Hello,

I am trying to use Emacs as an IDE in my Linux kernel development
projects. So I installed CEDET and GNU Global (gtags) with no
problems.

When I open a C source code belonging to my Linux kernel source
folder, the linux project is detected automatically. Functions,
variables, headers and other keywords are highlighted correctly.

Through the ~/.emacs file I configured semantic's code completion and
intellisense. So when I press C-<SPC> the code completion menu appears
and I can choose what's needed.

The issue is when I use preprocessor defines, the intellisense system
shows the menu on the current location but doesn't detect the right
things when invoked (C-<SPC>). Even I close and restart emacs the same
behavior is reproduced.

The test code is:

//----------------------------------------------------------------------------------------

typedef struct
{
        int p1;

       #ifdef __KERNEL__

           int p2;

       #endif

       #ifdef USE1

            char p3;

         #endif

#ifdef __LINUX_ARM_ARCH__

  int p4;

#endif

}OBJ;

OBJ g_obj;

//----------------------------------------------------------------------------------------

__KERNEL__ , USE1 and __LINUX_ARM_ARCH__ are already defined as
follows:

__KERNEL__ : (add-to-list 'semantic-lex-c-preprocessor-symbol-map
'("__KERNEL__" . "")) in .emacs
USE1 : defined in a header file included by the current C source file.
__LINUX_ARM_ARCH__ : (add-to-list 'semantic-lex-c-preprocessor-symbol-
file "/home/abdellatif/kernel/include/generated/autoconf.h") in .emacs

In the .emacs file I also added all the needed includes and defines
required by GCC cross compiler (GCC for ARM) to build the kernel
project.

I also tried to force semantic to use GCC cross compiler command line
in place of the system GCC to preprocess correctly but haven't found
how to do that.


The .emacs file, the output of the "M-x semantic-c-describe-
environment" command and the software versions are shown below.

Any help or indication is welcomed :)
Best regards

############# Software versions #############

- Emacs (23.2.1)
- Ubuntu machine (natty, 11.04)
- Cedet 1.0 (from http://cedet.sourceforge.net/)

############# .emacs #############

;load CEDET

(load-file "~/Documents/my_emacs/cedet-1.0/common/cedet.el")

(require 'ede)

(global-ede-mode t)

; turn on which-func support (plus all other code helpers)
(semantic-load-enable-gaudy-code-helpers)
(semantic-load-enable-excessive-code-helpers)

; turn on all "useful" features
(setq semantic-load-turn-useful-things-on t)

(setq-mode-local c-mode
                semanticdb-find-default-throttle
                '(project unloaded system recursive))


;init names completion, and displaying of information for tags &
classes
(require 'semantic-ia)



;preprocessing of source code

(require 'semantic-c)

(semantic-reset-system-include 'c-mode)
(semantic-reset-system-include 'c++-mode)
(semantic-add-system-include "/home/abdellatif/toolchain/arm-
eabi-4.4.3/lib/gcc/arm-eabi/4.4.3/include" 'c-mode)
(semantic-add-system-include "/home/abdellatif/kernel/arch/arm/
include" 'c-mode)
(semantic-add-system-include "/home/abdellatif/kernel/include" 'c-
mode)
(semantic-add-system-include "/home/abdellatif/kernel/arch/arm/mach-
omap2/include" 'c-mode)
(semantic-add-system-include "/home/abdellatif/kernel/arch/arm/plat-
omap/include" 'c-mode)
(add-to-list 'semantic-lex-c-preprocessor-symbol-file "/home/
abdellatif/kernel/include/generated/autoconf.h")
(add-to-list 'semantic-lex-c-preprocessor-symbol-map '("__KERNEL__" .
""))
(add-to-list 'semantic-lex-c-preprocessor-symbol-map
'("__LINUX_ARM_ARCH__" . "7"))
(add-to-list 'semantic-lex-c-preprocessor-symbol-map
'("KBUILD_STR(s)" . "#s"))
(add-to-list 'semantic-lex-c-preprocessor-symbol-map
'("KBUILD_BASENAME" . "KBUILD_STR(main)"))
(add-to-list 'semantic-lex-c-preprocessor-symbol-map
'("KBUILD_MODNAME" . "KBUILD_STR(main)"))


;semantic integration with imenu (display of a menu with a list of
functions, variables, and other tags)
(defun my-semantic-hook ()
 (imenu-add-to-menubar "TAGS"))
(add-hook 'semantic-init-hooks 'my-semantic-hook)

;names completion (semantic commands)
(defun my-cedet-hook ()
 (local-set-key [(control return)] 'semantic-ia-complete-symbol)
 (local-set-key "\C-x " 'semantic-ia-complete-symbol-menu)
  (local-set-key "\C-x\r" 'gtags-find-tag-from-here))
(add-hook 'c-mode-common-hook 'my-cedet-hook)

;navigating in source code
(semantic-mru-bookmark-mode 1)


;tell semantic to store its tags database between sessions here
(require 'semanticdb)
(setq-default semanticdb-default-save-directory "~/.semantic.cache")
(setq-default semanticdb-default-system-save-directory
"~/.semantic.cache")

;allow Semanticdb use databases generated by global(gtags)
(require 'semanticdb-global)
(semanticdb-enable-gnu-global-databases 'c-mode)

############# semantic-c-describe-environment #############

Calculated GCC Parameters:
 version = 4.5.2
 --target = i686-linux-gnu
 --host = i686-linux-gnu
 --build = i686-linux-gnu
 --enable-checking = release
 --with-tune = generic
 --with-arch-32 = i686
 --disable-werror = nil
 --enable-targets = all
 --enable-objc-gc = nil
 --with-plugin-ld = ld.gold
 --enable-ld = default
 --enable-gold = nil
 --enable-plugin = nil
 --enable-libstdcxx-time = yes
 --enable-libstdcxx-debug = nil
 --enable-clocale = gnu
 --with-sysroot = /
 --enable-nls = nil
 --libdir = /usr/lib/i386-linux-gnu
 --with-gxx-include-dir = /usr/include/c++/4.5
 --enable-threads = posix
 --without-included-gettext = nil
 --libexecdir = /usr/lib/i386-linux-gnu
 --with-system-zlib = nil
 --enable-linker-build-id = nil
 --with-multiarch-defaults = i386-linux-gnu
 --enable-multiarch = nil
 --enable-shared = nil
 --program-suffix = -4.5
 --prefix = /usr
 --enable-languages = c,c++,fortran,objc,obj-c++
 --with-bugurl = file:///usr/share/doc/gcc-4.5/README.Bugs
 4.5.2-8ubuntu4' = nil
 --with-pkgversion = 'Ubuntu/Linaro
 -v = nil
 target = i686-linux-gnu

Include Path Summary:

 This file's system include path is:
   /home/abdellatif/toolchain/arm-eabi-4.4.3/lib/gcc/arm-eabi/4.4.3/
include/
   /home/abdellatif/kernel/arch/arm/include/
   /home/abdellatif/kernel/include/
   /home/abdellatif/kernel/arch/arm/mach-omap2/include/
   /home/abdellatif/kernel/arch/arm/plat-omap/include/


Macro Summary:

 Your CPP table is primed from these files:
   /home/abdellatif/kernel/include/generated/autoconf.h
   in table: #<semanticdb-table autoconf.h (652 tags)>
   /usr/include/c++/4.5/i686-linux-gnu/bits/c++config.h
   in table: #<semanticdb-table c++config.h (193 tags)>

 Built-in symbol map:
   __THROW =
   __const = const
   __restrict =
   __declspec = ((spp-arg-list (foo) 1 . 2))
   __attribute__ = ((spp-arg-list (foo) 1 . 2))

 User symbol map:
   KBUILD_MODNAME = KBUILD_STR(main)
   KBUILD_BASENAME = KBUILD_STR(main)
   KBUILD_STR(s) = #s
   __LINUX_ARM_ARCH__ = 7
   __KERNEL__ =
   __DBL_MIN_EXP__ = (-1021)
   __pentiumpro__ = 1
   __UINT_LEAST16_MAX__ = 65535
   __FLT_MIN__ = 1.17549435082228750797e-38F
   __CHAR_BIT__ = 8
   __UINT8_MAX__ = 255
   __WINT_MAX__ = 4294967295U
   __SIZE_MAX__ = 4294967295U
   __WCHAR_MAX__ = 2147483647
   __GCC_HAVE_SYNC_COMPARE_AND_SWAP_1 = 1
   __GCC_HAVE_SYNC_COMPARE_AND_SWAP_2 = 1
   __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4 = 1
   __DBL_DENORM_MIN__ = ((double)4.94065645841246544177e-324L)
   __GCC_HAVE_SYNC_COMPARE_AND_SWAP_8 = 1
   __FLT_EVAL_METHOD__ = 2
   __unix__ = 1
   __UINT_FAST64_MAX__ = 18446744073709551615ULL
   __SIG_ATOMIC_TYPE__ = int
   __DBL_MIN_10_EXP__ = (-307)
   __FINITE_MATH_ONLY__ = 0
   __GNUC_PATCHLEVEL__ = 2
   __UINT_FAST8_MAX__ = 255
   __DEC64_MAX_EXP__ = 385
   __INT8_C(c) = c
   __UINT_LEAST64_MAX__ = 18446744073709551615ULL
   __SHRT_MAX__ = 32767
   __LDBL_MAX__ = 1.18973149535723176502e+4932L
   __UINT_LEAST8_MAX__ = 255
   __linux = 1
   __DEC32_EPSILON__ = 1E-6DF
   __unix = 1
   __UINT32_MAX__ = 4294967295U
   __LDBL_MAX_EXP__ = 16384
   __WINT_MIN__ = 0U
   __linux__ = 1
   __SCHAR_MAX__ = 127
   __DBL_DIG__ = 15
   _FORTIFY_SOURCE = 2
   __SIZEOF_INT__ = 4
   __SIZEOF_POINTER__ = 4
   __STDC_HOSTED__ = 1
   __LDBL_HAS_INFINITY__ = 1
   __FLT_EPSILON__ = 1.19209289550781250000e-7F
   __GXX_WEAK__ = 1
   __LDBL_MIN__ = 3.36210314311209350626e-4932L
   __DEC32_MAX__ = 9.999999E96DF
   __INT32_MAX__ = 2147483647
   __SIZEOF_LONG__ = 4
   __UINT16_C(c) = c
   __DECIMAL_DIG__ = 21
   __gnu_linux__ = 1
   __LDBL_HAS_QUIET_NAN__ = 1
   __GNUC__ = 4
   __GXX_RTTI = 1
   __FLT_HAS_DENORM__ = 1
   __SIZEOF_LONG_DOUBLE__ = 12
   __BIGGEST_ALIGNMENT__ = 16
   __i686 = 1
   __DBL_MAX__ = ((double)1.79769313486231570815e+308L)
   __INT_FAST32_MAX__ = 2147483647
   __DBL_HAS_INFINITY__ = 1
   __INT64_MAX__ = 9223372036854775807LL
   __DEC32_MIN_EXP__ = (-94)
   __INT_FAST16_TYPE__ = int
   __LDBL_HAS_DENORM__ = 1
   __cplusplus = 1
   __DEC128_MAX__ = 9.999999999999999999999999999999999E6144DL
   __INT_LEAST32_MAX__ = 2147483647
   __DEC32_MIN__ = 1E-95DF
   __DEPRECATED = 1
   __DBL_MAX_EXP__ = 1024
   __DEC128_EPSILON__ = 1E-33DL
   __PTRDIFF_MAX__ = 2147483647
   __GNUG__ = 4
   __LONG_LONG_MAX__ = 9223372036854775807LL
   __SIZEOF_SIZE_T__ = 4
   __SIZEOF_WINT_T__ = 4
   __GCC_HAVE_DWARF2_CFI_ASM = 1
   __GXX_ABI_VERSION = 1002
   __FLT_MIN_EXP__ = (-125)
   __i686__ = 1
   __DBL_MIN__ = ((double)2.22507385850720138309e-308L)
   __FLT_MIN_10_EXP__ = (-37)
   __DECIMAL_BID_FORMAT__ = 1
   __DEC128_MIN__ = 1E-6143DL
   __UINT16_MAX__ = 65535
   __DBL_HAS_DENORM__ = 1
   __NO_INLINE__ = 1
   __i386 = 1
   __FLT_MANT_DIG__ = 24
   __VERSION__ = "4.5.2"
   __INT32_C(c) = c
   __DEC64_EPSILON__ = 1E-15DD
   __DEC128_MIN_EXP__ = (-6142)
   __INT_FAST32_TYPE__ = int
   unix = 1
   __INT16_MAX__ = 32767
   __i386__ = 1
   __UINT64_MAX__ = 18446744073709551615ULL
   __ELF__ = 1
   __FLT_RADIX__ = 2
   __LDBL_EPSILON__ = 1.08420217248550443401e-19L
   __SIG_ATOMIC_MAX__ = 2147483647
   __SIZEOF_PTRDIFF_T__ = 4
   __DEC32_SUBNORMAL_MIN__ = 0.000001E-95DF
   __pentiumpro = 1
   __INT_FAST16_MAX__ = 2147483647
   __UINT_FAST32_MAX__ = 4294967295U
   __FLT_HAS_QUIET_NAN__ = 1
   __FLT_MAX_10_EXP__ = 38
   __LONG_MAX__ = 2147483647L
   __DEC128_SUBNORMAL_MIN__ =
0.000000000000000000000000000000001E-6143DL
   __FLT_HAS_INFINITY__ = 1
   __DEC64_MAX__ = 9.999999999999999E384DD
   __PRAGMA_REDEFINE_EXTNAME = 1
   __INT_LEAST16_MAX__ = 32767
   __DEC64_MANT_DIG__ = 16
   __UINT_LEAST32_MAX__ = 4294967295U
   __DEC32_MAX_EXP__ = 97
   __INT_FAST8_MAX__ = 127
   __INTPTR_MAX__ = 2147483647
   linux = 1
   __EXCEPTIONS = 1
   __LDBL_MANT_DIG__ = 64
   __DBL_HAS_QUIET_NAN__ = 1
   __INTPTR_TYPE__ = int
   __WCHAR_TYPE__ = int
   __SIZEOF_FLOAT__ = 4
   __UINTPTR_MAX__ = 4294967295U
   __DEC64_MIN_EXP__ = (-382)
   __INT_FAST64_MAX__ = 9223372036854775807LL
   __FLT_DIG__ = 6
   __INT_MAX__ = 2147483647
   __FLT_MAX_EXP__ = 128
   __DBL_MANT_DIG__ = 53
   __INT_LEAST64_MAX__ = 9223372036854775807LL
   __DEC64_MIN__ = 1E-383DD
   __SIZEOF_SHORT__ = 2
   __LDBL_MIN_EXP__ = (-16381)
   __INT_LEAST8_MAX__ = 127
   __SSP__ = 1
   __LDBL_MAX_10_EXP__ = 4932
   __DBL_EPSILON__ = ((double)2.22044604925031308085e-16L)
   __UINT8_C(c) = c
   __INT_LEAST32_TYPE__ = int
   __SIZEOF_WCHAR_T__ = 4
   __DEC_EVAL_METHOD__ = 2
   __INTMAX_MAX__ = 9223372036854775807LL
   __FLT_DENORM_MIN__ = 1.40129846432481707092e-45F
   __INT8_MAX__ = 127
   __FLT_MAX__ = 3.40282346638528859812e+38F
   __INT32_TYPE__ = int
   __SIZEOF_DOUBLE__ = 8
   i386 = 1
   __DEC128_MAX_EXP__ = 6145
   __GNUC_MINOR__ = 5
   __UINTMAX_MAX__ = 18446744073709551615ULL
   __DEC32_MANT_DIG__ = 7
   __DBL_MAX_10_EXP__ = 308
   __LDBL_DENORM_MIN__ = 3.64519953188247460253e-4951L
   __INT16_C(c) = c
   __STDC__ = 1
   __PTRDIFF_TYPE__ = int
   __DEC64_SUBNORMAL_MIN__ = 0.000000000000001E-383DD
   __DEC128_MANT_DIG__ = 34
   __LDBL_MIN_10_EXP__ = (-4931)
   __SIZEOF_LONG_LONG__ = 8
   __LDBL_DIG__ = 18
   __UINT_FAST16_MAX__ = 4294967295U
   __GNUC_GNU_INLINE__ = 1
   _GNU_SOURCE = 1



--
Abdellatif El Khlifi
abdellatif@ieee.org
http://abdellatif.emurse.com/