e2239af353
Improve the commentary to aid future developers who will stumble upon this novel, yet not always perfect, mechanism to support alternative formats for long double. Likewise, rename __LONG_DOUBLE_USES_FLOAT128 to __LDOUBLE_REDIRECTS_TO_FLOAT128_ABI now that development work has settled down. The command used was git grep -l __LONG_DOUBLE_USES_FLOAT128 ':!./ChangeLog*' | \ xargs sed -i 's/__LONG_DOUBLE_USES_FLOAT128/__LDOUBLE_REDIRECTS_TO_FLOAT128_ABI/g' Reviewed-by: Tulio Magno Quites Machado Filho <tuliom@linux.ibm.com>
37 lines
1,009 B
C
37 lines
1,009 B
C
#include <dlfcn.h>
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#include <stdio.h>
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#include <string.h>
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static int
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do_test (void)
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{
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Dl_info i;
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if (dladdr (&printf, &i) == 0)
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{
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puts ("not found");
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return 1;
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}
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printf ("found symbol %s in %s\n", i.dli_sname, i.dli_fname);
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if (i.dli_sname == NULL)
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return 1;
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#if __LDOUBLE_REDIRECTS_TO_FLOAT128_ABI == 1
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/* On architectures which redirect long double to
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_Float128 (e.g powerpc64le), printf will resolve
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to __printfieee128 due to header redirects. There
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is no _IO_printfieee128 alias. */
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return strcmp (i.dli_sname, "__printfieee128") != 0;
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#else
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return i.dli_sname == NULL
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|| (strcmp (i.dli_sname, "printf") != 0
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/* On architectures which create PIC code by default
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&printf may resolve to an address in libc.so
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rather than in the binary. printf and _IO_printf
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are aliased and which one comes first in the
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hash table is up to the linker. */
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&& strcmp (i.dli_sname, "_IO_printf") != 0);
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#endif
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}
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#include <support/test-driver.c>
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