Python configure is already checking that the C++ compiler is indeed a C++
compiler, no need to double check in old-configure.
--HG--
extra : rebase_source : fcb6fc7ac88dcf3ef172cd30e23454b654e08c03
Setting MOZ_DEBUG_SYMBOLS as a define was not moved, as this value is not
checked, and exporting MOZ_DEBUG_SYMBOLS was not moved, as this would only
impact nspr, and we're no longer using the nspr build system.
MozReview-Commit-ID: EvBTunhxcsr
- DEVELOPER_OPTIONS, INTEL_CC, INTEL_CXX, MOZ_ENABLE_QTMOBILITY,
GTK_CONFIG are or even were never used outside configure.
- MOZ_PROFILELOCKING which gradually became a no-op over the years. This
also removes the configure flag that sets it.
- XULRUNNER_STUB_NAME is xulrunner-only, and xulrunner is gone. This
also removes the configure flag that sets it.
- The only use of MOZ_CAN_RUN_PROGRAMS was removed in bug 780561.
- AR_LIST and AR_DELETE have not been used since bug 584474.
- MOZ_COMPONENT_NSPR_LIBS is leftover from bug 1036894.
- MOZ_PNG_ARM_NEON_CHECK is not used since bug 980488.
- MOZ_WEBRTC_LEAKING_TESTS has been no-oped by bug 825510.
- VPX_NEED_OBJ_INT_EXTRACT and NO_INTEGRATED_AS_CFLAGS are not used since
bug 1151175.
- WCHAR_CFLAGS is not used since bug 904985.
compiler-opts.m4's check for `MOZ_CXX_SUPPORTS_WARNING(-W, unreachable-code-return, ac_cxx_has_wunreachable_code_return)` is broken. The C/C++ code that configure emits for MOZ_CXX_SUPPORTS_WARNING() actually contains a -Wunreachable-code-return warning and, thus, doesn't actually detect that clang supports the -Wunreachable-code-return flag.
This configure code in MOZ_CXX_SUPPORTS_WARNING():
AC_TRY_COMPILE([],
[return(0);],
$3="yes",
$3="no")
generates something like:
int main() {
return(0);
; return 0; }
where the second return, automatically emitted by configure, is unreachable and causes a -Wunreachable-code-return warning.
The fix is to remove the redundant return(0) from MOZ_CXX_SUPPORTS_WARNING(). This allows clang's -Wunreachable-code-return flag to be detected, but then -Wunreachable-code-return breaks other configure checks, including third-party libraries' configure checks (in particular jemalloc) that also have redundant `return(0)`. So all the third-party libraries' configure checks would need to be fixed upstream, which seems like more hassle than the value of the -Wunreachable-code-return warnings.
-Wno-psabi has not been necessary since we updated the build machines to Android NDK r8c three years ago in bug 826133.
-Wsometimes-initialized is not necessary because it is implicitly enabled by clang's -Wuninitialized, which is enable by -Wall.
-Wcast-align is very noisy and we apparently only enable it for gcc on 32-bit x86 builds?
-Wno-unused-local-typedef is no longer necessary. This is the clang flag; gcc's flag is -Wno-unused-local-typedefs, with an 's'. Suppressing gcc's warning was recently deemed unnecessary and WONTFIX'd in bug 1243604. Unsurprisingly, we no longer need it on clang either.
-Wrange-loop-analysis is no longer necessary because it is implicitly enabled by -Wloop-analysis, which is enabled by the previous commit.
-Wsign-compare is enabled by gcc's -Wall (for C++ only), but not by clang's -Wall. -Wsign-compare is enabled for C and C++ by gcc's -Wextra and clang's -Wextra, which we don't use.
The flags added in toolkit/locales/Makefile.in turn out not to be actually
used, so just remove that.
The remaining uses of XULPPFLAGS are to set debug flags depending on whether
MOZ_DEBUG is set or not. Just set a dedicated variable with the right value
from configure.
CLOSED TREE (but for the commit above this because the commit hook only
appears to look at the tip commit)
--HG--
extra : rebase_source : c88e7e3f4d24dcd59a1a0b5577e3a77da68f3d08
extra : amend_source : 5be936181048b01850e9ef91c25fa0c7363d118d
MOZ_COMPILER_OPTS depends on MOZ_DEBUG_FLAGS being set for proper checking of
linker dead code deletion when using GCC.
GC'ing sections saves ~1.5MB off of mobile libxul according to size(1):
[froydnj@cerebro eideticker]$ size /opt/build/froydnj/build-android/dist/bin/libxul.so
text data bss dec hex filename
23733400 2314816 1495973 27544189 1a44a7d /opt/build/froydnj/build-android/dist/bin/libxul.so
[froydnj@cerebro eideticker]$ size /opt/build/froydnj/build-android/dist/bin/libxul.so
text data bss dec hex filename
22261936 2145116 1494533 25901585 18b3a11 /opt/build/froydnj/build-android/dist/bin/libxul.so
Mike Hommey
Chris Manchester
Chris Peterson
Ryan VanderMeulen
James Willcox
Abhishek Bhattacharya
Jed Davis
Ehsan Akhgari
Ed Morley
Birunthan Mohanathas
Vladimir Vukicevic
Dan Gohman
Nathan Froyd
Rafael Ávila de Espíndola