Merge git://git.kernel.org/pub/scm/linux/kernel/git/steve/gfs2-2.6-fixes
[linux-2.6-block.git] / scripts / Makefile.modpost
CommitLineData
1da177e4
LT
1# ===========================================================================
2# Module versions
3# ===========================================================================
4#
5# Stage one of module building created the following:
6# a) The individual .o files used for the module
c30fe7f7 7# b) A <module>.o file which is the .o files above linked together
1da177e4
LT
8# c) A <module>.mod file in $(MODVERDIR)/, listing the name of the
9# the preliminary <module>.o file, plus all .o files
10
11# Stage 2 is handled by this file and does the following
12# 1) Find all modules from the files listed in $(MODVERDIR)/
13# 2) modpost is then used to
14# 3) create one <module>.mod.c file pr. module
15# 4) create one Module.symvers file with CRC for all exported symbols
b2e3e658 16# 4a) [CONFIG_MARKERS] create one Module.markers file listing defined markers
1da177e4
LT
17# 5) compile all <module>.mod.c files
18# 6) final link of the module to a <module.ko> file
19
20# Step 3 is used to place certain information in the module's ELF
21# section, including information such as:
22# Version magic (see include/vermagic.h for full details)
23# - Kernel release
24# - SMP is CONFIG_SMP
25# - PREEMPT is CONFIG_PREEMPT
26# - GCC Version
27# Module info
28# - Module version (MODULE_VERSION)
29# - Module alias'es (MODULE_ALIAS)
30# - Module license (MODULE_LICENSE)
31# - See include/linux/module.h for more details
32
33# Step 4 is solely used to allow module versioning in external modules,
943ffb58 34# where the CRC of each module is retrieved from the Module.symers file.
1da177e4 35
ea837f1c
SR
36# KBUILD_MODPOST_WARN can be set to avoid error out in case of undefined
37# symbols in the final module linking stage
38# KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules.
39# This is solely usefull to speed up test compiles
4f193362 40PHONY := _modpost
1da177e4
LT
41_modpost: __modpost
42
c955ccaf 43include include/config/auto.conf
8ec4b4ff 44include scripts/Kbuild.include
0d96fb20 45
96d97f26 46# When building external modules load the Kbuild file to retreive EXTRA_SYMBOLS info
0d96fb20 47ifneq ($(KBUILD_EXTMOD),)
96d97f26
SR
48
49# set src + obj - they may be used when building the .mod.c file
50obj := $(KBUILD_EXTMOD)
51src := $(obj)
52
0d96fb20
RH
53# Include the module's Makefile to find KBUILD_EXTRA_SYMBOLS
54include $(if $(wildcard $(KBUILD_EXTMOD)/Kbuild), \
55 $(KBUILD_EXTMOD)/Kbuild, $(KBUILD_EXTMOD)/Makefile)
56endif
57
1da177e4
LT
58include scripts/Makefile.lib
59
040fcc81 60kernelsymfile := $(objtree)/Module.symvers
3f3fd3c0 61modulesymfile := $(firstword $(KBUILD_EXTMOD))/Module.symvers
b2e3e658
MD
62kernelmarkersfile := $(objtree)/Module.markers
63modulemarkersfile := $(firstword $(KBUILD_EXTMOD))/Module.markers
64
65markersfile = $(if $(KBUILD_EXTMOD),$(modulemarkersfile),$(kernelmarkersfile))
1da177e4
LT
66
67# Step 1), find all modules listed in $(MODVERDIR)/
68__modules := $(sort $(shell grep -h '\.ko' /dev/null $(wildcard $(MODVERDIR)/*.mod)))
69modules := $(patsubst %.o,%.ko, $(wildcard $(__modules:.ko=.o)))
70
ea837f1c
SR
71# Stop after building .o files if NOFINAL is set. Makes compile tests quicker
72_modpost: $(if $(KBUILD_MODPOST_NOFINAL), $(modules:.ko:.o),$(modules))
1da177e4 73
4ce6efed
SR
74ifneq ($(KBUILD_BUILDHOST),$(ARCH))
75 cross_build := 1
76endif
1da177e4
LT
77
78# Step 2), invoke modpost
79# Includes step 3,4
8d8d8289
SR
80modpost = scripts/mod/modpost \
81 $(if $(CONFIG_MODVERSIONS),-m) \
82 $(if $(CONFIG_MODULE_SRCVERSION_ALL),-a,) \
83 $(if $(KBUILD_EXTMOD),-i,-o) $(kernelsymfile) \
84 $(if $(KBUILD_EXTMOD),-I $(modulesymfile)) \
92f83cc5 85 $(if $(KBUILD_EXTRA_SYMBOLS), $(patsubst %, -e %,$(KBUILD_EXTRA_SYMBOLS))) \
8d8d8289 86 $(if $(KBUILD_EXTMOD),-o $(modulesymfile)) \
588ccd73 87 $(if $(CONFIG_DEBUG_SECTION_MISMATCH),,-S) \
b2e3e658
MD
88 $(if $(CONFIG_MARKERS),-K $(kernelmarkersfile)) \
89 $(if $(CONFIG_MARKERS),-M $(markersfile)) \
4ce6efed
SR
90 $(if $(KBUILD_EXTMOD)$(KBUILD_MODPOST_WARN),-w) \
91 $(if $(cross_build),-c)
8d8d8289 92
12715d20 93quiet_cmd_modpost = MODPOST $(words $(filter-out vmlinux FORCE, $^)) modules
8d8d8289 94 cmd_modpost = $(modpost) -s
1da177e4 95
4f193362 96PHONY += __modpost
12715d20 97__modpost: $(modules:.ko=.o) FORCE
85bd2fdd 98 $(call cmd,modpost) $(wildcard vmlinux) $(filter-out FORCE,$^)
1da177e4 99
12715d20 100quiet_cmd_kernel-mod = MODPOST $@
8d8d8289 101 cmd_kernel-mod = $(modpost) $@
12715d20 102
741f98fe 103vmlinux.o: FORCE
d35cb360 104 @rm -fr $(kernelmarkersfile)
12715d20
SR
105 $(call cmd,kernel-mod)
106
1da177e4
LT
107# Declare generated files as targets for modpost
108$(symverfile): __modpost ;
109$(modules:.ko=.mod.c): __modpost ;
110
b2e3e658
MD
111ifdef CONFIG_MARKERS
112$(markersfile): __modpost ;
113endif
114
1da177e4
LT
115
116# Step 5), compile all *.mod.c files
117
118# modname is set to make c_flags define KBUILD_MODNAME
5e8d780d 119modname = $(notdir $(@:.mod.o=))
1da177e4
LT
120
121quiet_cmd_cc_o_c = CC $@
122 cmd_cc_o_c = $(CC) $(c_flags) $(CFLAGS_MODULE) \
123 -c -o $@ $<
124
125$(modules:.ko=.mod.o): %.mod.o: %.mod.c FORCE
126 $(call if_changed_dep,cc_o_c)
127
128targets += $(modules:.ko=.mod.o)
129
130# Step 6), final link of the modules
131quiet_cmd_ld_ko_o = LD [M] $@
114f5157 132 cmd_ld_ko_o = $(LD) -r $(LDFLAGS) $(LDFLAGS_MODULE) -o $@ \
1da177e4
LT
133 $(filter-out FORCE,$^)
134
135$(modules): %.ko :%.o %.mod.o FORCE
136 $(call if_changed,ld_ko_o)
137
138targets += $(modules)
139
140
141# Add FORCE to the prequisites of a target to force it to be always rebuilt.
142# ---------------------------------------------------------------------------
143
4f193362 144PHONY += FORCE
1da177e4
LT
145
146FORCE:
147
148# Read all saved command lines and dependencies for the $(targets) we
149# may be building above, using $(if_changed{,_dep}). As an
150# optimization, we don't need to read them if the target does not
151# exist, we will rebuild anyway in that case.
152
153targets := $(wildcard $(sort $(targets)))
154cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
155
156ifneq ($(cmd_files),)
157 include $(cmd_files)
158endif
4f193362
PS
159
160
161# Declare the contents of the .PHONY variable as phony. We keep that
162# information in a variable se we can use it in if_changed and friends.
163
164.PHONY: $(PHONY)