darwin, configuration, check properly for dwarf2 debug line support

This corrects a long-standing misconfiguration for Darwin.
The assembler supports the “.file” and “.loc” directives, but
the GCC configury was not detecting this because it was
using objdump, which does not exist on most Darwin installations.

We added support for “otool” to GCC and now we can use that to
make the check that’s done with objdump on ELF targets.

2018-12-24  Iain Sandoe  <iain@sandoe.co.uk>

	* configure.ac (dwarf2_debug_line): Check for the debug_line
	section using otool when there’s no objdump available.
	* configure: Regenerate.

From-SVN: r267393

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 479083e..310bbec 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2018-12-24  Iain Sandoe  <iain@sandoe.co.uk>
+
+       * configure.ac (dwarf2_debug_line): Check for the debug_line
+       section using otool when there’s no objdump available.
+       * configure: Regenerate.
+
 2018-12-24  Jan Hubicka  <hubicka@ucw.cz>
 
        * ipa-utils.c (ipa_merge_profiles): Fix updating of fnsummary;

diff --git a/gcc/configure b/gcc/configure
index efbf621..caebe4c 100755 (executable)
--- a/gcc/configure
+++ b/gcc/configure
@@ -27724,6 +27724,10 @@ fi
    && $gcc_cv_objdump -h conftest.o 2> /dev/null \
       | grep debug_line > /dev/null 2>&1; then
      gcc_cv_as_dwarf2_debug_line=yes
+   elif test x$gcc_cv_otool != x \
+   && $gcc_cv_otool -l conftest.o 2> /dev/null \
+      | grep debug_line > /dev/null 2>&1; then
+     gcc_cv_as_dwarf2_debug_line=yes
    fi
     else
       echo "configure: failed program was" >&5

diff --git a/gcc/configure.ac b/gcc/configure.ac
index 7fce52a..a101232 100644 (file)
--- a/gcc/configure.ac
+++ b/gcc/configure.ac
@@ -4926,6 +4926,10 @@ if test x"$insn" != x; then
    && $gcc_cv_objdump -h conftest.o 2> /dev/null \
       | grep debug_line > /dev/null 2>&1; then
      gcc_cv_as_dwarf2_debug_line=yes
+   elif test x$gcc_cv_otool != x \
+   && $gcc_cv_otool -l conftest.o 2> /dev/null \
+      | grep debug_line > /dev/null 2>&1; then
+     gcc_cv_as_dwarf2_debug_line=yes
    fi])
 
 # The .debug_line file table must be in the exact order that