add support for --disable-gcov

For some targets (in my case VxWorks 5.5), libgcov does not compile due
to missing functions and macros such as getpid() and F_OK.

Incidentally, gcc/Makefile.in already contains comments such as

# Install gcov if it was compiled.

but there is no logic in place to actually allow gcov to not be
compiled.

So add an option for disabling build and install of libgcov and the
related host tools.

From-SVN: r262180

5 files changed, 34 insertions, 4 deletions

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 34a0e25..3604fd8 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,10 @@
+2018-06-27  Rasmus Villemoes  <rv@rasmusvillemoes.dk>
+
+	* configure.ac: Add --disable-gcov option.
+	* configure: Regenerate.
+	* Makefile.in: Honour @enable_gcov@.
+	* doc/install.texi: Document --disable-gcov.
+
 2018-06-27  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>
 
 	* config/arm/arm-cpus.in (cortex-a76): New entry.
diff --git a/gcc/Makefile.in b/gcc/Makefile.in
index d8f3e88..1f38cac 100644
--- a/gcc/Makefile.in
+++ b/gcc/Makefile.in
@@ -137,8 +137,10 @@ SUBDIRS =@subdirs@ build
 
 # Selection of languages to be made.
 CONFIG_LANGUAGES = @all_selected_languages@
-LANGUAGES = c gcov$(exeext) gcov-dump$(exeext) gcov-tool$(exeext) \
-            $(CONFIG_LANGUAGES)
+LANGUAGES = c $(CONFIG_LANGUAGES)
+ifeq (@enable_gcov@,yes)
+LANGUAGES += gcov$(exeext) gcov-dump$(exeext) gcov-tool$(exeext)
+endif
 
 # Default values for variables overridden in Makefile fragments.
 # CFLAGS is for the user to override to, e.g., do a cross build with -O2.
diff --git a/gcc/configure b/gcc/configure
index 60d3739..bfef4be 100755
--- a/gcc/configure
+++ b/gcc/configure
@@ -779,6 +779,7 @@ REPORT_BUGS_TEXI
 REPORT_BUGS_TO
 PKGVERSION
 CONFIGURE_SPECS
+enable_gcov
 enable_shared
 enable_fixed_point
 enable_decimal_float
@@ -914,6 +915,7 @@ enable_vtable_verify
 enable_objc_gc
 with_dwarf2
 enable_shared
+enable_gcov
 with_specs
 with_pkgversion
 with_bugurl
@@ -1634,6 +1636,7 @@ Optional Features:
   --enable-objc-gc        enable the use of Boehm's garbage collector with the
                           GNU Objective-C runtime
   --disable-shared        don't provide a shared libgcc
+  --disable-gcov          don't provide libgcov and related host tools
   --enable-languages=LIST specify which front-ends to build
   --disable-rpath         do not hardcode runtime library paths
   --enable-sjlj-exceptions
@@ -7628,6 +7631,15 @@ fi
 
 
 
+# Check whether --enable-gcov was given.
+if test "${enable_gcov+set}" = set; then :
+  enableval=$enable_gcov;
+else
+  enable_gcov=yes
+fi
+
+
+
 
 # Check whether --with-specs was given.
 if test "${with_specs+set}" = set; then :
@@ -18448,7 +18460,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 18451 "configure"
+#line 18463 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -18554,7 +18566,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 18557 "configure"
+#line 18569 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
diff --git a/gcc/configure.ac b/gcc/configure.ac
index 010ecd2..4fc851c 100644
--- a/gcc/configure.ac
+++ b/gcc/configure.ac
@@ -921,6 +921,11 @@ AC_ARG_ENABLE(shared,
 ], [enable_shared=yes])
 AC_SUBST(enable_shared)
 
+AC_ARG_ENABLE(gcov,
+[  --disable-gcov          don't provide libgcov and related host tools],
+[], [enable_gcov=yes])
+AC_SUBST(enable_gcov)
+
 AC_ARG_WITH(specs,
   [AS_HELP_STRING([--with-specs=SPECS],
                   [add SPECS to driver command-line processing])],
diff --git a/gcc/doc/install.texi b/gcc/doc/install.texi
index 7c5cdc7..03eaeed 100644
--- a/gcc/doc/install.texi
+++ b/gcc/doc/install.texi
@@ -1044,6 +1044,10 @@ virtual calls in verifiable mode at all.  However the libvtv library will
 still be built (see @option{--disable-libvtv} to turn off building libvtv).
 @option{--disable-vtable-verify} is the default.
 
+@item --disable-gcov
+Specify that the run-time library used for coverage analysis
+and associated host tools should not be built.
+
 @item --disable-multilib
 Specify that multiple target
 libraries to support different target variants, calling