On 2021-08-25 23:41:34 +0200, Vincent Lefevre wrote: > When I want to build MPFR with g++, I get: > > checking for __gmpz_init in -lgmp... no > configure: error: libgmp not found or uses a different ABI (including static > vs shared). > > due to > > dnl Check if we can link with GMP > AC_CHECK_LIB(gmp, __gmpz_init, [LIBS="-lgmp $LIBS"], > [AC_MSG_ERROR([libgmp not found or uses a different ABI (including static vs > shared). > Please read the INSTALL file -- see "In case of problem".])]) > > in the configure.ac file.
Note: the error is undefined reference to `__gmpz_init()' I've found the cause. With Autoconf 2.69, there was #ifdef __cplusplus extern "C" #endif at the beginning of the test program generated by Autoconf. This is no longer the case with Autoconf 2.71. A manual test confirms that these 3 lines make the difference. -- Vincent Lefèvre <vinc...@vinc17.net> - Web: <https://www.vinc17.net/> 100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/> Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)