grep branch, master, updated. v2.25-103-gdb39f34

[Paul Eggert]

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http://git.savannah.gnu.org/cgit/grep.git/commit/?id=db39f34e8509b314cf0f38dcb3107842d6c41156


commit db39f34e8509b314cf0f38dcb3107842d6c41156
Author: Paul Eggert <address@hidden>
Date:   Tue Sep 27 08:48:17 2016 -0700

    build: port .git builds to older GCC
    
    Problem reported by Dagobert Michelsen in:
    http://lists.gnu.org/archive/html/grep-devel/2016-09/msg00018.html
    * configure.ac (gl_gcc_warnings): Default to false if .git
    exists but GCC is too old.

diff --git a/configure.ac b/configure.ac
index afb8cd2..202e30b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -109,10 +109,17 @@ AC_ARG_ENABLE([gcc-warnings],
      *)      AC_MSG_ERROR([bad value $enableval for gcc-warnings option]) ;;
    esac
    gl_gcc_warnings=$enableval],
-  [if test -d "$srcdir"/.git; then
-     gl_gcc_warnings=yes
-   else
-     gl_gcc_warnings=no
+  [gl_gcc_warnings=no
+   if test "$GCC" = yes && test -d "$srcdir"/.git; then
+     AC_COMPILE_IFELSE(
+       [AC_LANG_PROGRAM([[
+          #if 6 < __GNUC__ + (2 <= __GNUC_MINOR__)
+            int main (void) { return 0; }
+          #else
+            #error "This GCC is too old."
+          #endif
+          ]])],
+       [gl_gcc_warnings=yes])
    fi]
 )
 

-----------------------------------------------------------------------

Summary of changes:
 configure.ac |   15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)


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