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Asked: 2026-06-03T06:21:39+00:00

emsr’s answer to this question: How can I specify that I want C++0x in

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emsr’s answer to this question: How can I specify that I want C++0x in Makefile.am? is the solution to a problem I have. No I have a new one:

I put the macro definition into m4/check.m4 and change my configure.ac accordingly:

AC_INIT([CppSs], [0.1], [brinkmann@hlrs.de])
m4_include([m4/check.m4])
LT_INIT

AC_CONFIG_SRCDIR([src/main.cc])
AC_CONFIG_HEADERS([config.h])
AC_CONFIG_FILES([Makefile src/Makefile])
AC_CONFIG_MACRO_DIR([m4])

# Checks for programs.
AC_PROG_CXX
AC_PROG_CC

# ...

# Check for C++0x features
AC_COMPILE_STDCXX_OX
AC_HEADER_STDCXX_11

AC_OUTPUT

Now when I run autoreconf -v I get these messages (tried -fiv also):

configure.ac:43: warning: AC_COMPILE_STDCXX_11 is m4_require'd but not m4_defun'd 
../../lib/m4sugar/m4sh.m4:606: AS_IF is expanded from... 
../../lib/autoconf/general.m4:2032: AC_CACHE_VAL is expanded from... 
../../lib/autoconf/general.m4:2053: AC_CACHE_CHECK is expanded from... m4/cppss.
m4:90: AC_HEADER_STDCXX_11 is expanded from...

./configure yields:

...
./configure: line 16234: AC_COMPILE_STDCXX_OX: command not found
./configure: line 16235: AC_COMPILE_STDCXX_11: command not found
...

What am I missing?

Thanks, Steffen

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1 Answer

  1. Editorial Team

    I solved it myself… It was a mixture of several typos (0 instead of O and alike) and mistakes in the order of putting the macros in the configure.ac. Also, I found out, that if it’s just a few macros, it’s easier to put them in a file called acinclude.m4 in the same directory as configure.ac and get rid of the 

    m4_include([m4/check.m4])

    And there is an error in the libstdc++ manual in the part at the bottom of the page where the c++11 features are checked, as (at least in gcc) there is no compiler option -std=c++11. It should be -std=c++0x.

    Cheers, Steffen

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