[PATCH] Fix GCC 10+ build failure with zstd version 1.2.0 or older.

[Jim Wilson]

Extends the configure check for zstd.h to also verify the zstd version,
since gcc requires features that only exist in 1.3.0 and newer.  Without
this patch we get a build error for lto-compress.c when using an old zstd
version.

Tested with builds using zstd 0.5.1, 1.2.0, 1.3.0, and 1.3.3, and checking
to see whether zstd was enabled for the build or not.

OK?

Jim

        gcc/
        PR 97183
        * configure.ac (gcc_cv_header_zstd_h): Check ZSTD_VERISON_NUMBER.
        * configure: Regenerated.
---
 gcc/configure    | 11 ++++++++---
 gcc/configure.ac |  7 ++++++-
 2 files changed, 14 insertions(+), 4 deletions(-)

diff --git a/gcc/configure b/gcc/configure
index 33a3e34029f..b05a3714fb2 100755
--- a/gcc/configure
+++ b/gcc/configure
@@ -10022,9 +10022,14 @@ $as_echo_n "checking for zstd.h... " >&6; }
 if ${gcc_cv_header_zstd_h+:} false; then :
   $as_echo_n "(cached) " >&6
 else
-  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+  # We require version 1.3.0 or later.  This is the first version that has
+# ZSTD_getFrameContentSize.
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 #include <zstd.h>
+#if ZSTD_VERSION_NUMBER < 10300
+#error "need zstd 1.3.0 or better"
+#endif
 int
 main ()
 {
@@ -19013,7 +19018,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 19016 "configure"
+#line 19021 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -19119,7 +19124,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 19122 "configure"
+#line 19127 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
diff --git a/gcc/configure.ac b/gcc/configure.ac
index 975f6d97c4b..f5612161dcd 100644
--- a/gcc/configure.ac
+++ b/gcc/configure.ac
@@ -1376,8 +1376,13 @@ LDFLAGS="$LDFLAGS $ZSTD_LDFLAGS"
 
 AC_MSG_CHECKING(for zstd.h)
 AC_CACHE_VAL(gcc_cv_header_zstd_h,
+# We require version 1.3.0 or later.  This is the first version that has
+# ZSTD_getFrameContentSize.
 [AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
-[[#include <zstd.h>]])],
+[[#include <zstd.h>
+#if ZSTD_VERSION_NUMBER < 10300
+#error "need zstd 1.3.0 or better"
+#endif]])],
   [gcc_cv_header_zstd_h=yes],
   [gcc_cv_header_zstd_h=no])])
 AC_MSG_RESULT($gcc_cv_header_zstd_h)
-- 
2.17.1