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[Launchpad Bug Tracker <2115734@xxxxxxxxxxxxxxxxxx>]

** Merge proposal linked:
   https://code.launchpad.net/~ubuntu-core-dev/ubuntu/+source/glibc/+git/glibc/+merge/488220

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https://bugs.launchpad.net/bugs/2115734

Title:
  glibc: tests FTBFS on ppc64el with new float128 ABI

Status in glibc package in Ubuntu:
  New

Bug description:
  Currently, in the archive, testsuite failures are being ignored.
  However, once that is fixed, on ppc64el, the build fails with the
  following error:

  powerpc64le-linux-gnu-gcc -D_DISTRO_EVADE_TIME_BITS -U_FILE_OFFSET_BITS -U_TIME_BITS /<<PKGBUILDDIR>>/build-tree/ppc64el-libc/math/test-tgmath3-atan2.c -c -std=gnu11 -fgnu89-inline  -pipe -O2 -g -fdebug-prefix-map=/<<PKGBUILDDIR>>=. -O3 -fno-tree-vectorize -Wno-error=stringop-overflow -mcpu=power9 -Wall -Wwrite-strings -Wundef -Wimplicit-fallthrough -Werror -fmerge-all-constants -frounding-math -fstack-protector-strong -fno-common -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=3 -Wstrict-prototypes -Wold-style-definition -fmath-errno  -Wno-psabi -mno-gnu-attribute  -fPIE       -fno-builtin  -isystem /<<PKGBUILDDIR>>/debian/include <<LOTS_OF_-I_FLAGS>> -nostdinc -isystem /usr/lib/gcc/powerpc64le-linux-gnu/14/include -isystem /<<PKGBUILDDIR>>/debian/include -D_LIBC_REENTRANT -include /<<PKGBUILDDIR>>/build-tree/ppc64el-libc/libc-modules.h -DMODULE_NAME=testsuite -include ../include/libc-symbols.h  -DPIC     -DTOP_NAMESPACE=glibc -I../soft-fp -o /<<PKGBUILDDIR>>/build-tree/ppc64el-libc/math/test-tgmath3-atan2.o -MD -MP -MF /<<PKGBUILDDIR>>/build-tree/ppc64el-libc/math/test-tgmath3-atan2.o.dt -MT /<<PKGBUILDDIR>>/build-tree/ppc64el-libc/math/test-tgmath3-atan2.o
  /<<PKGBUILDDIR>>/build-tree/ppc64el-libc/math/test-tgmath3-atan2.c: In function ‘test_atan2_132’:
  /<<PKGBUILDDIR>>/build-tree/ppc64el-libc/math/test-tgmath3-atan2.c:1247:66: error: conflicting types for ‘var_long_double_Float64x’; have ‘_Float64x’
   1247 |   extern typeof (atan2 (vol_var_long_double, vol_var__Float64x)) var_long_double_Float64x __attribute__ ((unused));
        |                                                                  ^~~~~~~~~~~~~~~~~~~~~~~~
  /<<PKGBUILDDIR>>/build-tree/ppc64el-libc/math/test-tgmath3-atan2.c:179:22: note: previous declaration of ‘var_long_double_Float64x’ with type ‘long_double_Float64x’ {aka ‘long double’}
    179 | long_double_Float64x var_long_double_Float64x __attribute__ ((unused));
        |                      ^~~~~~~~~~~~~~~~~~~~~~~~
  make[3]: *** [../o-iterator.mk:9: /<<PKGBUILDDIR>>/build-tree/ppc64el-libc/math/test-tgmath3-atan2.o] Error 1

  This test file is generated. I have confirmed that the generated file
  is identical regardless of the default ABI used by GCC.

  For comparison, a manual build of the same source tree with "mkcd
  build; ../configure --prefix; make; make check" yields the following
  gcc invocation:

  gcc /home/ubuntu/glibc-2.41/build/math/test-tgmath3-atan2.c -c
  -std=gnu11 -fgnu89-inline  -g -O2 -mabi=ibmlongdouble -Wall -Wwrite-
  strings -Wundef -Wimplicit-fallthrough -Werror -fmerge-all-constants
  -frounding-math -fno-stack-protector -fno-common -U_FORTIFY_SOURCE
  -Wstrict-prototypes -Wold-style-definition -fmath-errno  -Wno-psabi
  -mno-gnu-attribute  -fPIE       -fno-builtin <LOTS_OF_-I_FLAGS>
  -D_LIBC_REENTRANT -include /home/ubuntu/glibc-2.41/build/libc-
  modules.h -DMODULE_NAME=testsuite -include ../include/libc-symbols.h
  -DPIC -DTOP_NAMESPACE=glibc -I../soft-fp -o
  /home/ubuntu/glibc-2.41/build/math/test-tgmath3-atan2.o -MD -MP -MF
  /home/ubuntu/glibc-2.41/build/math/test-tgmath3-atan2.o.dt -MT
  /home/ubuntu/glibc-2.41/build/math/test-tgmath3-atan2.o

  One will note that the default build script adds -mabi=ibmlongdouble

  It turns out that the way we pass CFLAGS will cause the build system
  to sometimes ignore file-specific flags rather than combining them.

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