Bug in build system (solved by a temporary hack)

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Tom

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Feb 9, 2012, 12:46:54 AM2/9/12

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Just downloaded current release and have had problems building. The culprit seems to be that I have g++ 4.4.5 (current on Ubuntu 10.10) and two headers (one I believe is auto-generated from the other) think that a g++ major of 4 has lambda support which is not true. That only happened with g++ 4.5 (a minor of 5).

The two offending files are:
./zdk/make/Common.mak
./zdk/make/Common.mak.in # <== I think this is the master file

The offending code block is:

ifeq ($(CXX_MAJOR),4)
CXXFLAGS+=-Wno-attributes
CXXFLAGS+=-std=c++0x
CXXFLAGS+=-DHAVE_LAMBDA_SUPPORT # <= I just commented out this line
endif

I think there is a way to get make to create a var that could be tested to be true if gcc is 4.5 or greater, but I leave that as an exercise for masochists. (I would just use Perl and auto-generate the offending master file.)

The build and installation thereafter went fine. So now I'm experimenting.

Thanks again for a great product, Cristian--it's sorely needed (I occasionally try gdb raw or ddd but give up in frustration soon thereafter).

Best regards,

-Tom

Tom Browder
Niceville, Florida
USA

C. Vlasceanu

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Feb 9, 2012, 2:39:45 AM2/9/12

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Tom

I am sorry about the bug. I will be fixed in the next commit. I developed this autoconf.ac function that now properly detects lambda support (rather than using the compiler version, which was a silly hack to begin with):

# Check for C++12 lambda support in the compiler

AC_DEFUN([AC_CXX_LAMBDA],

[AC_CACHE_CHECK([for C++11 Lambda compiler support],

[ac_cv_lambda],

[ac_cv_lambda=false

cat > tmp.cpp << ---end---

int main()

{

return [[]]()->int { return 0; }();

}

---end---

if $CXX -std=c++0x tmp.cpp 2>/dev/null; then

ac_cv_lambda=true

rm a.out

rm tmp.cpp])

if test "$ac_cv_lambda" = true; then

AC_DEFINE([HAVE_LAMBDA_SUPPORT], [1],

[Define if C++11 lambda functions are supported])

])

AC_CXX_LAMBDA

Thanks for using ZeroBUGS and keep the feedback coming!

Cristian

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