[Bug 4694] New: "Invalid content of \{\}" error on regcomp('^\#define[[:space:]]\{1\,\}BOOT_TRAMPOLINE[[:space:]]\{1\,\}',0)

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=4694

           Summary: "Invalid content of \{\}" error on
                    regcomp('^\#define[[:space:]]\{1\,\}BOOT_TRAMPOLINE[[:
                    space:]]\{1\,\}',0)
           Product: uClibc
           Version: unspecified
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: minor
          Priority: P5
         Component: Standard Compliance
        AssignedTo: unassigned at uclibc.org
        ReportedBy: vda.linux at googlemail.com
                CC: uclibc-cvs at uclibc.org
   Estimated Hours: 0.0


When built aqgainst uclibc,

busybox sed 's,^\#define[[:space:]]\{1\,\}BOOT_TRAMPOLINE[[:space:]]\{1\,\},,p'

fails with "Invalid content of \{\}" message.
When the very same tree is build against glibc, it works.

On the library call level, it boils down to this call (the string has \ -> \\
escaped again by me, compiler will strip them back to single \):

regcomp(&regex,
"^\\#define[[:space:]]\\{1\\,\\}BOOT_TRAMPOLINE[[:space:]]\\{1\\,\\}", 0);

which fails; regerror() reports "Invalid content of \{\}".

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