* configure.ac: Test for assembler tolerance to # 0 "".

* configure, config.in: Rebuilt.
* final.c (final_scan_insn): Emit it if HAVE_AS_LINE_ZERO.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@122879 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 24 insertions, 0 deletions

diff --git a/gcc/configure.ac b/gcc/configure.ac
index ed5fb203eef..768cff05208 100644
--- a/gcc/configure.ac
+++ b/gcc/configure.ac
@@ -3069,6 +3069,30 @@ if test x"$insn" != x; then
 [Define if your assembler supports the --gstabs option.])])
 fi
 
+AC_CACHE_CHECK([assembler for tolerance to line number 0],
+ [gcc_cv_as_line_zero],
+ [gcc_cv_as_line_zero=no
+  if test $in_tree_gas = yes; then
+    gcc_GAS_VERSION_GTE_IFELSE([elf,2,16,91], [gcc_cv_as_line_zero=yes])
+  elif test "x$gcc_cv_as" != x; then
+    { echo '# 1 "test.s" 1'; echo '# 0 "" 2'; } > conftest.s
+    if AC_TRY_COMMAND([$gcc_cv_as -o conftest.o conftest.s >&AS_MESSAGE_LOG_FD 2>conftest.out]) &&
+       test "x`cat conftest.out`" = x
+    then
+      gcc_cv_as_line_zero=yes
+    else
+      echo "configure: failed program was" >&AS_MESSAGE_LOG_FD
+      cat conftest.s >&AS_MESSAGE_LOG_FD
+      echo "configure: error output was" >&AS_MESSAGE_LOG_FD
+      cat conftest.out >&AS_MESSAGE_LOG_FD
+    fi
+    rm -f conftest.o conftest.s conftest.out
+  fi])
+if test "x$gcc_cv_as_line_zero" = xyes; then
+  AC_DEFINE([HAVE_AS_LINE_ZERO], 1,
+[Define if the assembler won't complain about a line such as # 0 "" 2.])
+fi
+
 AC_MSG_CHECKING(linker read-only and read-write section mixing)
 gcc_cv_ld_ro_rw_mix=unknown
 if test $in_tree_ld = yes ; then