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cmd/ld: don't delete output binary if not "ordinary" file.
e.g., don't delete /dev/null. this fix inspired by gnu libiberty, unlink-if-ordinary.c. Fixes #7563 LGTM=iant R=golang-codereviews, iant, 0intro CC=golang-codereviews, r https://golang.org/cl/76810045
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@ -37,6 +37,9 @@
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#include "../../pkg/runtime/funcdata.h"
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#include <ar.h>
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#if !(defined(_WIN32) || defined(PLAN9))
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#include <sys/stat.h>
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#endif
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enum
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{
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@ -106,8 +109,13 @@ libinit(void)
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// Unix doesn't like it when we write to a running (or, sometimes,
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// recently run) binary, so remove the output file before writing it.
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// On Windows 7, remove() can force the following create() to fail.
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#ifndef _WIN32
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remove(outfile);
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// S_ISREG() does not exist on Plan 9.
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#if !(defined(_WIN32) || defined(PLAN9))
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{
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struct stat st;
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if(lstat(outfile, &st) == 0 && S_ISREG(st.st_mode))
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remove(outfile);
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}
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#endif
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cout = create(outfile, 1, 0775);
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if(cout < 0) {
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