https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66848
--- Comment #19 from Jack Howarth <howarth.at.gcc at gmail dot com> --- This thread... http://www.hpl.hp.com/hosted/linux/mail-archives/gc/2011-April/004472.html suggests that the boehm-gc is older than I suspected (as it claims gcc's copy is based on the 6.6 release). As far as I can tell, the proposal to update gcc's boehm-gc to 7.2 never progressed past initial discussions. http://www.hpl.hp.com/hosted/linux/mail-archives/gc/2011-April/004516.html The thread pretty much dies off at that point.