Bug#951085: gcc-10: FTBFS due to missing parens in versioned break

[Andres Salomon <dilinger@queued.net>]

Package: gcc-10

Version: 10-20200210-1

Severity: serious

gcc-10 is failing to build with the following error:

dpkg-gencontrol: error: error occurred while parsing Breaks field: cryptsetup-initramfs << 2:2.2.2-3~, 
dh_gencontrol: error: dpkg-gencontrol -plibgcc-s1 -ldebian/changelog -Tdebian/libgcc-s1.substvars -Pdebian/.debhelper/libgcc-s1/dbgsym-root -v10-20200210-1 -Vlibgcc:Version=10-20200210-1 -Vgcc:Version=10-20200210-1 -Vgcc:EpochVersion=1:10-20200210-1 -Vgcc:SoftVersion=10 -Vgdc:Version=10-20200210-1 -Vgm2:Version=10-20200210-1 -Vgnat:Version=10-20200210-1 -Vgnat:SoftVersion=10 -Vbinutils:Version=2.34 "-Vdep:libgcc=libgcc-s1 (>= \${gcc:Version})" "-Vdep:libgccdev=libgcc-10-dev (= \${gcc:Version})" -Vdep:libgccbiarch= -Vdep:libgccbiarchdev= "-Vdep:libc=libc6 (>= 2.11)" "-Vdep:libcdev=libc6-dev (>= 2.13-5)" -Vdep:libcbiarch= -Vdep:libcbiarchdev= -Vdep:libunwinddev= -Vdep:libcxxbiarchdev= -Vdep:libcxxbiarchdbg= -Vdep:libgnat= "-Vbase:Breaks=gnat (<< 7)" "-Vlibgcc:Breaks=cryptsetup-initramfs << 2:2.2.2-3~, " "-Vdep:gold=binutils-gold (>= 2.34)" "-Vdep:libgomp=libgomp1 (>= \${gcc:Version})" "-Vdep:libitm=libitm1 (>= \${gcc:Version})" "-Vdep:libatomic=libatomic1 
 (>= \${gcc:Version})" "-Vdep:libasan=libasan6 (>= \${gcc:Version})" "-Vdep:liblsan=liblsan0 (>= \${gcc:Version})" "-Vdep:libtsan=libtsan0 (>= \${gcc:Version})" "-Vdep:libubsan=libubsan1 (>= \${gcc:Version})" "-Vdep:libqmath=libquadmath0 (>= \${gcc:Version})" -Vdep:libx32z= "-Vdep:libcc1=libcc1-0 (>= \${gcc:Version})" "-Vmultiarch:breaks=gcc-4.3 (<< 4.3.6-1), gcc-4.4 (<< 4.4.6-4), gcc-4.5 (<< 4.5.3-2)" "-Vgolang:Conflicts=golang-go (<< 2:1.3.3-1ubuntu2)" -Vfortran:mod-version=gfortran-mod-15 -UPre-Depends -URecommends -USuggests -UEnhances -UProvides -UEssential -UConflicts -DPriority=optional -UHomepage -UImportant -UBuilt-Using -DAuto-Built-Package=debug-symbols -DPackage=libgcc-s1-dbgsym "-DDepends=libgcc-s1 (= \${binary:Version})" "-DDescription=debug symbols for libgcc-s1" -DBuild-Ids=b8c5e334209666a8039479266ddbf6322ef1d78b -DSection=debug "-DReplaces=libgcc-s1-dbg (<< 9.2.1-21)" "-DBreaks=libgcc-s1-dbg (<< 9.2.1-21)" ret
 urned exit code 25

Full build log is at https://buildd.debian.org/status/fetch.php?pkg=gcc-10&arch=ppc64el&ver=10-20200210-1&stamp=1581374256&raw=0

The issue appears to be in debian/rules.conf:

  LIBGCC_BREAKS += cryptsetup-initramfs << 2:2.2.2-3~,

That versioned break needs parenthesis:

  LIBGCC_BREAKS += cryptsetup-initramfs (<< 2:2.2.2-3~),

Thanks,

Andres