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authorJoseph Myers <joseph@codesourcery.com>2017-05-19 11:26:00 +0000
committerJoseph Myers <joseph@codesourcery.com>2017-05-19 11:26:00 +0000
commit8f2e1830f298f45d34cfdb4cffc8ce3b940a3990 (patch)
tree2ef1718177270ba6b5d846641a49cbf79c0225c3 /scripts
parent332e01c6276e05ece5953007c98aa84725c4fda4 (diff)
downloadglibc-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 'scripts')
-rw-r--r--scripts/versions.awk17
1 files changed, 17 insertions, 0 deletions
diff --git a/scripts/versions.awk b/scripts/versions.awk
index df33529e59..df08d06816 100644
--- a/scripts/versions.awk
+++ b/scripts/versions.awk
@@ -101,6 +101,10 @@ END {
oldlib = "";
oldver = "";
+ real_first_ver_header = buildroot "first-versions.h"
+ first_ver_header = real_first_ver_header "T"
+ printf("#ifndef _FIRST_VERSIONS_H\n") > first_ver_header;
+ printf("#define _FIRST_VERSIONS_H\n") > first_ver_header;
printf("version-maps =");
while (getline < tmpfile) {
if ($1 != oldlib) {
@@ -127,11 +131,24 @@ END {
printf(" ") > outfile;
for (n = 3; n <= NF; ++n) {
printf(" %s", $n) > outfile;
+ sym = $n;
+ sub(";", "", sym);
+ first_ver_macro = "FIRST_VERSION_" oldlib "_" sym;
+ if (!(first_ver_macro in first_ver_seen) \
+ && oldver ~ "^GLIBC_[0-9]" \
+ && sym ~ "^[A-Za-z0-9_]*$") {
+ ver_val = oldver;
+ gsub("\\.", "_", ver_val);
+ printf("#define %s %s\n", first_ver_macro, ver_val) > first_ver_header;
+ first_ver_seen[first_ver_macro] = 1;
+ }
}
printf("\n") > outfile;
}
printf("\n");
+ printf("#endif /* first-versions.h */\n") > first_ver_header;
closeversion(oldver, veryoldver);
close_and_move(outfile, real_outfile);
+ close_and_move(first_ver_header, real_first_ver_header);
#system("rm -f " tmpfile);
}