Fix patch supplied at end...
---
I have a problem (on Irix6.5, Solaris2.8, OSF1v5.1 and Linux) when I
include the use of --exec-prefix in the build (which allows a common
location for the man pages, info files and common c++ header files).
The problem is that the some of the directory locations used to
search for header files are nonsense.
I decided to see where "make install" actually installs the files and
see how to match that up with the Makefile.in setting of
PREPROCESSOR_DEFINES.
I've had a look at the way gcc is built. It builds (part of) the
pre-processor (cppdefault.c) by using a set of definitions passed in
fromn the Makefile, but these don't actually correspond to where "make
install" puts files when you specify a --exec-prefix which is not under
--prefix.
Even if you don't specify a --exec-prefix the pathnames used are
somewhat odd.
I've build gcc with and without using --exec-prefix with and without
my patch (see end).
For gcc compilations the include paths used do not change as a result
of this patch.
For g++ compilations the include paths change as follows:
A) Without using --exec-prefix:
/local/single/arch/lib/gcc/i686-pc-linux-gnu/3.4.3/../../../../include/c++/3.4.3
/local/single/arch/lib/gcc/i686-pc-linux-gnu/3.4.3/../../../../include/c++/3.4.3/i686-pc-linux-gnu
/local/single/arch/lib/gcc/i686-pc-linux-gnu/3.4.3/../../../../include/c++/3.4.3/backward
becomes:
/local/single/arch/include/c++/3.4.3
/local/single/arch/include/c++/3.4.3/i686-pc-linux-gnu
/local/single/arch/include/c++/3.4.3/backward
which are the same locations, but using a more sensible (direct) route.
B) With --exec-prefix set
When I use --exec-prefix to place it under a separate location to
--prefix (well, it's really the reverse...) then what was:
ignoring nonexistent directory
"/local/shared/arch/lib/gcc/i686-pc-linux-gnu/3.4.3/../../../../../../../include/c++/3.4.3"
ignoring nonexistent directory
"/local/shared/arch/lib/gcc/i686-pc-linux-gnu/3.4.3/../../../../../../../include/c++/3.4.3/i686-pc-linux-gnu"
ignoring nonexistent directory
"/local/shared/arch/lib/gcc/i686-pc-linux-gnu/3.4.3/../../../../../../../include/c++/3.4.3/backward"
becomes
/local/shared/common/include/c++/3.4.3
/local/shared/common/include/c++/3.4.3/i686-pc-linux-gnu
/local/shared/common/include/c++/3.4.3/backward
and things work as expected.
NOTE: that even with this patch installed the setting of
TOOL_INCLUDE_DIR still corresponds to a non-existent directory.
I haven't tested this on any cross-compilation setup.
This does not change the setting of gcc_tooldir, which is equally
wrongly set, but it only seems to be used in cross-compilation.
The patch is a trivial change from using $(gcc_gxx_include_dir) to
using $(gxx_include_dir).
==========
--- gcc/Makefile.in.orig 2004-10-18 17:00:39.000000000 +0100
+++ gcc/Makefile.in 2005-03-14 10:55:15.000000000 +0000
@@ -2332,12 +2332,15 @@
#
# Remake cpp and protoize.
-
+# Fix to correspond to where make install puts things
+# (at least for standard buils with --prefix and
+# --exec-prefix + --prefix)
+#
PREPROCESSOR_DEFINES = \
-DGCC_INCLUDE_DIR=\"$(libsubdir)/include\" \
- -DGPLUSPLUS_INCLUDE_DIR=\"$(gcc_gxx_include_dir)\" \
-
-DGPLUSPLUS_TOOL_INCLUDE_DIR=\"$(gcc_gxx_include_dir)/$(target_noncanonical)\" \
- -DGPLUSPLUS_BACKWARD_INCLUDE_DIR=\"$(gcc_gxx_include_dir)/backward\" \
+ -DGPLUSPLUS_INCLUDE_DIR=\"$(gxx_include_dir)\" \
+ -DGPLUSPLUS_TOOL_INCLUDE_DIR=\"$(gxx_include_dir)/$(target_noncanonical)\" \
+ -DGPLUSPLUS_BACKWARD_INCLUDE_DIR=\"$(gxx_include_dir)/backward\" \
-DLOCAL_INCLUDE_DIR=\"$(local_includedir)\" \
-DCROSS_INCLUDE_DIR=\"$(CROSS_SYSTEM_HEADER_DIR)\" \
-DTOOL_INCLUDE_DIR=\"$(gcc_tooldir)/include\" \
--
Summary: Rre-processor header file search list wrong with --exec-
prefix
Product: gcc
Version: 3.4.3
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: preprocessor
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: gml4410 at ggr dot co dot uk
CC: gcc-bugs at gcc dot gnu dot org
GCC build triplet: ANY
GCC host triplet: ANY
GCC target triplet: ANY
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20472
