1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/build/autoconf/compiler-opts.m4 Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,381 @@
1.4 +dnl This Source Code Form is subject to the terms of the Mozilla Public
1.5 +dnl License, v. 2.0. If a copy of the MPL was not distributed with this
1.6 +dnl file, You can obtain one at http://mozilla.org/MPL/2.0/.
1.7 +
1.8 +dnl Add compiler specific options
1.9 +
1.10 +AC_DEFUN([MOZ_DEFAULT_COMPILER],
1.11 +[
1.12 +dnl set DEVELOPER_OPTIONS early; MOZ_DEFAULT_COMPILER is usually the first non-setup directive
1.13 + if test -z "$MOZILLA_OFFICIAL"; then
1.14 + DEVELOPER_OPTIONS=1
1.15 + fi
1.16 + MOZ_ARG_ENABLE_BOOL(release,
1.17 + [ --enable-release Build with more conservative, release engineering-oriented options.
1.18 + This may slow down builds.],
1.19 + DEVELOPER_OPTIONS=,
1.20 + DEVELOPER_OPTIONS=1)
1.21 +
1.22 + AC_SUBST(DEVELOPER_OPTIONS)
1.23 +
1.24 +dnl Default to MSVC for win32 and gcc-4.2 for darwin
1.25 +dnl ==============================================================
1.26 +if test -z "$CROSS_COMPILE"; then
1.27 +case "$target" in
1.28 +*-mingw*)
1.29 + if test -z "$CC"; then CC=cl; fi
1.30 + if test -z "$CXX"; then CXX=cl; fi
1.31 + if test -z "$CPP"; then CPP="cl -E -nologo"; fi
1.32 + if test -z "$CXXCPP"; then CXXCPP="cl -TP -E -nologo"; ac_cv_prog_CXXCPP="$CXXCPP"; fi
1.33 + if test -z "$LD"; then LD=link; fi
1.34 + if test -z "$AS"; then
1.35 + case "${target_cpu}" in
1.36 + i*86)
1.37 + AS=ml;
1.38 + ;;
1.39 + x86_64)
1.40 + AS=ml64;
1.41 + ;;
1.42 + esac
1.43 + fi
1.44 + if test -z "$MIDL"; then MIDL=midl; fi
1.45 +
1.46 + # need override this flag since we don't use $(LDFLAGS) for this.
1.47 + if test -z "$HOST_LDFLAGS" ; then
1.48 + HOST_LDFLAGS=" "
1.49 + fi
1.50 + ;;
1.51 +*-darwin*)
1.52 + # GCC on darwin is based on gcc 4.2 and we don't support it anymore.
1.53 + if test -z "$CC"; then
1.54 + MOZ_PATH_PROGS(CC, clang)
1.55 + fi
1.56 + if test -z "$CXX"; then
1.57 + MOZ_PATH_PROGS(CXX, clang++)
1.58 + fi
1.59 + IS_GCC=$($CC -v 2>&1 | grep gcc)
1.60 + if test -n "$IS_GCC"
1.61 + then
1.62 + echo gcc is known to be broken on OS X, please use clang.
1.63 + echo see http://developer.mozilla.org/en-US/docs/Developer_Guide/Build_Instructions/Mac_OS_X_Prerequisites
1.64 + echo for more information.
1.65 + exit 1
1.66 + fi
1.67 + ;;
1.68 +esac
1.69 +fi
1.70 +])
1.71 +
1.72 +dnl ============================================================================
1.73 +dnl C++ rtti
1.74 +dnl We don't use it in the code, but it can be usefull for debugging, so give
1.75 +dnl the user the option of enabling it.
1.76 +dnl ============================================================================
1.77 +AC_DEFUN([MOZ_RTTI],
1.78 +[
1.79 +MOZ_ARG_ENABLE_BOOL(cpp-rtti,
1.80 +[ --enable-cpp-rtti Enable C++ RTTI ],
1.81 +[ _MOZ_USE_RTTI=1 ],
1.82 +[ _MOZ_USE_RTTI= ])
1.83 +
1.84 +if test -z "$_MOZ_USE_RTTI"; then
1.85 + if test "$GNU_CC"; then
1.86 + CXXFLAGS="$CXXFLAGS -fno-rtti"
1.87 + else
1.88 + case "$target" in
1.89 + *-mingw*)
1.90 + CXXFLAGS="$CXXFLAGS -GR-"
1.91 + esac
1.92 + fi
1.93 +fi
1.94 +])
1.95 +
1.96 +dnl ========================================================
1.97 +dnl =
1.98 +dnl = Debugging Options
1.99 +dnl =
1.100 +dnl ========================================================
1.101 +AC_DEFUN([MOZ_DEBUGGING_OPTS],
1.102 +[
1.103 +dnl Debug info is ON by default.
1.104 +if test -z "$MOZ_DEBUG_FLAGS"; then
1.105 + if test -n "$_MSC_VER"; then
1.106 + MOZ_DEBUG_FLAGS="-Zi"
1.107 + else
1.108 + MOZ_DEBUG_FLAGS="-g"
1.109 + fi
1.110 +fi
1.111 +
1.112 +AC_SUBST(MOZ_DEBUG_FLAGS)
1.113 +
1.114 +MOZ_ARG_ENABLE_STRING(debug,
1.115 +[ --enable-debug[=DBG] Enable building with developer debug info
1.116 + (using compiler flags DBG)],
1.117 +[ if test "$enableval" != "no"; then
1.118 + MOZ_DEBUG=1
1.119 + if test -n "$enableval" -a "$enableval" != "yes"; then
1.120 + MOZ_DEBUG_FLAGS=`echo $enableval | sed -e 's|\\\ | |g'`
1.121 + _MOZ_DEBUG_FLAGS_SET=1
1.122 + fi
1.123 + else
1.124 + MOZ_DEBUG=
1.125 + fi ],
1.126 + MOZ_DEBUG=)
1.127 +
1.128 +MOZ_DEBUG_ENABLE_DEFS="-DDEBUG -D_DEBUG -DTRACING"
1.129 +MOZ_ARG_WITH_STRING(debug-label,
1.130 +[ --with-debug-label=LABELS
1.131 + Define DEBUG_<value> for each comma-separated
1.132 + value given.],
1.133 +[ for option in `echo $withval | sed 's/,/ /g'`; do
1.134 + MOZ_DEBUG_ENABLE_DEFS="$MOZ_DEBUG_ENABLE_DEFS -DDEBUG_${option}"
1.135 +done])
1.136 +
1.137 +MOZ_DEBUG_DISABLE_DEFS="-DNDEBUG -DTRIMMED"
1.138 +
1.139 +if test -n "$MOZ_DEBUG"; then
1.140 + AC_MSG_CHECKING([for valid debug flags])
1.141 + _SAVE_CFLAGS=$CFLAGS
1.142 + CFLAGS="$CFLAGS $MOZ_DEBUG_FLAGS"
1.143 + AC_TRY_COMPILE([#include <stdio.h>],
1.144 + [printf("Hello World\n");],
1.145 + _results=yes,
1.146 + _results=no)
1.147 + AC_MSG_RESULT([$_results])
1.148 + if test "$_results" = "no"; then
1.149 + AC_MSG_ERROR([These compiler flags are invalid: $MOZ_DEBUG_FLAGS])
1.150 + fi
1.151 + CFLAGS=$_SAVE_CFLAGS
1.152 +fi
1.153 +
1.154 +dnl ========================================================
1.155 +dnl = Enable generation of debug symbols
1.156 +dnl ========================================================
1.157 +MOZ_ARG_ENABLE_STRING(debug-symbols,
1.158 +[ --enable-debug-symbols[=DBG]
1.159 + Enable debugging symbols (using compiler flags DBG)],
1.160 +[ if test "$enableval" != "no"; then
1.161 + MOZ_DEBUG_SYMBOLS=1
1.162 + if test -n "$enableval" -a "$enableval" != "yes"; then
1.163 + if test -z "$_MOZ_DEBUG_FLAGS_SET"; then
1.164 + MOZ_DEBUG_FLAGS=`echo $enableval | sed -e 's|\\\ | |g'`
1.165 + else
1.166 + AC_MSG_ERROR([--enable-debug-symbols flags cannot be used with --enable-debug flags])
1.167 + fi
1.168 + fi
1.169 + else
1.170 + MOZ_DEBUG_SYMBOLS=
1.171 + fi ],
1.172 + MOZ_DEBUG_SYMBOLS=1)
1.173 +
1.174 +if test -n "$MOZ_DEBUG" -o -n "$MOZ_DEBUG_SYMBOLS"; then
1.175 + AC_DEFINE(MOZ_DEBUG_SYMBOLS)
1.176 + export MOZ_DEBUG_SYMBOLS
1.177 +fi
1.178 +
1.179 +])
1.180 +
1.181 +dnl A high level macro for selecting compiler options.
1.182 +AC_DEFUN([MOZ_COMPILER_OPTS],
1.183 +[
1.184 + if test "${MOZ_PSEUDO_DERECURSE-unset}" = unset; then
1.185 + dnl Don't enable on pymake, because of bug 918652. Bug 912979 is an annoyance
1.186 + dnl with pymake, too.
1.187 + MOZ_PSEUDO_DERECURSE=no-pymake
1.188 + fi
1.189 +
1.190 + MOZ_DEBUGGING_OPTS
1.191 + MOZ_RTTI
1.192 +if test "$CLANG_CXX"; then
1.193 + ## We disable return-type-c-linkage because jsval is defined as a C++ type but is
1.194 + ## returned by C functions. This is possible because we use knowledge about the ABI
1.195 + ## to typedef it to a C type with the same layout when the headers are included
1.196 + ## from C.
1.197 + ##
1.198 + ## mismatched-tags is disabled (bug 780474) mostly because it's useless.
1.199 + ## Worse, it's not supported by gcc, so it will cause tryserver bustage
1.200 + ## without any easy way for non-Clang users to check for it.
1.201 + _WARNINGS_CXXFLAGS="${_WARNINGS_CXXFLAGS} -Wno-unknown-warning-option -Wno-return-type-c-linkage -Wno-mismatched-tags"
1.202 +fi
1.203 +
1.204 +AC_MSG_CHECKING([whether the C++ compiler ($CXX $CXXFLAGS $LDFLAGS) actually is a C++ compiler])
1.205 +AC_LANG_SAVE
1.206 +AC_LANG_CPLUSPLUS
1.207 +_SAVE_LIBS=$LIBS
1.208 +LIBS=
1.209 +AC_TRY_LINK([#include <new>], [int *foo = new int;],,
1.210 + AC_MSG_RESULT([no])
1.211 + AC_MSG_ERROR([$CXX $CXXFLAGS $LDFLAGS failed to compile and link a simple C++ source.]))
1.212 +LIBS=$_SAVE_LIBS
1.213 +AC_LANG_RESTORE
1.214 +AC_MSG_RESULT([yes])
1.215 +
1.216 +if test -z "$GNU_CC"; then
1.217 + case "$target" in
1.218 + *-mingw*)
1.219 + ## Warning 4099 (equivalent of mismatched-tags) is disabled (bug 780474)
1.220 + ## for the same reasons as above.
1.221 + _WARNINGS_CXXFLAGS="${_WARNINGS_CXXFLAGS} -wd4099"
1.222 + esac
1.223 +fi
1.224 +
1.225 +if test -n "$DEVELOPER_OPTIONS"; then
1.226 + MOZ_FORCE_GOLD=1
1.227 +fi
1.228 +
1.229 +MOZ_ARG_ENABLE_BOOL(gold,
1.230 +[ --enable-gold Enable GNU Gold Linker when it is not already the default],
1.231 + MOZ_FORCE_GOLD=1,
1.232 + MOZ_FORCE_GOLD=
1.233 + )
1.234 +
1.235 +if test "$GNU_CC" -a -n "$MOZ_FORCE_GOLD"; then
1.236 + dnl if the default linker is BFD ld, check if gold is available and try to use it
1.237 + dnl for local builds only.
1.238 + if $CC -Wl,--version 2>&1 | grep -q "GNU ld"; then
1.239 + GOLD=$($CC -print-prog-name=ld.gold)
1.240 + case "$GOLD" in
1.241 + /*)
1.242 + ;;
1.243 + *)
1.244 + GOLD=$(which $GOLD)
1.245 + ;;
1.246 + esac
1.247 + if test -n "$GOLD"; then
1.248 + mkdir -p $_objdir/build/unix/gold
1.249 + rm -f $_objdir/build/unix/gold/ld
1.250 + ln -s "$GOLD" $_objdir/build/unix/gold/ld
1.251 + if $CC -B $_objdir/build/unix/gold -Wl,--version 2>&1 | grep -q "GNU gold"; then
1.252 + LDFLAGS="$LDFLAGS -B $_objdir/build/unix/gold"
1.253 + else
1.254 + rm -rf $_objdir/build/unix/gold
1.255 + fi
1.256 + fi
1.257 + fi
1.258 +fi
1.259 +
1.260 +if test "$GNU_CC"; then
1.261 + if test -z "$DEVELOPER_OPTIONS"; then
1.262 + CFLAGS="$CFLAGS -ffunction-sections -fdata-sections"
1.263 + CXXFLAGS="$CXXFLAGS -ffunction-sections -fdata-sections"
1.264 + fi
1.265 + CFLAGS="$CFLAGS -fno-math-errno"
1.266 + CXXFLAGS="$CXXFLAGS -fno-exceptions -fno-math-errno"
1.267 +fi
1.268 +
1.269 +dnl ========================================================
1.270 +dnl = Identical Code Folding
1.271 +dnl ========================================================
1.272 +
1.273 +MOZ_ARG_DISABLE_BOOL(icf,
1.274 +[ --disable-icf Disable Identical Code Folding],
1.275 + MOZ_DISABLE_ICF=1,
1.276 + MOZ_DISABLE_ICF= )
1.277 +
1.278 +if test "$GNU_CC" -a "$GCC_USE_GNU_LD" -a -z "$MOZ_DISABLE_ICF" -a -z "$DEVELOPER_OPTIONS"; then
1.279 + AC_CACHE_CHECK([whether the linker supports Identical Code Folding],
1.280 + LD_SUPPORTS_ICF,
1.281 + [echo 'int foo() {return 42;}' \
1.282 + 'int bar() {return 42;}' \
1.283 + 'int main() {return foo() - bar();}' > conftest.${ac_ext}
1.284 + # If the linker supports ICF, foo and bar symbols will have
1.285 + # the same address
1.286 + if AC_TRY_COMMAND([${CC-cc} -o conftest${ac_exeext} $LDFLAGS -Wl,--icf=safe -ffunction-sections conftest.${ac_ext} $LIBS 1>&2]) &&
1.287 + test -s conftest${ac_exeext} &&
1.288 + objdump -t conftest${ac_exeext} | awk changequote(<<, >>)'{a[<<$>>6] = <<$>>1} END {if (a["foo"] && (a["foo"] != a["bar"])) { exit 1 }}'changequote([, ]); then
1.289 + LD_SUPPORTS_ICF=yes
1.290 + else
1.291 + LD_SUPPORTS_ICF=no
1.292 + fi
1.293 + rm -rf conftest*])
1.294 + if test "$LD_SUPPORTS_ICF" = yes; then
1.295 + _SAVE_LDFLAGS="$LDFLAGS -Wl,--icf=safe"
1.296 + LDFLAGS="$LDFLAGS -Wl,--icf=safe -Wl,--print-icf-sections"
1.297 + AC_TRY_LINK([], [],
1.298 + [LD_PRINT_ICF_SECTIONS=-Wl,--print-icf-sections],
1.299 + [LD_PRINT_ICF_SECTIONS=])
1.300 + AC_SUBST([LD_PRINT_ICF_SECTIONS])
1.301 + LDFLAGS="$_SAVE_LDFLAGS"
1.302 + fi
1.303 +fi
1.304 +
1.305 +dnl ========================================================
1.306 +dnl = Automatically remove dead symbols
1.307 +dnl ========================================================
1.308 +
1.309 +if test "$GNU_CC" -a "$GCC_USE_GNU_LD" -a -z "$DEVELOPER_OPTIONS"; then
1.310 + if test -n "$MOZ_DEBUG_FLAGS"; then
1.311 + dnl See bug 670659
1.312 + AC_CACHE_CHECK([whether removing dead symbols breaks debugging],
1.313 + GC_SECTIONS_BREAKS_DEBUG_RANGES,
1.314 + [echo 'int foo() {return 42;}' \
1.315 + 'int bar() {return 1;}' \
1.316 + 'int main() {return foo();}' > conftest.${ac_ext}
1.317 + if AC_TRY_COMMAND([${CC-cc} -o conftest.${ac_objext} $CFLAGS $MOZ_DEBUG_FLAGS -c conftest.${ac_ext} 1>&2]) &&
1.318 + AC_TRY_COMMAND([${CC-cc} -o conftest${ac_exeext} $LDFLAGS $MOZ_DEBUG_FLAGS -Wl,--gc-sections conftest.${ac_objext} $LIBS 1>&2]) &&
1.319 + test -s conftest${ac_exeext} -a -s conftest.${ac_objext}; then
1.320 + if test "`$PYTHON -m mozbuild.configure.check_debug_ranges conftest.${ac_objext} conftest.${ac_ext}`" = \
1.321 + "`$PYTHON -m mozbuild.configure.check_debug_ranges conftest${ac_exeext} conftest.${ac_ext}`"; then
1.322 + GC_SECTIONS_BREAKS_DEBUG_RANGES=no
1.323 + else
1.324 + GC_SECTIONS_BREAKS_DEBUG_RANGES=yes
1.325 + fi
1.326 + else
1.327 + dnl We really don't expect to get here, but just in case
1.328 + GC_SECTIONS_BREAKS_DEBUG_RANGES="no, but it's broken in some other way"
1.329 + fi
1.330 + rm -rf conftest*])
1.331 + if test "$GC_SECTIONS_BREAKS_DEBUG_RANGES" = no; then
1.332 + DSO_LDOPTS="$DSO_LDOPTS -Wl,--gc-sections"
1.333 + fi
1.334 + else
1.335 + DSO_LDOPTS="$DSO_LDOPTS -Wl,--gc-sections"
1.336 + fi
1.337 +fi
1.338 +])
1.339 +
1.340 +dnl GCC and clang will fail if given an unknown warning option like -Wfoobar.
1.341 +dnl But later versions won't fail if given an unknown negated warning option
1.342 +dnl like -Wno-foobar. So when we are check for support of negated warning
1.343 +dnl options, we actually test the positive form, but add the negated form to
1.344 +dnl the flags variable.
1.345 +
1.346 +AC_DEFUN([MOZ_C_SUPPORTS_WARNING],
1.347 +[
1.348 + AC_CACHE_CHECK(whether the C compiler supports $1$2, $3,
1.349 + [
1.350 + AC_LANG_SAVE
1.351 + AC_LANG_C
1.352 + _SAVE_CFLAGS="$CFLAGS"
1.353 + CFLAGS="$CFLAGS -Werror -W$2"
1.354 + AC_TRY_COMPILE([],
1.355 + [return(0);],
1.356 + $3="yes",
1.357 + $3="no")
1.358 + CFLAGS="$_SAVE_CFLAGS"
1.359 + AC_LANG_RESTORE
1.360 + ])
1.361 + if test "${$3}" = "yes"; then
1.362 + _WARNINGS_CFLAGS="${_WARNINGS_CFLAGS} $1$2"
1.363 + fi
1.364 +])
1.365 +
1.366 +AC_DEFUN([MOZ_CXX_SUPPORTS_WARNING],
1.367 +[
1.368 + AC_CACHE_CHECK(whether the C++ compiler supports $1$2, $3,
1.369 + [
1.370 + AC_LANG_SAVE
1.371 + AC_LANG_CPLUSPLUS
1.372 + _SAVE_CXXFLAGS="$CXXFLAGS"
1.373 + CXXFLAGS="$CXXFLAGS -Werror -W$2"
1.374 + AC_TRY_COMPILE([],
1.375 + [return(0);],
1.376 + $3="yes",
1.377 + $3="no")
1.378 + CXXFLAGS="$_SAVE_CXXFLAGS"
1.379 + AC_LANG_RESTORE
1.380 + ])
1.381 + if test "${$3}" = "yes"; then
1.382 + _WARNINGS_CXXFLAGS="${_WARNINGS_CXXFLAGS} $1$2"
1.383 + fi
1.384 +])
