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| -rw-r--r-- | configure.ac | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac index 0297fae48..587a14af6 100644 --- a/configure.ac +++ b/configure.ac @@ -533,6 +533,23 @@ error AC_MSG_ERROR([GMP 4.2.0 or newer is required]) ]) +dnl Check if gmp.h is usable at link time; this may detect errors such as +dnl with GMP 4.1, which uses "extern __inline__" unconditionally with all +dnl GCC versions, which breaks by default with GCC 5 (this problem with +dnl GMP 4.1 is no longer possible as we now require GMP 4.2.0 or newer, +dnl but the same kind of problem may occur in the future). +dnl Note: No linking is done against the GMP library at this time, as we +dnl do not use any GMP symbol. The goal of this test is to avoid obscure +dnl errors with the following gmp.h tests. +AC_MSG_CHECKING(usable gmp.h at link time) +AC_LINK_IFELSE([AC_LANG_PROGRAM([[ +#include "gmp.h" +]],[[]])],[AC_MSG_RESULT(yes)],[ + AC_MSG_RESULT(no) + AC_MSG_ERROR([There is an incompatibility between gmp.h and the compiler. +See 'config.log' for details.]) +]) + dnl Check if we can use internal header files of GMP (only --with-gmp-build) if test "$use_gmp_build" = yes ; then AC_MSG_CHECKING(for gmp internal files) |