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| author | Joseph Myers <joseph@codesourcery.com> | 2017-05-19 11:26:00 +0000 |
|---|---|---|
| committer | Joseph Myers <joseph@codesourcery.com> | 2017-05-19 11:26:00 +0000 |
| commit | 8f2e1830f298f45d34cfdb4cffc8ce3b940a3990 (patch) | |
| tree | 2ef1718177270ba6b5d846641a49cbf79c0225c3 /Makerules | |
| parent | 332e01c6276e05ece5953007c98aa84725c4fda4 (diff) | |
| download | glibc-8f2e1830f298f45d34cfdb4cffc8ce3b940a3990.tar.gz | |
Create and use first-versions.h with macros for function symbol versions.
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.
Diffstat (limited to 'Makerules')
| -rw-r--r-- | Makerules | 13 |
1 files changed, 10 insertions, 3 deletions
@@ -105,6 +105,11 @@ $(common-objpfx)%.latest: $(common-objpfx)abi-versions.h sed -n '/ VERSION_$*_/{s/^.*_\([A-Z0-9_]*\).*$$/\1/;h;};$${g;p;}' \ $(common-objpfx)abi-versions.h > $@T mv -f $@T $@ + +# first-versions.h provides macros used in various symbol versioning +# macro calls. +before-compile := $(common-objpfx)first-versions.h $(before-compile) +$(common-objpfx)first-versions.h: $(common-objpfx)versions.stmp endif # avoid-generated endif # $(build-shared) = yes @@ -458,7 +463,8 @@ $(common-objpfx)Versions.all: $(..)scripts/firstversions.awk \ $(common-objpfx)Versions.v.i: $(wildcard $(subdirs:%=$(..)%/Versions)) \ $(wildcard $(sysdirs:%=%/Versions)) \ $(sysd-versions-force) -$(common-objpfx)sysd-versions: $(common-objpfx)Versions.all \ +$(common-objpfx)sysd-versions: $(common-objpfx)versions.stmp +$(common-objpfx)versions.stmp: $(common-objpfx)Versions.all \ $(common-objpfx)Versions.v \ $(..)scripts/versions.awk ( echo 'sysd-versions-subdirs = $(subdirs) $(config-sysdirs)' ; \ @@ -466,8 +472,9 @@ $(common-objpfx)sysd-versions: $(common-objpfx)Versions.all \ | LC_ALL=C $(AWK) -v buildroot=$(common-objpfx) -v defsfile=$< \ -v move_if_change='$(move-if-change)' \ -f $(word 3,$^); \ - ) > $@T - mv -f $@T $@ + ) > $(common-objpfx)sysd-versionsT + mv -f $(common-objpfx)sysd-versionsT $(common-objpfx)sysd-versions + touch $@ endif # avoid-generated endif # $(build-shared) = yes endif # sysd-sorted-done |