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18 lines
919 B
Diff
18 lines
919 B
Diff
https://git.altlinux.org/srpms/p/potrace.git?p=potrace.git;a=commitdiff;h=385f40d2d9827049f5f43f73d05e9fc7472e0da4
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https://bugs.gentoo.org/868465
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--- a/configure.ac
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+++ b/configure.ac
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@@ -251,9 +251,10 @@ AC_CHECK_FUNC(strncasecmp, ,
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dnl ----------------------------------------------------------------------
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dnl Check whether we have i386 features
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AC_MSG_CHECKING([for Intel 386])
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-AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[int x;
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- asm("bsf %1,%0\njnz 0f\nmovl $32,%0\n0:":"=r"(x):"r"(x));
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- return x; /* need this so that -O2 does not optimize the asm away */
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+AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[int x = 1;
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+ volatile asm("bsf %1,%0\njnz 0f\nmovl $32,%0\n0:":"=r"(x):"r"(x):"memory");
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+ /* volatile and "memory" clobber ensures '-O2 -flto' does not optimize the asm away */
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+ return x;
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]])],[AC_MSG_RESULT(yes)
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AC_DEFINE(HAVE_I386,, Can we use Intel 386 optimizations?)
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],[AC_MSG_RESULT(no)])
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