This patch makes the glibc build generate an additional header
ldbl-compat-choose.h that defines LONG_DOUBLE_COMPAT_CHOOSE_* macros
for each libc and libm symbol, which select one or the other of their
arguments based on whether the symbol was added before a change to
long double != double.
The effect of this is that it is then possible to define a macro
maybe_long_double_symbol that automatically acts as either
long_double_symbol or weak_alias depending on when the symbol being
defined was added. This can be used when building long double
functions from type-generic templates. Thus, with this patch ldbl-opt
no longer needs special long double implementations of each new libm
function added using such a template, and the existing such
implementations are removed.
This is a step towards being able more generally to use common macros
to create all the aliases needed for a libm function, so reducing the
amount of special-case code needed in ldbl-opt and ldbl-64-128, and
facilitating subsequently adding *f32 / *f64 / *f128 / *f32x / *f64x
aliases to existing functions (where the set of aliases that a
function should have may depend on the architecture in various ways).
Tested with build-many-glibcs.py. Except for on
powerpc64le-linux-gnu, installed stripped shared libraries are
unchanged by the patch. powerpc64le-linux-gnu is the unique
configuration which used ldbl-opt from the start rather than adding a
new long double choice after originally only having had long double =
double. The effect of the patch there is that various cases that
previously used long_double_symbol unconditionally now use weak_alias
instead, so .os files contain e.g. a symbol cabsl instead of
cabsl@@GLIBC_2.17. The final dynamic symbols and versions in the
resulting shared libraries are unchanged (ABI tests pass), as is the
disassembly of the shared libraries, but the differences in the .os
files still result in different .gnu_hash contents in libm.so; the
differences are of no significance and logically using weak_alias is
what's most appropriate in those cases.
* scripts/versions.awk: Generate ldbl-compat-choose.h.
* sysdeps/ieee754/ldbl-opt/math-type-macros-ldouble.h: Include
<ldbl-compat-choose.h>.
(maybe_long_double_symbol): New macro.
[!declare_mgen_alias] (declare_mgen_alias): Use
maybe_long_double_symbol.
* sysdeps/ieee754/ldbl-opt/s_canonicalizel.c: Remove.
* sysdeps/ieee754/ldbl-opt/s_fmaxmagl.c: Likewise.
* sysdeps/ieee754/ldbl-opt/s_fminmagl.c: Likewise.
* sysdeps/ieee754/ldbl-opt/s_nextdownl.c: Likewise.
* sysdeps/ieee754/ldbl-opt/w_llogbl.c: Likewise.
* Makerules [$(build-shared) = yes && !avoid-generated]
(before-compile): Add $(common-objpfx)ldbl-compat-choose.h.
[$(build-shared) = yes && !avoid-generated]
($(common-objpfx)ldbl-compat-choose.h): New target.
This patch arranges for the glibc build to generate a header
first-versions.h that defines macros for the earliest symbol version
in which each public symbol (GLIBC_[0-9]* symbol version, name only
uses C identifier characters) is available.
This is used in sysdeps/ieee754/ldbl-opt/math-type-macros-double.h to
replace the manually defined LDOUBLE_*_libm_version macros for various
functions defined using type-generic templates, the purpose of which
is to use in LONG_DOUBLE_COMPAT tests "was this function originally
added before glibc supported long double != double on this platform?".
As discussed in
<https://sourceware.org/ml/libc-alpha/2016-12/msg00246.html>, I expect
this to be useful more generally in reducing the amount of
special-case code needed in ldbl-opt and ldbl-64-128.
Tested with build-many-glibcs.py that installed stripped shared
libraries are unchanged by this patch.
* scripts/versions.awk: Generate first-versions.h.
* sysdeps/ieee754/ldbl-opt/math-type-macros-double.h: Include
<first-versions.h>.
(LDOUBLE_cabsl_libm_version): Remove macro.
(LDOUBLE_cargl_libm_version): Likewise.
(LDOUBLE_cimagl_libm_version): Likewise.
(LDOUBLE_conjl_libm_version): Likewise.
(LDOUBLE_creall_libm_version): Likewise.
(LDOUBLE_cacosl_libm_version): Likewise.
(LDOUBLE_cacoshl_libm_version): Likewise.
(LDOUBLE_ccosl_libm_version): Likewise.
(LDOUBLE_ccoshl_libm_version): Likewise.
(LDOUBLE_casinl_libm_version): Likewise.
(LDOUBLE_csinl_libm_version): Likewise.
(LDOUBLE_casinhl_libm_version): Likewise.
(LDOUBLE_csinhl_libm_version): Likewise.
(LDOUBLE_catanl_libm_version): Likewise.
(LDOUBLE_catanhl_libm_version): Likewise.
(LDOUBLE_ctanl_libm_version): Likewise.
(LDOUBLE_ctanhl_libm_version): Likewise.
(LDOUBLE_cexpl_libm_version): Likewise.
(LDOUBLE_clogl_libm_version): Likewise.
(LDOUBLE_cprojl_libm_version): Likewise.
(LDOUBLE_csqrtl_libm_version): Likewise.
(LDOUBLE_cpowl_libm_version): Likewise.
(LDOUBLE_clog10l_libm_version): Likewise.
(LDOUBLE___clog10l_libm_version): Likewise.
(LDOUBLE_fdiml_libm_version): Likewise.
(LDOUBLE_fmaxl_libm_version): Likewise.
(LDOUBLE_fminl_libm_version): Likewise.
(LDOUBLE_ilogbl_libm_version): Likewise.
(LDOUBLE_nanl_libm_version): Likewise.
[!M_LIBM_NEED_COMPAT] (M_LIBM_NEED_COMPAT): Use
FIRST_VERSION_libm_* macros.
[!declare_mgen_libm_compat] (declare_mgen_libm_compat): Likewise.
* Makerules [$(build-shared) = yes && !avoid-generated]
(before-compile): Add $(common-objpfx)first-versions.h.
[$(build-shared) = yes && !avoid-generated]
($(common-objpfx)first-versions.h): New target.
($(common-objpfx)sysd-versions): Depend on and change to rule for
building $(common-objpfx)versions.stmp.
Ulrich Drepper <drepper@redhat.com>
* scripts/firstversion.awk: Use custom comparison function to compare
version numbers.
* scripts/versions.awk: Use sort invocation which can handle
multi-digit sub-version numbers.
Each version inherits from the last one only if they have the same
nonnumeric prefix, i.e. GLIBC_x.y and GLIBC_x.z or FOO_x and FOO_y
but not GLIBC_x and FOO_y.
* scripts/firstversions.awk: Handle libraries that don't have each
particular version named in the third column of shlib-versions.
supported version for libc 0.2.90.libio to GLIBC_2.2.
* Makeconfig (soversions.mk): Grok new third column in shlib-versions,
and use it to emit new variable `map-firstversions'.
* scripts/firstversions.awk: New file.
* Makerules (Versions.all): Use scripts/firstversions.awk and
the $(map-firstversions) value to generate a modified versions list
that includes renames in "A = B" syntax for each version set earlier
than the "earliest symbol version" named in shlib-versions.
* scripts/versions.awk: Recognize "A = B" lines in the input to mean
rename version set A to B in the output to the intermediate file.
* scripts/abi-versions.awk: New file.
* Makerules (abi-versions.h): New target, generated by that script.
[$(versioning) = yes] (before-compile): Prepend abi-versions.h.
* include/shlib-compat.h: New file, uses that generated header.
* scripts/versions.awk: Don't expect to read predecessor versions,
compute them.
* Versions.def: Remove predecessors. They get now computed.
1999-11-14 Ulrich Drepper <drepper@cygnus.com>
Patches by Franz Sirl <Franz.Sirl@lauterbach.com>.
1999-02-06 Ulrich Drepper <drepper@cygnus.com>
* Versions.def: Add versions for ld.so.
* csu/Versions: Remove __libc_stack_end here.
* elf/Versions: Split libc definitions in libc and ld.so definitions.
* elf/Makefile (ld-map): Change to ld.so.map.
* scripts/versions.awk: Recognize dot in library names.
* ctype/ctype.h: Remove definitions of __tolower and __toupper.
Don't use __tolower and __toupper in inline functions.
Add optimizing macros for tolower and toupper.
* ctype/ctype-extn.c (_tolower): Don't use __tolower.
(_toupper): Don't use __toupper.
* ctype/ctype.c (tolower): Don't use __tolower.
(toupper): Don't use toupper.
* nscd/cache.c (prune_cache): Correct printing of debugging messages.
* resolv/Versions (libresolv): Export __ns_name_unpack and
__ns_name_ntop.
* resolv/res_comp.c: Rename ns_name_unpack to __ns_name_unpack and
make it global. Change all users. Similar for ns_name_ntop.
* resolv/nss_dns/dns-host.c: Don't use dn_expand when extracting in
user-provided buffer. Use __ns_name_unpack and __ns_name_ntop
directly to detect too small buffer.
* stdio-common/Makefile (tests): Add scanf12.
* stdio-common/scanf12.c: New file.
* stdio-common/scanf12.input: New file.
* stdio-common/vfscanf.c (__vfscanf): Handle +/- at beginning of
floating-point correctly if the number is invalid.
* stdio-common/vfscanf.c: Don't use non-reentrant multibyte conversion
* stdio-common/printf_fphex.c: Likewise.
* stdio-common/vfprintf.c: Likewise.
See ChangeLog.9 for earlier changes.
