[PATCH 2/9] gdb: Make GMP a required dependency for building GDB

[Joel Brobecker]

This commit modifies gdb's configure script to trigger an error
if we cannot find a usable libgmp.

For the record, making this a requirement was discussed in March 2018:
https://sourceware.org/pipermail/gdb-patches/2018-March/147373.html

gdb/ChangeLog:

        * configure.ac: Generate an error if a usable GMP library
        could not be found.
        * configure: Regenerate.
---
 gdb/configure    | 3 +++
 gdb/configure.ac | 3 +++
 2 files changed, 6 insertions(+)

diff --git a/gdb/configure b/gdb/configure
index 2bf0856..a3e73b4 100755
--- a/gdb/configure
+++ b/gdb/configure
@@ -10469,6 +10469,9 @@ $as_echo "$LIBGMP" >&6; }
 
 
 
+if test "$HAVE_LIBGMP" != yes; then
+  as_fn_error $? "GMP is missing or unusable" "$LINENO" 5
+fi
 
 
 # Check whether --with-mpfr was given.
diff --git a/gdb/configure.ac b/gdb/configure.ac
index 0264a4f..32f25d9 100644
--- a/gdb/configure.ac
+++ b/gdb/configure.ac
@@ -687,6 +687,9 @@ fi
 AC_LIB_HAVE_LINKFLAGS([gmp], [], [#include <gmp.h>],
                       [mpz_t n;
                        mpz_init (n);])
+if test "$HAVE_LIBGMP" != yes; then
+  AC_MSG_ERROR([GMP is missing or unusable])
+fi
 
 AC_ARG_WITH(mpfr,
   AS_HELP_STRING([--with-mpfr], [include MPFR support (auto/yes/no)]),
-- 
2.1.4