configure: Add -fno-ident when available

MinGW for i386-pc without this option generates a .rdata$zzz symbol that is
page-aligned and hence lzma_decompress no longer fits in its allocated space.
Additionally, MinGW with -fno-ident also saves a bit of space in modules. In
case of other compilers we already strip the relevant sections, so, this
option has no effect.

More info can be found at https://github.com/msys2/MINGW-packages/issues/21

Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>

diff --git a/configure.ac b/configure.ac
index 23c555c26974345fbdc6fb116065f2ef70471859..e07ba4b5685c82de79b36d3c98b4891b24fe57d4 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -999,6 +999,17 @@ if test "x$grub_cv_cc_fno_unwind_tables" = xyes; then
   TARGET_CFLAGS="$TARGET_CFLAGS -fno-unwind-tables"
 fi
 
+# Do not generate .ident sections.
+AC_CACHE_CHECK([whether -fno-ident works], [grub_cv_cc_fno_ident], [
+  CFLAGS="$TARGET_CFLAGS -fno-ident"
+  AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[]])],
+      [grub_cv_cc_fno_ident=yes],
+      [grub_cv_cc_fno_ident=no])
+])
+
+if test "x$grub_cv_cc_fno_ident" = xyes; then
+  TARGET_CFLAGS="$TARGET_CFLAGS -fno-ident"
+fi
 
 CFLAGS="$TARGET_CFLAGS"