Hi Aleksey , I tried with gcc 6.2 not 6.3 maybe this makes a difference .
Unfortunately I cannot see your exact gcc/g++ compile calls from the logfile . Do you have "-Wall" set which seems to be necessary to enable the additional flag ? https://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html -Wint-in-bool-context Warn for suspicious use of integer values where boolean values are expected, such as conditional expressions (?:) using non-boolean integer constants in boolean context, like if (a <= b ? 2 : 3). Or left shifting of signed integers in boolean context, like for (a = 0; 1 << a; a++);. Likewise for all kinds of multiplications regardless of the data type. This warning is enabled by -Wall. The configure flag --with-extra-cflags is not used by us . Best regards, Matthias > -----Original Message----- > From: Aleksey Shipilev <[email protected]> > Sent: Mittwoch, 31. Oktober 2018 16:49 > To: Baesken, Matthias <[email protected]>; 'build- > [email protected]' <[email protected]> > Subject: Re: minimal gcc version for jdk/jdk and usage of -Wno-int-in-bool- > context flag in HS build > > On 10/31/2018 04:40 PM, Baesken, Matthias wrote: > > > https://hg.openjdk.java.net/jdk/jdk/file/896e80158d35/make/hotspot/lib/C > ompileJvm.gmk > > > > DISABLED_WARNINGS_gcc := extra parentheses comment unknown- > pragmas address \ > > delete-non-virtual-dtor char-subscripts array-bounds int-in-bool-context > \ > > ignored-qualifiers missing-field-initializers implicit-fallthrough \ > > empty-body strict-overflow sequence-point maybe-uninitialized \ > > misleading-indentation > > > > > > However int-in-bool-context ( -Wnoint-in-bool-context ) seems to be > available only in gcc 7 + . > > Example call with gcc 6 leads to a warning : > > Current jdk/jdk build works fine with 6.3.0 for me: > > https://builds.shipilev.net/openjdk-jdk/openjdk-jdk-b441-20181029-jdk- > 12+17-linux-x86_64-fastdebug.configure.log > > https://builds.shipilev.net/openjdk-jdk/openjdk-jdk-b441-20181029-jdk- > 12+17-linux-x86_64-fastdebug.build.log > > Is this the indication that build system actually probes the warnings before > trying warning options? > > The troubles start when you supply additional options, apparently: > https://bugs.openjdk.java.net/browse/JDK-8211088 > > -Aleksey
