lib.rs

@@ -483,10 +483,6 @@ pub fn commit_date_str() -> Option<&'static str> {
     option_env!("CFG_VER_DATE")
 }
 
-pub fn build_date_str() -> Option<&'static str> {
-    option_env!("CFG_BUILD_DATE")
-}
-
 /// Prints version information and returns None on success or an error
 /// message on panic.
 pub fn version(binary: &str, matches: &getopts::Matches) {
@@ -498,7 +494,6 @@ pub fn version(binary: &str, matches: &getopts::Matches) {
         println!("binary: {}", binary);
         println!("commit-hash: {}", unw(commit_hash_str()));
         println!("commit-date: {}", unw(commit_date_str()));
-        println!("build-date: {}", unw(build_date_str()));
         println!("host: {}", config::host_triple());
         println!("release: {}", unw(release_str()));
     }