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

gcc/ChangeLog

+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.

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.

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

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])],

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

libgcc/ChangeLog

+2018-06-27  Rasmus Villemoes  <rv@rasmusvillemoes.dk>
+
+	* configure.ac: Add --disable-gcov option.
+	* configure: Regenerate.
+	* Makefile.in: Honour @enable_gcov@.
+
 2018-06-21  Christophe Lyon  <christophe.lyon@linaro.org>
 
 	* config/arm/lib1funcs.S (__ARM_ARCH__): Remove definitions, use

libgcc/Makefile.in

@@ -36,6 +36,7 @@ SHELL = @SHELL@
 
 cpu_type = @cpu_type@
 enable_shared = @enable_shared@
+enable_gcov = @enable_gcov@
 double_type_size = @double_type_size@
 long_double_type_size = @long_double_type_size@
 decimal_float = @decimal_float@
@@ -941,7 +942,10 @@ libgcc.a libgcov.a libunwind.a libgcc_eh.a:
 
 	$(RANLIB) $@
 
-all: libgcc.a libgcov.a
+all: libgcc.a
+ifeq ($(enable_gcov),yes)
+all: libgcov.a
+endif
 
 ifneq ($(LIBUNWIND),)
 all: libunwind.a
@@ -1164,9 +1168,11 @@ install-leaf: $(install-shared) $(install-libunwind)
 	$(INSTALL_DATA) libgcc.a $(DESTDIR)$(inst_libdir)/
 	chmod 644 $(DESTDIR)$(inst_libdir)/libgcc.a
 	$(RANLIB) $(DESTDIR)$(inst_libdir)/libgcc.a
+ifeq ($(enable_libgcov),yes)
 	$(INSTALL_DATA) libgcov.a $(DESTDIR)$(inst_libdir)/
 	chmod 644 $(DESTDIR)$(inst_libdir)/libgcov.a
 	$(RANLIB) $(DESTDIR)$(inst_libdir)/libgcov.a
+endif
 
 	parts="$(INSTALL_PARTS)";				\
 	for file in $$parts; do					\

libgcc/configure

@@ -620,6 +620,7 @@ build_cpu
 build
 with_aix_soname
 enable_vtable_verify
+enable_gcov
 enable_shared
 libgcc_topdir
 target_alias
@@ -667,6 +668,7 @@ with_target_subdir
 with_cross_host
 with_ld
 enable_shared
+enable_gcov
 enable_vtable_verify
 with_aix_soname
 enable_version_specific_runtime_libs
@@ -1306,6 +1308,7 @@ Optional Features:
   --disable-FEATURE       do not include FEATURE (same as --enable-FEATURE=no)
   --enable-FEATURE[=ARG]  include FEATURE [ARG=yes]
   --disable-shared        don't provide a shared libgcc
+  --disable-gcov          don't provide libgcov and related host tools
   --enable-vtable-verify    Enable vtable verification feature
   --enable-version-specific-runtime-libs    Specify that runtime libraries should be installed in a compiler-specific directory
   --enable-maintainer-mode
@@ -2199,6 +2202,15 @@ fi
 
 
 
+# Check whether --enable-gcov was given.
+if test "${enable_gcov+set}" = set; then :
+  enableval=$enable_gcov;
+else
+  enable_gcov=yes
+fi
+
+
+
 # Check whether --enable-vtable-verify was given.
 if test "${enable_vtable_verify+set}" = set; then :
   enableval=$enable_vtable_verify; case "$enableval" in

libgcc/configure.ac

@@ -68,6 +68,11 @@ 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_ENABLE(vtable-verify,
 [  --enable-vtable-verify    Enable vtable verification feature ],
 [case "$enableval" in