On 12/02/2009 04:44 AM, Erik de Castro Lopo wrote:
Eric Blake wrote:
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According to Erik de Castro Lopo on 12/1/2009 8:12 PM:
AC_LANG([C++])
AC_ADD_CXXFLAGS([-std=gnu++0x])
AC_CHECK_HEADER(cstdint)
With proper m4 quoting, that would be:
AC_CHECK_HEADER([cstdint])
checking cstdint usability... yes
checking cstdint presence... no
configure: WARNING: cstdint: accepted by the compiler, rejected by the preprocessor!
configure: WARNING: cstdint: proceeding with the compiler's result
checking for cstdint... yes
Can we see the corresponding config.log?
Ah, that shed some light:
configure:18130: checking if g++ accepts -std=gnu++0x
configure:18147: g++ -o conftest -g -O2 -Wall -Wextra -Wsign-compare -Wno-ctor-dtor-privacy
-Wno-non-virtual-dtor -Wformat -Werror -Wno-deprecated -std=gnu++0x conftest.cpp -lcups>&5
configure:18147: $? = 0
configure:18148: result: yes
configure:18160: checking cstdint usability
configure:18160: g++ -c -g -O2 -Wall -Wextra -Wsign-compare -Wno-ctor-dtor-privacy \
-Wno-non-virtual-dtor -Wformat -Werror -Wno-deprecated -std=gnu++0x conftest.cpp>&5
configure:18160: $? = 0
configure:18160: result: yes
configure:18160: checking cstdint presence
configure:18160: g++ -E conftest.cpp
In file included from /usr/include/c++/4.4/cstdint:35,
from conftest.cpp:32:
/usr/include/c++/4.4/c++0x_warning.h:31:2: error: #error This file requires compiler and
library support for the upcoming ISO C++ standard, C++0x. This support is currently
experimental, and must be enabled with the -std=c++0x or -std=gnu++0x compiler options.
configure:18160: $? = 1
The problem is that when checking for<cstdint>, -std=gnu++0x is not on the
command line.
Look again. AFAIS from your config.log, -std=gnu++0x is on the command line.
AFAICT, your problem is you using -Werror. By applying it the warning
gcc issues becomes an error which causes the check in configure to break.
Ralf
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