3bc2f570ec
Weak symbols were a nice idea, but they turned out not to be a good one. Toolchain support is just too sparse, in particular llvm-gcc is totally broken. This patch uses a surprisingly low-tech approach: a static library. Symbols in a static library are always overridden by symbols in an object file. Furthermore, if you place each function in a separate source file, object files for unused functions will not be taken in. This means that each function can use all the dependencies that it needs (especially QAPI stuff such as error_setg). Thus, all stubs are placed in separate object files and put together in a static library. The library then is linked to all programs. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Tested-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Tested-by: Stefan Weil <sw@weilnetz.de> Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
59 lines
1.8 KiB
C
59 lines
1.8 KiB
C
/* public domain */
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#ifndef COMPILER_H
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#define COMPILER_H
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#include "config-host.h"
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/*----------------------------------------------------------------------------
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| The macro QEMU_GNUC_PREREQ tests for minimum version of the GNU C compiler.
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| The code is a copy of SOFTFLOAT_GNUC_PREREQ, see softfloat-macros.h.
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*----------------------------------------------------------------------------*/
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#if defined(__GNUC__) && defined(__GNUC_MINOR__)
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# define QEMU_GNUC_PREREQ(maj, min) \
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((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
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#else
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# define QEMU_GNUC_PREREQ(maj, min) 0
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#endif
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#define QEMU_NORETURN __attribute__ ((__noreturn__))
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#if QEMU_GNUC_PREREQ(3, 4)
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#define QEMU_WARN_UNUSED_RESULT __attribute__((warn_unused_result))
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#else
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#define QEMU_WARN_UNUSED_RESULT
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#endif
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#if defined(_WIN32)
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# define QEMU_PACKED __attribute__((gcc_struct, packed))
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#else
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# define QEMU_PACKED __attribute__((packed))
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#endif
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#define cat(x,y) x ## y
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#define cat2(x,y) cat(x,y)
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#define QEMU_BUILD_BUG_ON(x) \
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typedef char cat2(qemu_build_bug_on__,__LINE__)[(x)?-1:1];
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#if defined __GNUC__
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# if !QEMU_GNUC_PREREQ(4, 4)
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/* gcc versions before 4.4.x don't support gnu_printf, so use printf. */
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# define GCC_ATTR __attribute__((__unused__, format(printf, 1, 2)))
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# define GCC_FMT_ATTR(n, m) __attribute__((format(printf, n, m)))
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# else
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/* Use gnu_printf when supported (qemu uses standard format strings). */
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# define GCC_ATTR __attribute__((__unused__, format(gnu_printf, 1, 2)))
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# define GCC_FMT_ATTR(n, m) __attribute__((format(gnu_printf, n, m)))
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# if defined(_WIN32)
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/* Map __printf__ to __gnu_printf__ because we want standard format strings
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* even when MinGW or GLib include files use __printf__. */
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# define __printf__ __gnu_printf__
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# endif
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# endif
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#else
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#define GCC_ATTR /**/
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#define GCC_FMT_ATTR(n, m)
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#endif
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#endif /* COMPILER_H */
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