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Only enable GMP C++ interface if a C++ compiler is available #728

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Only enable GMP C++ interface if a C++ compiler is available #728

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12 changes: 12 additions & 0 deletions cnf/configure.in
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Original file line number Diff line number Diff line change
Expand Up @@ -37,6 +37,17 @@ fi
AC_DEFINE_UNQUOTED([HAVE_ARITHRIGHTSHIFT],[$HAVE_ARITHRIGHTSHIFT],
[define as 1 if >> for long int behaves like an arithmetic right shift for negative numbers])

# autoconf may set CXX to g++ even if there is no working C++ compiler.
# So verify that CXX really is able to compile C++ code.
AC_LANG_PUSH([C++])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
[[#include <iostream>
#ifndef __cplusplus
#error "broken C++"
#endif]])],,
[CXX=;])
AC_LANG_POP([C++])

#
# Assume that cross-compiling is for 32 bit systems
# (alpha/NT will have to wait)
Expand Down Expand Up @@ -370,6 +381,7 @@ dnl ## generate a makefile
dnl ##

AC_SUBST(CC)
AC_SUBST(CXX)
AC_SUBST(CFLAGS)
AC_SUBST(CPPFLAGS)
AC_SUBST(LDFLAGS)
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