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Editorial Team
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Asked: 2026-06-04T12:33:41+00:00

I am able to compile a single file using gcc with -std=c++0x option. But

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I am able to compile a single file using gcc with -std=c++0x option. But I can’t do this through makefile. Here are the set of flags in my makefile (which after make complains about c++11 keywords):

MACHINE = $(shell echo `uname -s`-`uname -m` | sed "s/ //g")
CCC     = CC
CCC     = g++
CFLAGS  = -O3
CFLAGS  = -std=c++0x
CFLAGS  = -pg -D_DEBUG -g -c -Wall
LFLAGS  = -O
LFLAGS  = -pg -g

What am I missing?

Edit:
I changed it to the following, but I still get compile errors, which I don’t get with command line gcc invocation.

CXXFLAGS=-O3 -std=c++0x -pg -D_DEBUG -g -c -Wall
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1 Answer

  1. Editorial Team

    This way your makefile will use all of your CFLAGS:

    CFLAGS=-O3 -std=c++0x -pg -D_DEBUG -g -c -Wall

    You’re overriding them with each “CFLAGS=…” declaration.

    Moreover, it should be CXXFLAGS, not CFLAGS. CFLAGS is for C applications.

    As @Florian Sowade said, you could use CFLAGS += -O3 -std.... (or CXXFLAGS..), so that users can provide their own flags when executing make.

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