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[Bug 2115734] [NEW] glibc: tests FTBFS on ppc64el with new float128 ABI

To: debcrafters-packages@xxxxxxxxxxxxxxxxxxx
From: Simon Chopin <2115734@xxxxxxxxxxxxxxxxxx>
Date: Tue, 01 Jul 2025 14:40:38 -0000
Reply-to: Bug 2115734 <2115734@xxxxxxxxxxxxxxxxxx>
Sender: noreply@xxxxxxxxxxxxx
Public bug reported:

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.

** Affects: glibc (Ubuntu)
     Importance: Undecided
         Status: New

** Description changed:

  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  -I../include -I/<<PKGBUILDDIR>>/build-tree/ppc64el-libc/math  -I/<<PKGBUILDDIR>>/build-tree/ppc64el-libc  -I../sysdeps/unix/sysv/linux/powerpc/powerpc64/le/fpu  -I../sysdeps/unix/sysv/linux/powerpc/powerpc64/fpu  -I../sysdeps/unix/sysv/linux/powerpc/powerpc64/le  -I../sysdeps/unix/sysv/linux/powerpc/powerpc64  -I../sysdeps/unix/sysv/linux/wordsize-64  -I../sysdeps/unix/sysv/linux/powerpc  -I../sysdeps/powerpc/nptl  -I../sysdeps/unix/sysv/linux/include -I../sysdeps/unix/sysv/linux  -I../sysdeps/nptl  -I../sysdeps/pthread  -I../sysdeps/gnu  -I../sysdeps/unix/inet  -I../sysdeps/unix/sysv  -I../sysdeps/unix/powerpc  -I../sysdeps/unix  -I../sysdeps/posix  -I../sysdeps/powerpc/powerpc64/le/power9/fpu/multiarch  -I../sysdeps/powerpc/powerpc64/le/power8/fpu/multiarch  -I../sysdeps/powerpc/powerpc64/le/power7/fpu/multiarch  -I../sysdeps/powerpc/powerpc64/le/fpu/multiarch  -I../sysdeps/powerpc/powerpc64/le/power9/fpu  -I../sysdeps/powerpc/powerpc64/le/power8/fpu  -I../sysdeps/powerpc/powerpc64/le/power7/fpu  -I../sysdeps/powerpc/powerpc64/le/fpu  -I../sysdeps/powerpc/powerpc64/fpu  -I../sysdeps/powerpc/powerpc64/le/power9/multiarch  -I../sysdeps/powerpc/powerpc64/le/power8/multiarch  -I../sysdeps/powerpc/powerpc64/le/power7/multiarch  -I../sysdeps/powerpc/powerpc64/le/multiarch  -I../sysdeps/powerpc/powerpc64/multiarch  -I../sysdeps/powerpc/powerpc64/le/power9  -I../sysdeps/powerpc/powerpc64/le/power8  -I../sysdeps/powerpc/powerpc64/power8  -I../sysdeps/powerpc/powerpc64/le/power7  -I../sysdeps/powerpc/powerpc64/power7  -I../sysdeps/powerpc/powerpc64/power6  -I../sysdeps/powerpc/powerpc64/power4  -I../sysdeps/powerpc/power4  -I../sysdeps/powerpc/powerpc64/le  -I../sysdeps/powerpc/powerpc64  -I../sysdeps/wordsize-64  -I../sysdeps/powerpc/fpu  -I../sysdeps/powerpc  -I../sysdeps/ieee754/ldbl-128ibm-compat  -I../sysdeps/ieee754/ldbl-128ibm/include -I../sysdeps/ieee754/ldbl-128ibm  -I../sysdeps/ieee754/ldbl-opt  -I../sysdeps/ieee754/dbl-64  -I../sysdeps/ieee754/flt-32  -I../sysdeps/ieee754/float128  -I../sysdeps/ieee754  -I../sysdeps/generic  -I.. -I../libio -I. -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
+ 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));
-       |                                                                  ^~~~~~~~~~~~~~~~~~~~~~~~
+  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));
-       |                      ^~~~~~~~~~~~~~~~~~~~~~~~
+   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    -I../include
- -I/home/ubuntu/glibc-2.41/build/math  -I/home/ubuntu/glibc-2.41/build
- -I../sysdeps/unix/sysv/linux/powerpc/powerpc64/le/fpu
- -I../sysdeps/unix/sysv/linux/powerpc/powerpc64/fpu
- -I../sysdeps/unix/sysv/linux/powerpc/powerpc64/le
- -I../sysdeps/unix/sysv/linux/powerpc/powerpc64
- -I../sysdeps/unix/sysv/linux/wordsize-64
- -I../sysdeps/unix/sysv/linux/powerpc  -I../sysdeps/powerpc/nptl
- -I../sysdeps/unix/sysv/linux/include -I../sysdeps/unix/sysv/linux
- -I../sysdeps/nptl  -I../sysdeps/pthread  -I../sysdeps/gnu
- -I../sysdeps/unix/inet  -I../sysdeps/unix/sysv
- -I../sysdeps/unix/powerpc  -I../sysdeps/unix  -I../sysdeps/posix
- -I../sysdeps/powerpc/powerpc64/le/power9/fpu/multiarch
- -I../sysdeps/powerpc/powerpc64/le/power8/fpu/multiarch
- -I../sysdeps/powerpc/powerpc64/le/power7/fpu/multiarch
- -I../sysdeps/powerpc/powerpc64/le/fpu/multiarch
- -I../sysdeps/powerpc/powerpc64/le/power9/fpu
- -I../sysdeps/powerpc/powerpc64/le/power8/fpu
- -I../sysdeps/powerpc/powerpc64/le/power7/fpu
- -I../sysdeps/powerpc/powerpc64/le/fpu
- -I../sysdeps/powerpc/powerpc64/fpu
- -I../sysdeps/powerpc/powerpc64/le/power9/multiarch
- -I../sysdeps/powerpc/powerpc64/le/power8/multiarch
- -I../sysdeps/powerpc/powerpc64/le/power7/multiarch
- -I../sysdeps/powerpc/powerpc64/le/multiarch
- -I../sysdeps/powerpc/powerpc64/multiarch
- -I../sysdeps/powerpc/powerpc64/le/power9
- -I../sysdeps/powerpc/powerpc64/le/power8
- -I../sysdeps/powerpc/powerpc64/power8
- -I../sysdeps/powerpc/powerpc64/le/power7
- -I../sysdeps/powerpc/powerpc64/power7
- -I../sysdeps/powerpc/powerpc64/power6
- -I../sysdeps/powerpc/powerpc64/power4  -I../sysdeps/powerpc/power4
- -I../sysdeps/powerpc/powerpc64/le  -I../sysdeps/powerpc/powerpc64
- -I../sysdeps/wordsize-64  -I../sysdeps/powerpc/fpu  -I../sysdeps/powerpc
- -I../sysdeps/ieee754/ldbl-128ibm-compat
- -I../sysdeps/ieee754/ldbl-128ibm/include
- -I../sysdeps/ieee754/ldbl-128ibm  -I../sysdeps/ieee754/ldbl-opt
- -I../sysdeps/ieee754/dbl-64  -I../sysdeps/ieee754/flt-32
- -I../sysdeps/ieee754/float128  -I../sysdeps/ieee754
- -I../sysdeps/generic  -I.. -I../libio -I.  -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
+ -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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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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Follow ups

[Bug 2115734] Re: glibc: tests FTBFS on ppc64el with new float128 ABI
From: Launchpad Bug Tracker, 2025-07-02