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1 | # hints/dec_osf.sh |
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2 | |
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3 | # * If you want to debug perl or want to send a |
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4 | # stack trace for inclusion into an bug report, call |
5 | # Configure with the additional argument -Doptimize=-g2 |
6 | # or uncomment this assignment to "optimize": |
7 | # |
8 | #optimize=-g2 |
9 | # |
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10 | # If you want both to optimise and debug with the DEC cc |
11 | # you must have -g3, e.g. "-O4 -g3", and (re)run Configure. |
12 | # |
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13 | # * gcc can always have both -g and optimisation on. |
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14 | # |
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15 | # * debugging optimised code, no matter what compiler |
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16 | # one is using, can be surprising and confusing because of |
17 | # the optimisation tricks like code motion, code removal, |
18 | # loop unrolling, and inlining. The source code and the |
19 | # executable code simply do not agree any more while in |
20 | # mid-execution, the optimiser only cares about the results. |
21 | # |
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22 | # * Configure will automatically add the often quoted |
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23 | # -DDEBUGGING for you if the -g is specified. |
24 | # |
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25 | # * There is even more optimisation available in the new |
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26 | # (GEM) DEC cc: -O5 and -fast. "man cc" will tell more about them. |
27 | # The jury is still out whether either or neither help for Perl |
28 | # and how much. Based on very quick testing, -fast boosts |
29 | # raw data copy by about 5-15% (-fast brings in, among other |
30 | # things, inlined, ahem, fast memcpy()), while on the other |
31 | # hand searching things (index, m//, s///), seems to get slower. |
32 | # Your mileage will vary. |
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33 | # |
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34 | # * The -std is needed because the following compiled |
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35 | # without the -std and linked with -lm |
36 | # |
37 | # #include <math.h> |
38 | # #include <stdio.h> |
39 | # int main(){short x=10,y=sqrt(x);printf("%d\n",y);} |
40 | # |
41 | # will in Digital UNIX 3.* and 4.0b print 0 -- and in Digital |
42 | # UNIX 4.0{,a} dump core: Floating point exception in the printf(), |
43 | # the y has become a signaling NaN. |
44 | # |
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45 | # * Compilation warnings like: |
46 | # |
47 | # "Undefined the ANSI standard macro ..." |
48 | # |
49 | # can be ignored, at least while compiling the POSIX extension |
50 | # and especially if using the sfio (the latter is not a standard |
51 | # part of Perl, never mind if it says little to you). |
52 | # |
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53 | |
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54 | # If using the DEC compiler we must find out the DEC compiler style: |
55 | # the style changed between Digital UNIX (aka DEC OSF/1) 3 and |
56 | # Digital UNIX 4. The old compiler was originally from Ultrix and |
57 | # the MIPS company, the new compiler is originally from the VAX world |
58 | # and it is called GEM. Many of the options we are going to use depend |
59 | # on the compiler style. |
60 | |
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61 | # do NOT, I repeat, *NOT* take away those leading tabs |
62 | # reset |
63 | _DEC_uname_r= |
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64 | _DEC_cc_style= |
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65 | # set |
66 | _DEC_uname_r=`uname -r` |
67 | # _DEC_cc_style set soon below |
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68 | # Configure Black Magic (TM) |
69 | |
70 | case "$cc" in |
71 | *gcc*) ;; # pass |
72 | *) # compile something small: taint.c is fine for this. |
73 | # the main point is the '-v' flag of 'cc'. |
74 | case "`cc -v -I. -c taint.c -o /tmp/taint$$.o 2>&1`" in |
75 | */gemc_cc*) # we have the new DEC GEM CC |
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76 | _DEC_cc_style=new |
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77 | ;; |
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78 | *) # we have the old MIPS CC |
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79 | _DEC_cc_style=old |
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80 | ;; |
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81 | esac |
82 | # cleanup |
83 | rm -f /tmp/taint$$.o |
84 | ;; |
85 | esac |
86 | |
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87 | # be nauseatingly ANSI |
88 | case "$cc" in |
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89 | *gcc*) ccflags="$ccflags -ansi" |
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90 | ;; |
91 | *) ccflags="$ccflags -std" |
92 | ;; |
93 | esac |
94 | |
95 | # for gcc the Configure knows about the -fpic: |
96 | # position-independent code for dynamic loading |
97 | |
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98 | # we want optimisation |
99 | |
100 | case "$optimize" in |
101 | '') case "$cc" in |
102 | *gcc*) |
103 | optimize='-O3' ;; |
104 | *) case "$_DEC_cc_style" in |
105 | new) optimize='-O4' ;; |
106 | old) optimize='-O2 -Olimit 3200' ;; |
107 | esac |
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108 | ccflags="$ccflags -D_INTRINSICS" |
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109 | ;; |
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110 | esac |
111 | ;; |
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112 | esac |
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113 | |
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114 | # dlopen() is in libc |
115 | libswanted="`echo $libswanted | sed -e 's/ dl / /'`" |
116 | |
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117 | # libPW contains nothing useful for perl |
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118 | libswanted="`echo $libswanted | sed -e 's/ PW / /'`" |
119 | |
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120 | # libbsd contains nothing used by perl that is not already in libc |
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121 | libswanted="`echo $libswanted | sed -e 's/ bsd / /'`" |
122 | |
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123 | # libc need not be separately listed |
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124 | libswanted="`echo $libswanted | sed -e 's/ c / /'`" |
125 | |
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126 | # ndbm is already in libc |
127 | libswanted="`echo $libswanted | sed -e 's/ ndbm / /'`" |
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128 | |
129 | # the basic lddlflags used always |
130 | lddlflags='-shared -expect_unresolved "*"' |
131 | |
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132 | # Fancy compiler suites use optimising linker as well as compiler. |
133 | # <spider@Orb.Nashua.NH.US> |
134 | case "$_DEC_uname_r" in |
135 | *[123].*) # old loader |
136 | lddlflags="$lddlflags -O3" |
137 | ;; |
138 | *) lddlflags="$lddlflags $optimize -msym" |
139 | # -msym: If using a sufficiently recent /sbin/loader, |
140 | # keep the module symbols with the modules. |
141 | ;; |
142 | esac |
143 | # Yes, the above loses if gcc does not use the system linker. |
144 | # If that happens, let me know about it. <jhi@iki.fi> |
145 | |
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146 | |
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147 | # If debugging or (old systems and doing shared) |
148 | # then do not strip the lib, otherwise, strip. |
149 | # As noted above the -DDEBUGGING is added automagically by Configure if -g. |
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150 | case "$optimize" in |
151 | *-g*) ;; # left intentionally blank |
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152 | *) case "$_DEC_uname_r" in |
153 | *[123].*) |
154 | case "$useshrplib" in |
155 | false|undef|'') lddlflags="$lddlflags -s" ;; |
156 | esac |
157 | ;; |
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158 | *) lddlflags="$lddlflags -s" |
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159 | ;; |
160 | esac |
161 | ;; |
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162 | esac |
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163 | |
164 | # |
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165 | # Unset temporary variables no more needed. |
166 | # |
167 | |
168 | unset _DEC_cc_style |
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169 | unset _DEC_uname_r |
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170 | |
171 | # |
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172 | # History: |
173 | # |
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174 | # perl5.003_28: |
175 | # |
176 | # 22-Feb-1997 Jarkko Hietaniemi <jhi@iki.fi> |
177 | # |
178 | # * Restructuring Spider's suggestions. |
179 | # |
180 | # * Older Digital UNIXes cannot handle -Olimit ... for $lddlflags. |
181 | # |
182 | # * ld -s cannot be used in older Digital UNIXes when doing shared. |
183 | # |
184 | # |
185 | # 21-Feb-1997 Spider Boardman <spider@Orb.Nashua.NH.US> |
186 | # |
187 | # * -hidden removed. |
188 | # |
189 | # * -DSTANDARD_C removed. |
190 | # |
191 | # * -D_INTRINSICS added. (that -fast does not seem to buy much confirmed) |
192 | # |
193 | # * odbm not in libc, only ndbm. Therefore dbm back to $libswanted. |
194 | # |
195 | # * -msym for the newer runtime loaders. |
196 | # |
197 | # * $optimize also in $lddflags. |
198 | # |
199 | # |
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200 | # perl5.003_27: |
201 | # |
202 | # 18-Feb-1997 Jarkko Hietaniemi <jhi@iki.fi> |
203 | # |
204 | # * unset _DEC_cc_style and more commentary on -std. |
205 | # |
206 | # |
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207 | # perl5.003_26: |
208 | # |
209 | # 15-Feb-1997 Jarkko Hietaniemi <jhi@iki.fi> |
210 | # |
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211 | # * -std and -ansi. |
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212 | # |
213 | # |
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214 | # perl5.003_24: |
215 | # |
216 | # 30-Jan-1997 Jarkko Hietaniemi <jhi@iki.fi> |
217 | # |
218 | # * Fixing the note on -DDEBUGGING. |
219 | # |
220 | # * Note on -O5 -fast. |
221 | # |
222 | # |
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223 | # perl5.003_23: |
224 | # |
225 | # 26-Jan-1997 Jarkko Hietaniemi <jhi@iki.fi> |
226 | # |
227 | # * Notes on how to do both optimisation and debugging. |
228 | # |
229 | # |
230 | # 25-Jan-1997 Jarkko Hietaniemi <jhi@iki.fi> |
231 | # |
232 | # * Remove unneeded libraries from $libswanted: PW, bsd, c, dbm |
233 | # |
234 | # * Restructure the $lddlflags build. |
235 | # |
236 | # * $optimize based on which compiler we have. |
237 | # |
238 | # |
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239 | # perl5.003_22: |
240 | # |
241 | # 23-Jan-1997 Achim Bohnet <ach@rosat.mpe-garching.mpg.de> |
242 | # |
243 | # * Added comments 'how to create a debugging version of perl' |
244 | # |
245 | # * Fixed logic of this script to prevent stripping of shared |
246 | # objects by the loader (see ld man page for -s) is debugging |
247 | # is set via the -g switch. |
248 | # |
249 | # |
250 | # 21-Jan-1997 Achim Bohnet <ach@rosat.mpe-garching.mpg.de> |
251 | # |
252 | # * now 'dl' is always removed from libswanted. Not only if |
253 | # optimize is an empty string. |
254 | # |
255 | # |
256 | # 17-Jan-1997 Achim Bohnet <ach@rosat.mpe-garching.mpg.de> |
257 | # |
258 | # * Removed 'dl' from libswanted: When the FreePort binary |
259 | # translator for Sun binaries is installed Configure concludes |
260 | # that it should use libdl.x.yz.fpx.so :-( |
261 | # Because the dlopen, dlclose,... calls are in the |
262 | # C library it not necessary at all to check for the |
263 | # dl library. Therefore dl is removed from libswanted. |
264 | # |
265 | # |
266 | # 1-Jan-1997 Achim Bohnet <ach@rosat.mpe-garching.mpg.de> |
267 | # |
268 | # * Set -Olimit to 3200 because perl_yylex.c got too big |
269 | # for the optimizer. |
270 | # |