[PATCH] Deprecate in-source autoconf builds

[Nick Lewycky]

Jonathan Roelofs wrote:
> Hi echristo, nlewycky,
>
> (CC-ing cfe-commits even though this is an LLVM patch... it affects both projects)
>
> This is a followup from: http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20150323/268067.html
>
> Upgrade instructions:
> ```
> $ mv llvm/include/llvm/Config/config.h ./config.h.BACKUP
>
> # copy the configure line from line 7 of llvm/config.log (for example: `$ ./configure --no-create --no-recursion`
>
> $ mkdir build
> $ cd build
>
> # run the configure line, but this time with '../llvm' at the beginning:
>
> $ ../llvm/configure --no-create --no-recursion
> ```

Thanks for doing this! The patch LGTM. Eric?

>
> http://reviews.llvm.org/D9351
>
> Files:
>    Makefile.config.in
>    autoconf/configure.ac
>    configure
>
> Index: Makefile.config.in
> ===================================================================
> --- Makefile.config.in
> +++ Makefile.config.in
> @@ -58,6 +58,22 @@
>   PROJ_SRC_ROOT   := $(LLVM_SRC_ROOT)
>   PROJ_SRC_DIR    := $(LLVM_SRC_ROOT)$(patsubst $(PROJ_OBJ_ROOT)%,%,$(PROJ_OBJ_DIR))
>
> +# FIXME: This is temporary during the grace period where in-source builds are
> +# deprecated. Convert to a hard error when that period is up.
> +#
> +# See: http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20150323/268067.html
> +ifeq ($(LLVM_SRC_ROOT), $(LLVM_OBJ_ROOT))
> +  $(warning ######################################################################################)
> +  $(warning #                                                                                    #)
> +  $(warning #                                   WARNING                                          #)
> +  $(warning #                                                                                    #)
> +  $(warning #                        In-source builds are deprecated.                            #)
> +  $(warning #                                                                                    #)
> +  $(warning #               Please configure from a separate build directory!                    #)
> +  $(warning #                                                                                    #)
> +  $(warning ######################################################################################)
> +endif
> +
>   ifneq ($(CLANG_SRC_ROOT),)
>     CLANG_SRC_ROOT:= $(call realpath, $(CLANG_SRC_ROOT))
>     PROJ_SRC_DIR  := $(patsubst $(LLVM_SRC_ROOT)/tools/clang%,$(CLANG_SRC_ROOT)%,$(PROJ_SRC_DIR))
> Index: autoconf/configure.ac
> ===================================================================
> --- autoconf/configure.ac
> +++ autoconf/configure.ac
> @@ -73,6 +73,19 @@
>     fi
>   fi
>
> +dnl Quit if it is an in-source build
> +if test ${srcdir} == "." ; then
> +  AC_MSG_WARN([**************************************************************************************])
> +  AC_MSG_WARN([*                                                                                    *])
> +  AC_MSG_WARN([*                                   WARNING                                          *])
> +  AC_MSG_WARN([*                                                                                    *])
> +  AC_MSG_WARN([*                        In-source builds are deprecated.                            *])
> +  AC_MSG_WARN([*                                                                                    *])
> +  AC_MSG_WARN([*               Please configure from a separate build directory!                    *])
> +  AC_MSG_WARN([*                                                                                    *])
> +  AC_MSG_WARN([**************************************************************************************])
> +fi
> +
>   dnl Default to empty (i.e. assigning the null string to) CFLAGS and CXXFLAGS,
>   dnl instead of the autoconf default (for example, '-g -O2' for CC=gcc).
>   : ${CFLAGS=}
> Index: configure
> ===================================================================
> --- configure
> +++ configure
> @@ -2030,6 +2030,27 @@
>     fi
>   fi
>
> +if test ${srcdir} == "." ; then
> +  { echo "$as_me:$LINENO: WARNING: **************************************************************************************">&5
> +echo "$as_me: WARNING: **************************************************************************************">&2;}
> +  { echo "$as_me:$LINENO: WARNING: *                                                                                    *">&5
> +echo "$as_me: WARNING: *                                                                                    *">&2;}
> +  { echo "$as_me:$LINENO: WARNING: *                                   WARNING                                          *">&5
> +echo "$as_me: WARNING: *                                   WARNING                                          *">&2;}
> +  { echo "$as_me:$LINENO: WARNING: *                                                                                    *">&5
> +echo "$as_me: WARNING: *                                                                                    *">&2;}
> +  { echo "$as_me:$LINENO: WARNING: *                        In-source builds are deprecated.                            *">&5
> +echo "$as_me: WARNING: *                        In-source builds are deprecated.                            *">&2;}
> +  { echo "$as_me:$LINENO: WARNING: *                                                                                    *">&5
> +echo "$as_me: WARNING: *                                                                                    *">&2;}
> +  { echo "$as_me:$LINENO: WARNING: *               Please configure from a separate build directory!                    *">&5
> +echo "$as_me: WARNING: *               Please configure from a separate build directory!                    *">&2;}
> +  { echo "$as_me:$LINENO: WARNING: *                                                                                    *">&5
> +echo "$as_me: WARNING: *                                                                                    *">&2;}
> +  { echo "$as_me:$LINENO: WARNING: **************************************************************************************">&5
> +echo "$as_me: WARNING: **************************************************************************************">&2;}
> +fi
> +
>   : ${CFLAGS=}
>   : ${CXXFLAGS=}
>
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