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comparison: build/autoconf/compiler-opts.m4
build/autoconf/compiler-opts.m4
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- TOR_BUG_9701
- changeset 3
- 141e0f1194b1
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| -1:000000000000 | 0:0da3372fcc13 |
|---|---|
| 1 dnl This Source Code Form is subject to the terms of the Mozilla Public | |
| 2 dnl License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 3 dnl file, You can obtain one at http://mozilla.org/MPL/2.0/. | |
| 4 | |
| 5 dnl Add compiler specific options | |
| 6 | |
| 7 AC_DEFUN([MOZ_DEFAULT_COMPILER], | |
| 8 [ | |
| 9 dnl set DEVELOPER_OPTIONS early; MOZ_DEFAULT_COMPILER is usually the first non-setup directive | |
| 10 if test -z "$MOZILLA_OFFICIAL"; then | |
| 11 DEVELOPER_OPTIONS=1 | |
| 12 fi | |
| 13 MOZ_ARG_ENABLE_BOOL(release, | |
| 14 [ --enable-release Build with more conservative, release engineering-oriented options. | |
| 15 This may slow down builds.], | |
| 16 DEVELOPER_OPTIONS=, | |
| 17 DEVELOPER_OPTIONS=1) | |
| 18 | |
| 19 AC_SUBST(DEVELOPER_OPTIONS) | |
| 20 | |
| 21 dnl Default to MSVC for win32 and gcc-4.2 for darwin | |
| 22 dnl ============================================================== | |
| 23 if test -z "$CROSS_COMPILE"; then | |
| 24 case "$target" in | |
| 25 *-mingw*) | |
| 26 if test -z "$CC"; then CC=cl; fi | |
| 27 if test -z "$CXX"; then CXX=cl; fi | |
| 28 if test -z "$CPP"; then CPP="cl -E -nologo"; fi | |
| 29 if test -z "$CXXCPP"; then CXXCPP="cl -TP -E -nologo"; ac_cv_prog_CXXCPP="$CXXCPP"; fi | |
| 30 if test -z "$LD"; then LD=link; fi | |
| 31 if test -z "$AS"; then | |
| 32 case "${target_cpu}" in | |
| 33 i*86) | |
| 34 AS=ml; | |
| 35 ;; | |
| 36 x86_64) | |
| 37 AS=ml64; | |
| 38 ;; | |
| 39 esac | |
| 40 fi | |
| 41 if test -z "$MIDL"; then MIDL=midl; fi | |
| 42 | |
| 43 # need override this flag since we don't use $(LDFLAGS) for this. | |
| 44 if test -z "$HOST_LDFLAGS" ; then | |
| 45 HOST_LDFLAGS=" " | |
| 46 fi | |
| 47 ;; | |
| 48 *-darwin*) | |
| 49 # GCC on darwin is based on gcc 4.2 and we don't support it anymore. | |
| 50 if test -z "$CC"; then | |
| 51 MOZ_PATH_PROGS(CC, clang) | |
| 52 fi | |
| 53 if test -z "$CXX"; then | |
| 54 MOZ_PATH_PROGS(CXX, clang++) | |
| 55 fi | |
| 56 IS_GCC=$($CC -v 2>&1 | grep gcc) | |
| 57 if test -n "$IS_GCC" | |
| 58 then | |
| 59 echo gcc is known to be broken on OS X, please use clang. | |
| 60 echo see http://developer.mozilla.org/en-US/docs/Developer_Guide/Build_Instructions/Mac_OS_X_Prerequisites | |
| 61 echo for more information. | |
| 62 exit 1 | |
| 63 fi | |
| 64 ;; | |
| 65 esac | |
| 66 fi | |
| 67 ]) | |
| 68 | |
| 69 dnl ============================================================================ | |
| 70 dnl C++ rtti | |
| 71 dnl We don't use it in the code, but it can be usefull for debugging, so give | |
| 72 dnl the user the option of enabling it. | |
| 73 dnl ============================================================================ | |
| 74 AC_DEFUN([MOZ_RTTI], | |
| 75 [ | |
| 76 MOZ_ARG_ENABLE_BOOL(cpp-rtti, | |
| 77 [ --enable-cpp-rtti Enable C++ RTTI ], | |
| 78 [ _MOZ_USE_RTTI=1 ], | |
| 79 [ _MOZ_USE_RTTI= ]) | |
| 80 | |
| 81 if test -z "$_MOZ_USE_RTTI"; then | |
| 82 if test "$GNU_CC"; then | |
| 83 CXXFLAGS="$CXXFLAGS -fno-rtti" | |
| 84 else | |
| 85 case "$target" in | |
| 86 *-mingw*) | |
| 87 CXXFLAGS="$CXXFLAGS -GR-" | |
| 88 esac | |
| 89 fi | |
| 90 fi | |
| 91 ]) | |
| 92 | |
| 93 dnl ======================================================== | |
| 94 dnl = | |
| 95 dnl = Debugging Options | |
| 96 dnl = | |
| 97 dnl ======================================================== | |
| 98 AC_DEFUN([MOZ_DEBUGGING_OPTS], | |
| 99 [ | |
| 100 dnl Debug info is ON by default. | |
| 101 if test -z "$MOZ_DEBUG_FLAGS"; then | |
| 102 if test -n "$_MSC_VER"; then | |
| 103 MOZ_DEBUG_FLAGS="-Zi" | |
| 104 else | |
| 105 MOZ_DEBUG_FLAGS="-g" | |
| 106 fi | |
| 107 fi | |
| 108 | |
| 109 AC_SUBST(MOZ_DEBUG_FLAGS) | |
| 110 | |
| 111 MOZ_ARG_ENABLE_STRING(debug, | |
| 112 [ --enable-debug[=DBG] Enable building with developer debug info | |
| 113 (using compiler flags DBG)], | |
| 114 [ if test "$enableval" != "no"; then | |
| 115 MOZ_DEBUG=1 | |
| 116 if test -n "$enableval" -a "$enableval" != "yes"; then | |
| 117 MOZ_DEBUG_FLAGS=`echo $enableval | sed -e 's|\\\ | |g'` | |
| 118 _MOZ_DEBUG_FLAGS_SET=1 | |
| 119 fi | |
| 120 else | |
| 121 MOZ_DEBUG= | |
| 122 fi ], | |
| 123 MOZ_DEBUG=) | |
| 124 | |
| 125 MOZ_DEBUG_ENABLE_DEFS="-DDEBUG -D_DEBUG -DTRACING" | |
| 126 MOZ_ARG_WITH_STRING(debug-label, | |
| 127 [ --with-debug-label=LABELS | |
| 128 Define DEBUG_<value> for each comma-separated | |
| 129 value given.], | |
| 130 [ for option in `echo $withval | sed 's/,/ /g'`; do | |
| 131 MOZ_DEBUG_ENABLE_DEFS="$MOZ_DEBUG_ENABLE_DEFS -DDEBUG_${option}" | |
| 132 done]) | |
| 133 | |
| 134 MOZ_DEBUG_DISABLE_DEFS="-DNDEBUG -DTRIMMED" | |
| 135 | |
| 136 if test -n "$MOZ_DEBUG"; then | |
| 137 AC_MSG_CHECKING([for valid debug flags]) | |
| 138 _SAVE_CFLAGS=$CFLAGS | |
| 139 CFLAGS="$CFLAGS $MOZ_DEBUG_FLAGS" | |
| 140 AC_TRY_COMPILE([#include <stdio.h>], | |
| 141 [printf("Hello World\n");], | |
| 142 _results=yes, | |
| 143 _results=no) | |
| 144 AC_MSG_RESULT([$_results]) | |
| 145 if test "$_results" = "no"; then | |
| 146 AC_MSG_ERROR([These compiler flags are invalid: $MOZ_DEBUG_FLAGS]) | |
| 147 fi | |
| 148 CFLAGS=$_SAVE_CFLAGS | |
| 149 fi | |
| 150 | |
| 151 dnl ======================================================== | |
| 152 dnl = Enable generation of debug symbols | |
| 153 dnl ======================================================== | |
| 154 MOZ_ARG_ENABLE_STRING(debug-symbols, | |
| 155 [ --enable-debug-symbols[=DBG] | |
| 156 Enable debugging symbols (using compiler flags DBG)], | |
| 157 [ if test "$enableval" != "no"; then | |
| 158 MOZ_DEBUG_SYMBOLS=1 | |
| 159 if test -n "$enableval" -a "$enableval" != "yes"; then | |
| 160 if test -z "$_MOZ_DEBUG_FLAGS_SET"; then | |
| 161 MOZ_DEBUG_FLAGS=`echo $enableval | sed -e 's|\\\ | |g'` | |
| 162 else | |
| 163 AC_MSG_ERROR([--enable-debug-symbols flags cannot be used with --enable-debug flags]) | |
| 164 fi | |
| 165 fi | |
| 166 else | |
| 167 MOZ_DEBUG_SYMBOLS= | |
| 168 fi ], | |
| 169 MOZ_DEBUG_SYMBOLS=1) | |
| 170 | |
| 171 if test -n "$MOZ_DEBUG" -o -n "$MOZ_DEBUG_SYMBOLS"; then | |
| 172 AC_DEFINE(MOZ_DEBUG_SYMBOLS) | |
| 173 export MOZ_DEBUG_SYMBOLS | |
| 174 fi | |
| 175 | |
| 176 ]) | |
| 177 | |
| 178 dnl A high level macro for selecting compiler options. | |
| 179 AC_DEFUN([MOZ_COMPILER_OPTS], | |
| 180 [ | |
| 181 if test "${MOZ_PSEUDO_DERECURSE-unset}" = unset; then | |
| 182 dnl Don't enable on pymake, because of bug 918652. Bug 912979 is an annoyance | |
| 183 dnl with pymake, too. | |
| 184 MOZ_PSEUDO_DERECURSE=no-pymake | |
| 185 fi | |
| 186 | |
| 187 MOZ_DEBUGGING_OPTS | |
| 188 MOZ_RTTI | |
| 189 if test "$CLANG_CXX"; then | |
| 190 ## We disable return-type-c-linkage because jsval is defined as a C++ type but is | |
| 191 ## returned by C functions. This is possible because we use knowledge about the ABI | |
| 192 ## to typedef it to a C type with the same layout when the headers are included | |
| 193 ## from C. | |
| 194 ## | |
| 195 ## mismatched-tags is disabled (bug 780474) mostly because it's useless. | |
| 196 ## Worse, it's not supported by gcc, so it will cause tryserver bustage | |
| 197 ## without any easy way for non-Clang users to check for it. | |
| 198 _WARNINGS_CXXFLAGS="${_WARNINGS_CXXFLAGS} -Wno-unknown-warning-option -Wno-return-type-c-linkage -Wno-mismatched-tags" | |
| 199 fi | |
| 200 | |
| 201 AC_MSG_CHECKING([whether the C++ compiler ($CXX $CXXFLAGS $LDFLAGS) actually is a C++ compiler]) | |
| 202 AC_LANG_SAVE | |
| 203 AC_LANG_CPLUSPLUS | |
| 204 _SAVE_LIBS=$LIBS | |
| 205 LIBS= | |
| 206 AC_TRY_LINK([#include <new>], [int *foo = new int;],, | |
| 207 AC_MSG_RESULT([no]) | |
| 208 AC_MSG_ERROR([$CXX $CXXFLAGS $LDFLAGS failed to compile and link a simple C++ source.])) | |
| 209 LIBS=$_SAVE_LIBS | |
| 210 AC_LANG_RESTORE | |
| 211 AC_MSG_RESULT([yes]) | |
| 212 | |
| 213 if test -z "$GNU_CC"; then | |
| 214 case "$target" in | |
| 215 *-mingw*) | |
| 216 ## Warning 4099 (equivalent of mismatched-tags) is disabled (bug 780474) | |
| 217 ## for the same reasons as above. | |
| 218 _WARNINGS_CXXFLAGS="${_WARNINGS_CXXFLAGS} -wd4099" | |
| 219 esac | |
| 220 fi | |
| 221 | |
| 222 if test -n "$DEVELOPER_OPTIONS"; then | |
| 223 MOZ_FORCE_GOLD=1 | |
| 224 fi | |
| 225 | |
| 226 MOZ_ARG_ENABLE_BOOL(gold, | |
| 227 [ --enable-gold Enable GNU Gold Linker when it is not already the default], | |
| 228 MOZ_FORCE_GOLD=1, | |
| 229 MOZ_FORCE_GOLD= | |
| 230 ) | |
| 231 | |
| 232 if test "$GNU_CC" -a -n "$MOZ_FORCE_GOLD"; then | |
| 233 dnl if the default linker is BFD ld, check if gold is available and try to use it | |
| 234 dnl for local builds only. | |
| 235 if $CC -Wl,--version 2>&1 | grep -q "GNU ld"; then | |
| 236 GOLD=$($CC -print-prog-name=ld.gold) | |
| 237 case "$GOLD" in | |
| 238 /*) | |
| 239 ;; | |
| 240 *) | |
| 241 GOLD=$(which $GOLD) | |
| 242 ;; | |
| 243 esac | |
| 244 if test -n "$GOLD"; then | |
| 245 mkdir -p $_objdir/build/unix/gold | |
| 246 rm -f $_objdir/build/unix/gold/ld | |
| 247 ln -s "$GOLD" $_objdir/build/unix/gold/ld | |
| 248 if $CC -B $_objdir/build/unix/gold -Wl,--version 2>&1 | grep -q "GNU gold"; then | |
| 249 LDFLAGS="$LDFLAGS -B $_objdir/build/unix/gold" | |
| 250 else | |
| 251 rm -rf $_objdir/build/unix/gold | |
| 252 fi | |
| 253 fi | |
| 254 fi | |
| 255 fi | |
| 256 | |
| 257 if test "$GNU_CC"; then | |
| 258 if test -z "$DEVELOPER_OPTIONS"; then | |
| 259 CFLAGS="$CFLAGS -ffunction-sections -fdata-sections" | |
| 260 CXXFLAGS="$CXXFLAGS -ffunction-sections -fdata-sections" | |
| 261 fi | |
| 262 CFLAGS="$CFLAGS -fno-math-errno" | |
| 263 CXXFLAGS="$CXXFLAGS -fno-exceptions -fno-math-errno" | |
| 264 fi | |
| 265 | |
| 266 dnl ======================================================== | |
| 267 dnl = Identical Code Folding | |
| 268 dnl ======================================================== | |
| 269 | |
| 270 MOZ_ARG_DISABLE_BOOL(icf, | |
| 271 [ --disable-icf Disable Identical Code Folding], | |
| 272 MOZ_DISABLE_ICF=1, | |
| 273 MOZ_DISABLE_ICF= ) | |
| 274 | |
| 275 if test "$GNU_CC" -a "$GCC_USE_GNU_LD" -a -z "$MOZ_DISABLE_ICF" -a -z "$DEVELOPER_OPTIONS"; then | |
| 276 AC_CACHE_CHECK([whether the linker supports Identical Code Folding], | |
| 277 LD_SUPPORTS_ICF, | |
| 278 [echo 'int foo() {return 42;}' \ | |
| 279 'int bar() {return 42;}' \ | |
| 280 'int main() {return foo() - bar();}' > conftest.${ac_ext} | |
| 281 # If the linker supports ICF, foo and bar symbols will have | |
| 282 # the same address | |
| 283 if AC_TRY_COMMAND([${CC-cc} -o conftest${ac_exeext} $LDFLAGS -Wl,--icf=safe -ffunction-sections conftest.${ac_ext} $LIBS 1>&2]) && | |
| 284 test -s conftest${ac_exeext} && | |
| 285 objdump -t conftest${ac_exeext} | awk changequote(<<, >>)'{a[<<$>>6] = <<$>>1} END {if (a["foo"] && (a["foo"] != a["bar"])) { exit 1 }}'changequote([, ]); then | |
| 286 LD_SUPPORTS_ICF=yes | |
| 287 else | |
| 288 LD_SUPPORTS_ICF=no | |
| 289 fi | |
| 290 rm -rf conftest*]) | |
| 291 if test "$LD_SUPPORTS_ICF" = yes; then | |
| 292 _SAVE_LDFLAGS="$LDFLAGS -Wl,--icf=safe" | |
| 293 LDFLAGS="$LDFLAGS -Wl,--icf=safe -Wl,--print-icf-sections" | |
| 294 AC_TRY_LINK([], [], | |
| 295 [LD_PRINT_ICF_SECTIONS=-Wl,--print-icf-sections], | |
| 296 [LD_PRINT_ICF_SECTIONS=]) | |
| 297 AC_SUBST([LD_PRINT_ICF_SECTIONS]) | |
| 298 LDFLAGS="$_SAVE_LDFLAGS" | |
| 299 fi | |
| 300 fi | |
| 301 | |
| 302 dnl ======================================================== | |
| 303 dnl = Automatically remove dead symbols | |
| 304 dnl ======================================================== | |
| 305 | |
| 306 if test "$GNU_CC" -a "$GCC_USE_GNU_LD" -a -z "$DEVELOPER_OPTIONS"; then | |
| 307 if test -n "$MOZ_DEBUG_FLAGS"; then | |
| 308 dnl See bug 670659 | |
| 309 AC_CACHE_CHECK([whether removing dead symbols breaks debugging], | |
| 310 GC_SECTIONS_BREAKS_DEBUG_RANGES, | |
| 311 [echo 'int foo() {return 42;}' \ | |
| 312 'int bar() {return 1;}' \ | |
| 313 'int main() {return foo();}' > conftest.${ac_ext} | |
| 314 if AC_TRY_COMMAND([${CC-cc} -o conftest.${ac_objext} $CFLAGS $MOZ_DEBUG_FLAGS -c conftest.${ac_ext} 1>&2]) && | |
| 315 AC_TRY_COMMAND([${CC-cc} -o conftest${ac_exeext} $LDFLAGS $MOZ_DEBUG_FLAGS -Wl,--gc-sections conftest.${ac_objext} $LIBS 1>&2]) && | |
| 316 test -s conftest${ac_exeext} -a -s conftest.${ac_objext}; then | |
| 317 if test "`$PYTHON -m mozbuild.configure.check_debug_ranges conftest.${ac_objext} conftest.${ac_ext}`" = \ | |
| 318 "`$PYTHON -m mozbuild.configure.check_debug_ranges conftest${ac_exeext} conftest.${ac_ext}`"; then | |
| 319 GC_SECTIONS_BREAKS_DEBUG_RANGES=no | |
| 320 else | |
| 321 GC_SECTIONS_BREAKS_DEBUG_RANGES=yes | |
| 322 fi | |
| 323 else | |
| 324 dnl We really don't expect to get here, but just in case | |
| 325 GC_SECTIONS_BREAKS_DEBUG_RANGES="no, but it's broken in some other way" | |
| 326 fi | |
| 327 rm -rf conftest*]) | |
| 328 if test "$GC_SECTIONS_BREAKS_DEBUG_RANGES" = no; then | |
| 329 DSO_LDOPTS="$DSO_LDOPTS -Wl,--gc-sections" | |
| 330 fi | |
| 331 else | |
| 332 DSO_LDOPTS="$DSO_LDOPTS -Wl,--gc-sections" | |
| 333 fi | |
| 334 fi | |
| 335 ]) | |
| 336 | |
| 337 dnl GCC and clang will fail if given an unknown warning option like -Wfoobar. | |
| 338 dnl But later versions won't fail if given an unknown negated warning option | |
| 339 dnl like -Wno-foobar. So when we are check for support of negated warning | |
| 340 dnl options, we actually test the positive form, but add the negated form to | |
| 341 dnl the flags variable. | |
| 342 | |
| 343 AC_DEFUN([MOZ_C_SUPPORTS_WARNING], | |
| 344 [ | |
| 345 AC_CACHE_CHECK(whether the C compiler supports $1$2, $3, | |
| 346 [ | |
| 347 AC_LANG_SAVE | |
| 348 AC_LANG_C | |
| 349 _SAVE_CFLAGS="$CFLAGS" | |
| 350 CFLAGS="$CFLAGS -Werror -W$2" | |
| 351 AC_TRY_COMPILE([], | |
| 352 [return(0);], | |
| 353 $3="yes", | |
| 354 $3="no") | |
| 355 CFLAGS="$_SAVE_CFLAGS" | |
| 356 AC_LANG_RESTORE | |
| 357 ]) | |
| 358 if test "${$3}" = "yes"; then | |
| 359 _WARNINGS_CFLAGS="${_WARNINGS_CFLAGS} $1$2" | |
| 360 fi | |
| 361 ]) | |
| 362 | |
| 363 AC_DEFUN([MOZ_CXX_SUPPORTS_WARNING], | |
| 364 [ | |
| 365 AC_CACHE_CHECK(whether the C++ compiler supports $1$2, $3, | |
| 366 [ | |
| 367 AC_LANG_SAVE | |
| 368 AC_LANG_CPLUSPLUS | |
| 369 _SAVE_CXXFLAGS="$CXXFLAGS" | |
| 370 CXXFLAGS="$CXXFLAGS -Werror -W$2" | |
| 371 AC_TRY_COMPILE([], | |
| 372 [return(0);], | |
| 373 $3="yes", | |
| 374 $3="no") | |
| 375 CXXFLAGS="$_SAVE_CXXFLAGS" | |
| 376 AC_LANG_RESTORE | |
| 377 ]) | |
| 378 if test "${$3}" = "yes"; then | |
| 379 _WARNINGS_CXXFLAGS="${_WARNINGS_CXXFLAGS} $1$2" | |
| 380 fi | |
| 381 ]) |
