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48107fc8c4
libbsd/configure.ac
Guillem Jover e7cf8c5785 Switch md5 compatibility logic back to direct linking 
When using the recent dlsym() based wrapper, we are not requiring any
symbol from libmd, as we resolve those dynamically at run-time. We were
ending up linking against libmd because in another part of the code we
require (depending on the architecture) the SHA512 functions for the
getentropy() local implementation. But that function might be provided
by the system libc on some systems, which means we end up not linking
against libmd at all.

To solve this we go back to the previous simpler solution of linking
directly, which had the main drawback of then making programs fail to
link when not specifying -lmd (on platforms that need it). And then
switch the .so link point from a symlink to a linker script, so that we
can inject the -lmd library as-needed. This is similar to what glibc is
doing.

Fixes: commit 31f034e386
2021-12-01 04:14:35 +01:00

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# Process this file with autoconf to produce a configure script.
AC_PREREQ([2.67])
AC_INIT([libbsd], m4_esyscmd([./get-version]), [libbsd@lists.freedesktop.org])
AC_CONFIG_SRCDIR([src/strlcpy.c])
AC_CONFIG_AUX_DIR([build-aux])
AC_CONFIG_MACRO_DIR([m4])
AM_INIT_AUTOMAKE([1.9 foreign nostdinc subdir-objects no-dist-gzip dist-xz])
m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])],
[AC_SUBST([AM_DEFAULT_VERBOSITY], [1])])
LIBBSD_ABI_MAJOR=0
LIBBSD_ABI_MINOR=11
LIBBSD_ABI_PATCH=3
LIBBSD_ABI="$LIBBSD_ABI_MAJOR:$LIBBSD_ABI_MINOR:$LIBBSD_ABI_PATCH"
AC_SUBST([LIBBSD_ABI])
# Check and store if we got user supplied variables
user_CFLAGS=${CFLAGS-unset}
# Checks for operating system services and capabilities.
AC_USE_SYSTEM_EXTENSIONS
AC_SYS_LARGEFILE
LT_INIT
AC_CACHE_CHECK([if ld supports --version-script flag],
[libbsd_cv_version_script], [
echo "{ global: symbol; local: *; };" >conftest.map
save_LDFLAGS=$LDFLAGS
LDFLAGS="$LDFLAGS -Wl,--version-script=conftest.map"
AC_LINK_IFELSE([
AC_LANG_PROGRAM([], [])
], [
libbsd_cv_version_script=yes
], [
libbsd_cv_version_script=no
])
LDFLAGS="$save_LDFLAGS"
rm -f conftest.map
]
)
AM_CONDITIONAL([HAVE_LINKER_VERSION_SCRIPT],
[test "x$libbsd_cv_version_script" = "xyes"])
# Checks for programs.
AC_PROG_CC
AC_PROG_SED
AC_PROG_INSTALL
AC_PROG_LN_S
# Set default compiler variables
AS_IF([test "$user_CFLAGS" = unset], [
LIBBSD_CHECK_COMPILER_FLAG([-Wall])
LIBBSD_CHECK_COMPILER_FLAG([-Wextra])
LIBBSD_CHECK_COMPILER_FLAG([-Wbad-function-cast])
LIBBSD_CHECK_COMPILER_FLAG([-Wc99-c11-compat])
LIBBSD_CHECK_COMPILER_FLAG([-Wcast-align])
LIBBSD_CHECK_COMPILER_FLAG([-Wdeclaration-after-statement])
LIBBSD_CHECK_COMPILER_FLAG([-Wdocumentation])
LIBBSD_CHECK_COMPILER_FLAG([-Wduplicated-branches])
LIBBSD_CHECK_COMPILER_FLAG([-Wduplicated-cond])
LIBBSD_CHECK_COMPILER_FLAG([-Wformat -Wformat-security])
LIBBSD_CHECK_COMPILER_FLAG([-Wformat=2])
LIBBSD_CHECK_COMPILER_FLAG([-Winit-self])
LIBBSD_CHECK_COMPILER_FLAG([-Wlogical-not-parentheses])
LIBBSD_CHECK_COMPILER_FLAG([-Wlogical-op])
LIBBSD_CHECK_COMPILER_FLAG([-Wmissing-declarations])
LIBBSD_CHECK_COMPILER_FLAG([-Wmissing-format-attribute])
LIBBSD_CHECK_COMPILER_FLAG([-Wmissing-prototypes])
LIBBSD_CHECK_COMPILER_FLAG([-Wnested-externs])
LIBBSD_CHECK_COMPILER_FLAG([-Wno-missing-field-initializers])
LIBBSD_CHECK_COMPILER_FLAG([-Wno-nonnull-compare])
LIBBSD_CHECK_COMPILER_FLAG([-Wno-tautological-constant-out-of-range-compare])
LIBBSD_CHECK_COMPILER_FLAG([-Wno-unused-parameter])
LIBBSD_CHECK_COMPILER_FLAG([-Wnull-dereference])
LIBBSD_CHECK_COMPILER_FLAG([-Wold-style-definition])
LIBBSD_CHECK_COMPILER_FLAG([-Wpointer-arith])
LIBBSD_CHECK_COMPILER_FLAG([-Wregister])
LIBBSD_CHECK_COMPILER_FLAG([-Wrestrict])
LIBBSD_CHECK_COMPILER_FLAG([-Wshadow])
LIBBSD_CHECK_COMPILER_FLAG([-Wshift-negative-value])
LIBBSD_CHECK_COMPILER_FLAG([-Wsizeof-array-argument])
LIBBSD_CHECK_COMPILER_FLAG([-Wstrict-prototypes])
LIBBSD_CHECK_COMPILER_FLAG([-Wswitch-bool])
LIBBSD_CHECK_COMPILER_FLAG([-Wvla])
LIBBSD_CHECK_COMPILER_FLAG([-Wwrite-strings])
CFLAGS="$CFLAGS $LIBBSD_COMPILER_FLAGS"
])
# Checks for libraries.
AC_CHECK_LIB([testu01], [unif01_CreateExternGenBits],
[TESTU01_LIBS="-ltestu01"])
AC_SUBST([TESTU01_LIBS])
AM_CONDITIONAL([HAVE_LIBTESTU01],
[test "x$ac_cv_lib_testu01_unif01_CreateExternGenBits" = "xyes"])
saved_LIBS="$LIBS"
AC_SEARCH_LIBS([MD5Update], [md], [
AS_IF([test "x$ac_cv_search_MD5Update" != "xnone required"], [
MD5_LIBS="$MD5_LIBS $ac_cv_search_MD5Update"
need_transparent_libmd=yes
])
], [
AC_MSG_ERROR([cannot find required MD5 functions in libc or libmd])
])
AC_SEARCH_LIBS([SHA512Update], [md], [
AS_IF([test "x$ac_cv_search_SHA512Update" != "xnone required"], [
LIBBSD_LIBS="$LIBBSD_LIBS $ac_cv_search_SHA512Update"
])
], [
AC_MSG_ERROR([cannot find required SHA-2 functions in libc or libmd])
])
LIBS="$saved_LIBS"
AM_CONDITIONAL([NEED_TRANSPARENT_LIBMD],
[test "x$need_transparent_libmd" = "xyes"])
is_windows=no
AS_CASE([$host_os],
[*-gnu*], [
# In old glibc versions (< 2.17) clock_gettime() is in librt.
saved_LIBS="$LIBS"
AC_SEARCH_LIBS([clock_gettime], [rt], [
AS_IF([test "x$ac_cv_search_clock_gettime" != "xnone required"], [
LIBBSD_LIBS="$LIBBSD_LIBS $ac_cv_search_clock_gettime"
])
])
LIBS="$saved_LIBS"
],
[*-musl*], [
# Upstream refuses to define this, we will do it ourselves then.
AC_DEFINE([__MUSL__], [1], [Define to 1 if we are building for musl])
],
[mingw*], [
is_windows=yes
],
)
AM_CONDITIONAL([OS_WINDOWS], [test "x$is_windows" = "xyes"])
# Checks for header files.
AC_CHECK_HEADERS([sys/ndir.h sys/dir.h ndir.h dirent.h pwd.h grp.h])
# Checks for typedefs, structures, and compiler characteristics.
AC_C_INLINE
AC_C_TYPEOF
AC_TYPE_INT64_T
AC_TYPE_MODE_T
AC_TYPE_OFF_T
AC_TYPE_PID_T
AC_TYPE_UID_T
AC_TYPE_SIZE_T
AC_TYPE_SSIZE_T
AC_CHECK_DECL([F_CLOSEM],
[AC_DEFINE([HAVE_FCNTL_CLOSEM], [1],
[Define to 1 if you have fcntl(F_CLOSEM)])],
[],
[#include <limits.h>
#include <fcntl.h>])
AC_CACHE_CHECK(
[for GNU .init_array section support],
[libbsd_cv_gnu_init_array_support],
[AC_RUN_IFELSE(
[AC_LANG_SOURCE(
[[
static int rc = 1;
static void init(int argc) { if (argc == 1) rc = 0; }
void (*init_func)(int argc) __attribute__((__section__(".init_array"), __used__)) = init;
int main() { return rc; }
]]
)],
[libbsd_cv_gnu_init_array_support=yes],
[libbsd_cv_gnu_init_array_support=no],
[AC_PREPROC_IFELSE(
[AC_LANG_SOURCE(
[[
/* Look for a known libc that supports .init_array with the GNU extension
* to pass main() arguments to the init functions. */
#include <stdlib.h>
#if defined __GLIBC_PREREQ
# if __GLIBC_PREREQ(2, 4)
/* glibc supports GNU .init_array since 2.4. */
# else
# error glibc does not support GNU .init_array
# endif
#else
/*
* Basic SysV ABI .init_array support, init functions do not get arguments:
* - Bionic since its inception.
* - uClibc since 0.9.29.
*/
# error unknown whether libc supports GNU .init_array
#endif
]]
)],
[libbsd_cv_gnu_init_array_support=yes],
[libbsd_cv_gnu_init_array_support=no])
]
)]
)
AM_CONDITIONAL([BUILD_LIBBSD_CTOR],
[test "$libbsd_cv_gnu_init_array_support" = yes])
# Checks for library functions.
AC_MSG_CHECKING([for program_invocation_short_name])
AC_LINK_IFELSE(
[AC_LANG_PROGRAM([[#include <errno.h>]],
[[const char *p = program_invocation_short_name;]])],
[AC_DEFINE([HAVE_PROGRAM_INVOCATION_SHORT_NAME], [1],
[Define to 1 if you have program_invocation_short_name])
AC_MSG_RESULT([yes])],
[AC_MSG_RESULT([no])])
AC_MSG_CHECKING([for __progname])
AC_LINK_IFELSE(
[AC_LANG_PROGRAM([[extern char *__progname;]],
[[printf("%s", __progname);]])],
[AC_DEFINE([HAVE___PROGNAME], [1], [Define to 1 if you have __progname])
AC_MSG_RESULT([yes])],
[AC_MSG_RESULT([no])])
AC_MSG_CHECKING([for __register_atfork])
AC_LINK_IFELSE(
[AC_LANG_PROGRAM([[
#include <stddef.h>
extern void *__dso_handle;
extern int __register_atfork(void (*)(void), void(*)(void), void (*)(void), void *);
]], [[
__register_atfork(NULL, NULL, NULL, __dso_handle);
]])],
[AC_DEFINE([HAVE___REGISTER_ATFORK], [1],
[Define to 1 if you have __register_atfork])
AC_MSG_RESULT([yes])],
[LIBBSD_LIBS="$LIBBSD_LIBS -pthread"
AC_MSG_RESULT([no])
])
AC_CHECK_FUNCS([clearenv dirfd fopencookie __fpurge \
getauxval getentropy getexecname getline \
pstat_getproc sysconf])
AM_CONDITIONAL([HAVE_GETENTROPY], [test "x$ac_cv_func_getentropy" = "xtrue"])
AC_SUBST([MD5_LIBS])
AC_SUBST([LIBBSD_LIBS])
AC_CONFIG_FILES([
Makefile
include/Makefile
man/Makefile
src/Makefile
src/libbsd.pc
src/libbsd-ctor.pc
src/libbsd-overlay.pc
test/Makefile
])
AC_CONFIG_HEADERS([config.h])
AC_OUTPUT
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