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Correct bug in the object file output code leading to stack corruption It turns out leaving a pointer to a stack allocated temporary in a persistent data structure is not conducive to correct program operation. Undo the export check setup in the object file output sequence so a pointer to stack allocated memory is not left hanging when the function returns. This seems to correct at least one mysterious crash bug, and possibly others. Thanks to Boisy Pitre for reporting the crash bug that led to this discovery, as well as a previous crash bug that likely has the same root cause. Additional thanks to Ciaran Anscomb whose debugger wielding wizardry revealed the exact location of this particular bit of unbrilliance.
author William Astle <lost@l-w.ca>
date Sat, 03 Aug 2024 14:30:06 -0600
parents b2ee86298516
children
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10
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1 # define anything system specific here
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2 #
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3 # set these variables if needed
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4 # PROGSUFFIX: suffix added to binaries
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5 # BUILDTPREFIX: prefix added to build utilities (cc, etc.) for xcompile
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6 # can also set them when invoking "make"
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7 #PROGSUFFIX := .exe
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8 #BUILDTPREFIX=i586-mingw32msvc-
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9
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10 ifeq ($(PREFIX),)
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11 ifneq ($(DESTDIR),)
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12 PREFIX = /usr
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13 else
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14 PREFIX = /usr/local
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15 endif
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16 endif
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17
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18 LIBDIR = $(PREFIX)/lib
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19 BINDIR = $(PREFIX)/bin
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20
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21 INSTALLDIR = $(DESTDIR)$(PREFIX)
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22 INSTALLBIN = $(DESTDIR)$(BINDIR)
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23 INSTALLLIB = $(DESTDIR)$(LIBDIR)
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24
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25 LWCC_LIBDIR = $(LIBDIR)/lwcc/$(PACKAGE_VERSION)
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26 LWCC_INSTALLLIBDIR = $(DESTDIR)$(LWCC_LIBDIR)
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27
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28 # this are probably pointless but they will make sure
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29 # the variables are set without overriding the environment
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30 # or automatic values from make itself.
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31 CC ?= cc
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32 AR ?= ar
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33 RANLIB ?= ranlib
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34
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35 # Set variables for cross compiling
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36 ifneq ($(BUILDTPREFIX),)
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37 CC := $(BUILDTPREFIX)$(CC)
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38 AR := $(BUILDTPREFIX)$(AR)
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39 RANLIB := $(BUILDTPREFIX)$(RANLIB)
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40 endif
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41
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42 CPPFLAGS += -I lwlib -Icommon
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43 CPPFLAGS += -DPREFIX=$(PREFIX) -DLWCC_LIBDIR=$(LWCC_LIBDIR)
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44 CPPFLAGS += -DPROGSUFFIX=$(PROGSUFFIX)
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45 LDFLAGS += -Llwlib -llw
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46
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47 # The format truncation warnings are bleeping stupid when applied to
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48 # snprintf() and friends. I'm using snprintf() precisely to prevent
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49 # overflows and I don't care if the string is truncated, so why should
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50 # I need to test the return value? Bleeping stupid.
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51
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52 # -O3 breaks the build on some compiler/system targets so default to
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53 # -O2 which seems okay for now. Ideally identifying what breaks at
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54 # -O3 is indicated, but so far, identifying the specific source of
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55 # the breakage has been problematic.
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56 CFLAGS ?= -O2 -Wno-char-subscripts -Wno-format-truncation
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58 MAIN_TARGETS := lwasm/lwasm$(PROGSUFFIX) \
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59 lwlink/lwlink$(PROGSUFFIX) \
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60 lwar/lwar$(PROGSUFFIX) \
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61 lwlink/lwobjdump$(PROGSUFFIX) \
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62 lwcc/lwcc-cpp$(PROGSUFFIX)
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63
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64 SECONDARY_TARGETS := lwcc/lwcc$(PROGSUFFIX) \
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65 lwcc/lwcc-cc$(PROGSUFFIX)
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66
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67 LWCC_LIBBIN_FILES = lwcc/lwcc-cpp$(PROGSUFFIX) lwcc/lwcc-cc$(PROGSUFFIX)
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68 LWCC_LIBLIB_FILES =
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69 LWCC_LIBINC_FILES =
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70
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71 .PHONY: default
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72 default: $(MAIN_TARGETS)
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73
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74 .PHONY: all
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75 all: $(MAIN_TARGETS) $(SECONDARY_TARGETS)
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76
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77 lwar_srcs := add.c extract.c list.c lwar.c main.c remove.c replace.c
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78 lwar_srcs := $(addprefix lwar/,$(lwar_srcs))
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79
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80 lwlib_srcs := lw_alloc.c lw_realloc.c lw_free.c lw_error.c lw_expr.c \
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81 lw_stack.c lw_string.c lw_stringlist.c lw_cmdline.c lw_strbuf.c \
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82 lw_strpool.c lw_dict.c
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83 lwlib_srcs := $(addprefix lwlib/,$(lwlib_srcs))
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84
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85 lwlink_srcs := main.c lwlink.c readfiles.c expr.c script.c link.c output.c map.c
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86 lwobjdump_srcs := objdump.c
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87 lwlink_srcs := $(addprefix lwlink/,$(lwlink_srcs))
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88 lwobjdump_srcs := $(addprefix lwlink/,$(lwobjdump_srcs))
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89
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90 lwasm_srcs := cycle.c debug.c input.c insn_bitbit.c insn_gen.c insn_indexed.c \
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91 insn_inh.c insn_logicmem.c insn_rel.c insn_rlist.c insn_rtor.c insn_tfm.c \
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92 instab.c list.c lwasm.c macro.c main.c os9.c output.c pass1.c pass2.c \
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93 pass3.c pass4.c pass5.c pass6.c pass7.c pragma.c pseudo.c section.c \
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94 strings.c struct.c symbol.c symdump.c unicorns.c
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95 lwasm_srcs := $(addprefix lwasm/,$(lwasm_srcs))
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96
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97 lwasm_objs := $(lwasm_srcs:.c=.o)
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98 lwlink_objs := $(lwlink_srcs:.c=.o)
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99 lwar_objs := $(lwar_srcs:.c=.o)
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100 lwlib_objs := $(lwlib_srcs:.c=.o)
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101 lwobjdump_objs := $(lwobjdump_srcs:.c=.o)
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102
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103 lwasm_deps := $(lwasm_srcs:.c=.d)
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104 lwlink_deps := $(lwlink_srcs:.c=.d)
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105 lwar_deps := $(lwar_srcs:.c=.d)
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106 lwlib_deps := $(lwlib_srcs:.c=.d)
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107 lwobjdump_deps := $(lwobjdump_srcs:.c=.d)
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108
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109 lwcc_driver_srcs := driver-main.c
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110 lwcc_driver_srcs := $(addprefix lwcc/,$(lwcc_driver_srcs))
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111 lwcc_driver_objs := $(lwcc_driver_srcs:.c=.o)
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112 lwcc_driver_deps := $(lwcc_driver_srcs:.c=.d)
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113
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114 lwcc_cpp_srcs := cpp-main.c
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115 lwcc_cpp_srcs := $(addprefix lwcc/,$(lwcc_cpp_srcs))
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116 lwcc_cpp_objs := $(lwcc_cpp_srcs:.c=.o)
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117 lwcc_cpp_deps := $(lwcc_cpp_srcs:.c=.d)
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118
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119 lwcc_cc_srcs := cc-main.c tree.c cc-parse.c cc-gencode.c
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120 lwcc_cc_srcs := $(addprefix lwcc/,$(lwcc_cc_srcs))
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121 lwcc_cc_objs := $(lwcc_cc_srcs:.c=.o)
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122 lwcc_cc_deps := $(lwcc_cc_srcs:.c=.d)
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123
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124 lwcc_cpplib_srcs := cpp.c lex.c token.c preproc.c symbol.c
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125 lwcc_cpplib_srcs := $(addprefix lwcc/,$(lwcc_cpplib_srcs))
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126 lwcc_cpplib_objs := $(lwcc_cpplib_srcs:.c=.o)
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127 lwcc_cpplib_deps := $(lwcc_cpplib_srcs:.c=.d)
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128
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129 lwcc_deps := $(lwcc_cpp_deps) $(lwcc_driver_deps) $(lwcc_cpplib_deps) $(lwcc_cc_deps)
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130
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131 .PHONY: lwlink lwasm lwar lwobjdump lwcc
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132 lwlink: lwlink/lwlink$(PROGSUFFIX)
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133 lwasm: lwasm/lwasm$(PROGSUFFIX)
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134 lwar: lwar/lwar$(PROGSUFFIX)
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135 lwobjdump: lwlink/lwobjdump$(PROGSUFFIX)
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136 lwcc: lwcc/lwcc$(PROGSUFFIX)
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137 lwcc-cpp: lwcc/lwcc-cpp$(PROGSUFFIX)
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138 lwcc-cpplib: lwcc/libcpp.a
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139
189
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140 lwasm/lwasm$(PROGSUFFIX): $(lwasm_objs) lwlib
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141 @echo Linking $@
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142 @$(CC) -o $@ $(lwasm_objs) $(LDFLAGS)
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143
189
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144 lwlink/lwlink$(PROGSUFFIX): $(lwlink_objs) lwlib
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145 @echo Linking $@
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146 @$(CC) -o $@ $(lwlink_objs) $(LDFLAGS)
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147
189
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148 lwlink/lwobjdump$(PROGSUFFIX): $(lwobjdump_objs) lwlib
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149 @echo Linking $@
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150 @$(CC) -o $@ $(lwobjdump_objs) $(LDFLAGS)
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151
189
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152 lwar/lwar$(PROGSUFFIX): $(lwar_objs) lwlib
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153 @echo Linking $@
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154 @$(CC) -o $@ $(lwar_objs) $(LDFLAGS)
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155
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156 lwcc/lwcc$(PROGSUFFIX): $(lwcc_driver_objs) lwlib
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157 @echo Linking $@
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158 @$(CC) -o $@ $(lwcc_driver_objs) $(LDFLAGS)
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159
308
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160 lwcc/lwcc-cpp$(PROGSUFFIX): $(lwcc_cpp_objs) lwlib lwcc-cpplib
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161 @echo Linking $@
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162 @$(CC) -o $@ $(lwcc_cpp_objs) lwcc/libcpp.a $(LDFLAGS)
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163
311
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164 lwcc/lwcc-cc$(PROGSUFFIX): $(lwcc_cc_objs) lwlib lwcc-cpplib
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165 @echo Linking $@
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166 @$(CC) -o $@ $(lwcc_cc_objs) lwcc/libcpp.a $(LDFLAGS)
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167
308
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168 .INTERMEDIATE: lwcc-cpplib
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169 lwcc-cpplib: lwcc/libcpp.a
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170 lwcc/libcpp.a: $(lwcc_cpplib_objs)
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171 @echo Linking $@
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172 @$(AR) rc $@ $(lwcc_cpplib_objs)
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173 @$(RANLIB) $@
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174
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175 #.PHONY: lwlib
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176 .INTERMEDIATE: lwlib
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177 lwlib: lwlib/liblw.a
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178
190
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179 lwlib/liblw.a: $(lwlib_objs)
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180 @echo Linking $@
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181 @$(AR) rc $@ $(lwlib_objs)
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182 @$(RANLIB) $@
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183
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184 alldeps := $(lwasm_deps) $(lwlink_deps) $(lwar_deps) $(lwlib_deps) ($lwobjdump_deps) $(lwcc_deps)
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185
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186 -include $(alldeps)
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187
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188 extra_clean := $(extra_clean) *~ */*~
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189
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190 %.o: %.c
181
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191 @echo "Building dependencies for $@"
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192 @$(CC) -MM $(CPPFLAGS) -o $*.d $<
181
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193 @mv -f $*.d $*.d.tmp
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194 @sed -e 's|.*:|$*.o $*.d:|' < $*.d.tmp > $*.d
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195 @sed -e 's/.*://' -e 's/\\$$//' < $*.d.tmp | fmt -1 | sed -e 's/^ *//' -e 's/$$/:/' >> $*.d
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196 @rm -f $*.d.tmp
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197 @echo Building $@
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198 @$(CC) $(CPPFLAGS) $(CFLAGS) -o $@ -c $<
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199
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200
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201 .PHONY: clean
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202 clean: $(cleantargs)
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203 @echo "Cleaning up"
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204 @rm -f lwlib/liblw.a lwasm/lwasm$(PROGSUFFIX) lwlink/lwlink$(PROGSUFFIX) lwlink/lwobjdump$(PROGSUFFIX) lwar/lwar$(PROGSUFFIX)
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205 @rm -f lwcc/lwcc$(PROGSUFFIX) lwcc/lwcc-cpp$(PROGSUFFIX) lwcc/lwcc-cc$(PROGSUFFIX) lwcc/libcpp.a
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206 @rm -f $(lwcc_driver_objs) $(lwcc_cpp_objs) $(lwcc_cpplib_objs) $(lwcc_cc_objs)
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207 @rm -f $(lwasm_objs) $(lwlink_objs) $(lwar_objs) $(lwlib_objs) $(lwobjdump_objs)
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208 @rm -f $(extra_clean)
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209 @rm -f */*.exe
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210
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211 .PHONY: realclean
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212 realclean: clean $(realcleantargs)
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213 @echo "Cleaning up even more"
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214 @rm -f $(lwasm_deps) $(lwlink_deps) $(lwar_deps) $(lwlib_deps) $(lwobjdump_deps)
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215 @rm -f $(lwcc_driver_deps) $(lwcc_cpp_deps) $(lwcc_cpplib_deps) $(lwcc_cc_deps)
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216
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217 print-%:
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218 @echo $* = $($*)
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219
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220 .PHONY: install
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221 install: $(MAIN_TARGETS)
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222 install -d $(INSTALLDIR)
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223 install -d $(INSTALLBIN)
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224 install $(MAIN_TARGETS) $(INSTALLBIN)
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225
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226 .PHONY: install-all
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227 install-all: install
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228 install $(SECONDARY_TARGETS) $(INSTALLBIN)
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229 install -d $(LWCC_INSTALLLIBDIR)
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230 install -d $(LWCC_INSTALLLIBDIR)/bin
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231 install -d $(LWCC_INSTALLLIBDIR)/lib
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232 install -d $(LWCC_INSTALLLIBDIR)/include
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233 ifneq ($(LWCC_LIBBIN_FILES),)
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234 install $(LWCC_LIBBIN_FILES) $(LWCC_INSTALLLIBDIR)/bin
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235 endif
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236 ifneq ($(LWCC_LIBLIB_FILES),)
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237 install $(LWCC_LIBLIB_FILES) $(LWCC_INSTALLLIBDIR)/lib
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238 endif
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239 ifneq ($(LWCC_LIBINC_FILES),)
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240 install $(LWCC_LIBINC_FILES) $(LWCC_INSTALLLIBDIR)/include
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241 endif
173
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242
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243 .PHONY: test
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244 test: all test/runtests
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245 @test/runtests
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246