Revert "configure: Leverage gcc warn options to enable safe use of C99 features where possible."

This reverts commit 79daa510c7.

I apparently hadn't done a clean build when testing this; it broke the
build for Tom, Ben, and myself.  We like the idea; let's try a v2.

configure.ac

@@ -263,18 +263,6 @@ if test "x$GCC" = xyes; then
     # gcc's builtin memcmp is slower than glibc's
     # http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43052
     CFLAGS="$CFLAGS -fno-builtin-memcmp"
-
-    # Flags to help ensure that certain portions of the code -- and only those
-    # portions -- can be built with MSVC:
-    # - src/util, src/gallium/auxiliary, and src/gallium/drivers/llvmpipe needs
-    #   to build with Windows SDK 7.0.7600, which bundles MSVC 2008
-    # - non-Linux/Posix OpenGL portions needs to build on MSVC 2013 (which
-    #   supports most of C99)
-    # - the rest has no compiler compiler restrictions
-    MSVC2013_COMPAT_CFLAGS="-Werror=vla -Werror=pointer-arith"
-    MSVC2013_COMPAT_CXXFLAGS="-Werror=vla -Werror=pointer-arith"
-    MSVC2008_COMPAT_CFLAGS="$MSVC2013_COMPAT_CFLAGS -Werror=declaration-after-statement"
-    MSVC2008_COMPAT_CXXFLAGS="$MSVC2013_COMPAT_CXXFLAGS"
 fi
 if test "x$GXX" = xyes; then
     CXXFLAGS="$CXXFLAGS -Wall"
@@ -300,11 +288,6 @@ if test "x$GXX" = xyes; then
     CXXFLAGS="$CXXFLAGS -fno-builtin-memcmp"
 fi
 
-AC_SUBST([MSVC2013_COMPAT_CFLAGS])
-AC_SUBST([MSVC2013_COMPAT_CXXFLAGS])
-AC_SUBST([MSVC2008_COMPAT_CFLAGS])
-AC_SUBST([MSVC2008_COMPAT_CXXFLAGS])
-
 dnl even if the compiler appears to support it, using visibility attributes isn't
 dnl going to do anything useful currently on cygwin apart from emit lots of warnings
 case "$host_os" in

src/egl/main/Makefile.am

@@ -26,7 +26,6 @@ AM_CFLAGS = \
 	-I$(top_srcdir)/src/gbm/main \
 	$(DEFINES) \
 	$(VISIBILITY_CFLAGS) \
-	$(MSVC2013_COMPAT_CFLAGS) \
 	$(EGL_CFLAGS) \
 	-D_EGL_NATIVE_PLATFORM=$(EGL_NATIVE_PLATFORM) \
 	-D_EGL_DRIVER_SEARCH_DIR=\"$(libdir)/egl\" \

src/gallium/auxiliary/Makefile.am

@@ -12,12 +12,9 @@ noinst_LTLIBRARIES = libgallium.la
 AM_CFLAGS = \
 	-I$(top_srcdir)/src/gallium/auxiliary/util \
 	$(GALLIUM_CFLAGS) \
-	$(VISIBILITY_CFLAGS) \
+	$(VISIBILITY_CFLAGS)
-	$(MSVC2008_COMPAT_CXXFLAGS)
 
-AM_CXXFLAGS = \
+AM_CXXFLAGS = $(VISIBILITY_CXXFLAGS)
-	$(VISIBILITY_CXXFLAGS) \
-	$(MSVC2008_COMPAT_CXXFLAGS)
 
 libgallium_la_SOURCES = \
 	$(C_SOURCES) \

src/gallium/drivers/llvmpipe/Makefile.am

@@ -25,12 +25,10 @@ include $(top_srcdir)/src/gallium/Automake.inc
 
 AM_CFLAGS = \
 	$(GALLIUM_DRIVER_CFLAGS) \
-	$(LLVM_CFLAGS) \
+	$(LLVM_CFLAGS)
-	$(MSVC2008_COMPAT_CFLAGS)
 AM_CXXFLAGS= \
 	$(GALLIUM_DRIVER_CXXFLAGS) \
-	$(LLVM_CXXFLAGS) \
+	$(LLVM_CXXFLAGS)
-	$(MSVC2008_COMPAT_CXXFLAGS)
 
 noinst_LTLIBRARIES = libllvmpipe.la
 

src/gallium/state_trackers/egl/Makefile.am

@@ -27,8 +27,7 @@ include $(top_srcdir)/src/gallium/Automake.inc
 
 AM_CFLAGS = \
 	$(GALLIUM_CFLAGS) \
-	$(VISIBILITY_CFLAGS) \
+	$(VISIBILITY_CFLAGS)
-	$(MSVC2013_COMPAT_CFLAGS)
 
 AM_CPPFLAGS = \
 	-I$(top_srcdir)/src/egl/main \

src/gallium/targets/egl-static/Makefile.am

@@ -31,8 +31,7 @@
 include $(top_srcdir)/src/gallium/Automake.inc
 
 AM_CFLAGS = \
-	$(GALLIUM_TARGET_CFLAGS) \
+	$(GALLIUM_TARGET_CFLAGS)
-	$(MSVC2013_COMPAT_CFLAGS)
 
 AM_CPPFLAGS = \
 	-I$(top_srcdir)/src/gallium/state_trackers/egl \

src/glsl/Makefile.am

@@ -33,12 +33,8 @@ AM_CPPFLAGS = \
 	-I$(top_srcdir)/src/gtest/include \
 	-I$(top_builddir)/src/glsl/nir \
 	$(DEFINES)
-AM_CFLAGS = \
+AM_CFLAGS = $(VISIBILITY_CFLAGS)
-	$(VISIBILITY_CFLAGS) \
+AM_CXXFLAGS = $(VISIBILITY_CXXFLAGS)
-	$(MSVC2013_COMPAT_CFLAGS)
-AM_CXXFLAGS = \
-	$(VISIBILITY_CXXFLAGS) \
-	$(MSVC2013_COMPAT_CXXFLAGS)
 
 EXTRA_DIST = tests glcpp/tests README TODO glcpp/README	\
 	glsl_lexer.ll					\

src/loader/Makefile.am

@@ -30,7 +30,6 @@ libloader_la_CPPFLAGS = \
 	-I$(top_srcdir)/include \
 	-I$(top_srcdir)/src \
 	$(VISIBILITY_CFLAGS) \
-	$(MSVC2013_COMPAT_CFLAGS) \
 	$(LIBUDEV_CFLAGS)
 
 libloader_la_SOURCES = $(LOADER_C_FILES)

src/mapi/Makefile.am

@@ -39,9 +39,7 @@ EXTRA_DIST = \
 	glapi/SConscript \
 	shared-glapi/SConscript
 
-AM_CFLAGS = \
+AM_CFLAGS = $(PTHREAD_CFLAGS)
-	$(PTHREAD_CFLAGS) \
-	$(MSVC2013_COMPAT_CFLAGS)
 AM_CPPFLAGS =							\
 	$(DEFINES)						\
 	$(SELINUX_CFLAGS)					\

src/mesa/Makefile.am

@@ -136,14 +136,8 @@ noinst_LTLIBRARIES += libmesagallium.la
 endif
 
 AM_CPPFLAGS = $(DEFINES) $(INCLUDE_DIRS)
-AM_CFLAGS = \
+AM_CFLAGS = $(LLVM_CFLAGS) $(VISIBILITY_CFLAGS)
-	$(LLVM_CFLAGS) \
+AM_CXXFLAGS = $(LLVM_CFLAGS) $(VISIBILITY_CXXFLAGS)
-	$(VISIBILITY_CFLAGS) \
-	$(MSVC2013_COMPAT_CFLAGS)
-AM_CXXFLAGS = \
-	$(LLVM_CFLAGS) \
-	$(VISIBILITY_CXXFLAGS) \
-	$(MSVC2013_COMPAT_CXXFLAGS)
 
 ARCH_LIBS =
 

src/util/Makefile.am

@@ -34,8 +34,7 @@ libmesautil_la_CPPFLAGS = \
 	-I$(top_srcdir)/src/gallium/include \
 	-I$(top_srcdir)/src/gallium/auxiliary \
 	$(SHA1_CFLAGS) \
-	$(VISIBILITY_CFLAGS) \
+	$(VISIBILITY_CFLAGS)
-	$(MSVC2008_COMPAT_CFLAGS)
 
 libmesautil_la_SOURCES = \
 	$(MESA_UTIL_FILES) \