From bf483155e506b62a515fda9e92cbc4dd43629e70 Mon Sep 17 00:00:00 2001
From: Carl Edquist <edquist@cs.wisc.edu>
Date: Mon, 10 May 2021 05:22:11 -0500
Subject: [PATCH] build: fix __get_cpuid_count check to catch link failure

The test program will compile successfully even if __get_cpuid_count
is not declared.  The error for the missing symbol will only show up
at link time.  Thus, use AC_LINK_IFELSE instead of AC_COMPILE_IFELSE.

* configure.ac (__get_cpuid_count check): Use C_LINK_IFELSE instead
of AC_COMPILE_IFELSE.
(__get_cpuid check): Likewise.
---
 configure.ac | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/configure.ac b/configure.ac
index f0fbbd9b73..c4d8ec0b6c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -525,7 +525,7 @@ LDFLAGS=$ac_save_LDFLAGS
 ac_c_werror_flag=$cu_save_c_werror_flag
 
 AC_MSG_CHECKING([if __get_cpuid available])
-AC_COMPILE_IFELSE(
+AC_LINK_IFELSE(
   [AC_LANG_SOURCE([[
     #include <cpuid.h>
 
@@ -576,7 +576,7 @@ AM_CONDITIONAL([USE_PCLMUL_CRC32],
 CFLAGS=$ac_save_CFLAGS
 
 AC_MSG_CHECKING([if __get_cpuid_count exists])
-AC_COMPILE_IFELSE(
+AC_LINK_IFELSE(
   [AC_LANG_SOURCE([[
     #include <cpuid.h>
 
-- 
2.47.2