2009-07-17 Jerry Quinn <jlquinn@optonline.net>

	* directives.c (do_linemarker, do_line): Use CPP_STRING for
	ignored enum value.
	* files.c (find_file_in_dir): Add cast from void* to char*.
	* symtab.c (ht_lookup_with_hash): Add cast from void* to char*.
	* Makefile.in: (WARN_CFLAGS): Use general and C-specific
	warnings.
	(CXX, CXXFLAGS, WARN_CXXFLAGS, ALL_CXXFLAGS,
	ENABLE_BUILD_WITH_CXX, CCDEPMODE, CXXDEPMODE, COMPILER,
	COMPILER_FLAGS): New.
	(DEPMODE): Set from CCDEPMODE or CXXDEPMODE.
	(COMPILE.base): Use COMPILER instead of CC.  Use COMPILER_FLAGS
	instead of ALL_CFLAGS.
	* configure.ac: Invoke AC_PROG_CXX.  Separate C-specific warnings
	from other warnings.  Add -Wc++-compat to C-specific warnings.
	Check for --enable-build-with-cxx.  Set and substitute
	ENABLE_BUILD_WITH_CXX.  Invoke ZW_PROG_COMPILER_DEPENDENCIES
	according to ENABLE_BUILD_WITH_CXX.  Invoke AC_LANG before
	AC_CHECK_HEADERS.
	* configure: Rebuild.
	* include/cpp-id-data.h: Remove extern "C".
	* include/line-map.h: Likewise.
	* include/mkdeps.h: Likewise.
	* include/symtab.h: Likewise.
	* internal.h: Likewise.




git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@149763 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 29 insertions, 4 deletions

diff --git a/libcpp/configure.ac b/libcpp/configure.ac
index 833eb435980..a3ab8f551c3 100644
--- a/libcpp/configure.ac
+++ b/libcpp/configure.ac
@@ -11,8 +11,17 @@ AC_CANONICAL_SYSTEM
 AC_PROG_MAKE_SET
 AC_PROG_INSTALL
 AC_PROG_CC
+AC_PROG_CXX
 AC_PROG_RANLIB
 
+# See if we are building gcc with C++.
+# Do this early so setting lang to C++ affects following tests
+AC_ARG_ENABLE(build-with-cxx,
+[  --enable-build-with-cxx build with C++ compiler instead of C compiler],
+ENABLE_BUILD_WITH_CXX=$enableval,
+ENABLE_BUILD_WITH_CXX=no)
+AC_SUBST(ENABLE_BUILD_WITH_CXX)
+
 MISSING=`cd $ac_aux_dir && ${PWDCMD-pwd}`/missing
 AC_CHECK_PROGS([ACLOCAL], [aclocal], [$MISSING aclocal])
 AC_CHECK_PROGS([AUTOCONF], [autoconf], [$MISSING autoconf])
@@ -21,9 +30,10 @@ AC_CHECK_PROGS([AUTOHEADER], [autoheader], [$MISSING autoheader])
 # Figure out what compiler warnings we can enable.
 # See config/warnings.m4 for details.
 
-ACX_PROG_CC_WARNING_OPTS([-W -Wall -Wwrite-strings -Wstrict-prototypes \
-			  -Wmissing-prototypes -Wold-style-definition \
-			  -Wmissing-format-attribute])
+ACX_PROG_CC_WARNING_OPTS([-W -Wall -Wwrite-strings \
+			  -Wmissing-format-attribute], [warn])
+ACX_PROG_CC_WARNING_OPTS([-Wstrict-prototypes -Wmissing-prototypes \
+			  -Wold-style-definition -Wc++-compat], [c_warn])
 ACX_PROG_CC_WARNING_ALMOST_PEDANTIC([-Wno-long-long])
 
 # Only enable with --enable-werror-always until existing warnings are
@@ -32,13 +42,28 @@ ACX_PROG_CC_WARNINGS_ARE_ERRORS([manual])
 
 # Dependency checking.
 ZW_CREATE_DEPDIR
+if test "$ENABLE_BUILD_WITH_CXX" == "no"; then
 ZW_PROG_COMPILER_DEPENDENCIES([CC])
+else
+ZW_PROG_COMPILER_DEPENDENCIES([CXX])
+fi
 
 # Checks for header files.
 AC_HEADER_TIME
 ACX_HEADER_STRING
-AC_CHECK_HEADERS(locale.h fcntl.h limits.h stddef.h \
+
+# AC_CHECK_HEADERS is repeated to work around apparent autoconf 2.59 bug.  If
+# AC_CHECK_HEADERS comes after the if clause, the last AC_LANG call gets used,
+# no matter which branch is taken.
+if test "$ENABLE_BUILD_WITH_CXX" == "no"; then
+   AC_LANG(C)
+   AC_CHECK_HEADERS(locale.h fcntl.h limits.h stddef.h \
 	stdlib.h strings.h string.h sys/file.h unistd.h)
+else
+   AC_LANG(C++)
+   AC_CHECK_HEADERS(locale.h fcntl.h limits.h stddef.h \
+	stdlib.h strings.h string.h sys/file.h unistd.h)
+fi
 
 # Checks for typedefs, structures, and compiler characteristics.
 AC_C_CONST