Try replacing it with -pthread ...? https://gcc.gnu.org/onlinedocs/gcc-4.0.2/gcc/IA_002d64-Options.html On Thu, May 28, 2020 at 9:28 AM Jonathan Wakely via Gcc-help <gcc-help@xxxxxxxxxxx> wrote: > > On Thu, 28 May 2020 at 17:14, kiran kumar vangara via Gcc-help > <gcc-help@xxxxxxxxxxx> wrote: > > > > Team, > > > > We have been compiling cpp files with g++ compiler on Redhat Linux OS > > machine and as part of this -mt option was given for g++ and it produced > > required binary in case # 1 but produced an error in case#2 , I'm sharing > > g++ version and the Redhat Linux OS version being used to compile the cpp > > code details below .. Can you please let us know what is the meaning of > > flag -mt and why it works in case#1 but not in case#2 > > > > Case#1 > > ---------- > > g++ (GCC) 4.4.7 20120313 (Red Hat 4.4.7-23) > > > > Case# 2 > > ------------ > > g++ (GCC) 4.8.5 20150623 (Red Hat 4.8.5-39) > > > > In this case the error produced by compiler is > > > > g++: error: unrecognized command line option -mt > > > > your help will be greatly appreciated . > > You are using ancient versions of GCC which have not been supported by > the GCC project for many years. > > You say you are sharing the "Redhat Linux OS version" but you didn't. > It looks like you are using Red Hat Enterprise Linux versions 6 and 7, > but you didn't say which kind of hardware you're using. The -mt option > is an IA-64 option, and I don't think GCC 4.8 supports IA-64. You > probably get the error on the second machine because it's different > hardware. To find out what -mt means you should look in the manual for > the relevant GCC version. > > If you want support for compilers provided by Red Hat, you should ask > Red Hat, and provide more information than you provided here. >
