mirror of https://github.com/nirenjan/libx52.git
Revert "Enable compiling libx52 with weak symbol binding"
The hope was that I could compile some tests that would override libx52_vendor_command, and run those on OSX to bypass the skipped tests that used x52cli. However, a Travis-CI run indicated that the compiler on OSX doesn't support weak symbols, which renders the point moot.pull/22/head
parent
5b7afa6ae1
commit
4f22983739
10
configure.ac
10
configure.ac
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@ -64,16 +64,6 @@ AM_COND_IF([HAVE_DOXYGEN],
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# Configuration headers
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AC_CONFIG_HEADERS([config.h])
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# Weak symbol support
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# By default, libx52 is compiled with weak symbols, allowing certain functions
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# to be overridden by the application, if necessary. However, you can get away
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# with disabling the weak symbols, which will also disable some of the checks.
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AC_ARG_ENABLE([weak_symbols],
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AS_HELP_STRING([--disable-weak-symbols],
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[Disable weak symbols during compilation]))
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AM_CONDITIONAL([USE_WEAK_SYMBOLS], [test "x$enable_weak_symbols" != "xno"])
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AM_COND_IF([USE_WEAK_SYMBOLS], [AX_SYS_WEAK_ALIAS])
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AC_CONFIG_FILES([ po/Makefile.in
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Makefile
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lib/Makefile
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@ -66,15 +66,7 @@ int _x52_translate_libusb_error(enum libusb_error errcode)
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};
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}
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#if defined HAVE_SYS_WEAK_ALIAS
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#if defined HAVE_SYS_WEAK_ALIAS_PRAGMA
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#pragma weak libx52_vendor_command = _x52_vendor_command
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#endif
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int _x52_vendor_command
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#else
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int libx52_vendor_command
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#endif
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(libx52_device *x52, uint16_t index, uint16_t value)
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int libx52_vendor_command(libx52_device *x52, uint16_t index, uint16_t value)
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{
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int j;
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int rc = 0;
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@ -99,12 +91,6 @@ int libx52_vendor_command
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return _x52_translate_libusb_error(rc);
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}
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#if defined HAVE_SYS_WEAK_ALIAS
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#if defined HAVE_SYS_WEAK_ALIAS_ATTRIBUTE
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int libx52_vendor_command(libx52_device *x52, uint16_t index, uint16_t value)
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__attribute__((weak, alias("_x52_vendor_command")));
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#endif
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#endif
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static int _x52_write_line(libx52_device *x52, uint8_t line_index)
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{
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@ -1,337 +0,0 @@
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# ===========================================================================
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# https://www.gnu.org/software/autoconf-archive/ax_sys_weak_alias.html
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# ===========================================================================
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#
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# SYNOPSIS
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#
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# AX_SYS_WEAK_ALIAS
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#
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# DESCRIPTION
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#
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# Determines whether weak aliases are supported on the system, and if so,
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# what scheme is used to declare them. Also checks to see if aliases can
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# cross object file boundaries, as some systems don't permit them to.
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#
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# Most systems permit something called a "weak alias" or "weak symbol."
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# These aliases permit a library to provide a stub form of a routine
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# defined in another library, thus allowing the first library to operate
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# even if the other library is not linked. This macro will check for
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# support of weak aliases, figure out what schemes are available, and
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# determine some characteristics of the weak alias support -- primarily,
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# whether a weak alias declared in one object file may be referenced from
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# another object file.
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#
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# There are four known schemes of declaring weak symbols; each scheme is
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# checked in turn, and the first one found is preferred. Note that only
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# one of the mentioned preprocessor macros will be defined!
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#
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# 1. Function attributes
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#
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# This scheme was first introduced by the GNU C compiler, and attaches
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# attributes to particular functions. It is among the easiest to use, and
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# so is the first one checked. If this scheme is detected, the
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# preprocessor macro HAVE_SYS_WEAK_ALIAS_ATTRIBUTE will be defined to 1.
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# This scheme is used as in the following code fragment:
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#
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# void __weakf(int c)
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# {
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# /* Function definition... */
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# }
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#
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# void weakf(int c) __attribute__((weak, alias("__weakf")));
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#
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# 2. #pragma weak
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#
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# This scheme is in use by many compilers other than the GNU C compiler.
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# It is also particularly easy to use, and fairly portable -- well, as
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# portable as these things get. If this scheme is detected first, the
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# preprocessor macro HAVE_SYS_WEAK_ALIAS_PRAGMA will be defined to 1. This
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# scheme is used as in the following code fragment:
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#
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# extern void weakf(int c);
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# #pragma weak weakf = __weakf
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# void __weakf(int c)
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# {
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# /* Function definition... */
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# }
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#
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# 3. #pragma _HP_SECONDARY_DEF
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#
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# This scheme appears to be in use by the HP compiler. As it is rather
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# specialized, this is one of the last schemes checked. If it is the first
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# one detected, the preprocessor macro HAVE_SYS_WEAK_ALIAS_HPSECONDARY
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# will be defined to 1. This scheme is used as in the following code
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# fragment:
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#
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# extern void weakf(int c);
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# #pragma _HP_SECONDARY_DEF __weakf weakf
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# void __weakf(int c)
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# {
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# /* Function definition... */
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# }
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#
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# 4. #pragma _CRI duplicate
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#
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# This scheme appears to be in use by the Cray compiler. As it is rather
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# specialized, it too is one of the last schemes checked. If it is the
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# first one detected, the preprocessor macro
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# HAVE_SYS_WEAK_ALIAS_CRIDUPLICATE will be defined to 1. This scheme is
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# used as in the following code fragment:
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#
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# extern void weakf(int c);
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# #pragma _CRI duplicate weakf as __weakf
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# void __weakf(int c)
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# {
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# /* Function definition... */
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# }
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#
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# In addition to the preprocessor macros listed above, if any scheme is
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# found, the preprocessor macro HAVE_SYS_WEAK_ALIAS will also be defined
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# to 1.
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#
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# Once a weak aliasing scheme has been found, a check will be performed to
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# see if weak aliases are honored across object file boundaries. If they
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# are, the HAVE_SYS_WEAK_ALIAS_CROSSFILE preprocessor macro is defined to
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# 1.
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#
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# This Autoconf macro also makes two substitutions. The first, WEAK_ALIAS,
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# contains the name of the scheme found (one of "attribute", "pragma",
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# "hpsecondary", or "criduplicate"), or "no" if no weak aliasing scheme
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# was found. The second, WEAK_ALIAS_CROSSFILE, is set to "yes" or "no"
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# depending on whether or not weak aliases may cross object file
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# boundaries.
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#
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# LICENSE
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#
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# Copyright (c) 2008 Kevin L. Mitchell <klmitch@mit.edu>
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#
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# Copying and distribution of this file, with or without modification, are
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# permitted in any medium without royalty provided the copyright notice
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# and this notice are preserved. This file is offered as-is, without any
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# warranty.
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#serial 8
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AU_ALIAS([KLM_SYS_WEAK_ALIAS], [AX_SYS_WEAK_ALIAS])
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AC_DEFUN([AX_SYS_WEAK_ALIAS], [
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# starting point: no aliasing scheme yet...
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ax_sys_weak_alias=no
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# Figure out what kind of aliasing may be supported...
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_AX_SYS_WEAK_ALIAS_ATTRIBUTE
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_AX_SYS_WEAK_ALIAS_PRAGMA
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_AX_SYS_WEAK_ALIAS_HPSECONDARY
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_AX_SYS_WEAK_ALIAS_CRIDUPLICATE
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# Do we actually support aliasing?
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AC_CACHE_CHECK([how to create weak aliases with $CC],
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[ax_cv_sys_weak_alias],
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[ax_cv_sys_weak_alias=$ax_sys_weak_alias])
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# OK, set a #define
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AS_IF([test $ax_cv_sys_weak_alias != no], [
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AC_DEFINE([HAVE_SYS_WEAK_ALIAS], 1,
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[Define this if your system can create weak aliases])
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])
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# Can aliases cross object file boundaries?
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_AX_SYS_WEAK_ALIAS_CROSSFILE
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# OK, remember the results
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AC_SUBST([WEAK_ALIAS], [$ax_cv_sys_weak_alias])
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AC_SUBST([WEAK_ALIAS_CROSSFILE], [$ax_cv_sys_weak_alias_crossfile])
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])
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AC_DEFUN([_AX_SYS_WEAK_ALIAS_ATTRIBUTE],
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[ # Test whether compiler accepts __attribute__ form of weak aliasing
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AC_CACHE_CHECK([whether $CC accepts function __attribute__((weak,alias()))],
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[ax_cv_sys_weak_alias_attribute], [
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# We add -Werror if it's gcc to force an error exit if the weak attribute
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# isn't understood
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AS_IF([test $GCC = yes], [
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save_CFLAGS=$CFLAGS
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CFLAGS=-Werror])
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# Try linking with a weak alias...
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AC_LINK_IFELSE([
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AC_LANG_PROGRAM([
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void __weakf(int c) {}
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void weakf(int c) __attribute__((weak, alias("__weakf")));],
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[weakf(0)])],
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[ax_cv_sys_weak_alias_attribute=yes],
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[ax_cv_sys_weak_alias_attribute=no])
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# Restore original CFLAGS
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AS_IF([test $GCC = yes], [
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CFLAGS=$save_CFLAGS])
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])
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# What was the result of the test?
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AS_IF([test $ax_sys_weak_alias = no &&
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test $ax_cv_sys_weak_alias_attribute = yes], [
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ax_sys_weak_alias=attribute
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AC_DEFINE([HAVE_SYS_WEAK_ALIAS_ATTRIBUTE], 1,
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[Define this if weak aliases may be created with __attribute__])
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])
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])
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AC_DEFUN([_AX_SYS_WEAK_ALIAS_PRAGMA],
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[ # Test whether compiler accepts #pragma form of weak aliasing
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AC_CACHE_CHECK([whether $CC supports @%:@pragma weak],
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[ax_cv_sys_weak_alias_pragma], [
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# Try linking with a weak alias...
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AC_LINK_IFELSE([
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AC_LANG_PROGRAM([
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extern void weakf(int c);
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@%:@pragma weak weakf = __weakf
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void __weakf(int c) {}],
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[weakf(0)])],
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[ax_cv_sys_weak_alias_pragma=yes],
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[ax_cv_sys_weak_alias_pragma=no])
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])
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# What was the result of the test?
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AS_IF([test $ax_sys_weak_alias = no &&
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test $ax_cv_sys_weak_alias_pragma = yes], [
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ax_sys_weak_alias=pragma
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AC_DEFINE([HAVE_SYS_WEAK_ALIAS_PRAGMA], 1,
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[Define this if weak aliases may be created with @%:@pragma weak])
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])
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])
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AC_DEFUN([_AX_SYS_WEAK_ALIAS_HPSECONDARY],
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[ # Test whether compiler accepts _HP_SECONDARY_DEF pragma from HP...
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AC_CACHE_CHECK([whether $CC supports @%:@pragma _HP_SECONDARY_DEF],
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[ax_cv_sys_weak_alias_hpsecondary], [
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# Try linking with a weak alias...
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AC_LINK_IFELSE([
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AC_LANG_PROGRAM([
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extern void weakf(int c);
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@%:@pragma _HP_SECONDARY_DEF __weakf weakf
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void __weakf(int c) {}],
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[weakf(0)])],
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[ax_cv_sys_weak_alias_hpsecondary=yes],
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[ax_cv_sys_weak_alias_hpsecondary=no])
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])
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# What was the result of the test?
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AS_IF([test $ax_sys_weak_alias = no &&
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test $ax_cv_sys_weak_alias_hpsecondary = yes], [
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ax_sys_weak_alias=hpsecondary
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AC_DEFINE([HAVE_SYS_WEAK_ALIAS_HPSECONDARY], 1,
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[Define this if weak aliases may be created with @%:@pragma _HP_SECONDARY_DEF])
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])
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])
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AC_DEFUN([_AX_SYS_WEAK_ALIAS_CRIDUPLICATE],
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[ # Test whether compiler accepts "_CRI duplicate" pragma from Cray
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AC_CACHE_CHECK([whether $CC supports @%:@pragma _CRI duplicate],
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[ax_cv_sys_weak_alias_criduplicate], [
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# Try linking with a weak alias...
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AC_LINK_IFELSE([
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AC_LANG_PROGRAM([
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extern void weakf(int c);
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@%:@pragma _CRI duplicate weakf as __weakf
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void __weakf(int c) {}],
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[weakf(0)])],
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[ax_cv_sys_weak_alias_criduplicate=yes],
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[ax_cv_sys_weak_alias_criduplicate=no])
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])
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# What was the result of the test?
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AS_IF([test $ax_sys_weak_alias = no &&
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test $ax_cv_sys_weak_alias_criduplicate = yes], [
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ax_sys_weak_alias=criduplicate
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AC_DEFINE([HAVE_SYS_WEAK_ALIAS_CRIDUPLICATE], 1,
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[Define this if weak aliases may be created with @%:@pragma _CRI duplicate])
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])
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])
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dnl Note: This macro is modeled closely on AC_LINK_IFELSE, and in fact
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dnl depends on some implementation details of that macro, particularly
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dnl its use of _AC_MSG_LOG_CONFTEST to log the failed test program and
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dnl its use of ac_link for running the linker.
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AC_DEFUN([_AX_SYS_WEAK_ALIAS_CROSSFILE],
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[ # Check to see if weak aliases can cross object file boundaries
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AC_CACHE_CHECK([whether $CC supports weak aliases across object file boundaries],
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[ax_cv_sys_weak_alias_crossfile], [
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AS_IF([test $ax_cv_sys_weak_alias = no],
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[ax_cv_sys_weak_alias_crossfile=no], [
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dnl Must build our own test files...
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# conftest1 contains our weak alias definition...
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cat >conftest1.$ac_ext <<_ACEOF
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/* confdefs.h. */
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_ACEOF
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cat confdefs.h >>conftest1.$ac_ext
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cat >>conftest1.$ac_ext <<_ACEOF
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/* end confdefs.h. */
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@%:@ifndef HAVE_SYS_WEAK_ALIAS_ATTRIBUTE
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extern void weakf(int c);
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@%:@endif
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@%:@if defined(HAVE_SYS_WEAK_ALIAS_PRAGMA)
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@%:@pragma weak weakf = __weakf
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@%:@elif defined(HAVE_SYS_WEAK_ALIAS_HPSECONDARY)
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@%:@pragma _HP_SECONDARY_DEF __weakf weakf
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@%:@elif defined(HAVE_SYS_WEAK_ALIAS_CRIDUPLICATE)
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@%:@pragma _CRI duplicate weakf as __weakf
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@%:@endif
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void __weakf(int c) {}
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@%:@ifdef HAVE_SYS_WEAK_ALIAS_ATTRIBUTE
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void weakf(int c) __attribute((weak, alias("__weakf")));
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@%:@endif
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_ACEOF
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# And conftest2 contains our main routine that calls it
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cat >conftest2.$ac_ext <<_ACEOF
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/* confdefs.h. */
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_ACEOF
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cat confdefs.h >> conftest2.$ac_ext
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cat >>conftest2.$ac_ext <<_ACEOF
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/* end confdefs.h. */
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extern void weakf(int c);
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int
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main ()
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{
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weakf(0);
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return 0;
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}
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_ACEOF
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# We must remove the object files (if any) ourselves...
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rm -f conftest2.$ac_objext conftest$ac_exeext
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# Change ac_link to compile *2* files together
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save_aclink=$ac_link
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ac_link=`echo "$ac_link" | \
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sed -e 's/conftest\(\.\$ac_ext\)/conftest1\1 conftest2\1/'`
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dnl Substitute our own routine for logging the conftest
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m4_pushdef([_AC_MSG_LOG_CONFTEST],
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[echo "$as_me: failed program was:" >&AS_MESSAGE_LOG_FD
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echo ">>> conftest1.$ac_ext" >&AS_MESSAGE_LOG_FD
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sed "s/^/| /" conftest1.$ac_ext >&AS_MESSAGE_LOG_FD
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echo ">>> conftest2.$ac_ext" >&AS_MESSAGE_LOG_FD
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sed "s/^/| /" conftest2.$ac_ext >&AS_MESSAGE_LOG_FD
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])dnl
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# Since we created the files ourselves, don't use SOURCE argument
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AC_LINK_IFELSE(, [ax_cv_sys_weak_alias_crossfile=yes],
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[ax_cv_sys_weak_alias_crossfile=no])
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dnl Restore _AC_MSG_LOG_CONFTEST
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m4_popdef([_AC_MSG_LOG_CONFTEST])dnl
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# Restore ac_link
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ac_link=$save_aclink
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# We must remove the object files (if any) and C files ourselves...
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rm -f conftest1.$ac_ext conftest2.$ac_ext \
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conftest1.$ac_objext conftest2.$ac_objext
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])
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])
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# What were the results of the test?
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AS_IF([test $ax_cv_sys_weak_alias_crossfile = yes], [
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AC_DEFINE([HAVE_SYS_WEAK_ALIAS_CROSSFILE], 1,
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[Define this if weak aliases in other files are honored])
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])
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])
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Reference in New Issue